Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer, a box body and a pressure relief device, the box body forms an accommodating space for accommodating the battery monomer, the pressure relief device comprises a main body and a plugging mechanism, the main body is connected to the box body and forms an accommodating cavity and a first opening communicated with the accommodating cavity, the first opening is communicated with the accommodating space, and the plugging mechanism is used for plugging the accommodating cavity. One port of a guide tube on the main body is communicated with the accommodating cavity, and the other port is communicated with the outside; and the plugging mechanism is arranged in the accommodating cavity to plug the first opening and is configured to unplug the first opening when the battery monomers are in thermal runaway. The main body is provided with a guide pipe communicated with the accommodating cavity, and when the battery monomers are in thermal runaway, discharged substances can enter the accommodating cavity from the accommodating space through the first opening and are discharged to the outside under the guide of the guide pipe, so that the discharge direction of the discharged substances can be limited by the guide pipe, and the discharged substances are not easy to spray around; the possibility that the discharged substances are in contact with surrounding inflammable substances is reduced, and the use reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0003] With the continuous development of battery technology, the application scope of batteries is becoming wider and wider, and how to improve the reliability of battery devices has attracted more and more attention from technicians in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, wherein the housing of the battery device is conducive to improving the reliability of the battery device.

[0005] In a first aspect, some embodiments of the present application provide a battery device, which includes a battery cell, a box body and a pressure relief device, wherein the box body forms a storage space for accommodating the battery cell, and the pressure relief device includes a main body and a sealing mechanism, the main body is connected to the box body and forms a storage cavity and a first opening connected to the storage cavity, the first opening is connected to the storage space, and a guide tube is provided on the main body, one port of the guide tube is connected to the storage cavity, and the other port is connected to the outside; the sealing mechanism is arranged in the storage cavity to seal the first opening and is configured to release the blockage of the first opening when the battery cell has thermal runaway.

[0006] In the above structure, since the main body is provided with a guide tube connected to the cavity, when the battery cell thermally runs away, the leaked material can enter the cavity from the accommodating space through the first opening, and be discharged to the outside under the guidance of the guide tube, so that the discharge direction of the leaked material can be limited by the guide tube, and the leaked material is not easy to spray everywhere, which reduces the possibility of the leaked material contacting the surrounding flammable materials, which is beneficial to improving the reliability of the use of the battery device.

[0007] According to the battery device provided in some embodiments of the present application, the box body includes a wall body, the wall body is provided with a pressure relief hole penetrating along the thickness direction of the wall body, and the main body is connected to the wall body at the pressure relief hole, so that the first opening of the main body can be conveniently connected to the accommodating space through the pressure relief hole.

[0008] According to the battery device provided in some embodiments of the present application, the main body is connected to the wall from the outside, and the first opening is covered on the periphery of the pressure relief hole, so that the first opening is directly connected to the pressure relief hole.

[0009] According to the battery device provided in some embodiments of the present application, the blocking mechanism includes a piston and an elastic member, the piston is connected to the elastic member, the elastic member is connected to the main body, the piston blocks the first opening under the action of the elastic member, and when the battery cell is thermally runaway, the elastic member deforms to release the piston from blocking the first opening. By connecting the piston to the elastic member and the elastic member to the main body, the elastic member can use its own elastic restoring force to apply a force to the piston, so that the piston can keep blocking the first opening under the action of the elastic member.

[0010] According to the battery device provided in some embodiments of the present application, the main body includes a first part and a second part that are connected to each other, the first part encloses a cavity, the second part is provided with a sealing hole extending axially along the first opening and connected to the cavity, the first opening is arranged at an end of the sealing hole away from the cavity, and the piston is sealingly slidably connected to the sealing hole, so that the piston can achieve sealing and blocking at the first opening by sealing with the inner wall surface of the sealing hole in the radial direction of the sealing hole, so that the elastic member does not need to provide a large force to support the piston to press the first opening, so that when the piston escapes from the sealing hole, it only needs to overcome the friction between the piston and the inner wall surface of the sealing hole and the smaller elastic force of the elastic member, thereby reducing the pressure relief pressure of the pressure relief device, so that the pressure relief device can better discharge the material in the accommodating space.

[0011] According to the battery device provided in some embodiments of the present application, the elastic member extends axially along the first opening and is connected between the piston and the first part, so that the elastic member can use its own elastic force to keep the piston inserted into the sealing hole along the axial direction of the first opening, thereby reducing the possibility of the piston escaping from the sealing hole when the battery cell is not out of control.

[0012] According to the battery device provided in some embodiments of the present application, a sealing ring is sleeved on the outer circumferential surface of the piston, and the sealing ring is clamped between the outer circumferential surface of the piston and the inner wall surface of the sealing hole, so that the sealing ring can improve the sealing effect between the outer circumferential surface of the piston and the inner wall surface of the sealing hole, so that the piston and the sealing hole can perform good radial sealing to achieve blocking of the first opening.

[0013] According to the battery device provided in some embodiments of the present application, the outer circumferential surface of the piston is recessed inward to form an annular groove, and a portion of the sealing ring extends into the annular groove, so that the sealing ring can be positioned in the annular groove, and the sealing ring can be conveniently positioned on the piston through the annular groove, and synchronously extend into the sealing hole with the piston, making assembly convenient.

[0014] According to the battery device provided in some embodiments of the present application, the second part is provided with a connection structure, and the connection structure is connected to the box body, so that the main body of the pressure relief device can be stably connected to the box body.

[0015] According to the battery device provided in some embodiments of the present application, the first part includes a main structure and a cover structure, the main structure encloses a cavity having a second opening, and the cover structure is detachably connected to the main structure and covers the second opening. By making the cover structure detachably connected to the main structure, the first part can be opened by removing the cover structure, so as to maintain and replace the sealing mechanism inside the cavity, thereby improving the convenience of maintenance of the battery device.

[0016] According to the battery device provided in some embodiments of the present application, the main structure and the cover structure are snap-connected, so that the main structure and the cover structure are easy to disassemble, which is beneficial to improving the convenience of disassembly and assembly of the pressure relief device.

[0017] According to the battery device provided in some embodiments of the present application, the sealing mechanism also includes a guide rod, which is connected to the piston and extends along the axial direction of the first opening. The elastic member is sleeved on the outer periphery of the guide rod, so that when the elastic member is stretched or compressed, it can be stretched or compressed along the axial direction of the first opening, so that the elastic member is not easy to deviate from the set direction when stretched or compressed, so that the elastic member can provide a force along the axial direction of the first opening.

[0018] According to the battery device provided in some embodiments of the present application, the guide rod and the piston are an integrally formed structure, which not only enables a greater force to be better transmitted between the guide rod and the piston, but also helps to improve the integrity of the blocking mechanism.

[0019] According to the battery device provided in some embodiments of the present application, the elastic member is connected to the cover structure, and part of the guide rod extends from the cavity through the cover structure, so that the guide rod can extend out of the cavity, so that the user can push the guide rod from the outside to insert the piston into the sealing hole, thereby achieving sealing of the first opening.

[0020] According to the battery device provided in some embodiments of the present application, the cover structure is provided with a through hole which penetrates axially along the first opening, the through hole is provided with a dustproof ring, and the guide rod passes through the dustproof ring and extends from the cavity, so that dust is not easy to enter the cavity through the gap between the guide rod and the through hole, which is not only beneficial to reduce the possibility of dust entering the battery device, but also beneficial to extend the service life of the pressure relief device.

[0021] According to the battery device provided in some embodiments of the present application, the direction of the port of the guide tube away from the cavity is arranged to intersect with the direction of the first opening, which is not only beneficial to reducing the impact force when the discharged material is discharged, but also beneficial to limiting the discharge direction of the discharged material by setting the direction of the port of the guide tube away from the cavity, thereby reducing the possibility of the discharged material contacting the surrounding flammable materials.

[0022] In a second aspect, some embodiments of the present application provide an electrical device, which includes a battery device provided by any of the above technical solutions, and the battery device is used to provide electrical energy.

[0023] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0024] Some embodiments of the present application provide a battery device, which includes a battery cell, a box and a pressure relief device, wherein the box forms a storage space for accommodating the battery cell, and the pressure relief device includes a main body and a blocking mechanism, wherein the main body is connected to the box and forms a storage cavity and a first opening connected to the storage cavity, wherein the first opening is connected to the storage space, and a guide tube is provided on the main body, wherein one end of the guide tube is connected to the storage cavity, and the other end is connected to the outside; the blocking mechanism is provided in the storage cavity to block the first opening and is configured to release the blocking of the first opening when the battery cell is in thermal runaway. In the above structure, since the main body is provided with a guide tube connected to the storage cavity, when the battery cell is in thermal runaway, the discharged material can enter the storage cavity from the storage space through the first opening and be discharged to the outside under the guidance of the guide tube, so that the discharge direction of the discharged material can be limited by the guide tube, and the discharged material is not easy to spray everywhere, which reduces the possibility of the discharged material contacting the surrounding flammable material, and is conducive to improving the reliability of the use of the battery device.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0029] Figure 3 A partial exploded view of a battery device provided in some embodiments of the present application;

[0030] Figure 4 A top view of a pressure relief device in a battery device provided in some embodiments of the present application;

[0031] Figure 5 for Figure 4 Sectional view at the middle BB;

[0032] Figure 6A disassembled diagram of a pressure relief device in a battery device provided in some embodiments of the present application;

[0033] Figure 7 A schematic diagram of the structure of a pressure relief device in a battery device provided in some embodiments of the present application;

[0034] Figure 8 for Figure 7 The enlarged view of point A in the middle;

[0035] Fig. 9 This is a left side view of a pressure relief device in a battery device provided in some embodiments of the present application.

[0036] In the figure:

[0037] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Box; 51. First box; 52. Second box; 53. Accommodating space; 501. Wall; 5011. Pressure relief hole; 6. Battery cell; 7. Pressure relief device; 71. Main body; 711. First part; 7111. Receptacle; 7112. Second opening; 7113. Main structure; 71131. Bayonet hole; 7115. Cover structure; 71151. Buckle; 71152. Through hole; 712. Second part; 7121. Sealing hole; 7122. First opening; 7123. Connecting structure; 713. Guide tube; 72. Sealing mechanism; 721. Piston; 7211. Ring groove; 722. Elastic member; 723. Guide rod; 724. Sealing ring; 73. Sealing pad. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0045] The term “plurality” used in this application refers to two or more (including two).

[0046] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0047] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0048] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0049] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0050] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0051] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0052] In some embodiments, the battery device may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0053] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0054] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0055] In order to make the battery device have good reliability, pressure relief devices such as pressure relief nails and explosion-proof valves are usually installed on the box of the battery device, so that when the pressure in the box exceeds the limit value, the inside of the box can be connected to the outside of the box, so that the leaked substances in the box can be discharged to the outside of the box through the pressure relief device, so as to reduce the pressure inside the box and reduce the possibility of battery explosion. Since the temperature of the leaked substances released when the battery cell is thermally runaway is relatively high, if the leaked substances are randomly sprayed everywhere, it is easy to ignite the surrounding flammable substances, which is not conducive to improving the reliability of the battery device.

[0056] In order to improve the reliability of the battery device, some embodiments of the present application provide a battery device, which includes a battery cell, a box and a pressure relief device, the box forms a storage space for accommodating the battery cell, the pressure relief device includes a main body and a blocking mechanism, the main body is connected to the box and forms a storage cavity and a first opening connected to the storage cavity, the first opening is connected to the storage space, a guide tube is provided on the main body, one end of the guide tube is connected to the storage cavity, and the other end is connected to the outside; the blocking mechanism is arranged in the storage cavity to block the first opening and is configured to release the blocking of the first opening when the battery cell is thermally runaway. In the above structure, since the main body is provided with a guide tube connected to the storage cavity, when the battery cell is thermally runaway, the discharged material can enter the storage cavity from the storage space through the first opening and be discharged to the outside under the guidance of the guide tube, so that the discharge direction of the discharged material can be limited by the guide tube, the discharged material is not easy to spray everywhere, and the possibility of the discharged material contacting the surrounding flammable material is reduced, which is conducive to improving the reliability of the use of the battery device.

[0057] The battery device described in the embodiments of the present application is suitable for use in an electrical device using the battery device.

[0058] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0060] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0061] like Figure 1 As shown, a battery device 2 is disposed inside the vehicle 1, and the battery device 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1.

[0062] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating and driving the vehicle 1 .

[0063] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0064] Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application. Figure 2 As shown, the battery device 2 includes a box body 5 and a battery cell 6, and the battery cell 6 is accommodated in the box body 5. The box body 5 is used to provide a storage space for the battery cell 6. There can be multiple battery cells 6 in the battery device 2, and the multiple battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 6 are both connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 6 is accommodated in the box body 5; of course, the battery device 2 can also be a battery module formed by connecting multiple battery cells 6 in series, in parallel, or in mixed connection, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box body 5.

[0065] The box body 5 may include a first box body 51 and a second box body 52, and the first box body 51 and the second box body 52 cover each other to define a storage space 53 for accommodating the battery cell 6. The first box body 51 and the second box body 52 may be in various shapes, such as a cuboid, a cylinder, etc. The first box body 51 may be a hollow structure with one side open, and the second box body 52 may also be a hollow structure with one side open, and the open side of the second box body 52 covers the open side of the first box body 51, thereby forming a box body 5 with a storage space 53.

[0066] The battery device 2 may further include other structures. For example, the battery device 2 may further include a busbar component for realizing electrical connection between the plurality of battery cells 6 .

[0067] Some embodiments of the present application provide a battery device 2, referring to Figure 3 The battery device 2 includes a battery cell 6, a box 5 and a pressure relief device 7. The box 5 forms a storage space 53 for accommodating the battery cell 6. Figure 4-Figure 6The pressure relief device 7 includes a main body 71 and a blocking mechanism 72. The main body 71 is connected to the box body 5 and forms a cavity 7111 and a first opening 7122 connected to the cavity 7111. A guide tube 713 is provided on the main body 71. One end of the guide tube 713 is connected to the cavity 7111, and the other end is connected to the outside. The blocking mechanism 72 is arranged in the cavity 7111 to block the first opening 7122 and is configured to release the blocking of the first opening 7122 when the battery cell 6 has thermal runaway.

[0068] The battery cell 6 may be the smallest unit capable of charge and discharge. The battery device 2 is usually provided with a plurality of battery cells 6, which are electrically connected as a whole to provide a larger capacity. The electrical connection of the plurality of battery cells 6 may be in series, in parallel or in mixed connection.

[0069] The box body 5 can be the first box body 51 provided by the aforementioned technical solution, or can be the second box body 52 provided by the aforementioned technical solution. Those skilled in the art can select it according to actual conditions so that the pressure relief device 7 is set at a suitable position of the battery device 2.

[0070] The accommodation space 53 is a space formed in the box body 5 for accommodating the battery cell 6. By arranging the battery cell 6 in the accommodation space 53, the battery cell 6 can be protected by the box body 5, reducing the possibility of the battery cell 6 being damaged by collision.

[0071] The pressure relief device 7 can be a mechanism provided on the box body 5 for releasing the internal pressure of the box body 5. When the internal pressure of the box body 5 reaches or exceeds a preset value, the pressure relief device 7 can reduce the internal pressure of the box body 5 by releasing the released material inside the box body 5 to the outside of the box body 5.

[0072] The main body 71 may be a main structural part of the pressure relief device 7, which is used to form a discharge channel to discharge the discharged substances inside the box body 5 to the outside. The cavity 7111 may be a cavity structure formed inside the main body 71, which is used to set the blocking mechanism 72 and form a discharge channel to facilitate the discharge of the discharged substances to the outside. The first opening 7122 may be an opening structure formed on the main body 71 for communicating with the accommodating space 53, which is used to allow the substances in the accommodating space 53 to enter the pressure relief device 7. By connecting the first opening 7122 with the cavity 7111, the substances in the accommodating space 53 that enter the pressure relief device 7 can enter the cavity 7111.

[0073] The guide pipe 713 may be a component for discharging the material in the cavity 7111 to the outside, and it can guide the discharge of the discharged material. By providing the guide pipe 713 on the main body 71, and making one end of the guide pipe 713 connected to the cavity 7111, and the other end connected to the outside, the discharged material entering the cavity 7111 can enter the guide pipe 713 from the port of the guide pipe 713 close to the cavity 7111 and be discharged from the port of the guide pipe 713 connected to the outside. Under the guidance of the guide pipe 713, when the discharged material is discharged to the outside, the discharge direction of the discharged material can be limited by the guide pipe 713, and the discharged material is not easy to be scattered everywhere, which reduces the possibility of the discharged material contacting the surrounding flammable materials.

[0074] The sealing mechanism 72 may be a mechanism for sealing the first opening 7122 . By sealing the first opening 7122 by the sealing mechanism 72 , the accommodating space 53 of the battery cell 6 is a sealed space structure, and the battery cell 6 is not easily affected by external environmental factors, which is beneficial to improving the working stability of the battery cell 6 .

[0075] The sealing mechanism 72 is configured to release the blockage of the first opening 7122 when the battery cell 6 thermally runs away, which may mean that after the battery cell 6 thermally runs away and releases the leaked material into the accommodating space 53, the sealing mechanism 72 can release the blockage of the first opening 7122, so that the first opening 7122 connects the accommodating space 53 with the accommodating cavity 7111, so that the leaked material in the accommodating space 53 can be discharged to the outside through the first opening 7122, the accommodating cavity 7111 and the guide tube 713 in sequence.

[0076] Exemplarily, it may be that after the battery cell 6 thermally runs away and releases the discharged substances into the accommodating space 53, the pressure in the accommodating space 53 rises, and the sealing mechanism 72 releases the blockage of the first opening 7122 under the action of the pressure in the accommodating space 53, so that the discharged substances in the accommodating space 53 can enter the accommodating cavity 7111; it may also be that after the battery cell 6 thermally runs away and releases the discharged substances into the accommodating space 53, the temperature in the accommodating space 53 rises, and the sealing mechanism 72 detects that the temperature in the accommodating space 53 reaches or exceeds the preset temperature and releases the blockage of the first opening 7122, so that the discharged substances in the accommodating space 53 can enter the accommodating cavity 7111.

[0077] In the above structure, since the main body 71 is provided with a guide tube 713 connected to the cavity 7111, when the battery cell 6 thermally runs away, the leaked material can enter the cavity 7111 from the accommodating space 53 through the first opening 7122, and be discharged to the outside under the guidance of the guide tube 713, so that the discharge direction of the leaked material can be limited by the guide tube 713, the leaked material is not easy to spray everywhere, and the possibility of the leaked material contacting the surrounding flammable materials is reduced, which is beneficial to improving the reliability of the use of the battery device 2.

[0078] In some embodiments, the box body 5 includes a wall body 501 , the wall body 501 is provided with a pressure relief hole 5011 penetrating along the thickness direction of the wall body 501 , and the main body 71 is connected to the wall body 501 at the pressure relief hole 5011 .

[0079] The wall body 501 may be a wall structure in the box body 5, which is used to enclose and form the accommodation space 53. The pressure relief hole 5011 may be a hole-shaped structure used to discharge the material in the accommodation space 53 to the outside, and the pressure relief hole 5011 is made to penetrate the wall body 501 along the thickness direction of the wall body 501, so that the pressure relief hole 5011 connects the accommodation space 53 with the outside.

[0080] The main body 71 is connected to the wall body 501 at the pressure relief hole 5011. The main body 71 can be inserted into the pressure relief hole 5011 so that at least part of the main body 71 extends from the pressure relief hole 5011 into the accommodating space 53, so that the first opening 7122 of the main body 71 is connected to the accommodating space 53; or the main body 71 is connected to the outside of the wall body 501 at the pressure relief hole 5011, and the first opening 7122 is connected to the pressure relief hole 5011, so that the first opening 7122 is connected to the accommodating space 53.

[0081] In some embodiments, the main body 71 is connected to the wall 501 from the outside, and the first opening 7122 covers the outer periphery of the pressure relief hole 5011 .

[0082] By connecting the main body 71 to the wall 501 from the outside and sealing the first opening 7122 on the periphery of the pressure relief hole 5011 , the main body 71 can be connected to the wall 501 more conveniently, and the first opening 7122 is directly connected to the pressure relief hole 5011 .

[0083] Exemplarily, the main body 71 can be connected to the wall body 501 at the pressure relief hole 5011 by connecting bolts, connecting pins and other connecting parts, which makes the connection convenient; it can also be connected to the wall body 501 at the pressure relief hole 5011 by welding or bonding, which is beneficial to reduce the possibility of leakage of pressure relief materials.

[0084] In some embodiments, the sealing mechanism 72 includes a piston 721 and an elastic member 722. The piston 721 is connected to the elastic member 722, and the elastic member 722 is connected to the main body 71. The piston 721 blocks the first opening 7122 under the action of the elastic member 722. When the battery cell 6 thermally runs away, the elastic member 722 is deformed to release the piston 721 from blocking the first opening 7122.

[0085] The piston 721 may be a component in the blocking mechanism 72 that directly blocks the first opening 7122. The elastic member 722 may be a component that can exert a force on the piston 721 by its own elastic force, so that the piston 721 keeps blocking the first opening 7122 and is not easy to fall off.

[0086] By connecting the piston 721 to the elastic member 722, and the elastic member 722 to the main body 71, the elastic member 722 can use its own elastic restoring force to apply a force to the piston 721, so that the piston 721 can keep blocking the first opening 7122 under the action of the elastic member 722. When the battery cell 6 thermally runs away, the elastic member 722 deforms to release the piston 721 from blocking the first opening 7122, which may mean that when the battery cell 6 thermally runs away, the pressure in the accommodating space 53 acts on the piston 721, and the piston 721 overcomes the force brought by the elastic member 722, so that the elastic member 722 deforms, and the piston 721 disengages from the first opening 7122, and the first opening 7122 connects the accommodating space 53 with the cavity 7111.

[0087] Exemplarily, the piston 721 blocks the first opening 7122 under the action of the elastic member 722. It can be that a step is provided on the outer periphery of the first opening 7122, and the piston 721 is sealed against the step and blocks the first opening 7122 under the action of the elastic member 722. The pressure in the accommodating space 53 can act on the piston 721, so that the piston 721 overcomes the force brought by the elastic member 722 and disengages from the step, so that the first opening 7122 connects the accommodating space 53 with the accommodating cavity 7111; it can also be that the piston 721 is sealed and inserted into the hole forming the first opening 7122 to block the first opening 7122. The pressure in the accommodating space 53 can act on the piston 721, so that the piston 721 overcomes the force brought by the elastic member 722 and disengages from the hole, so that the first opening 7122 connects the accommodating space 53 with the accommodating cavity 7111.

[0088] The elastic member 722 may be a member capable of elastic deformation. For example, the elastic member 722 may be a spring or an elastic rubber member, so that the elastic member 722 has good elastic force.

[0089] In some embodiments, the main body 71 includes a first part 711 and a second part 712 that are interconnected. The first part 711 encloses a cavity 7111. The second part 712 is provided with a sealing hole 7121 that extends axially along the first opening 7122 and is connected to the cavity 7111. The first opening 7122 is arranged at one end of the sealing hole 7121 away from the cavity 7111, and the piston 721 is sealingly and slidably connected to the sealing hole 7121.

[0090] The first part 711 and the second part 712 may be different parts connected to each other in the main body 71, wherein the first part 711 may be a part that encloses the cavity 7111, and the second part 712 may be a part used to form the first opening 7122. The sealing hole 7121 may be a hole-shaped structure in the second part 712, which is used to form the first opening 7122 that is connected to the cavity 7111. By extending the sealing hole 7121 along the axial direction of the first opening 7122 and connecting with the sealing hole 7121 of the cavity 7111, and using the end of the sealing hole 7121 away from the cavity 7111 as the first opening 7122, the piston 721 can be connected to the sealing hole 7121 through sealing and sliding to block the first opening 7122.

[0091] By sealingly and slidingly connecting the piston 721 to the sealing hole 7121, the piston 721 can seal the first opening 7122 by sealing with the inner wall of the sealing hole 7121 in the radial direction of the sealing hole 7121, so that the elastic member 722 does not need to provide a large force to support the piston 721 to press the first opening 7122, so that when the piston 721 escapes from the sealing hole 7121, it only needs to overcome the friction between the piston 721 and the inner wall of the sealing hole 7121 and the smaller elastic force of the elastic member 722, thereby reducing the pressure relief pressure of the pressure relief device 7, so that the pressure relief device 7 can better discharge the material in the accommodating space 53.

[0092] In some embodiments, the elastic member 722 extends along the axial direction of the first opening 7122 and is connected between the piston 721 and the first portion 711 .

[0093] By extending the elastic member 722 along the axial direction of the first opening 7122 and connecting between the piston 721 and the first part 711, the elastic member 722 can use its own elastic force to keep the piston 721 inserted into the sealing hole 7121 along the axial direction of the first opening 7122, thereby reducing the possibility of the piston 721 escaping from the sealing hole 7121 when the battery cell 6 is not out of control.

[0094] In some embodiments, a sealing ring 724 is sleeved on the outer circumference of the piston 721 , and the sealing ring 724 is sandwiched between the outer circumference of the piston 721 and the inner wall of the sealing hole 7121 .

[0095] The sealing ring 724 may be a member for improving the sealing performance between the piston 721 and the inner wall surface of the sealing hole 7121. By sandwiching the sealing ring 724 between the outer peripheral surface of the piston 721 and the inner wall surface of the sealing hole 7121, the sealing ring 724 can improve the sealing effect between the outer peripheral surface of the piston 721 and the inner wall surface of the sealing hole 7121, so that the piston 721 and the sealing hole 7121 can perform good radial sealing to achieve the blocking of the first opening 7122.

[0096] Exemplarily, the sealing ring 724 may be an elastic sealing ring 724 made of elastic rubber and capable of being squeezed and deformed between the outer peripheral surface of the piston 721 and the inner wall surface of the sealing hole 7121 to seal the gap between the outer peripheral surface of the piston 721 and the inner wall surface of the sealing hole 7121 .

[0097] In some embodiments, the outer circumference of the piston 721 is recessed inward to form an annular groove 7211 , and a portion of the sealing ring 724 extends into the annular groove 7211 .

[0098] The annular groove 7211 may be a recessed portion formed by the outer circumference of the piston 721 being recessed inwardly, and is disposed in an annular shape around the outer circumference of the piston 721, so that a portion of the sealing ring 724 sleeved on the outer circumference of the piston 721 can extend into the annular groove 7211. By extending a portion of the sealing ring 724 into the annular groove 7211, the sealing ring 724 can be positioned in the annular groove 7211, so that the sealing ring 724 can be conveniently positioned on the piston 721 through the annular groove 7211, and synchronously extends into the sealing hole 7121 with the piston 721, so that assembly is convenient.

[0099] In some embodiments, reference Figure 7 The second part 712 is provided with a connecting structure 7123 , and the connecting structure 7123 is connected to the box body 5 .

[0100] The connection structure 7123 may be a structure for connecting the second portion 712 to the box body 5. By connecting the connection structure 7123 to the box body 5, the main body 71 of the pressure relief device 7 can be stably connected to the box body 5.

[0101] Exemplarily, the connection structure 7123 can be a flange structure protruding from the outer peripheral surface of the second part 712. The connection structure 7123 can be connected to the box body 5 by connecting bolts, connecting pins and other connecting parts, and can also be connected to the box body 5 by welding, bonding and other connecting methods. Those skilled in the art can select the connection method between the connection structure 7123 and the box body 5 according to actual conditions.

[0102] In some embodiments, a sealing gasket 73 is provided on the second part 712, and the sealing gasket 73 is arranged around the outer periphery of the first opening 7122 and clamped between the second part 712 and the box body 5. The sealing gasket 73 can seal the gap between the second part 712 and the box body 5, which is beneficial to reduce the possibility of leakage of substances in the accommodating space 53.

[0103] In some embodiments, the first portion 711 includes a main structure 7113 and a cover structure 7115 . The main structure 7113 encloses a cavity 7111 having a second opening 7112 . The cover structure 7115 is detachably connected to the main structure 7113 and covers the second opening 7112 .

[0104] The main structure 7113 and the cover structure 7115 are two interconnected parts of the first part 711 . The main structure 7113 is used to enclose a cavity 7111 having a second opening 7112 . The cover structure 7115 is detachably connected to the main structure 7113 and covers the second opening 7112 .

[0105] The cover structure 7115 is detachably connected to the main structure 7113 and covers the second opening 7112, which may mean that the connection between the cover structure 7115 and the main structure 7113 is detachable, and the cover structure 7115 covers the second opening 7112. By making the cover structure 7115 detachably connected to the main structure 7113, the first part 711 can be opened by removing the cover structure 7115, so that the blocking mechanism 72 inside the cavity 7111 can be maintained and replaced, thereby improving the convenience of maintenance of the battery device 2.

[0106] Exemplarily, the detachable connection between the cover structure 7115 and the main structure 7113 may be a threaded connection, a snap connection, or other detachable connection forms, and those skilled in the art may make the selection according to actual conditions.

[0107] In some embodiments, reference Figure 8 , the main structure 7113 and the cover structure 7115 are snap-connected.

[0108] By snapping the main structure 7113 and the cover structure 7115 together, the main structure 7113 and the cover structure 7115 can be easily disassembled, which is beneficial to improving the convenience of disassembly and assembly of the pressure relief device 7.

[0109] Exemplarily, the main structure 7113 may form a cavity 7111 and a bayonet hole 71131 may be provided on the inner wall surface of a portion close to the second opening 7112, and the cover structure 7115 may be provided with a buckle 71151, which is engaged in the bayonet hole 71131, so that the main structure 7113 and the cover structure 7115 are engaged with each other.

[0110] In some embodiments, the blocking mechanism 72 further includes a guide rod 723 , which is connected to the piston 721 and extends along the axial direction of the first opening 7122 , and the elastic member 722 is sleeved on the outer circumference of the guide rod 723 .

[0111] The guide rod 723 may be a member for guiding the extension and retraction of the elastic member 722. By connecting the guide rod 723 to the piston 721 and extending it along the axial direction of the first opening 7122, the elastic member 722 is sleeved on the outer periphery of the guide rod 723, so that when the elastic member 722 is extended or compressed, it can be extended or compressed along the axial direction of the first opening 7122, so that the elastic member 722 is not easy to deviate from the set direction when it is extended or compressed, so that the elastic member 722 can provide a force along the axial direction of the first opening 7122.

[0112] In some embodiments, the guide rod 723 and the piston 721 are an integrally formed structure.

[0113] The guide rod 723 and the piston 721 can be made by an integral molding processing method such as casting, so that the guide rod 723 and the piston 721 can be manufactured as a whole synchronously, which not only makes the processing and manufacturing of the guide rod 723 and the piston 721 convenient, but also makes the overall structure of the guide rod 723 and the piston 721 have good strength; the guide rod 723 and the piston 721 can be made by machining a whole piece of blank using machining methods such as milling, so that the bracket has lower processing difficulty and processing cost.

[0114] By forming the guide rod 723 and the piston 721 into an integral structure, not only can a greater force be better transmitted between the guide rod 723 and the piston 721 , but the integrity of the blocking mechanism 72 is also improved.

[0115] In some embodiments, the elastic member 722 is connected to the cover structure 7115 , and a portion of the guide rod 723 passes through the cover structure 7115 and extends out of the cavity 7111 .

[0116] The elastic member 722 is connected to the cover structure 7115 , and one end of the elastic member 722 close to the cover structure 7115 is pressed against the inner surface of the cover structure 7115 facing the cavity 7111 , so that the components in the sealing mechanism 72 such as the spring can be removed by removing the cover structure 7115 .

[0117] By partially extending the guide rod 723 from the cavity 7111 through the cover structure 7115, the guide rod 723 can be extended out of the cavity 7111, so that the user can push the guide rod 723 from the outside to insert the piston 721 into the sealing hole 7121, thereby sealing the first opening 7122.

[0118] In some embodiments, the cover structure 7115 is provided with a through hole 71152 penetrating along the axial direction of the first opening 7122 , the through hole 71152 is provided with a dust ring, and the guide rod 723 passes through the dust ring and extends out of the receiving cavity 7111 .

[0119] The through hole 71152 may be a hole-shaped structure opened on the cover structure 7115. By setting the through hole 71152 to penetrate the cover structure 7115 along the axial direction of the first opening 7122, the guide rod 723 passing through the through hole 71152 can move along the axial direction of the first opening 7122 under the guidance of the through hole 71152, so that the piston 721 connected to the guide rod 723 can move along the axial direction of the first opening 7122 more stably.

[0120] The dustproof ring may be a device disposed at the through hole 71152 to reduce the possibility of dust entering the cavity 7111 from the outside through the through hole 71152. By passing the guide rod 723 through the dustproof ring and extending it from the cavity 7111, it is difficult for dust to enter the cavity 7111 from the gap between the guide rod 723 and the through hole 71152, which is not only conducive to reducing the possibility of dust entering the battery device 2, but also conducive to extending the service life of the pressure relief device 7.

[0121] In some embodiments, reference Fig. 9 The direction of the port of the guide tube 713 away from the cavity 7111 intersects with the direction of the first opening 7122 .

[0122] The direction of the port of the guide tube 713 away from the cavity 7111 is arranged to intersect with the direction of the first opening 7122, which may mean that the direction of the port of the guide tube 713 away from the cavity 7111 is arranged at a certain angle to the direction of the first opening 7122, so that the discharged material needs to turn after entering the cavity 7111 from the first opening 7122 before it can be discharged from the guide tube 713 to the outside. This is not only beneficial to reducing the impact force when the discharged material is discharged, but also beneficial to limiting the discharge direction of the discharged material by setting the direction of the port of the guide tube 713 away from the cavity 7111, thereby reducing the possibility of the discharged material contacting the surrounding flammable materials.

[0123] Exemplarily, the direction of the port of the guide pipe 713 away from the cavity 7111 is arranged perpendicular to the direction of the first opening 7122, so that the guide pipe 713 can better reduce the impact force when the discharged substance is discharged.

[0124] Some embodiments of the present application further provide an electrical device, which includes the battery device 2 provided by the above technical solution, and the battery device 2 is used to provide electrical energy.

[0125] According to some embodiments of the present application, Figure 5As shown, the present application provides a battery device 2, which includes a battery cell 6, a box body 5 and a pressure relief device 7. The battery cell 6 is accommodated in a accommodating space 53 formed by the box body 5. The pressure relief device 7 includes a main body 71 and a blocking mechanism 72. The second portion 712 of the main body 71 is connected to the box body 5 and is provided with a sealing hole 7121. The first portion 711 forms a cavity 7111. One end of the sealing hole 7121 is connected to the cavity 7111 and the other end forms a first opening 7122 covering the outer periphery of the pressure relief hole 5011 of the box body 5. The piston 721 in the blocking mechanism 72 is slidably connected to the sealing hole 7121 under the action of the elastic member 722. When the battery cell 6 thermally runs away, the elastic member 722 is deformed to cause the piston 721 to escape from the sealing hole 7121, thereby releasing the blocking of the first opening 7122. A guide tube is provided on the first part 711, one end of the guide tube 713 is connected to the cavity 7111, and the direction of the other end intersects with the direction of the first opening 7122 and is connected to the outside. In the above structure, since the guide tube 713 connected to the cavity 7111 is provided on the main body 71, when the battery cell 6 is thermally runaway, the discharged material can enter the cavity 7111 from the accommodating space 53 through the first opening 7122, and be discharged to the outside under the guidance of the guide tube 713, so that the discharge direction of the discharged material can be limited by the guide tube 713, and the discharged material is not easy to spray everywhere, which reduces the possibility of the discharged material contacting the surrounding flammable materials, which is conducive to improving the reliability of the battery device 2.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; A box body, forming a storage space for storing the battery cells; The pressure relief device comprises a main body and a sealing mechanism, wherein the main body is connected to the box body and forms a cavity and a first opening connected to the cavity, the first opening is connected to the accommodating space, and the main body is provided with a guide tube, one port of the guide tube is connected to the cavity, and the other port is connected to the outside; the sealing mechanism is arranged in the cavity to seal the first opening and is configured to release the blockage of the first opening when the battery cell has thermal runaway.

2. The battery device according to claim 1, characterized in that: The box body comprises a wall body, the wall body is provided with a pressure relief hole penetrating along the thickness direction of the wall body, and the main body is connected to the wall body at the pressure relief hole.

3. The battery device according to claim 2, characterized in that: The main body is connected to the wall from the outside, and the first opening covers the outer periphery of the pressure relief hole.

4. The battery device according to claim 1, characterized in that: The blocking mechanism includes a piston and an elastic member, wherein the piston is connected to the elastic member, and the elastic member is connected to the main body. The piston blocks the first opening under the action of the elastic member, and when the battery cell thermally runs away, the elastic member deforms to release the piston from blocking the first opening.

5. The battery device according to claim 4, characterized in that: The main body includes a first part and a second part which are connected to each other, the first part enclosing the cavity, the second part is provided with a sealing hole extending axially along the first opening and connected to the cavity, the first opening is arranged at one end of the sealing hole away from the cavity, and the piston seal is slidably connected to the sealing hole.

6. The battery device according to claim 5, characterized in that: The elastic member extends along the axial direction of the first opening and is connected between the piston and the first portion.

7. The battery device according to claim 5, characterized in that: The outer peripheral surface of the piston is sleeved with a sealing ring, and the sealing ring is sandwiched between the outer peripheral surface of the piston and the inner wall surface of the sealing hole.

8. The battery device according to claim 7, characterized in that: The outer circumferential surface of the piston is inwardly recessed to form an annular groove, and a portion of the sealing ring extends into the annular groove.

9. The battery device according to claim 5, characterized in that: The second part is provided with a connecting structure, and the connecting structure is connected to the box body.

10. The battery device according to claim 5, characterized in that: The first part includes a main structure and a cover structure. The main structure encloses the cavity having a second opening. The cover structure is detachably connected to the main structure and covers the second opening.

11. The battery device according to claim 10, characterized in that: The main structure and the cover structure are snap-connected.

12. The battery device according to claim 10, characterized in that: The blocking mechanism further includes a guide rod, which is connected to the piston and extends along the axial direction of the first opening, and the elastic member is sleeved on the outer periphery of the guide rod.

13. The battery device according to claim 12, characterized in that: The guide rod and the piston are an integrally formed structure.

14. The battery device according to claim 12, characterized in that: The elastic member is connected to the cover structure, and a portion of the guide rod passes through the cover structure and extends out of the cavity.

15. The battery device according to claim 14, characterized in that: The cover structure is provided with a through hole penetrating along the axial direction of the first opening, the through hole is provided with a dustproof ring, and the guide rod passes through the dustproof ring and extends out of the cavity.

16. The battery device according to claim 1, characterized in that: The direction of the port of the guide tube away from the cavity is arranged to intersect with the direction of the first opening.

17. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 16, wherein the battery device is used to provide electrical energy.

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