Pressure relief piece and battery pack

Abstract

The utility model provides a pressure relief piece and a battery pack, the pressure relief piece is provided with a pressure relief channel as well as a pressure relief opening and an air outlet which are respectively communicated with the pressure relief channel, the pressure relief opening is arranged corresponding to an explosion-proof valve of a battery cell, and the pressure relief opening is used for enabling gas ejected from the explosion-proof valve to flow into the pressure relief channel and to be discharged from the air outlet; wherein the projection part, in the thickness direction of the pressure relief piece, of the cap of the battery cell is located outside the pressure relief opening, the width of the pressure relief opening is L1, the diameter of the anti-explosion valve of the battery cell is R1, and L1 is larger than or equal to 1 / 2R1 and smaller than or equal to R1. By applying the technical scheme of the utility model, the technical problem of short circuit of the battery pack caused by easy ejection of the cap in the prior art can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a pressure relief component and a battery pack. Background Technology

[0002] In battery pack applications, pressure relief plates are typically installed to release pressure in the event of thermal runaway of the battery cells. These plates contain pressure relief channels with vents. The explosion-proof valves of the battery cells are aligned with these vents for venting and releasing pressure. However, during the pressure relief process, excessive internal pressure may cause the cell caps to be ejected. If the ejected caps come into contact with the pressure relief plates, they may cause a short circuit, thus reducing the stability and safety of the battery pack during operation and failing to meet the requirements for battery pack use. Utility Model Content

[0003] The embodiments of this utility model provide a pressure relief component and a battery pack, which can improve the technical problem in related technologies where the cap is easily ejected, causing a short circuit in the battery pack.

[0004] In a first aspect, embodiments of this utility model provide a pressure relief component, which has a pressure relief channel and a pressure relief port and an air outlet respectively connected to the pressure relief channel. The pressure relief port is correspondingly provided with the explosion-proof valve of the battery cell. The pressure relief port is used to allow the gas ejected from the explosion-proof valve to flow into the pressure relief channel and be discharged from the air outlet. In this embodiment, a portion of the projection of the cap of the battery cell in the thickness direction of the pressure relief component is located outside the pressure relief port, and the width of the pressure relief port is L1. The diameter of the explosion-proof valve of the battery cell is R1, and 1 / 2R1≤L1≤R1.

[0005] In one embodiment, the pressure relief component includes a plurality of pressure relief ports, which are arranged in an array along the length and width directions of the pressure relief component.

[0006] In one embodiment, a pressure relief port is provided corresponding to the explosion-proof valves of at least two adjacent battery cells.

[0007] In one embodiment, the pressure relief port includes a waist-shaped orifice.

[0008] In one embodiment, an explosion-proof valve is correspondingly provided for one battery cell in the semi-circular structure at one end of the waist-shaped hole, and an explosion-proof valve is correspondingly provided for another battery cell in the adjacent semi-circular structure at the other end of the waist-shaped hole.

[0009] In one embodiment, the semicircular arc of the waist-shaped hole is coaxially arranged with the explosion-proof valve of the battery cell.

[0010] In one embodiment, the pressure relief component further includes: a plate having a pressure relief groove and a pressure relief port and an air outlet respectively connected to the pressure relief groove; and a sealing component disposed at both ends of the plate, the sealing component being used to seal both ends of the pressure relief groove, and the sealing component and the pressure relief groove working together to form a pressure relief channel.

[0011] In one embodiment, the plate body includes a first connecting plate, a second connecting plate, and a third connecting plate that are sequentially connected and arranged at an angle. The first connecting plate and the third connecting plate are located on the same side of the second connecting plate, and the first connecting plate and the third connecting plate extend in the same direction. A pressure relief port is provided on the first connecting plate, and a pressure relief groove is formed by the gap between the first connecting plate and the third connecting plate. The sealing element is respectively sealed to the side of the first connecting plate away from the third connecting plate and the side of the third connecting plate away from the first connecting plate.

[0012] In one embodiment, the first connecting plate has a first connecting hole, the sealing member has a second connecting hole, and the third connecting plate has a third connecting hole. The first connecting hole, the second connecting hole, and the third connecting hole are connected to each other in a corresponding manner. The fixing member is sequentially connected to the first connecting hole, the second connecting hole, and the third connecting hole to seal the sealing member to the first connecting plate and the third connecting plate.

[0013] In one embodiment, the pressure relief component further includes an insulating component, wherein the insulating component is provided on the side of the first connecting plate away from the third connecting plate and / or on the side of the third connecting plate away from the first connecting plate.

[0014] In one embodiment, the plate and the seal are made of the same material.

[0015] In one embodiment, both the plate and the seal are made of epoxy resin and glass fiber.

[0016] In one embodiment, the insulating element comprises mica paper.

[0017] Secondly, embodiments of this utility model provide a battery pack, which includes: the aforementioned pressure relief component; a battery module having multiple cells arranged in an array, wherein the pressure relief port of the pressure relief component is disposed on the side close to the cell.

[0018] By applying the technical solution of this utility model, the projection of the cell cap in the thickness direction of the pressure relief component is located inside the pressure relief port. During the operation of the battery pack, when the air pressure inside the cell is too high and the cap is ejected, the above structure can block the ejected cap to prevent it from entering the pressure relief channel. This ensures the normal operation of the pressure relief channel and also improves the stability and safety of the battery pack during operation, thus meeting the usage requirements of the battery pack. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional schematic diagram of the pressure relief component provided in an embodiment of this utility model;

[0021] Figure 2 This is a three-dimensional schematic diagram of the plate body provided in an embodiment of this utility model;

[0022] Figure 3 This is a three-dimensional schematic diagram of the sealing element provided in an embodiment of this utility model;

[0023] Figure 4 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0024] Figure 5 This is a top view schematic diagram of the battery pack provided in an embodiment of this utility model;

[0025] Figure 6 yes Figure 5 A cross-sectional view at point AA.

[0026] The above drawings include the following reference numerals:

[0027] 10. Pressure relief component; 11. Pressure relief channel; 12. Pressure relief port; 13. Air outlet; 14. Plate; 141. First connecting plate; 142. Second connecting plate; 143. Third connecting plate; 144. Pressure relief groove; 15. Seal; 16. First connecting hole; 17. Second connecting hole; 18. Third connecting hole;

[0028] 20. Battery cell; 21. Explosion-proof valve; 22. Cap;

[0029] 30. Fasteners;

[0030] 40. Insulating components;

[0031] 50. Battery module. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 6As shown, in a first aspect, an embodiment of the present invention provides a pressure relief component 10, which has a pressure relief channel 11 and a pressure relief port 12 and an outlet 13 respectively connected to the pressure relief channel. The pressure relief port 12 is correspondingly provided with the explosion-proof valve 21 of the battery cell 20. The pressure relief port 12 is used to allow the gas ejected from the explosion-proof valve 21 to flow into the pressure relief channel 11 and be discharged from the outlet 13. In this embodiment, a portion of the projection of the cap 22 of the battery cell 20 in the thickness direction of the pressure relief component 10 is located outside the pressure relief port 12, and the width of the pressure relief port 12 is L1, the diameter of the explosion-proof valve 21 of the battery cell 20 is R1, and 1 / 2R1≤L1≤R1.

[0034] By applying the technical solution of this utility model, the projection of the cap 22 of the cell 20 in the thickness direction of the pressure relief component 10 is located inside the pressure relief port 12. During the operation of the battery pack, when the air pressure inside the cell 20 is too high and the cap 22 is ejected, the above structure can block the ejected cap 22 to prevent it from entering the pressure relief channel. This ensures the normal operation of the pressure relief channel and also improves the stability and safety of the battery pack during operation, thus meeting the usage requirements of the battery pack.

[0035] In this application, another portion of the projection of the cap 22 of the cell 20 in the thickness direction of the pressure relief member 10 is located outside the pressure relief port 12.

[0036] In one embodiment, the pressure relief component 10 includes multiple pressure relief ports 12, which are arranged in an array along the length and width directions of the pressure relief component 10. Since the battery pack contains a large number of cells 20, this arrangement not only allows for corresponding configuration of the explosion-proof valves 21 for each cell 20 to meet the pressure relief requirements of the battery pack, but also enables the multiple pressure relief ports 12 to be centrally located in a specific area for unified management and maintenance. In cases requiring rapid pressure relief, the multiple pressure relief ports 12 can simultaneously relieve pressure, significantly improving pressure relief efficiency and ensuring that the pressure within the cells 20 is rapidly reduced to a safe level. Furthermore, the array arrangement provides redundancy for the pressure relief plate; even if some pressure relief ports 12 malfunction, others can still function, ensuring the overall reliability of the system. Moreover, the array arrangement can be rationally laid out according to the specific shape and size of the pressure relief plate, ensuring that the pressure relief ports 12 meet the pressure relief requirements without excessive space occupation.

[0037] Optionally, in other embodiments of this application, the pressure relief port 12 may be arranged in other ways. The specific arrangement should be selected according to the usage environment of the device, so as to improve the applicability and scope of use of the pressure relief component 10.

[0038] In one embodiment, a pressure relief port 12 is configured to correspond to at least two explosion-proof valves 21 of adjacent battery cells 20. This configuration allows for simultaneous pressure relief of at least two battery cells 20, thereby meeting the pressure relief requirements of the battery pack. In other embodiments of this application, a pressure relief port 12 may also correspond to multiple explosion-proof valves 21 of battery cells 20, as long as the pressure relief requirements of the battery pack are met. The specific correspondence is not limited here.

[0039] In one embodiment, the pressure relief port 12 includes an oblong orifice. Compared to a circular orifice, the oblong orifice design, being narrower in the middle and wider at both ends, allows pressure waves to propagate more smoothly without excessive reflection or attenuation at the orifice opening, thus improving fluid transport efficiency. The oblong orifice design also helps reduce the impact of pressure waves and vibrations on the system. The generation of pressure waves can lead to system pressure instability and vibration of mechanical components; the oblong orifice can reduce the generation of such fluctuations, improving system stability and reliability. Simultaneously, the oblong orifice exhibits certain advantages in fluid flow characteristics.

[0040] In one embodiment, the width of the oblong orifice is L1, and the diameter of the explosion-proof valve 21 of the battery cell 20 is R1, where 1 / 2R1≤L1≤R1. When L1>R1 or L1<1 / 2R1, an excessively large pressure relief orifice will allow more battery cell 20 caps 22 to be ejected. These broken battery cell 20 caps 22 will affect the structure and pressure relief function of the pressure relief plate, thereby reducing the safety of the pressure relief plate during use. When the pressure relief orifice is too small, its pressure release capability will be limited, failing to meet the need for rapid pressure release under specific conditions. This may lead to continuous pressure accumulation within the battery pack, increasing the risk of battery pack explosion or leakage.

[0041] In one embodiment, the explosion-proof valve 21 of one battery cell 20 is correspondingly provided on the semi-circular structure at one end of the waist-shaped hole, and the explosion-proof valve 21 of the adjacent battery cell 20 is correspondingly provided on the semi-circular structure at the other end of the waist-shaped hole. By setting the above structure, the mutual interference between two adjacent battery cells 20 during pressure relief can be avoided, thereby ensuring the stability of the battery cell 20 during pressure relief.

[0042] In one embodiment, the semicircular arc of the oblong hole is coaxially arranged with the explosion-proof valve 21 of the battery cell 20. This not only facilitates the processing of the oblong hole, but also simplifies the processing flow, reduces processing steps, and thus lowers processing costs and difficulty.

[0043] In one embodiment, the pressure relief component 10 further includes: a plate 14 having a pressure relief groove 144 and a pressure relief port 12 and an air outlet 13 respectively connected to the pressure relief groove 144; and a sealing member 15 disposed at both ends of the plate 14, the sealing member 15 being used to seal both ends of the pressure relief groove 144, and the sealing member 15 and the pressure relief groove 144 cooperating to form a pressure relief channel 11. By setting the above structure, it is ensured that the gas inside the battery cell 20 will not leak out from the gap of the plate 14, thereby maintaining the normal operating pressure and efficiency of the battery pack. Furthermore, it can prevent external environmental corrosion of the battery pack interior and protect the internal components of the battery pack from damage.

[0044] In one embodiment, the plate body 14 includes a first connecting plate 141, a second connecting plate 142, and a third connecting plate 143 connected sequentially and arranged at an included angle. The first connecting plate 141 and the third connecting plate 143 are located on the same side of the second connecting plate 142, and the first connecting plate 141 and the third connecting plate 143 extend in the same direction. A pressure relief port 12 is provided on the first connecting plate 141, and a pressure relief groove 144 is formed by the gap between the first connecting plate 141 and the third connecting plate 143. A sealing member 15 is respectively sealed to the side of the first connecting plate 141 away from the third connecting plate 143 and the side of the third connecting plate 143 away from the first connecting plate 141. With the above structure, the sealing performance of the plate body 14 can be guaranteed to meet the user's usage requirements.

[0045] In this application, the plate 14 is a one-piece molded structure. During manufacturing, multiple components are connected in one go using CNC machine tools and special manufacturing processes to form a complete unit, avoiding gap problems inherent in traditional assembly methods and thus significantly improving structural stability. This stability helps improve the overall structural strength and other properties, enhancing structural reliability. Simultaneously, the one-piece molded structure possesses high strength and durability, and through optimized material usage and structural design during the design and manufacturing process, significant weight reduction can be achieved. This weight reduction helps reduce the structure's own weight, thereby lowering production costs.

[0046] Furthermore, the one-piece molded structure eliminates many complex steps in traditional assembly methods, such as welding and bolting, making the installation process faster and simpler. This not only saves installation time and costs but also reduces the error rate during installation.

[0047] Optionally, in other embodiments of this application, the plate 14 can also be configured as a split structure, consisting of multiple modules, each of which can be disassembled independently. This means that when a module fails, maintenance personnel only need to focus on that module, without having to perform a large-scale disassembly of the entire system or equipment. This design greatly reduces the complexity and time cost of maintenance. Because the modules are detachable, when a damaged part needs to be replaced, it can be done quickly, reducing the impact on the overall system operation. This ability to quickly replace parts ensures the continuity and reliability of the equipment.

[0048] Meanwhile, the modular design allows for flexible combination to meet diverse usage scenarios and needs. This flexibility enables the device to adapt to various complex and changing environments and conditions. As usage demands increase, new modules can be easily added to expand the system. This scalability helps extend the device's lifespan and reduce future upgrade costs.

[0049] In one embodiment, the first connecting plate 141 has a first connecting hole 16, the sealing element 15 has a second connecting hole 17, and the third connecting plate 143 has a third connecting hole 18. The first connecting hole 16, the second connecting hole 17, and the third connecting hole 18 are connected to each other. The fixing element 30 passes through the first connecting hole 16, the second connecting hole 17, and the third connecting hole 18 in sequence to seal the sealing element 15 to the first connecting plate 141 and the third connecting plate 143. In this application, the fixing element 30 is a fastening bolt. One of the most significant features of bolt fixing is its detachability. Compared with fixing methods such as welding and riveting, bolt fixing can be easily disassembled and replaced, which is very beneficial for the maintenance and repair of the plate 14 and the sealing element 15. When it is necessary to inspect and replace parts, the detachability of bolt fixing can greatly save time and labor costs. At the same time, bolt fixing can provide relatively stable friction and tension, ensuring the tightness and reliability of the connection between the plate 14 and the sealing element 15. When subjected to external impact or vibration, bolt fixing can better distribute the force, reduce the risk of loosening and failure, and thus protect the safety of plate 14 and seal 15.

[0050] Furthermore, bolted connections offer significant flexibility and adaptability. Different types of bolts and nuts can be used in combination to meet diverse connection requirements. Additionally, the length, quantity, and spacing of the bolts can be adjusted according to actual needs to accommodate various engineering applications. This flexibility allows bolted connections to be applied in a variety of complex and dynamic scenarios. Compared to welding and riveting, bolted connections are relatively cheaper and more economical. Moreover, bolted connections are easier to manufacture, install, and maintain, making them more suitable for large-scale production and use. Simultaneously, bolts are typically made of high-strength steel or other alloy materials, possessing high load-bearing capacity and durability. In applications requiring high loads and vibrations, bolted connections provide stable and reliable connections. Bolted connection points are usually readily visible, facilitating inspection and adjustment. During equipment operation, bolt tightening force can be periodically checked to ensure the stability and reliability of the connection. Furthermore, bolted connections offer a convenient way to adjust or modify the connection if necessary.

[0051] In one embodiment, the pressure relief component 10 further includes an insulating component 40, which is provided on the side of the first connecting plate 141 away from the third connecting plate 143 and / or on the side of the third connecting plate 143 away from the first connecting plate 141. By providing the above structure, it is possible to prevent the ejected cap 22 or electrolyte from coming into contact with other structures and thus reducing the stability of the battery pack during operation.

[0052] In one embodiment, the plate 14 and the seal 15 are made of the same material. Consistency and reliability: Using the same material ensures the performance consistency between the plate 14 and the seal 15. This consistency helps reduce performance fluctuations caused by material differences, improving product reliability and stability. Using the same material also simplifies the procurement process and reduces procurement costs. Furthermore, material consistency can reduce waste and defect rates during production, further controlling costs. Using the same material enhances the substitutability between different components or products. This facilitates quickly finding replacement parts during repair and replacement, reducing maintenance difficulty and costs. The same material facilitates standardized and modular product design. Standardized design reduces production difficulty and costs, improving production efficiency; while modular design facilitates product upgrades and expansion, increasing product flexibility and adaptability.

[0053] In one embodiment, both the plate 14 and the seal 15 are made of epoxy resin and glass fiber. The epoxy resin and glass fiber composite material, namely glass fiber reinforced epoxy resin matrix composite (GFEP), has extremely high strength and stiffness, enabling it to maintain structural integrity under significant pressure and impact. This improves the service life of the plate 14 and the seal 15. Simultaneously, the composite material exhibits low molding shrinkage and good dimensional stability, ensuring that the plate 14 and the seal 15 are not easily deformed during use. Since epoxy resin itself has excellent corrosion resistance, it effectively resists the erosion of chemicals such as acids and alkalis. When combined with glass fiber, this corrosion resistance is further enhanced, allowing the plate 14 and the seal 15 to be used for extended periods under harsh environmental conditions. Furthermore, the epoxy resin and glass fiber composite material can withstand high temperatures, making it a good high-temperature material, thus meeting the requirements of battery pack applications.

[0054] Furthermore, both epoxy resin and glass fiber are insulating materials, therefore their composite material also possesses excellent electrical insulation properties, thus further improving the insulation performance of the plate 14 and the seal 15. The epoxy resin and glass fiber composite material can be processed using various molding methods, such as injection molding, extrusion, and compression molding. These molding methods are simple and easy to implement, and can meet the production needs of different shapes. The composite material can be made into plates 14 and seals 15 of different shapes and sizes to meet various complex design requirements. At the same time, epoxy resin is a recyclable material that does not pollute the environment, aligning with the concept of sustainable development. Compared to traditional metal materials, the epoxy resin and glass fiber composite material has a lower density, resulting in lighter weight, which helps reduce the overall weight of the plate 14 and seal 15 and improve energy efficiency.

[0055] In one embodiment, the insulating element 40 comprises mica paper. Due to its highly arranged mica sheet structure, mica paper possesses excellent electrical insulation properties. This characteristic enables it to effectively isolate current in electrical equipment, preventing electrical faults such as leakage and short circuits. Mica paper maintains stable performance at high temperatures, typically withstanding temperatures of several hundred degrees Celsius, and some high-temperature resistant mica papers can even withstand higher temperatures. This gives it a significant advantage in applications requiring high-temperature insulation, heat insulation, and fire resistance. Although mica paper is thin and brittle, it possesses a certain degree of flexibility, allowing it to be cut and folded, facilitating the manufacture of insulating elements 40 into various shapes. This flexibility makes mica paper more flexible and convenient to process and use. Mica paper exhibits good stability to most chemicals and has a certain degree of corrosion resistance to acidic and alkaline environments. This allows it to maintain stable performance in various chemical environments, extending its service life. Compared to materials such as ordinary steel, mica paper is lighter, making it more portable and easier to handle and use. This reduces transportation and installation costs to some extent. Mica paper is an environmentally friendly material that does not contain asbestos or other harmful substances. It does not produce toxic gases at high temperatures, making it both environmentally friendly and safe.

[0056] Secondly, an embodiment of the present invention provides a battery pack, which includes: the aforementioned pressure relief component 10; a battery module 50 having multiple arrayed battery cells 20, wherein the pressure relief port 12 of the pressure relief component 10 is disposed on the side close to the battery cell 20.

[0057] By applying the technical solution of this utility model, the projection of the cap 22 of the cell 20 in the thickness direction of the pressure relief component 10 is located inside the pressure relief port 12. During the operation of the battery pack, when the air pressure inside the cell 20 is too high and the cap 22 is ejected, the above structure can block the ejected cap 22 to prevent it from entering the pressure relief channel. This ensures the normal operation of the pressure relief channel and also improves the stability and safety of the battery pack during operation, thus meeting the usage requirements of the battery pack.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure relief component, characterized in that, The pressure relief component has a pressure relief channel and a pressure relief port and an air outlet respectively connected to the pressure relief channel. The pressure relief port is correspondingly provided with the explosion-proof valve of the battery cell. The pressure relief port is used to allow the gas ejected from the explosion-proof valve to flow into the pressure relief channel and be discharged from the air outlet. Wherein, a portion of the projection of the cap of the battery cell in the thickness direction of the pressure relief component is located outside the pressure relief port, and the width of the pressure relief port is L1, the diameter of the explosion-proof valve of the battery cell is R1, and 1 / 2R1≤L1≤R1.

2. The pressure relief component according to claim 1, characterized in that, The pressure relief component includes a plurality of pressure relief ports, which are arranged in an array along the length and width directions of the pressure relief component.

3. The pressure relief component according to claim 2, characterized in that, Each of the pressure relief ports is provided with an explosion-proof valve corresponding to at least two adjacent battery cells.

4. The pressure relief component according to any one of claims 1-3, characterized in that, The pressure relief port includes a waist-shaped hole.

5. The pressure relief component according to claim 4, characterized in that, The explosion-proof valve of one of the battery cells is correspondingly provided in the semi-circular structure at one end of the waist-shaped hole, and the explosion-proof valve of the other battery cell is correspondingly provided in the semi-circular structure at the other end of the waist-shaped hole.

6. The pressure relief component according to claim 5, characterized in that, The semi-circular arc of the waist-shaped hole is coaxially arranged with the explosion-proof valve of the battery cell.

7. The pressure relief component according to claim 1, characterized in that, The pressure relief component also includes: The plate has a pressure relief groove and a pressure relief port and an air outlet respectively connected to the pressure relief groove; A sealing element is disposed at both ends of the plate body. The sealing element is used to seal both ends of the pressure relief groove, and the sealing element and the pressure relief groove cooperate to form the pressure relief channel.

8. The pressure relief component according to claim 7, characterized in that, The plate body includes a first connecting plate, a second connecting plate, and a third connecting plate connected sequentially and arranged at an angle. The first connecting plate and the third connecting plate are located on the same side of the second connecting plate, and the first connecting plate and the third connecting plate extend in the same direction. The pressure relief port is provided on the first connecting plate. The gap between the first connecting plate and the third connecting plate forms the pressure relief groove. The sealing element is respectively sealed to the side of the first connecting plate away from the third connecting plate and the side of the third connecting plate away from the first connecting plate.

9. The pressure relief component according to claim 8, characterized in that, The first connecting plate has a first connecting hole, the sealing element has a second connecting hole, and the third connecting plate has a third connecting hole. The first connecting hole, the second connecting hole, and the third connecting hole are connected to each other in a corresponding manner. The fixing element passes through and connects to the first connecting hole, the second connecting hole, and the third connecting hole in sequence to seal the sealing element to the first connecting plate and the third connecting plate.

10. The pressure relief component according to claim 8, characterized in that, The pressure relief component also includes an insulating component, which is provided on the side of the first connecting plate away from the third connecting plate and / or on the side of the third connecting plate away from the first connecting plate.

11. The pressure relief component according to claim 8, characterized in that, The plate is made of the same material as the seal.

12. The pressure relief component according to claim 11, characterized in that, Both the plate and the seal are made of epoxy resin and glass fiber.

13. The pressure relief component according to claim 10, characterized in that, The insulating component includes mica paper.

14. A battery pack, characterized in that, The battery pack includes: The pressure relief component as described in any one of claims 1-13; The battery module has multiple cells arranged in an array, and the pressure relief port of the pressure relief component is located on the side close to the cell.

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