Pressure relief piece and battery pack

Abstract

The invention provides a pressure relief piece and a battery pack, the pressure relief piece is provided with a pressure relief channel, and a pressure relief opening and a gas 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 gas 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 invention, the technical problem of short circuit of the battery pack caused by easy ejection of the cap in the related technology can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a pressure relief component and a battery pack. Background Art

[0002] In the application of battery packs, a pressure relief plate is usually provided for relieving pressure when a battery cell has thermal runaway. A pressure relief channel is provided in the pressure relief plate, and an exhaust port is provided on the pressure relief channel. The explosion-proof valve of the battery cell is aligned with the exhaust port to be used for exhaust and pressure relief of the battery cell. However, during the pressure relief process, the cap of the battery cell may be ejected due to excessive air pressure inside the battery cell. After the ejected cap contacts the pressure relief plate, there is a risk of short circuit, thereby reducing the stability and safety of the battery pack during operation, and failing to meet the use requirements of the battery pack. Summary of the invention

[0003] The embodiments of the present invention provide a pressure relief member and a battery pack, which can improve the technical problem in the related art that a cap is easily ejected and causes a short circuit in the battery pack.

[0004] In the first aspect, an embodiment of the present invention provides 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 arranged corresponding to the explosion-proof valve of the battery cell, and 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 part 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 member includes a plurality of pressure relief ports, and the plurality of pressure relief ports are arranged in an array along the length direction and the width direction of the pressure relief member.

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

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

[0008] In one embodiment, the explosion-proof valve of one battery cell of the semicircular structure at one end of the waist-shaped hole is correspondingly arranged, and the explosion-proof valve of another battery cell adjacent to the semicircular structure at the other end of the waist-shaped hole is correspondingly arranged.

[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 also includes: a plate body, having a pressure relief groove and a pressure relief port and an air outlet respectively connected to the pressure relief groove; a sealing member, which is arranged at both ends of the plate body, and the sealing member is used to seal the two ends of the pressure relief groove, and the sealing member cooperates with the pressure relief groove 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 which are connected in sequence 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 have the same extension direction, the pressure relief port is arranged on the first connecting plate, the interval between the first connecting plate and the third connecting plate forms a pressure relief groove, and the seal is respectively sealed and connected to a side of the first connecting plate away from the third connecting plate and a 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 correspondingly. The fixing member is sequentially penetrated and 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 member further includes an insulating member, and the insulating member is disposed on a side of the first connecting plate away from the third connecting plate and / or a side of the third connecting plate away from the first connecting plate.

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

[0015] In one embodiment, the materials of the plate body and the sealing element are both epoxy resin and glass fiber.

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

[0017] In a second aspect, an embodiment of the present invention provides a battery pack, comprising: the above-mentioned pressure relief member; a battery module having a plurality of battery cells arranged in an array, wherein the pressure relief port of the pressure relief member is arranged close to one side of the battery cell.

[0018] By applying the technical solution of the present invention, the projection of the cap of the battery cell in the thickness direction of the pressure relief piece is located within the pressure relief port. During the operation of the battery pack, when the air pressure in the battery cell is too high and the cap is ejected, the ejected cap can be blocked by the above structure to prevent the ejected cap 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 to meet the use requirements of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a three-dimensional schematic diagram of a pressure relief member provided by an embodiment of the present invention;

[0021] Figure 2 is a three-dimensional schematic diagram of a plate body provided by an embodiment of the present invention;

[0022] Figure 3 is a three-dimensional schematic diagram of a sealing member provided by an embodiment of the present invention;

[0023] Figure 4 is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic top view of a battery pack provided by an embodiment of the present invention;

[0025] Figure 6 yes Figure 5 Schematic diagram of the cross section at AA in the middle.

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

[0027] 10. pressure relief member; 11. pressure relief channel; 12. pressure relief port; 13. air outlet; 14. plate body; 141. first connecting plate; 142. second connecting plate; 143. third connecting plate; 144. pressure relief groove; 15. sealing member; 16. first connecting hole; 17. second connecting hole; 18. third connecting hole;

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

[0029] 30. Fixing parts;

[0030] 40. Insulation parts;

[0031] 50. Battery module. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 6As shown, in the first aspect, an embodiment of the present invention provides a pressure relief member 10, the pressure relief member 10 having a pressure relief channel 11 and a pressure relief port 12 and an air outlet 13 respectively connected to the pressure relief channel, the pressure relief port 12 is arranged corresponding to the explosion-proof valve 21 of the battery cell 20, and 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 air outlet 13; wherein, a portion of the projection of the cap 22 of the battery cell 20 in the thickness direction of the pressure relief member 10 is located outside the pressure relief port 12, and the width of the pressure relief port 12 is L1, and the diameter of the explosion-proof valve 21 of the battery cell 20 is R1, 1 / 2R1≤L1≤R1.

[0034] By applying the technical solution of the present invention, the projection of the cap 22 of the battery cell 20 in the thickness direction of the pressure relief member 10 is located within the pressure relief port 12. During the operation of the battery pack, when the air pressure in the battery cell 20 is too high and the cap 22 is ejected, the ejected cap 22 can be blocked by the above structure to prevent the ejected cap 22 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 to meet the use requirements of the battery pack.

[0035] In the present application, another portion of the projection of the cap 22 of the battery 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 member 10 includes a plurality of pressure relief ports 12, and the plurality of pressure relief ports 12 are arranged in an array along the length direction and the width direction of the pressure relief member 10. Since there are a large number of cells 20 in the battery pack, not only can the explosion-proof valves 21 of the plurality of cells 20 be set correspondingly to meet the pressure relief requirements of the battery pack, but also through the array arrangement, the plurality of pressure relief ports 12 can be concentrated in a specific area for easy unified management and maintenance. In the case of rapid pressure relief, the plurality of pressure relief ports 12 can be used for pressure relief at the same time, which significantly improves the pressure relief efficiency and ensures that the pressure in the cell 20 is quickly reduced to a safe level. At the same time, the array arrangement is equivalent to providing a redundant design for the pressure relief plate. Even if some of the pressure relief ports 12 cannot work normally due to a fault, the other pressure relief ports 12 can continue to function to ensure the overall reliability of the system. Furthermore, the array arrangement can be reasonably arranged according to the specific shape and size of the pressure relief plate to ensure that the pressure relief ports 12 can meet the pressure relief requirements without taking up too much space.

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

[0038] In one embodiment, one pressure relief port 12 is provided corresponding to the explosion-proof valves 21 of at least two adjacent battery cells 20. In this way, the pressure of at least two battery cells 20 can be relieved at the same time, thereby meeting the pressure relief requirements of the battery pack. At the same time, in other embodiments of the present application, one pressure relief port 12 can also be provided corresponding to the explosion-proof valves 21 of multiple battery cells 20, as long as the pressure relief requirements of the battery pack can be met, and the specific corresponding situation is not limited here.

[0039] In one embodiment, the pressure relief port 12 includes a waist-shaped hole. Compared with a circular hole, the waist-shaped hole is narrower in the middle and wider at both ends, so the pressure wave can propagate more smoothly in the waist-shaped hole without excessive reflection or attenuation at the hole mouth, thereby improving the fluid delivery efficiency. The waist-shaped hole design helps to reduce the impact of pressure waves and vibrations on the system. The generation of pressure waves can lead to instability of system pressure and vibration of mechanical parts, and the waist-shaped hole can reduce the generation of such fluctuations and improve the stability and reliability of the system. At the same time, the waist-shaped hole shows certain advantages in fluid flow characteristics.

[0040] In one embodiment, the width of the waist-shaped hole is L1, the diameter of the explosion-proof valve 21 of the battery cell 20 is R1, and 1 / 2R1≤L1≤R1. When L1>R1 or L1<1 / 2R1, the pressure relief hole is too large to allow more battery cell 20 caps 22 to be ejected, and 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 when in use. When the pressure relief hole is too small, its ability to release pressure will be limited and cannot meet the need for rapid pressure release under specific conditions, which may cause pressure to continue to accumulate in 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 of the semicircular structure at one end of the waist-shaped hole is correspondingly provided, and the explosion-proof valve 21 of another battery cell 20 adjacent to the semicircular structure at the other end of the waist-shaped hole is correspondingly provided. By providing the above structure, it is possible to avoid mutual interference between two adjacent battery cells 20 during pressure relief, thereby ensuring the stability of the battery cells 20 during pressure relief.

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

[0043] In one embodiment, the pressure relief member 10 further includes: a plate body 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; a seal 15 disposed at both ends of the plate body 14, the seal 15 being used to seal both ends of the pressure relief groove 144, and the seal 15 and the pressure relief groove 144 cooperate to form a pressure relief channel 11. By setting the above structure, it is ensured that the gas in the battery cell 20 will not leak out from the gap of the plate body 14, thereby maintaining the normal working pressure and efficiency of the battery pack. It can also prevent the external environment from corroding the interior of the battery pack 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 which are connected in sequence and arranged at an 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, the pressure relief port 12 is arranged on the first connecting plate 141, the interval between the first connecting plate 141 and the third connecting plate 143 forms a pressure relief groove 144, and the sealing member 15 is respectively sealed and connected to a side of the first connecting plate 141 away from the third connecting plate 143 and a side of the third connecting plate 143 away from the first connecting plate 141. Through the above structure, the sealing performance of the plate body 14 can be ensured to meet the use requirements of users.

[0045] In the present application, the plate body 14 is an integrally formed structure. During the manufacturing process, the integrally formed structure uses CNC machine tools and special manufacturing processes to connect multiple components at one time to form a complete unit, avoiding the gap problem in the traditional assembly method, thereby greatly improving the stability of the structure. This stability helps to improve the strength and other properties of the overall structure and enhance the reliability of the structure. At the same time, the integrally formed structure has high strength and durability, and the integrally formed structure can achieve a significant lightweight effect by optimizing material use and structural design during the design and manufacturing process. This lightweighting helps to reduce the weight of the structure itself, thereby reducing production costs.

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

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

[0048] At the same time, the modules of the split structure can be freely combined as needed to meet different usage scenarios and needs. This flexibility enables the equipment to adapt to a variety of complex and changing environments and conditions. As usage needs increase, new modules can be easily added to expand. This scalability helps to extend the service life of the equipment and reduce future upgrade costs.

[0049] In one embodiment, the first connecting plate 141 has a first connecting hole 16, the sealing member 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 in correspondence, and the fixing member 30 is connected to the first connecting hole 16, the second connecting hole 17, and the third connecting hole 18 in sequence to seal the sealing member 15 with the first connecting plate 141 and the third connecting plate 143. In the present application, the fixing member 30 is a fastening bolt, and one of the most notable 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 body 14 and the sealing member 15. When it is necessary to check 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 to ensure the tightness and reliability of the connection between the plate body 14 and the sealing member 15. When subjected to external impact or vibration, bolt fixing can better disperse the force and reduce the risk of loosening and failure, thereby protecting the safety of the plate body 14 and the seal 15 .

[0050] Furthermore, bolt fixing has strong flexibility and adaptability. Different types of bolts and nuts can be used in combination to meet different connection requirements. In addition, the length, number and spacing of the bolts can also be adjusted according to actual needs to meet different engineering application requirements. This flexibility allows bolt fixing to be used in various complex and changeable scenarios. Compared with welding, riveting and other fixing methods, the cost of bolt fixing is relatively low and more economical. In addition, the manufacture, installation and maintenance of bolt fixing are also more convenient and more suitable for large-scale production and use. At the same time, bolts are usually made of high-strength steel or other alloy materials, with high bearing capacity and durability. In situations where large loads and vibrations need to be borne, bolt fixing can provide a stable and reliable connection. The connection points of bolt fixing are usually obvious and easy to check and adjust. During the operation of the device, the tightening force of the bolts can be checked regularly to ensure the stability and reliability of its connection. At the same time, if the connection needs to be adjusted or modified, bolt fixing also provides a more convenient way.

[0051] In one embodiment, the pressure relief member 10 further includes an insulating member 40, and the insulating member 40 is provided on a side of the first connecting plate 141 away from the third connecting plate 143 and / or on a 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 reducing the stability of the battery pack during operation.

[0052] In one embodiment, the plate body 14 and the seal 15 are made of the same material. Consistency and reliability: When the same material is used, the consistency of the performance of the plate body 14 and the seal 15 can be ensured. This consistency helps to reduce performance fluctuations caused by material differences and improve the reliability and stability of the product. At the same time, using the same material can simplify the procurement process and reduce procurement costs. At the same time, due to the consistency of materials, it is also possible to reduce waste and defective product rates in the production process, further controlling costs. When the same material is used, the interchangeability between different components or products is enhanced. This helps to quickly find replacement parts during repairs and replacements, reducing the difficulty and cost of maintenance. The same material helps to achieve standardization and modular design of products. Standardized design can reduce production difficulty and cost and improve production efficiency; while modular design facilitates product upgrades and expansions, and improves product flexibility and adaptability.

[0053] In one embodiment, the materials of the plate body 14 and the seal 15 are both epoxy resin plus glass fiber. The composite material of epoxy resin plus glass fiber, that is, glass fiber reinforced epoxy resin-based composite material (GFEP), has extremely high strength and rigidity, which enables it to maintain structural integrity when subjected to greater pressure and impact. Thereby, the service life of the plate body 14 and the seal 15 can be improved. At the same time, the composite material has small forming shrinkage and good dimensional stability, which can ensure that the plate body 14 and the seal 15 are not easily deformed during use. Since epoxy resin itself has excellent corrosion resistance, it can well resist the erosion of chemical substances such as acids and alkalis. When combined with glass fiber, this corrosion resistance is further enhanced, so that the plate body 14 and the seal 15 can be used for a long time under harsh environmental conditions. Furthermore, the epoxy resin plus glass fiber composite material can withstand high temperatures and is a good high-temperature material, which can meet the use requirements of the battery pack.

[0054] Furthermore, epoxy resin and glass fiber are both insulating materials, so their composite materials also have good electrical insulation properties, thereby further improving the insulation properties of the plate 14 and the seal 15. Epoxy resin plus glass fiber composite materials can be processed by a variety of molding methods, such as injection molding, extrusion, compression molding, etc. These molding methods are simple and easy to implement, and can meet the production needs of different shapes. Composite materials 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 and is in line with the concept of sustainable development. Compared with traditional metal materials, epoxy resin plus glass fiber composite materials have a lower density and are therefore lighter in weight, which is conducive to reducing the overall weight of the plate 14 and the seal 15 and improving energy efficiency.

[0055] In one embodiment, the insulating member 40 includes mica paper. Mica paper has excellent electrical insulation properties due to its highly arranged mica sheet structure. This property enables it to effectively isolate current in electrical equipment and prevent electrical faults such as leakage and short circuit. Mica paper can maintain stable performance in high temperature environments and can usually withstand temperatures of several hundred degrees Celsius. Some high-temperature resistant mica papers can even withstand higher temperatures. This makes it have significant advantages in occasions with high requirements such as high-temperature insulation, heat insulation and fire resistance. Although mica paper is thin and brittle, it has a certain flexibility and can be cut and folded to facilitate the manufacture of insulating members 40 of various shapes. This flexibility makes mica paper more flexible and convenient during processing and use. Mica paper has good stability to most chemical substances and has a certain corrosion resistance to acid and alkali environments. This enables it to maintain stable performance in a variety of chemical environments and extend its service life. Compared with materials such as ordinary steel, mica paper has a lighter weight, so it is more lightweight and portable, and is extremely easy to carry and use. This reduces transportation and installation costs to a certain extent. Mica paper is an environmentally friendly material that does not contain harmful substances such as asbestos. It does not produce toxic gases at high temperatures and is environmentally friendly and safe.

[0056] In a second aspect, an embodiment of the present invention provides a battery pack, comprising: the above-mentioned pressure relief member 10; a battery module 50 having a plurality of battery cells 20 arranged in an array, and a pressure relief port 12 of the pressure relief member 10 is disposed close to one side of the battery cell 20.

[0057] By applying the technical solution of the present invention, the projection of the cap 22 of the battery cell 20 in the thickness direction of the pressure relief member 10 is located within the pressure relief port 12. During the operation of the battery pack, when the air pressure in the battery cell 20 is too high and the cap 22 is ejected, the ejected cap 22 can be blocked by the above structure to prevent the ejected cap 22 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 to meet the use requirements of the battery pack.

[0058] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof. Unless otherwise specifically stated, the relative arrangement of the components and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the authorized specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0059] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure relief component, characterized in that: The pressure relief member 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 arranged corresponding to the explosion-proof valve of the battery cell, and 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; Part of the projection of the cap of the battery cell in the thickness direction of the pressure relief piece 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 member according to claim 1, characterized in that: The pressure relief member includes a plurality of pressure relief ports, and the plurality of pressure relief ports are arranged in an array along the length direction and the width direction of the pressure relief member.

3. The pressure relief member according to claim 2, characterized in that: One of the pressure relief ports is arranged corresponding to at least two adjacent explosion-proof valves of the battery cells.

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

5. The pressure relief member according to claim 4, characterized in that: The semicircular structure at one end of the waist-shaped hole is provided correspondingly to the explosion-proof valve of one of the batteries, and the semicircular structure at the other end of the waist-shaped hole is provided correspondingly to the explosion-proof valve of another battery adjacent to the semicircular structure.

6. The pressure relief member according to claim 5, characterized in that: The semicircular arc of the waist-shaped hole is coaxially arranged with the explosion-proof valve of the battery core.

7. The pressure relief member according to any one of claims 1, characterized in that: The pressure relief member also includes: A plate body having a pressure relief groove and the pressure relief port and the air outlet respectively connected to the pressure relief groove; A sealing member is arranged at both ends of the plate body, and is used to seal both ends of the pressure relief groove, and the sealing member cooperates with the pressure relief groove to form the pressure relief channel.

8. The pressure relief member according to claim 7, characterized in that: The plate body includes a first connecting plate, a second connecting plate and a third connecting plate which are connected in sequence 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 have the same extension direction, the pressure relief port is arranged on the first connecting plate, the interval between the first connecting plate and the third connecting plate forms the pressure relief groove, and the sealing member is respectively sealed and connected to a side of the first connecting plate away from the third connecting plate and a side of the third connecting plate away from the first connecting plate.

9. The pressure relief member according to claim 8, characterized in that: 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 correspondingly, and the fixing member is sequentially penetrated and connected to the first connecting hole, the second connecting hole, and the third connecting hole to seal the sealing member with the first connecting plate and the third connecting plate.

10. The pressure relief member according to claim 8, characterized in that: The pressure relief member further includes an insulating member, and the insulating member is disposed on a side of the first connecting plate away from the third connecting plate and / or a side of the third connecting plate away from the first connecting plate.

11. The pressure relief member according to claim 8, characterized in that: The plate body and the sealing member are made of the same material.

12. The pressure relief member according to claim 11, characterized in that: The materials of the plate body and the sealing element are both epoxy resin and glass fiber.

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

14. A battery pack, characterized in that: The battery pack comprises: The pressure relief member according to any one of claims 1 to 13; The battery module comprises a plurality of battery cells arranged in an array, wherein the pressure relief port of the pressure relief member is arranged close to one side of the battery cells.

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