Battery device, electric device, and vehicle

Abstract

A battery device (100), an electric device, and a vehicle (1000). The battery device (100) comprises: battery cells (10); an electrical structure (50); a case (20), wherein the case (20) is internally provided with a first accommodating cavity (201) and a second accommodating cavity (202), and at least part of the second accommodating cavity (202) is located above the first accommodating cavity (201) in the direction of gravity; and a one-way valve (30) provided on the case (20), wherein one end of the one-way valve (30) faces the first accommodating cavity (201), the other end of the one-way valve (30) faces the second accommodating cavity (202), and the one-way valve (30) is configured to allow a fluid in the second accommodating cavity (202) to enter the first accommodating cavity (201). The fluid in the second accommodating cavity (202) is discharged to the first accommodating cavity (201) by means of the one-way valve (30), thereby reducing damage to the electrical structure (50) caused by the fluid leaked from a liquid-cooled structure, and reducing damage to the electrical structure (50) caused by high-temperature and high-pressure fumes and gases generated by thermal runaway of the battery cells (10).

Description

Battery device, electric device and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202422155141.2, filed on September 3, 2024, and entitled "Battery device, electric device and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of power battery devices, and in particular relates to a battery device, an electric device and a vehicle. BACKGROUND

[0003] In the current battery device, condensate or other structure leakage or permeation liquid is easily generated in the chamber for storing battery monomers and the chamber for storing electrical structures, thereby causing short circuit and the like.

[0004] Moreover, in the case of thermal runaway of the battery monomer, high-temperature and high-pressure flue gas generated by the thermal runaway is easy to enter the chamber for storing electrical structures, thereby causing the electrical structures to fail, short circuit, and even fire due to high temperature. SUMMARY

[0005] In view of the above problems, the present application provides a battery device, an electric device and a vehicle, which can reduce the risk of failure of electrical structures in the battery device.

[0006] In a first aspect, some embodiments of the present application provide a battery device, comprising:

[0007] a battery monomer; an electrical structure; a box body, the box body being provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity being used for accommodating the battery monomer, the second accommodating cavity being used for accommodating the electrical structure, at least part of the second accommodating cavity being located above the first accommodating cavity; and a one-way valve, which is arranged on the box body, one end of the one-way valve facing the first accommodating cavity, and the other end of the one-way valve facing the second accommodating cavity, the one-way valve being configured to allow fluid in the second accommodating cavity to enter the first accommodating cavity, and the one-way valve being used for preventing fluid in the first accommodating cavity from entering the second accommodating cavity.

[0008] The technical scheme of the embodiment is characterized in that the first accommodating cavity and the second accommodating cavity are arranged to accommodate the battery monomer and the electrical structure respectively, the one-way valve is arranged to enable the fluid in the second accommodating cavity to enter the first accommodating cavity, so that the fluid in the second accommodating cavity is discharged to the first accommodating cavity, thereby reducing the damage of the leaked fluid of the liquid cooling structure to the electrical structure; the one-way valve can also hinder the high-temperature and high-pressure flue gas in the first accommodating cavity from entering the second accommodating cavity, thereby reducing the damage of the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery monomer to the electrical structure; the second accommodating cavity is located outside and above the first accommodating cavity, so that the fluid leaked from the liquid cooling structure can be discharged through the one-way valve, and the negative influence of the electrical structure on the energy density of the battery device is also reduced.

[0009] In some embodiments, the box body includes an upper box body and a lower box body connected to the upper box body, the lower box body is provided with a first accommodating cavity with one end open, and the upper box body covers the open side of the first accommodating cavity; the box body further includes an outer shell provided on the side of the upper box body away from the lower box body, and the outer shell is provided with a second accommodating cavity.

[0010] The technical scheme of the embodiment provides specific structures of some box bodies, so that the upper box body and the lower box body enclose the first accommodating cavity, and the upper box body and the outer shell enclose the second accommodating cavity, to accommodate the battery monomer and the electrical structure respectively; the outer shell and the lower box body are arranged on the two sides of the upper box body respectively, so that the first accommodating cavity and the second accommodating cavity are separated by the upper box body, thereby reducing the mutual interference between the battery monomer and the electrical structure.

[0011] In some embodiments, the one-way valve includes a valve body connected to the upper box body, the valve body is provided with a flow passage and a first flow channel and a second flow channel communicated with the flow passage, the other end of the first flow channel is communicated with the first accommodating cavity, and the other end of the second flow channel is communicated with the second accommodating cavity; the one-way valve further includes a valve core movably connected to the valve body, and the valve core is movable to open or close the first flow channel and / or the second flow channel.

[0012] The technical scheme of the embodiment provides structures of some one-way valves, so that the valve core of the one-way valve is movable relative to the valve body, so that the valve core can open or close the one-way valve, thereby realizing the control of the one-way valve on the flow direction of the fluid.

[0013] In some embodiments, the valve body further includes a sealing surface facing the first accommodating cavity, and the end of the first flow channel communicated with the first accommodating cavity is located on the sealing surface; the valve core includes a sealing part movably connected to the valve body, and the sealing part can abut against the sealing surface to close the first flow channel.

[0014] The technical scheme of the embodiment comprises the following: the valve body comprises a sealing surface facing the first accommodating cavity, and the valve core comprises a sealing part located outside the flow cavity, so that the sealing part can abut against the sealing surface to close the first flow channel, thereby achieving the effect of closing the one-way valve; in the case of thermal runaway of the battery monomer in the first accommodating cavity, the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery monomer can push the sealing part to abut against the sealing surface, so that the one-way valve is closed, thereby preventing the high-temperature and high-pressure flue gas from entering the second accommodating cavity; meanwhile, in the case of fluid leakage in the second accommodating cavity, the leaked fluid can enter the flow cavity through the second flow channel and push the sealing part away from the sealing surface, so as to facilitate the discharge of the fluid in the second accommodating cavity to the first accommodating cavity.

[0015] In some embodiments, the valve body is provided with a limiting structure, and a limiting hole in communication with the flow cavity is formed in the limiting structure; the valve core further comprises a limiting part connected to the sealing part through a connecting part, and the limiting part and the sealing part are located on two sides of the limiting structure respectively, and the maximum width of the limiting part is greater than the inner diameter of the limiting hole.

[0016] In the technical scheme of the embodiment, the valve core comprises a limiting part, so that the displacement of the sealing part is limited by the limiting part, so that the sealing part is not easy to fall off from the valve body, thereby improving the stability of the one-way valve.

[0017] In some embodiments, the limiting hole is located on the side of the flow cavity facing the second accommodating cavity, and the sealing surface is located on the side of the flow cavity facing the first accommodating cavity.

[0018] The technical scheme of the embodiment specifically provides the positional relationship between some limiting holes and sealing surfaces. Since the limiting part is opposite to the limiting hole and the sealing part is opposite to the sealing surface, the relationship between the limiting part and the sealing part is also limited, so that the limiting part can better limit the displacement of the sealing part, thereby better improving the stability of the one-way valve.

[0019] In some embodiments, the side of the valve body facing the first accommodating cavity is provided with a guide groove, and the sealing part is accommodated in the guide groove; at least one third through hole is formed in the sealing part, and the third through hole is opposite to the sealing surface in the moving direction of the valve core.

[0020] In the technical scheme of the embodiment, the third through hole is arranged on the sealing part, and in the case that the sealing part is separated from the sealing surface, the fluid can flow from the flow cavity through the third through hole, so as to facilitate the flow of the fluid from the second accommodating cavity to the first accommodating cavity; meanwhile, the third through hole is opposite to the sealing surface, and in the case that the sealing part abuts against the sealing surface, the sealing surface can close the third through hole, so as to prevent the fluid from entering the third through hole from the flow cavity, thereby improving the sealing performance of the one-way valve.

[0021] In some embodiments, the side of the sealing surface facing the first accommodating cavity is provided with a sealing member surrounding one end of the first flow channel, and the sealing part can abut against the sealing member.

[0022] The technical scheme of the embodiment is characterized in that the sealing member is arranged on the sealing surface, so that the sealing performance of the sealing part against the sealing surface is further improved.

[0023] In some embodiments, the one-way valve comprises a first natural state, and the sealing part opens the first flow channel in the first natural state.

[0024] The technical scheme of the embodiment is characterized in that the one-way valve is in the open state under the influence of its own weight in the natural state, so that the one-way valve can be closed in the case of thermal runaway of the battery monomer and generation of high-temperature and high-pressure flue gas, and the structure of the one-way valve is simplified.

[0025] In some embodiments, the one-way valve further comprises an elastic member, one end of the elastic member is connected to the valve core, and the other end is connected to the valve body, and the deformation direction of the elastic member is the same as the movement direction of the valve body.

[0026] The technical scheme of the embodiment is characterized in that the elastic member is arranged to facilitate the control of the position of the valve body in the natural state by the elastic member; at the same time, the pressure condition required for the opening or closing of the one-way valve is changed by adjusting the stiffness coefficient of the elastic member to meet the needs of different working conditions.

[0027] In some embodiments, the fluid entering the flow passage from the second containing cavity is a liquid; the one-way valve further comprises an expansion member contained in the flow passage, the expansion member is configured to swell by soaking the liquid to resist the inner wall of the flow passage and the sealing part; the elastic member is configured to apply a force to the sealing part in the direction of the sealing surface to make the sealing part resist the sealing surface, and the force applied by the elastic member to the sealing part is smaller than the swelling force of the expansion member.

[0028] The technical scheme of the embodiment is characterized in that the expansion body is arranged, in the case of liquid leakage in the second containing cavity, the leaked liquid can make the expansion body swell and make the sealing part separate from the sealing surface, so as to facilitate the discharge of the liquid in the second containing cavity; at the same time, in the case that there is no liquid leakage in the second containing cavity, the elastic member can make the sealing part resist the sealing surface to separate the first containing cavity and the second containing cavity, and reduce the mutual influence between them.

[0029] In some embodiments, the one-way valve comprises a second natural state, and the sealing part closes the first flow channel in the second natural state, and the sealing part resists the sealing surface.

[0030] The technical scheme of the embodiment is characterized in that the one-way valve is in the closed state under the influence of the elastic member in the natural state, so that the one-way valve can be closed in the natural state to reduce the mutual influence between the first containing cavity and the second containing cavity, and can be opened in the case of liquid leakage in the second containing cavity to facilitate the discharge of the liquid from the second containing cavity, so as to reduce the damage to the electrical structure.

[0031] In some embodiments, the valve body comprises a valve body main body and a fixing member, the valve body main body comprises a base and a fixing portion connected to the base, the base is located in the first accommodating cavity, and the fixing portion penetrates through the upper box body and is located in the second accommodating cavity; the fixing member is connected to the fixing portion, and part of the upper box body is clamped between the fixing member and the base.

[0032] In the technical scheme of the embodiment, the valve body comprises a valve body main body and a fixing member, so that part of the upper box body is clamped between the valve body main body and the fixing member, thereby fixing the check valve on the upper box body.

[0033] In some embodiments, an outer wall of the fixing portion is provided with external threads, and the fixing member is a nut matched with the external threads.

[0034] In the technical scheme of the embodiment, some connection modes of the fixing member and the valve body main body are provided, so as to facilitate the installation and fixation of the check valve.

[0035] In some embodiments, the fixing member is sleeved on the fixing portion, and a sealing groove is formed on one side of the fixing member facing the base; a protruding portion is protruded on one side of the base facing the fixing member, the protruding portion is accommodated in the sealing groove, and the protruding portion abuts against the inner wall of the sealing groove.

[0036] In the technical scheme of the embodiment, the sealing groove is arranged on the fixing member, and the sealing portion is arranged on the base, and the sealing portion is matched with the sealing groove, so as to better improve the sealing performance of the connection position of the fixing member and the valve body main body, and improve the sealing performance of the connection position of the valve body main body and the upper box body.

[0037] In some embodiments, the battery device further comprises a heat exchange assembly arranged in the first accommodating cavity and / or the second accommodating cavity.

[0038] In the technical scheme of the embodiment, the heat exchange assembly is arranged, and the temperature in the first accommodating cavity and / or the second accommodating cavity is controlled through the heat exchange assembly, so as to improve the working efficiency of the battery monomer and the electrical structure; at the same time, the check valve can reduce the damage to the electrical structure caused by the leakage of the heat exchange medium.

[0039] In some embodiments, the bottom of the box body is provided with a liquid discharge valve for allowing the fluid in the first accommodating cavity to flow out of the box body.

[0040] In the technical scheme of the embodiment, the liquid discharge valve is arranged on the box body, so that the fluid in the first accommodating cavity can be discharged out of the box body, thereby reducing the damage of the liquid in the first accommodating cavity to the battery monomer.

[0041] In some embodiments, the liquid discharge valve is a check valve.

[0042] The technical scheme of the embodiment is characterized in that the drain valve is a one-way valve, so that the drain valve can not only drain the fluid in the first containing cavity, but also prevent sundries outside the box from entering the box, thereby reducing the negative impact of the outside environment on the battery monomer.

[0043] In some embodiments, the box further comprises a flow guide structure contained in the first containing cavity, one end of the flow guide structure is directed towards the one-way valve, and the other end of the flow guide structure is directed towards the drain valve, so as to guide the fluid flowing out of the one-way valve to flow to the drain valve.

[0044] The technical scheme of the embodiment is characterized in that the flow guide structure is arranged in the first containing cavity, so that the fluid drained from the second containing cavity through the one-way valve can flow to the drain valve under the guidance of the flow guide structure, thereby reducing the damage that the fluid drained from the second containing cavity may cause to the battery monomer.

[0045] In some embodiments, the drain valve is arranged opposite to the one-way valve, and there is a vacant space between the drain valve and the one-way valve.

[0046] The technical scheme of the embodiment is characterized in that the drain valve and the one-way valve are arranged opposite to each other, and there is no other structure between the drain valve and the one-way valve, so that the fluid drained from the second containing cavity can be quickly drained out of the box through the drain valve, thereby reducing the time for which the fluid drained from the second containing cavity stays in the first containing cavity, and reducing the risk of damage to the battery monomer caused by the fluid drained from the second containing cavity.

[0047] In some embodiments, the battery monomer comprises an electrode terminal, and the battery monomer is contained in the first containing cavity in an inverted manner, so that the electrode terminal is located on the side of the battery monomer away from the second containing cavity.

[0048] The electrode terminal is arranged spaced apart from the inner wall of the opposite box.

[0049] The technical scheme of the embodiment is characterized in that the battery monomer is inverted, so as to reduce the damage that the liquid in the second containing cavity may cause to the battery monomer.

[0050] In a second aspect, some embodiments of the present application also provide a battery device.

[0051] In a third aspect, some embodiments of the present application also provide a vehicle comprising the battery device provided by some embodiments of the first aspect, and the top of the box forms at least part of the floor of the vehicle.

[0052] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0054] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0055] Fig. 2 is an exploded structural schematic diagram of a battery device according to some embodiments of the present application;

[0056] Fig. 3 is an exploded structural schematic diagram of a battery cell according to some embodiments of the present application;

[0057] Fig. 4 is a perspective schematic diagram of a battery device according to some embodiments of the present application;

[0058] Fig. 5 is an exploded structural schematic diagram of a box according to some embodiments of the present application;

[0059] Fig. 6 is a sectional schematic diagram of a battery device according to some embodiments of the present application;

[0060] Fig. 7 is a top view schematic diagram of a one-way valve according to some embodiments of the present application;

[0061] Fig. 8 is a sectional view schematic diagram of the one-way valve in an open state along line A-A in Fig. 7 according to some embodiments of the present application;

[0062] Fig. 9 is a sectional view schematic diagram of the one-way valve in a closed state along line A-A in Fig. 7 according to some embodiments of the present application;

[0063] Fig. 10 is a sectional view schematic diagram of the one-way valve in an open state along line A-A in Fig. 7 according to some other embodiments of the present application;

[0064] Fig. 11 is a sectional view schematic diagram of the one-way valve in a closed state along line A-A in Fig. 7 according to some other embodiments of the present application;

[0065] Fig. 12 is a sectional view schematic diagram of a valve body in the one-way valve according to some embodiments of the present application along line A-A in Fig. 7;

[0066] Fig. 13 is a sectional view schematic diagram of a fixing member in the one-way valve according to some embodiments of the present application along line A-A in Fig. 7.

[0067] The meanings of the marks in the figure are as follows: 1000, vehicle; 100, battery device; 10, battery monomer; 11, shell; 12, end cover; 13, electrode assembly; 14, electrode terminal; 20, box body; 201, first containing cavity; 202, second containing cavity; 21, upper box body; 22, lower box body; 23, outer shell; 30, one-way valve; 31, valve body; 311, flow cavity; 312, first flow channel; 313, second flow channel; 314, sealing surface; 315, limiting structure; 3151, limiting hole; 316, valve body main body; 3161, base; 3162, fixed part; 3163, protruding part; 317, fixing part; 3171, sealing groove; 32, valve core; 321, sealing part; 3211, third through hole; 322, limiting part; 323, connecting part; 33, guide groove; 34, sealing part; 35, elastic part; 36, expansion part; 40, liquid discharge valve; 50, electrical structure; 60, heat exchange assembly; 200, motor; 300, controller. Embodiments of the present application

[0068] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof in the specification and the claims and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0070] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0071] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0073] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0074] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0076] At present, from the development of market situation, the application of power battery device is more and more widely. The power battery device is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery device, the demand of its market is also increasing.

[0077] A battery device generally includes battery cells and an electrical structure for controlling the state of the battery device, and the electrical structure generally includes various control systems (such as a battery state detection system, a charge and discharge control system, etc.) and various electrical elements (such as sensors, relays, connectors, etc.). Among them, the battery cells are accommodated in an energy compartment, and the electrical structure is accommodated in a high-voltage compartment; since the battery cells and the electrical structure will generate relatively high heat during operation, liquid cooling structures are provided in the energy compartment and the battery device compartment.

[0078] Since the volume of the high-voltage compartment is generally small, in the case of damage to the liquid cooling structure, the liquid level of the leaked cooling liquid is easy to rise quickly in the high-voltage compartment and immerse the electrical structure, thereby easily causing the electrical structure to appear short circuit and the like.

[0079] Since the battery cell thermal runaway is easy to produce high-temperature and high-pressure flue gas, the high-temperature and high-pressure flue gas entering the high-voltage compartment is easy to cause the electrical structure to appear short circuit and the like; and since the energy compartment and the high-voltage compartment are generally located in the box in the current battery device, the high temperature caused by the battery cell thermal runaway is also easy to cause negative impact on the electrical structure in the high-voltage compartment, thereby easily causing the failure of the electrical structure.

[0080] Based on the above considerations, in order to reduce the possible damage of the electrical structure in the battery device in the case of cooling liquid leakage and battery cell thermal runaway, a battery device is designed, a first accommodating cavity surrounded by an upper box and a lower box is provided, and the battery cells are arranged in the first accommodating cavity; a second accommodating cavity surrounded by the upper box and a shell is provided, the electrical structure is arranged in the second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are located on both sides of the upper box respectively; a one-way valve is arranged on the upper box, so that the cooling liquid in the second accommodating cavity can enter the first accommodating cavity through the one-way valve, and the high-temperature and high-pressure flue gas in the first accommodating cavity is hindered from entering the second accommodating cavity through the one-way valve.

[0081] In such a battery device, the first accommodating cavity and the second accommodating cavity are separated by the upper box, so as to reduce the negative impact of the heat generated by the battery cell operation or thermal runaway on the electrical structure, reduce the negative impact of the heat generated by the electrical structure thermal runaway on the battery cell, and reduce the negative impact of the electrical structure on the energy density of the battery device; the one-way valve can discharge the fluid in the second accommodating cavity to the first accommodating cavity, thereby reducing the damage of the fluid leaked by the liquid cooling structure to the electrical structure; the one-way valve can also hinder the high-temperature and high-pressure flue gas in the first accommodating cavity from entering the second accommodating cavity, thereby reducing the damage of the high-temperature and high-pressure flue gas generated by the battery cell thermal runaway to the electrical structure; the second accommodating cavity is located outside the lower box and above the lower box, so that the fluid leaked by the liquid cooling structure can be discharged through the one-way valve.

[0082] The battery device disclosed by the embodiments of the present application can be used in a power consumption device using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0083] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for convenience of description.

[0084] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 300 and a motor 200, and the controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0085] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Referring to FIG. 2, FIG. 2 is an exploded view of the battery device 100 provided by some embodiments of the present application. The battery device 100 includes a box 20 and a battery cell 10, and the battery cell 10 is contained in the box 20.

[0087] The box 20 is used to provide a containing space for the battery monomer 10, and the box 20 can adopt various structures. In some embodiments, the box 20 can include an upper box 21 and a lower box 22, the upper box 21 and the lower box 22 are mutually covered, and the upper box 21 and the lower box 22 jointly define a containing space for containing the battery monomer 10. The lower box 22 can be a hollow structure with one end open, and the upper box 21 can be a plate-shaped structure, the upper box 21 covers the open side of the lower box 22, so that the upper box 21 and the lower box 22 jointly define the containing space; the upper box 21 and the lower box 22 can also be hollow structures with one side open, and the open side of the upper box 21 covers the open side of the lower box 22. Of course, the box 20 formed by the upper box 21 and the lower box 22 can have various shapes, such as a cylinder, a cuboid, etc.

[0088] In the battery device 100, the battery monomer 10 can be multiple, and the multiple battery monomers 10 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery monomers 10 are connected in series and in parallel. The multiple battery monomers 10 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery monomers 10 is contained in the box 20; of course, the battery device 100 can also be that the multiple battery monomers 10 are connected in series, in parallel or in a mixed manner to form a battery device 100 module, and then the multiple battery device 100 modules are connected in series, in parallel or in a mixed manner to form a whole, and the whole is contained in the box 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery monomers 10.

[0089] Each battery monomer 10 can be a secondary battery monomer or a primary battery monomer; it can also be a lithium-sulfur battery monomer, a sodium-ion battery monomer or a magnesium-ion battery monomer, but is not limited thereto. The battery monomer 10 can be a cylinder, a flat body, a cuboid or other shapes, etc.

[0090] Referring to FIG. 3, FIG. 3 is an exploded structural schematic view of the battery monomer 10 provided in some embodiments of the present application. The battery monomer 10 refers to the smallest unit constituting the battery device 100. As shown in the figure, the battery monomer 10 includes an end cover 12, a shell 11, an electrode assembly 13 and other functional components.

[0091] The end cover 12 refers to a component that covers the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cover 12 can be adapted to the shape of the shell 11 to fit the shell 11. Optionally, the end cover 12 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 12 is less likely to deform when subjected to extrusion collision, so that the battery cell 10 can have higher structural strength and safety performance can also be improved. The end cover 12 can be provided with functional components such as electrode terminals 14. The electrode terminals 14 can be used to electrically connect with the electrode assembly 13 for output or input of the electrical energy of the battery cell 10. In some embodiments, the end cover 12 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cover 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations. In some embodiments, an insulating member can also be provided on the inner side of the end cover 12, which can be used to isolate the electrical connection member 323 in the shell 11 from the end cover 12 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0092] The shell 11 is a component for fitting the end cover 12 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 13, electrolyte and other components. The shell 11 and the end cover 12 can be independent components, and an opening can be provided on the shell 11, and the end cover 12 is covered on the opening to form the internal environment of the battery cell 10. Without limitation, the end cover 12 and the shell 11 can also be integrated, specifically, the end cover 12 and the shell 11 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 11, the end cover 12 is covered on the shell 11. The shell 11 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 11 can be determined according to the specific shape and size of the electrode assembly 13. The material of the shell 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0093] The electrode assembly 13 is a component in which an electrochemical reaction occurs in the battery cell 10. One or more electrode assemblies 13 can be contained within the case 11. The electrode assembly 13 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 13, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals 14 to form a current loop.

[0094] In a first aspect, with reference to FIGS. 4-6, the embodiments of the present application provide a battery device 100, comprising: a battery cell 10, an electrical structure 50, a box 20, and a one-way valve 30. The box 20 has a first accommodating cavity 201 and a second accommodating cavity 202, the first accommodating cavity 201 is used to accommodate the battery cell 10, and the second accommodating cavity 202 is used to accommodate the electrical structure 50. At least part of the second accommodating cavity 202 is located above the first accommodating cavity 201. The one-way valve 30 is arranged on the box 20, one end of the one-way valve 30 faces the first accommodating cavity 201, and the other end of the one-way valve 30 faces the second accommodating cavity 202. The one-way valve 30 is configured to allow fluid in the second accommodating cavity 202 to enter the first accommodating cavity 201, and the one-way valve 30 is also used to prevent fluid in the first accommodating cavity 201 from entering the second accommodating cavity 202.

[0095] The battery cell 10 refers to the smallest unit that constitutes the battery device 100. The number of battery cells 10 can be one, two, or more.

[0096] The box 20 refers to a structure in the battery device 100 that provides an accommodating space for the battery cell 10. The box 20 also provides a fixing base for the electrical structure 50 or other structures of the battery cell 10. The box 20 can include a frame structure, a box structure, or other structures. The shape of the box 20 can be cuboid, cylindrical, or other shapes.

[0097] The first accommodating cavity 201 is a spatial structure within the box 20, and is used to accommodate the battery cell 10. The first accommodating cavity 201 is surrounded by part of the structure of the box 20. The first accommodating cavity 201 can be a cuboid space, a semi-cylindrical space, a prismatic space, or other shapes. The shape of the first accommodating cavity 201 can also be set according to the shape of the box 20.

[0098] The second accommodating cavity 202 is a space structure in the box 20, and is used for accommodating the electrical structure 50. The electrical structure 50 can include sensors, relays, connectors and the like in the battery device 100, and can also include a battery state detection system and a charging and discharging control system in the battery device 100. The second accommodating cavity 202 is surrounded by part of the structure of the box 20, and can be a cuboid space, a semi-cylindrical space, a prismatic space or other shaped space. The shape of the second accommodating cavity 202 can also be set according to the shape of the box 20.

[0099] At least part of the second accommodating cavity 202 is located above the first accommodating cavity 201, that is, the second accommodating cavity 202 can be completely located above the first accommodating cavity 201, or the second accommodating cavity 202 can be only partially located above the first accommodating cavity 201, and the other part of the second accommodating cavity 202 can be located on the side of the first accommodating cavity 201. In the case of fluid in the second accommodating cavity 202, the fluid can flow to the bottom of the second accommodating cavity 202, so as to flow into the first accommodating cavity 201.

[0100] According to the relative position of the first accommodating cavity 201 and the second accommodating cavity 202, in the case of arranging the first accommodating cavity 201 and the second accommodating cavity 202 along the length direction or the width direction of the box 20, part of the second accommodating cavity 202 can be located above the first accommodating cavity 201, and the other part of the second accommodating cavity 202 can be located on one side of the first accommodating cavity 201 along the length direction or the width direction of the box 20. In the case of arranging the first accommodating cavity 201 and the second accommodating cavity 202 along the height direction or the gravity direction of the box 20, part of the second accommodating cavity 202 can be located above the first accommodating cavity 201, or the second accommodating cavity 202 can be completely located above the first accommodating cavity 201.

[0101] The one-way valve 30 refers to a valve structure that allows medium to flow in one direction and blocks flow in the opposite direction. The one-way valve 30 can be a spring type one-way valve, a gravity type one-way valve, a swing type one-way valve or other types of one-way valves.

[0102] The one-way valve 30 is arranged on the box 20, and can be fixedly connected to the box 20 by welding, bonding or other means, or can be detachably connected to the box 20 by screwing, clamping or other means. One end of the one-way valve 30 is in communication with the first accommodating cavity 201, and the other end of the one-way valve 30 is in communication with the second accommodating cavity 202. The one-way valve 30 can allow the fluid in the second accommodating cavity 202 to flow to the first accommodating cavity 201, and can also block the fluid in the first accommodating cavity 201 from flowing to the second accommodating cavity 202.

[0103] The fluid in the second accommodating cavity 202 can be a liquid, a gas-liquid mixture or a gas; in the case of a liquid or a gas-liquid mixture, the liquid part in the fluid is easy to cause the electrical structure 50 to be short-circuited and cause the electrical structure 50 to fail; in the case of a gas, the gas is easy to cause the gas pressure in the second accommodating cavity 202 to rise, and the rising gas pressure is easy to cause the gas near the electrical structure 50 to be ionized and cause discharge, and the rising gas pressure can also cause mechanical damage to the electrical structure 50; the arrangement of the one-way valve 30 can discharge the fluid in the second accommodating cavity 202 to reduce the damage to the electrical structure 50.

[0104] For example, the fluid flowing from the second accommodating cavity 202 to the first accommodating cavity 201 can be a liquid, which can be cooling liquid leaked into the second accommodating cavity 202 from a liquid cooling system of the battery device 100, or other liquid; at this time, the second accommodating cavity 202 can be located above the first accommodating cavity 201, so that the liquid in the second accommodating cavity 202 can better flow into the first accommodating cavity 201 through the one-way valve 30.

[0105] For example, the fluid flowing from the second accommodating cavity 202 to the first accommodating cavity 201 can also be a gas, which can be high-temperature gas generated by abnormal structure of the electrical structure 50; at this time, the second accommodating cavity 202 can be located below the first accommodating cavity 201, or can be located above the first accommodating cavity 201, so that the gas in the second accommodating cavity 202 can better flow into the first accommodating cavity 201 through the one-way valve 30.

[0106] The arrangement of the one-way valve 30 can make the liquid or gas in the second accommodating cavity 202 be discharged to the first accommodating cavity 201, thereby reducing the damage to the electrical structure 50 in the first accommodating cavity 201; at the same time, in the case that the battery monomer 10 in the first accommodating cavity 201 is in thermal runaway and generates high-temperature and high-pressure flue gas, the one-way valve 30 can also hinder the high-temperature and high-pressure flue gas from entering the second accommodating cavity 202, thereby playing a role in protecting the electrical structure 50.

[0107] Because the space of the second accommodating cavity 202 is usually small, in the case of leakage of the cooling liquid of the liquid cooling system into the second accommodating cavity 202, the liquid level of the cooling liquid in the second accommodating cavity 202 is prone to quickly rise and immerse the electrical structure 50. Accordingly, in the present embodiment, the one-way valve 30 is arranged to enable the fluid in the second accommodating cavity 202 to enter the first accommodating cavity 201, so as to facilitate the discharge of the fluid in the second accommodating cavity 202 to the first accommodating cavity 201, thereby reducing the damage of the fluid leaked from the liquid cooling structure to the electrical structure 50; the one-way valve 30 can also hinder the high-temperature and high-pressure flue gas in the first accommodating cavity 201 from entering the second accommodating cavity 202, thereby reducing the damage of the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery cell 10 to the electrical structure 50; the second accommodating cavity 202 is located outside and above the first accommodating cavity 201, so that the fluid leaked from the liquid cooling structure can be discharged under the action of gravity through the one-way valve 30.

[0108] Referring to FIGS. 4-6, in some embodiments, the box 20 includes an upper box 21 and a lower box 22 connected to the upper box 21, the lower box 22 is provided with a first accommodating cavity 201 with one end open, and the upper box 21 covers the open side of the first accommodating cavity 201; the box 20 further includes an outer shell 23 provided on the side of the upper box 21 away from the lower box 22, and the outer shell 23 is provided with a second accommodating cavity 202.

[0109] The upper box 21 and the lower box 22 are part of the structure of the box 20, and the upper box 21 and the lower box 22 can jointly define a space for accommodating the battery cell 10; the upper box 21 can be directly covered and connected to the lower box 22, or indirectly connected to the lower box 22 through an intermediate structure; the upper box 21 can be fixedly connected to the lower box 22 by welding, bonding or other means, or can be detachably connected to the lower box 22 by clamping, screwing or the like.

[0110] The lower box 22 is provided with a first accommodating cavity 201 with one end open, that is, the lower box 22 can be a hollow structure with one end open to accommodate part or all of the structure of the battery cell 10; the first accommodating cavity 201 can be a cuboid space, a semicylindrical space, a prismatic space or other shaped space; the shape of the lower box 22 can be cuboid, cylindrical or other shape; the material of the lower box 22 can include metal, plastic or other materials.

[0111] The upper box 21 can be a hollow structure with one end open to accommodate part or all of the structure of the battery cell 10, or the upper box 21 can be a plate-shaped structure; the shape of the upper box 21 can be cuboid, cylindrical or other shape; the material of the upper box 21 can include metal, plastic or other materials, and the material of the upper box 21 can be the same as or different from that of the lower box 22.

[0112] The upper box body 21 is covered on the opening side of the first accommodating cavity 201 and connected to the lower box body 22 to separate the first accommodating cavity 201 from the outside. According to the opening direction of the first accommodating cavity 201, the upper box body 21 can be located above the lower box body 22 and covered on the lower box body 22.

[0113] The shell 23 refers to part of the structure of the box body 20. The shell 23 can be prismatic, cylindrical, stepped or other shapes. The shell 23 is arranged on the upper box body 21. The shell 23 can be fixedly connected to the upper box body 21 by welding, bonding or other means, or can be detachably connected to the upper box body 21 by screwing, clamping or other means. The material of the shell 23 can include metal, plastic or other materials. The material of the shell 23 can be the same as or different from that of the upper box body 21.

[0114] The shell 23 is arranged on the side of the upper box body 21 away from the lower box body 22, i.e. the shell 23 is arranged on the side of the upper box body 21 away from the first accommodating cavity 201, and the shell 23 is located outside the first accommodating cavity 201.

[0115] The second accommodating cavity 202 can be a space surrounded by the shell 23 and the upper box body 21, or a space arranged in the shell 23. The shape of the second accommodating cavity 202 can be a prismatic space, a cylindrical space or other shaped space, and the shape of the second accommodating cavity 202 can also be set according to the shape of the shell 23. The first accommodating cavity 201 and the second accommodating cavity 202 are located on both sides of the upper box body 21, i.e. the upper box body 21 can separate the first accommodating cavity 201 and the second accommodating cavity 202, thereby reducing the mutual interference between the battery monomer 10 and the electrical structure 50. At the same time, arranging the second accommodating cavity 202 outside the first accommodating cavity 201 can also reduce the occupation of the installation space of the battery monomer 10 by the electrical structure 50, thereby reducing the negative impact on the energy density of the battery device 100.

[0116] It can be understood that the specific position of the shell 23 on the upper box body 21 can be set according to the structure of the corresponding vehicle 1000, so as to reasonably utilize the space of the vehicle 1000, so that the arrangement of the shell 23 on the upper box body 21 away from the lower box body 22 can not only improve the energy density of the battery device 100, but also reduce the occupation of the installation space of the vehicle 1000.

[0117] In the current battery device 100, the battery cell 10 and the electrical structure 50 are usually arranged in the same space and separated by a partition structure, which results in that the electrical structure 50 occupies part of the accommodation space of the battery cell 10 and reduces the energy density of the battery device 100; in the embodiment, the housing 23 and the second accommodation cavity 202 outside the first accommodation cavity 201 are arranged to provide an independent accommodation space for the electrical structure 50, thereby reducing the negative impact of the electrical structure 50 on the energy density of the battery device 100.

[0118] The embodiment provides specific structures of the box 20, so that the upper box 21 and the lower box 22 enclose the first accommodation cavity 201, and the upper box 21 and the housing 23 enclose the second accommodation cavity 202 to accommodate the battery cell 10 and the electrical structure 50 respectively; the housing 23 and the lower box 22 are arranged on the two sides of the upper box 21 respectively, so as to separate the first accommodation cavity 201 and the second accommodation cavity 202 through the upper box 21, thereby reducing the mutual interference between the battery cell 10 and the electrical structure 50.

[0119] Referring to FIGS. 7-9, in some embodiments, the one-way valve 30 includes a valve body 31 and a valve core 32. The valve body 31 is connected to the upper box 21, and a flow cavity 311, a first flow channel 312 and a second flow channel 313 are formed in the valve body 31. The first flow channel 312 is in communication with the flow cavity 311 and the first accommodation cavity 201, and the second flow channel 313 is in communication with the flow cavity 311 and the second accommodation cavity 202. The valve core 32 is movably connected to the valve body 31, and the valve core 32 can open or close the first flow channel 312 and / or the second flow channel 313.

[0120] The valve body 31 refers to the main structure of the one-way valve 30, and the valve body 31 is used to provide a fixed basis for the valve core 32 or other structures of the one-way valve 30. The shape of the valve body 31 can be cylindrical, prismatic or other shapes. The material of the valve body 31 can include metal, plastic or other materials.

[0121] The valve body 31 is connected to the upper box body 21, and can be fixedly connected to the upper box body 21 by welding, bonding or other means, or can be detachably connected to the upper box body 21 by screwing, clamping or other means. The valve body 31 can be connected to the side of the upper box body 21 facing the lower box body 22, that is, the valve body 31 can be completely accommodated in the first accommodating cavity 201, at this time the position of the upper box body 21 opposite to the valve body 31 should be provided with a through hole to facilitate the flow of fluid; the valve body 31 can also be connected to the side of the upper box body 21 facing the shell 23, that is, the valve body 31 can also be completely accommodated in the second accommodating cavity 202, at this time the position of the upper box body 21 opposite to the valve body 31 should be provided with a through hole to facilitate the flow of fluid; the valve body 31 can also be provided through the upper box body 21, that is, part of the valve body 31 can extend into the first accommodating cavity 201, and the other part can extend into the second accommodating cavity 202.

[0122] The flow passage 311 refers to the space structure in the valve body 31 for the flow of fluid, and can be a cylindrical space, a prismatic space or other shaped space; the first flow channel 312 and the second flow channel 313 are both channel structures in the valve body 31 for the flow of fluid, and can be straight channels or curved channels extending along a reference straight line, and the cross-sectional shape of the first flow channel 312 and the second flow channel 313 along the radial direction thereof can be circular, square or other shapes.

[0123] The first flow channel 312 and the second flow channel 313 are both in communication with the flow passage 311, one end of the first flow channel 312 is in communication with the flow passage 311, and the other end is in communication with the first accommodating cavity 201, one end of the second flow channel 313 is in communication with the flow passage 311, and the other end is in communication with the second accommodating cavity 202, so that the fluid in the second accommodating cavity 202 can flow into the first accommodating cavity 201 in sequence through the second flow channel 313, the flow passage 311 and the first flow channel 312.

[0124] The fluid can flow for a long distance in the first flow channel 312, at this time the first flow channel 312 can be a channel structure, or the fluid can flow for a short distance in the first flow channel 312, at this time the first flow channel 312 can be a hole structure; similarly to the first flow channel 312, the second flow channel 313 can be a channel structure or a hole structure.

[0125] The flow passage 311, the first flow channel 312 and the second flow channel 313 can be different parts of the same flow channel, or can be different flow channels or cavities in communication with each other.

[0126] The flow passage 311 can be used for temporarily storing part of the fluid in addition to allowing the fluid to flow therethrough. For example, after the fluid in the second accommodating cavity 202 enters the flow passage 311 through the second flow channel 313, the fluid can be temporarily stored in the flow passage 311 to reduce the amount of fluid accumulated in the second accommodating cavity 202 and reduce damage to the electrical structure 50. Meanwhile, the temporary storage of fluid in the flow passage 311 can also increase the pressure of the fluid on the valve core 32.

[0127] The valve core 32 refers to a structure in the one-way valve 30 for controlling the opening or closing of the one-way valve 30. The valve core 32 can include a plate-shaped structure, a columnar structure, or other shapes. The material of the valve core 32 can include metal, plastic, or other materials.

[0128] The valve core 32 is movably arranged on the valve body 31, and the movement of the valve core 32 relative to the valve body 31 can open or close the first flow channel 312 and / or the second flow channel 313, i.e., the movement of the valve core 32 can control the opening or closing of the one-way valve 30. The movement of the valve core 32 can only open or close the first flow channel 312 or the second flow channel 313, or can simultaneously open or close the first flow channel 312 and the second flow channel 313.

[0129] For example, the valve core 32 can be arranged on one side of the first flow channel 312 so that the movement of the valve core 32 can open or close the first flow channel 312. The valve core 32 can move axially relative to the valve body 31 along the first flow channel 312, or can move radially relative to the valve body 31 along the first flow channel 312. The valve core 32 can also have other movement directions to open or close the first flow channel 312. For example, the valve core 32 can also be arranged on one side of the second flow channel 313 so that the movement of the valve core 32 can open or close the second flow channel 313. The valve core 32 can move axially relative to the valve body 31 along the second flow channel 313, or can move radially relative to the valve body 31 along the second flow channel 313. The valve core 32 can also have other movement directions to open or close the second flow channel 313. For example, the valve core 32 can also be arranged in the flow passage 311 so that the movement of the valve core 32 can simultaneously open or close the first flow channel 312 and the second flow channel 313.

[0130] The valve core 32 can be pushed by fluid to move, or the controller can control the movement of the valve core 32, and the controller can include an electric cylinder, a pneumatic cylinder or other structures. For example, when fluid is generated in the second containing cavity 202, the fluid in the second containing cavity 202 can push the valve core 32 to move to open the one-way valve 30, so that the fluid can flow from the second containing cavity 202 to the first containing cavity 201. When fluid is generated in the first containing cavity 201, the fluid in the first containing cavity 201 can push the valve core 32 to move to close the one-way valve 30, so that the fluid is difficult to flow from the first containing cavity 201 to the second containing cavity 202. For example, when the valve core 32 is controlled by the controller, the controller can include sensors arranged in the first containing cavity 201 and the second containing cavity 202 respectively, and the sensors are used to detect the fluid condition in the first containing cavity 201 and the second containing cavity 202. The controller can control the movement of the valve core 32 according to the detection information of the sensors to open or close the one-way valve 30.

[0131] The embodiment provides some structures of the one-way valve 30, so that the valve core 32 of the one-way valve 30 can move relative to the valve body 31, so that the valve core 32 can open or close the one-way valve 30, thereby realizing the control of the one-way valve 30 on the fluid flow direction.

[0132] Referring to FIGS. 7-9, in some embodiments, the valve body 31 further includes a sealing surface 314 facing the first containing cavity 201, and one end of the first flow channel 312 communicating with the first containing cavity 201 is located on the sealing surface 314; the valve core 32 includes a sealing part 321 movably connected to the valve body 31, and the sealing part 321 can abut against the sealing surface 314 to close the first flow channel 312.

[0133] The sealing surface 314 refers to the surface of the valve body 31 facing the first containing cavity 201; the sealing surface 314 can be a plane or a curved surface; the shape of the sealing surface 314 can be square, circular or other shapes, and the shape of the sealing surface 314 can be set according to the shape of the valve body 31.

[0134] The sealing part 321 refers to the structure of the valve core 32 for closing the first flow channel 312; the sealing part 321 can be a plate structure, a columnar structure or other structures; the sealing part 321 is movably arranged on the valve body 31, and the sealing part 321 can move along the radial direction of the first flow channel 312, or along the axial direction of the first flow channel 312, or along other directions.

[0135] It can be understood that according to the movement direction of the sealing part 321, the valve body 31 can be provided with a guide structure such as a sliding groove or a sliding rail to limit the displacement of the sealing part 321, so that the sealing part 321 can move relative to the valve body 31, and is not easy to fall off to cause the one-way valve 30 to fail.

[0136] The first flow channel 312 is connected to the first accommodating cavity 201 at one end of the sealing surface 314. The sealing part 321 is movable relative to the valve body 31 and can abut against the sealing surface 314 to close the first flow channel 312. At this time, the fluid in the first accommodating cavity 201 is blocked by the sealing part 321 and is difficult to enter the first flow channel 312. The sealing part 321 is movable relative to the valve body 31 and can be spaced from the sealing surface 314. The sealing part 321 is movable relative to the valve body 31 and can be staggered with the first flow channel 312 at one end of the sealing surface 314 to open the first flow channel 312. At this time, the fluid in the second accommodating cavity 202 can flow into the first accommodating cavity 201 through the second flow channel 313, the flow-through cavity 311 and the first flow channel 312.

[0137] Since the sealing surface 314 is located on the side of the valve body 31 facing the first accommodating cavity 201, and the sealing part 321 abuts against the sealing surface 314, the sealing part 321 is located outside the flow-through cavity 311 and on the side of the sealing surface 314 facing the first accommodating cavity 201. At this time, the fluid in the first accommodating cavity 201 flowing to the first flow channel 312 will push the sealing part 321 to abut against the sealing surface 314, so that the fluid in the first accommodating cavity 201 is not easy to enter the first flow channel 312, and the fluid in the second accommodating cavity 202 flowing into the first flow channel 312 through the second flow channel 313 and the flow-through cavity 311 can push the sealing part 321 away from the sealing surface 314 to open the first flow channel 312, so that the fluid can enter the first accommodating cavity 201.

[0138] For example, in the case of thermal runaway of the battery monomer 10 in the first accommodating cavity 201, the high-temperature and high-pressure smoke generated by thermal runaway can push the sealing part 321 to abut against the sealing surface 314, thereby preventing the high-temperature and high-pressure smoke from entering the first flow channel 312. In the case of leakage of cooling liquid in the second accommodating cavity 202, the cooling liquid can flow into the first flow channel 312 through the second flow channel 313 and the flow-through cavity 311. The cooling liquid in the first flow channel 312 can push the sealing part 321 away from the sealing surface 314, so that the cooling liquid can enter the first accommodating cavity 201.

[0139] It can be understood that the shape of the surface opposite to the sealing part 321 and the sealing surface 314 matches the shape of the sealing surface 314, so that the sealing part 321 can better fit the sealing surface 314, thereby improving the sealing effect of the sealing part 321 and reducing the overflow of fluid between the sealing part 321 and the sealing surface 314.

[0140] In the embodiment, the valve body 31 comprises a sealing surface 314 facing the first accommodating cavity 201, and the valve core 32 comprises a sealing part 321, so that the sealing part 321 can abut against the sealing surface 314 to close the first flow channel 312, thereby achieving the effect of closing the one-way valve 30; in the case of thermal runaway of the battery monomer 10 in the first accommodating cavity 201, the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery monomer 10 can push the sealing part 321 to abut against the sealing surface 314, so that the one-way valve 30 is closed, thereby preventing the high-temperature and high-pressure flue gas from entering the second accommodating cavity 202; at the same time, in the case of fluid leakage in the second accommodating cavity 202, the leaked fluid can enter the flow cavity 311 through the second flow channel 313, and can push the sealing part 321 to separate from the sealing surface 314, so as to facilitate the fluid in the second accommodating cavity 202 to be discharged to the first accommodating cavity 201.

[0141] Referring to FIGS. 7-9, in some embodiments, the valve body 31 is provided with a limiting structure 315, and the limiting structure 315 is provided with a limiting hole 3151 in communication with the flow cavity 311; the valve core 32 further comprises a limiting part 322, and the limiting part 322 is connected to the sealing part 321 through a connecting part 323. The limiting part 322 and the sealing part 321 are located on two sides of the limiting structure 315 respectively, and the maximum width of the limiting part 322 is greater than the inner diameter of the limiting hole 3151.

[0142] The limiting structure 315 refers to a structure arranged in the valve body 31 for limiting displacement of the valve core 32. The limiting structure 315 can be an independent structure connected to the valve body 31, or the limiting structure 315 can be a part of the valve body 31 and be integrally formed with the valve body 31. The limiting structure 315 can be located on the outer wall of the valve body 31 or inside the valve body 31, for example, the limiting structure 315 can also be located inside the flow cavity 311. The limiting structure 315 can be a plate-shaped structure, a block-shaped structure or other shaped structures. The material of the limiting structure 315 can include metal, plastic or other materials, and the material of the limiting structure 315 can be the same as or different from the material of the valve body 31.

[0143] The limiting hole 3151 refers to a hole structure arranged on the limiting structure 315. The limiting hole 3151 can be a square hole, a round hole or other shaped hole structures. The limiting hole 3151 can be a straight hole, a stepped hole, a tapered hole or other shaped hole structures. The limiting hole 3151 and the first flow channel 312 can be located on different sides of the flow cavity 311 or on the same side of the flow cavity 311.

[0144] The limiting part 322 refers to a structure arranged in the valve core 32 for limiting displacement of the valve core 32. The limiting part 322 is located on one side of the flow cavity 311 with the limiting structure 315. The limiting part 322 can be cylindrical, plate-shaped, circular truncated cone-shaped or other shapes. The material of the limiting part 322 can include metal, plastic or other materials.

[0145] The connecting portion 323 refers to a structure in the valve core 32 for connecting the limiting portion 322 and the sealing portion 321, that is, the two ends of the connecting portion 323 can be connected to the limiting portion 322 and the sealing portion 321 respectively; the connecting portion 323 can be a flexible member such as a rope, or can be a cylindrical structural member, a prismatic structural member or other rigid structural member of other shapes; the connecting portion 323 and the limiting portion 322, and the connecting portion 323 and the sealing portion 321 can be integrally formed, or can be connected by adhesion, screwing or other ways; the material of the connecting portion 323 can include metal, plastic or other materials.

[0146] The limiting portion 322 and the sealing portion 321 are respectively located on the two sides of the limiting structure 315, so that the movement of the sealing portion 321 can drive the limiting portion 322 to move synchronously through the connecting portion 323, and the limiting portion 322 will abut against the limiting structure 315 after moving a certain distance, thereby being able to limit the further movement of the sealing portion 321.

[0147] For example, the limiting structure 315 can be a part of the valve body 31 and be arranged on the side of the valve body 31 facing the second containing cavity 202, at this time the limiting portion 322 can be located outside the valve body 31 and in the second containing cavity 202, and the connecting portion 323 can pass through the limiting hole 3151, the flow-through cavity 311 and the first flow channel 312 to connect the limiting portion 322 and the sealing portion 321; one end of the connecting portion 323 is connected to the limiting portion 322 outside the valve body 31, and the other end of the connecting portion 323 can pass through the limiting hole 3151, the flow-through cavity 311 and the first flow channel 312 in sequence and be connected to the sealing portion 321; further, the other end of the limiting hole 3151 communicates with the second containing cavity 202, so that the fluid in the first containing cavity 201 can only enter the flow-through cavity 311 through the first fluid, but it is difficult to enter the flow-through cavity 311 through the limiting hole 3151; at the same time, the fluid in the second containing cavity 202 can enter the flow-through cavity 311 through the second flow channel 313, or enter the flow-through cavity 311 through the limiting hole 3151, so as to more quickly discharge the fluid in the second containing cavity 202.

[0148] For example, the limiting structure 315 can also be an independent member and be located inside the flow-through cavity 311, at this time the limiting portion 322 can be located inside the flow-through cavity 311, and the connecting portion 323 can pass through the limiting hole 3151, part of the flow-through cavity 311 and the first flow channel 312 to connect the limiting portion 322 and the sealing portion 321; one end of the connecting portion 323 is connected to the limiting portion 322 inside the flow-through cavity 311, and the other end of the connecting portion 323 can pass through the limiting hole 3151, part of the flow-through cavity 311 and the first flow channel 312 in sequence and be connected to the sealing portion 321.

[0149] The maximum width of the limiting portion 322 is greater than the inner diameter of the limiting hole 3151, so that the limiting portion 322 is difficult to enter the limiting hole 3151; at this time, under the action of the limiting portion 322 and the connecting portion 323, the sealing portion 321 is not easy to fall off the valve body 31, thereby improving the stability of the one-way valve 30.

[0150] When the fluid (for example, cooling liquid) in the second containing cavity 202, the fluid pushes the sealing portion 321 away from the sealing surface 314 through the second flow channel 313, the flow passage 311 and the first flow channel 312; at this time, the sealing portion 321 pulls the limiting portion 322 against the limiting structure 315 through the connecting portion 323, so that the sealing portion 321 is not easy to fall off the valve body 31.

[0151] When the fluid (for example, high-temperature and high-pressure flue gas) in the first containing cavity 201, the fluid can hold the sealing portion 321 against the sealing surface 314 and close the first flow channel 312; at this time, if the connecting portion 323 is a rigid structural member, the sealing portion 321 can also push the limiting portion 322 away from the limiting structure 315 through the connecting portion 323, and if the connecting portion 323 is a flexible structural member, the sealing portion 321 is not easy to affect the position of the limiting portion 322.

[0152] In the embodiment, the valve core 32 includes the limiting portion 322, so as to limit the displacement of the sealing portion 321 through the limiting portion 322, so that the sealing portion 321 is not easy to fall off the valve body 31, thereby improving the stability of the one-way valve 30.

[0153] Referring to FIGS. 7-9, in some embodiments, the limiting hole 3151 is located on the side of the flow passage 311 facing the second containing cavity 202, and the sealing surface 314 is located on the side of the flow passage 311 facing the first containing cavity 201.

[0154] The sealing surface 314 is located on the side of the flow passage 311 facing the first containing cavity 201, that is, the first flow channel 312 is also located on the side of the flow passage 311 facing the first containing cavity 201, and the limiting hole 3151 is located on the side of the flow passage 311 facing the second containing cavity 202; in the case that the fluid in the second containing cavity 202 enters the flow passage 311 and pushes the sealing portion 321 away from the sealing surface 314, the limiting portion 322 can better limit the displacement of the sealing surface 314 through the connecting portion 323, thereby better preventing the sealing portion 321 from falling off the valve body 31.

[0155] In the example, in the case that the second accommodating cavity 202 is located above the first accommodating cavity 201 along the direction of gravity, the sealing surface 31 can be located below the flow cavity 311 along the direction of gravity, that is, the first flow channel 312 is also located below the flow cavity 311, and the limiting hole 3151 can be located above the flow cavity 311 along the direction of gravity, so that the sealing part 321 is difficult to be separated from the valve body 31 when the sealing part 321 is separated from the sealing surface 314 under the action of gravity or the fluid in the first accommodating cavity 201.

[0156] The embodiment specifically provides the positional relationship of some limiting holes 3151 and sealing surfaces 314. The limiting part 322 is opposite to the limiting hole 3151, and the sealing part 321 is opposite to the sealing surface 314. The arrangement also limits the relationship between the limiting part 322 and the sealing part 321, so that the limiting part 322 can better limit the displacement of the sealing part 321, thereby better improving the stability of the one-way valve 30.

[0157] Referring to FIGS. 7-9, in some embodiments, the valve body 31 is provided with a guide groove 33 on the side facing the first accommodating cavity 201, and the sealing part 321 is accommodated in the guide groove 33. At least one third through hole 3211 is formed in the sealing part 321, and the third through hole 3211 is opposite to the sealing surface 314 in the movement direction of the valve core 32.

[0158] The guide groove 33 refers to a groove structure provided on the valve body 31, and the guide groove 33 is used to guide the movement direction of the sealing part 321. The guide groove 33 is provided on the side of the valve body 31 facing the first accommodating cavity 201, and the sealing surface 314 can be the bottom surface of the guide groove 33. The guide groove 33 can be a square groove, a circular groove or other groove structures.

[0159] The axial direction of the guide groove 33 is consistent with the movement direction of the sealing part 321, so that the sealing part 321 can move along the axial direction of the guide groove 33. In the example, the axial direction of the guide groove 33 can be parallel to the direction of gravity and perpendicular to the sealing surface 314.

[0160] The third through hole 3211 refers to a hole structure formed in the sealing part 321. The number of third through holes 3211 can be one, two or more. The third through hole 3211 can be a square hole, a circular hole or other hole structures. The third through hole 3211 can be a straight hole, a stepped hole, a tapered hole or other hole structures.

[0161] The third through hole 3211 is used for fluid flow when the sealing part 321 is separated from the sealing surface 314, so that the fluid can be discharged from the second containing cavity 202 faster; the third through hole 3211 is opposite to the sealing surface 314, and when the sealing part 321 abuts against the sealing surface 314, the third through hole 3211 is closed by the sealing surface 314, so that the fluid is difficult to flow into the first flow channel 312 through the third through hole 3211, thereby enabling the sealing part 321 to close the first flow channel 312.

[0162] Because the guide groove 33 is used for guiding the movement direction of the sealing part 321, the side wall of the sealing part 321 should abut against the inner wall of the guide groove 33 or have a small gap with the inner wall of the guide groove 33, and at this time, the fluid discharge efficiency from the flow passage 311 is low when the sealing part 321 is separated from the sealing surface 314.

[0163] Accordingly, the third through hole 3211 is arranged on the sealing part 321 in the embodiment, and the fluid can flow from the flow passage 311 through the third through hole 3211 when the sealing part 321 is separated from the sealing surface 314, so as to facilitate the fluid flow from the second containing cavity 202 to the first containing cavity 201; meanwhile, the third through hole 3211 is opposite to the sealing surface 314, and the sealing surface 314 can close the third through hole 3211 when the sealing part 321 abuts against the sealing surface 314, so as to hinder the fluid from the flow passage 311 into the third through hole 3211, thereby improving the sealing performance of the one-way valve 30.

[0164] Referring to FIGS. 7-9, in some embodiments, the sealing surface 314 is provided with a sealing member 34 surrounding one end of the first flow channel 312 on the side facing the first containing cavity 201, and the sealing part 321 can abut against the sealing member 34.

[0165] The sealing member 34 refers to a structure for filling the gap between the sealing surface 314 and the sealing part 321 when the sealing part 321 abuts against the sealing surface 314, and the sealing member 34 surrounds one end of the first flow channel 312, that is, the sealing member 34 surrounds one end of the first flow channel 312 on the sealing surface 314; when the sealing part 321 abuts against the sealing surface 314, the sealing part 321 can also abut against the sealing member 34, and at this time, a space isolated from the first containing cavity 201 can be formed between the sealing surface 314, the sealing member 34 and the sealing part 321, so as to improve the sealing performance of the sealing part 321.

[0166] When the sealing portion 321 abuts against the sealing member 34, the sealing member 34 can be deformed to better fill the gap between the sealing portion 321 and the sealing member 34 and between the sealing member 34 and the sealing surface 314, thereby improving the sealing performance. Accordingly, the material of the sealing member 34 can include rubber or other elastic materials.

[0167] The sealing member 34 surrounds one end of the first flow channel 312 on the sealing surface 314, and thus the sealing member 34 can have a circular ring structure, a square ring structure, or other ring structures.

[0168] The sealing member 34 can be fixedly connected to the sealing surface 314 by welding, bonding, or the like, or can be detachably connected to the sealing surface 314 by screwing, clamping, or the like.

[0169] In this embodiment, the sealing member 34 is arranged on the sealing surface 314 to further improve the sealing performance of the sealing portion 321 abutting against the sealing surface 314.

[0170] Referring to FIGS. 7-9, in some embodiments, the one-way valve 30 includes a first natural state in which the sealing portion 321 opens the first flow channel 312.

[0171] The first natural state refers to a state of the one-way valve 30 when the one-way valve 30 is not subjected to the pressure of the fluid in the first containing cavity 201 and the fluid in the second containing cavity 202. When the battery device 100 is in a non-working or normal working state, the one-way valve 30 can be in the first natural state.

[0172] When the one-way valve 30 is in the first natural state, the sealing portion 321 is separated from the sealing surface 314 under the action of its own weight, and the sealing portion 321 pulls the limiting portion 322 to abut against the valve body 31 through the connecting portion 323. The first flow channel 312 is in an open state, and at this time, the first containing cavity 201 and the second containing cavity 202 are in communication with each other, so that the fluid in the second containing cavity 202 can be more quickly discharged into the first containing cavity 201.

[0173] When high-temperature and high-pressure flue gas appears in the first containing cavity 201, the one-way valve 30 is no longer in the first natural state, and the high-temperature and high-pressure flue gas can press the sealing portion 321 against the sealing surface 314 and close the first flow channel 312.

[0174] In this embodiment, the one-way valve 30 is in an open state under the action of its own weight in a natural state, so that the one-way valve 30 can be closed when the battery monomer 10 is in thermal runaway and generates high-temperature and high-pressure flue gas, and the structure of the one-way valve 30 is simplified.

[0175] Referring to FIG. 7, FIG. 10, and FIG. 11, in some embodiments, the one-way valve 30 further comprises an elastic member 35, one end of the elastic member 35 is connected to the valve core 32, and the other end is connected to the valve body 31, and the deformation direction of the elastic member 35 is the same as the moving direction of the valve body 31.

[0176] The elastic member 35 refers to a member with elasticity in the valve body 31, which can be a spring, an elastic rubber column, or other members with elasticity.

[0177] One end of the elastic member 35 is connected to the valve core 32, and the other end is connected to the valve body 31; in the case that the elastic member 35 comprises a sealing portion 321, one end of the elastic member 35 can be connected to the sealing portion 321; the end of the elastic member 35 connected to the valve body 31 can be connected to the outer wall surface of the valve body 31, at this time the elastic member 35 is located outside the valve body 31, or the end of the elastic member 35 connected to the valve body 31 can be connected to the inner wall of the flow-through cavity 311, at this time at least part of the elastic member 35 is located inside the flow-through cavity 311.

[0178] For example, in the case that the elastic member 35 comprises a limiting portion 322, the elastic member 35 can also be arranged between the limiting portion 322 and the outer wall of the valve body 31.

[0179] The deformation direction of the elastic member 35 is the same as the moving direction of the valve body 31, that is, the elastic member 35 is used to restore the valve body 31 to its original position after the valve body 31 moves; in the case that the battery device 100 is in an inoperative or normal working state, the one-way valve 30 can be in an open state, at this time the elastic member 35 can apply a force to the sealing portion 321 in a direction away from the sealing surface 314, and make the sealing portion 321 move away from the sealing surface 314, so that the first flow passage 312 is in an open state; in the case that the battery device 100 is in an inoperative or normal working state, the one-way valve 30 can also be in a closed state, at this time the elastic member 35 can apply a force to the sealing portion 321 in a direction towards the sealing surface 314, and make the sealing portion 321 abut against the sealing surface 314, so that the first flow passage 312 is in a closed state.

[0180] For example, in the case that the battery device 100 is in an inoperative or normal working state and the one-way valve 30 is in a closed state, in the case that fluid (for example, cooling liquid) appears in the second accommodating cavity 202, the fluid can push the sealing portion 321 to move in a direction away from the sealing surface 314, so that the first flow passage 312 is in an open state, at this time the elastic member 35 is stretched; when the fluid in the second accommodating cavity 202 is discharged, the elastic member 35 restores its length, and the sealing portion 321 abuts against the sealing surface 314 again to close the first flow passage 312; it can be understood that at this time the fluid pressure required for the one-way valve 30 to open can be set by adjusting the stiffness coefficient of the elastic member 35.

[0181] In the example, when the battery device 100 is in the non-working or normal working state, and the one-way valve 30 is in the open state, if the fluid (e.g., high-temperature and high-pressure flue gas) in the first accommodating cavity 201 can press the sealing part 321 against the sealing surface 314 and close the first flow channel 312, at this time, the elastic member 35 is compressed; when the fluid in the first accommodating cavity 201 is discharged, the elastic member 35 returns to the original length, and the sealing part 321 is separated from the sealing surface 314 to open the first flow channel 312; it can be understood that at this time, the fluid pressure required for closing the one-way valve 30 can also be set by adjusting the stiffness coefficient of the elastic member 35.

[0182] In the embodiment, the elastic member 35 is arranged to control the position of the valve body 31 in the natural state, and the stiffness coefficient of the elastic member 35 is adjusted to change the pressure condition required for opening or closing the one-way valve 30, so as to meet the requirements of different working conditions.

[0183] Referring to FIGS. 7, 10 and 11, in some embodiments, the fluid entering the flow cavity 311 from the second accommodating cavity 202 is a liquid; the one-way valve 30 further comprises an expansion member 36 accommodated in the flow cavity 311, the expansion member 36 is configured to swell by absorbing the liquid to make the sealing part 321 abut against the inner wall of the flow cavity 311 and the sealing part 321; the elastic member 35 is configured to apply a force to the sealing part 321 in the direction of the sealing surface 314 to abut against the sealing surface 314, and the force applied by the elastic member 35 to the sealing part 321 is smaller than the swelling force of the expansion member 36.

[0184] The expansion member 36 refers to a component in the one-way valve 30 that can swell when encountering a liquid, and the material of the expansion member 36 can include water-absorbing resin or other components that can absorb liquid and swell.

[0185] The expansion member 36 is arranged in the flow cavity 311, and when the liquid enters the flow cavity 311, the expansion member 36 swells by absorbing the liquid, so that the expansion member 36 can abut against the inner wall of the flow cavity 311 and the sealing part 321, and the continuous swelling of the expansion member 36 can push the sealing part 321 away from the sealing surface 314 to open the first flow channel 312, so that the one-way valve 30 is in the open state; it can be understood that in the state without water absorption, the expansion member 36 can be connected only to the inner wall of the flow cavity 311 or the sealing part 321.

[0186] The elastic member 35 is configured to apply a force to the sealing part 321 in the direction of the sealing surface 314, so that the sealing part 321 can abut against the sealing surface 314, thereby making the one-way valve 30 in the closed state when the battery device 100 is in the non-working or normal working state.

[0187] The elastic member 35 applies a force to the sealing portion 321 that is less than the expansion force of the expansion member 36, so that the expansion member 36 can push the sealing portion 321 away from the sealing surface 314 after swelling in the liquid.

[0188] When liquid appears in the second accommodating cavity 202, the liquid can enter the flow-through cavity 311 through the second flow channel 313, and the sealing portion 321 blocks the first flow channel 312, so that the expansion member 36 can swell after being soaked in the liquid; the expansion member 36 can push the sealing member 34 away from the sealing surface 314 after swelling, so as to open the first flow channel 312, and at this time, the fluid can be discharged through the first flow channel 312.

[0189] According to the material of the expansion member 36, the expansion member 36 can shrink after drying, or can not shrink again; since the second accommodating cavity 202 is difficult to appear liquid under normal circumstances, that is, the appearance of liquid in the second accommodating cavity 202 usually means that the battery device 100 fails and needs to be repaired, and the expansion member 36 or the entire one-way valve 30 can be replaced during the repair process, so the expansion member 36 can shrink after drying, or can not shrink again.

[0190] In the embodiment, the expansion body is provided, and in the case of liquid leakage in the second accommodating cavity 202, the leaked liquid can make the expansion body swell and make the sealing portion 321 away from the sealing surface 314, so as to facilitate the discharge of the liquid in the second accommodating cavity 202; at the same time, in the case that there is no liquid leakage in the second accommodating cavity 202, the elastic member 35 can make the sealing portion 321 abut against the sealing surface 314 to separate the first accommodating cavity 201 and the second accommodating cavity 202, and reduce the mutual influence between them.

[0191] Referring to FIGS. 7, 10, and 11, in some embodiments, the one-way valve 30 includes a second natural state, the sealing portion 321 blocks the first flow channel 312 in the second natural state, and the sealing portion 321 abuts against the sealing surface 314.

[0192] The second natural state refers to the state of the one-way valve 30 when it is not subjected to the pressure of the fluid in the first accommodating cavity 201 and the fluid in the second accommodating cavity 202, and the one-way valve 30 can be in the second natural state when the battery device 100 is in a non-working or normal working state.

[0193] When the one-way valve 30 is in the second natural state, the sealing portion 321 is abutted against the sealing surface 314 by the elastic member 35, and the first flow channel 312 is in a closed state, at this time, the first accommodating cavity 201 and the second accommodating cavity 202 are separated from each other to reduce the mutual influence between the first accommodating cavity 201 and the second accommodating cavity 202.

[0194] When liquid appears in the second accommodating cavity 202, the one-way valve 30 is no longer in the first natural state, and liquid can enter the flow cavity 311 through the second flow channel 313 and can soak the expansion member 36; the expansion member 36 expands after being soaked by liquid and pushes the sealing member 34 away from the sealing surface 314 to open the first flow channel 312, at this time, fluid can be discharged through the first flow channel 312.

[0195] In the embodiment, the one-way valve 30 is in the closed state under the influence of the elastic member 35 in the natural state, so that the one-way valve 30 can not only be closed in the natural state to reduce the mutual influence of the first accommodating cavity 201 and the second accommodating cavity 202, but also be opened in the case of liquid leakage in the second accommodating cavity 202 to facilitate the discharge of liquid from the second accommodating cavity 202, thereby reducing the damage to the electrical structure 50.

[0196] Referring to FIGS. 7-12, in some embodiments, the valve body 31 includes a valve body main body 316 and a fixing member 317, the valve body main body 316 includes a base 3161 and a fixed part 3162 connected to the base 3161, the base 3161 is located in the first accommodating cavity 201, and the fixed part 3162 passes through the upper box 21 and is located in the second accommodating cavity 202; the fixing member 317 is connected to the fixed part 3162, and part of the upper box 21 is clamped between the fixing member 317 and the base 3161.

[0197] The valve body main body 316 refers to a structure in the valve body 31 that mainly serves as a carrier for the structure of the one-way valve 30, and the flow cavity 311, the first flow channel 312, the second flow channel 313, and the limiting hole 3151 can all be arranged in the valve body main body 316; the shape of the valve body main body 316 can be cylindrical, prismatic, or other regular or irregular shapes; the material of the valve body main body 316 can include metal, plastic, or other materials.

[0198] The fixing member 317 refers to a structure for fixing the valve body main body 316 to the upper box 21; the material of the fixing member 317 can include metal, plastic, or other materials.

[0199] The base 3161 refers to a structure in the valve body main body 316 that is mainly used to connect with the upper box 21; the material of the base 3161 can include metal, plastic, or other materials.

[0200] The fixing portion 3162 refers to a structure in the valve body 316 mainly used for providing a fixing base for the fixing member 317. The fixing portion 3162 is connected to the base portion 3161. The fixing portion 3162 can be integrally formed with the base portion 3161, or can be fixedly connected to the base portion 3161 by welding, bonding or other means. The fixing portion 3162 can also be detachably connected to the base portion 3161 by screwing, clamping or other means. The material of the fixing portion 3162 can include metal, plastic or other materials, and can be the same as or different from the material of the base portion 3161.

[0201] The base portion 3161 is located in the first accommodating cavity 201 and on the side of the upper box body 21 facing the first accommodating cavity 201. The fixing portion 3162 passes through the upper box body 21 from the base portion 3161, so that at least part of the fixing portion 3162 is located in the second accommodating cavity 202. The fixing member 317 is connected to the fixing portion 3162, and part of the upper box body 21 is clamped between the fixing member 317 and the base portion 3161 to fix the one-way valve 30 on the upper box body 21. The fixing member 317 can be fixedly connected to the fixing portion 3162 by welding, bonding or other means, or can be detachably connected to the fixing portion 3162 by screwing, clamping or other means.

[0202] For example, a through hole is formed in the upper box body 21. The fixing portion 3162 can pass through the through hole from the first accommodating cavity 201. At this time, the base portion 3161 is located in the first accommodating cavity 201 and abuts against the side of the upper box body 21 facing the first accommodating cavity 201. The fixing member 317 is connected to the part of the fixing portion 3162 located in the second accommodating cavity 202, and the fixing member 317 is located in the second accommodating cavity 202. The fixing member 317 abuts against the side of the upper box body 21 facing the second accommodating cavity 202. Part of the upper box body 21 around the through hole is clamped between the fixing member 317 and the base portion 3161. The fixing member 317 and the base portion 3161 thus fix the one-way valve 30 on the upper box body 21.

[0203] It can be understood that, according to the position of the fixing member 317, a through hole opposite to the second flow channel 313 can be formed in the fixing member 317 to facilitate the fluid in the second accommodating cavity 202 to enter the second flow channel 313. According to the shape and position of the fixing member 317, other through holes can also be formed in the fixing member 317 to be opposite to the limiting hole 3151 and the first flow channel 312.

[0204] In this embodiment, the valve body 31 includes the valve body 316 and the fixing member 317. Part of the upper box body 21 is clamped between the valve body 316 and the fixing member 317, so as to fix the one-way valve 30 on the upper box body 21.

[0205] Referring to FIGS. 7-12, in some embodiments, the outer wall of the fixing portion 3162 is provided with an external thread, and the fixing member 317 is a nut matched with the external thread.

[0206] The external thread covers at least part of the outer wall of the fixing portion 3162, the fixing member 317 is a nut, and at least part of the fixing member 317 can be threadedly matched with the external thread; at this time, under the action of the external thread, the fixing member 317 can be fixed on the fixing portion 3162, so that the fixing member 317 can abut against the upper box body 21 and can clamp the upper box body 21 between the base portion 3161 and the fixing member 317.

[0207] The fixing member 317 is connected to the fixing portion 3162 by thread matching, so as to facilitate the installation of the fixing member 317 and the installation, disassembly and replacement of the one-way valve 30.

[0208] Referring to FIGS. 12 and 13, in some embodiments, the fixing member 317 is sleeved on the fixing portion 3162, and a sealing groove 3171 is formed on the side of the fixing member 317 facing the base portion 3161; a protruding portion 3163 is protrudingly formed on the side of the base portion 3161 facing the fixing member 317, the protruding portion 3163 is accommodated in the sealing groove 3171, and the protruding portion 3163 abuts against the inner wall of the sealing groove 3171.

[0209] The fixing member 317 is sleeved on the fixing portion 3162, that is, the fixing member 317 is arranged around the fixing portion 3162, and the fixing portion 3162 penetrates through the fixing member 317; the sealing groove 3171 is formed on the side of the fixing member 317 facing the base portion 3161, and the sealing groove 3171 can be a square groove, a semicircular groove, a trapezoidal groove or a groove of other shapes.

[0210] The protruding portion 3163 refers to a protruding structure mainly used for matching with the sealing groove 3171, the protruding portion 3163 is located on the side of the base portion 3161 facing the sealing groove 3171, and the protruding portion 3163 protrudes from the base portion 3161 to the inside of the sealing groove 3171, so that the protruding portion 3163 can be accommodated in the sealing groove 3171; the protruding portion 3163 can be integrally formed with the base portion 3161, the protruding portion 3163 can be fixedly connected to the base portion 3161 by welding, bonding or other manners, the protruding portion 3163 can be detachably connected to the base portion 3161 by screwing, clamping or other manners; the material of the protruding portion 3163 can include metal, plastic or other materials, and the material of the protruding portion 3163 can be the same as or different from that of the base portion 3161.

[0211] The protruding portion 3163 can abut against the inner wall of the sealing groove 3171 to improve the sealing performance between the protruding portion 3163 and the sealing groove 3171. For example, the protruding portion 3163 can be a part of the valve body main part 316 and be integrally formed with the base 3161. In this case, the protruding portion 3163 is a rigid structure and has the same material as the base 3161. The protruding portion 3163 abutting against the inner wall of the sealing groove 3171 can improve the sealing performance between the protruding portion 3163 and the sealing groove 3171. For example, the protruding portion 3163 can also be a separate structure. In this case, the protruding portion 3163 can be a structure similar to a sealing rubber ring, a sealing metal washer, etc. The opposite ends of the protruding portion 3163 abut against the inner wall of the sealing groove 3171 and the base 3161, respectively. The protruding portion 3163 can slightly deform when the fixing member 317 abuts against the base 3161, so as to better improve the sealing performance between the protruding portion 3163 and the sealing groove 3171 and between the protruding portion 3163 and the base 3161. It can be understood that the protruding portion 3163 can also be other structures, not limited to the above two structures.

[0212] Since the fixing member 317 is sleeved on the fixing portion 3162, the sealing groove 3171 can surround the fixing portion 3162. Since the protruding portion 3163 cooperates with the sealing groove 3171, the protruding portion 3163 can also surround the fixing portion 3162. In this case, under the action of the sealing groove 3171 and the protruding portion 3163 surrounding the fixing portion 3162, the sealing performance between the fixing member 317 and the upper box body 21 and between the base 3161 and the upper box body 21 can be improved, so that the fluid in the first containing cavity 201 is not easy to enter the second containing cavity 202 through the gap between the base 3161 and the upper box body 21, and the fluid in the second containing cavity 202 is not easy to enter the first containing cavity 201 through the gap between the fixing member 317 and the upper box body 21.

[0213] In the embodiment, the sealing groove 3171 is arranged on the fixing member 317, and the sealing portion 321 is arranged on the base 3161. The sealing portion 321 cooperates with the sealing groove 3171 to better improve the sealing performance of the connection position between the fixing member 317 and the valve body main part 316, and to improve the sealing performance of the connection position between the valve body main part 316 and the upper box body 21.

[0214] In some embodiments, the battery device 100 further comprises a heat exchange assembly 60 arranged in the first containing cavity 201 and / or the second containing cavity 202.

[0215] The heat exchange assembly 60 refers to a structure for controlling the temperature of the working environment of the battery monomer 10 and / or the electrical structure 50 in the battery device 100. A large amount of heat is easily generated in the battery monomer 10 and the electrical structure 50 during use, and the environment temperature is easily increased, which can easily lead to a decrease in the efficiency of the battery monomer 10 and the electrical structure 50. Therefore, the heat exchange assembly 60 is mainly used to reduce the temperature in the first accommodating cavity 201 and the second accommodating cavity 202, but in some working conditions, the heat exchange assembly 60 can also play a role in increasing the temperature in the first accommodating cavity 201 and the second accommodating cavity 202. The heat exchange assembly 60 can exchange heat with the first accommodating cavity 201 and / or the second accommodating cavity 202 through a flowing heat exchange medium, which can be a gas, a liquid, a gas-liquid mixture, or the like.

[0216] In the case that the heat exchange assembly 60 is arranged in the second accommodating cavity 202 and the heat exchange medium leaks, the leaked heat exchange medium can be directly discharged to the space outside the box 20 through the one-way valve 30, so as to reduce the negative impact of the heat exchange medium leakage on the electrical structure 50.

[0217] In the embodiment, the heat exchange assembly 60 is arranged to control the temperature in the first accommodating cavity 201 and / or the second accommodating cavity 202, so as to improve the working efficiency of the battery monomer 10 and the electrical structure 50. At the same time, the one-way valve 30 can reduce the damage of the heat exchange medium leakage to the electrical structure 50.

[0218] Referring to FIG. 6, in some embodiments, the bottom of the box 20 is provided with a liquid discharge valve 40 for flowing the fluid in the first accommodating cavity 201 to the lower box 22.

[0219] The liquid discharge valve 40 refers to a structure for discharging the liquid in the first accommodating cavity 201 in the battery device 100. The liquid discharge valve 40 can be a mechanical liquid discharge valve 40 or an electronic liquid discharge valve 40. The liquid discharge valve 40 can be a straight-through liquid discharge valve 40 or a liquid discharge valve 40 with a filtering structure.

[0220] The liquid discharge valve 40 is arranged at the bottom of the box 20. This arrangement can make the liquid discharge valve 40 located at a lower position of the box 20, so that the fluid in the first accommodating cavity 201 can flow to the vicinity of the liquid discharge valve 40 and be discharged through the liquid discharge valve 40, thereby reducing the accumulation of the fluid in the first accommodating cavity 201.

[0221] For example, in the case that the upper box 21 is located above the lower box 22, the liquid discharge valve 40 can be located on the lower box 22 and on the side of the lower box 22 away from the upper box 21.

[0222] The liquid discharge valve 40 can be completely located in the first accommodating cavity 201, or completely located outside the lower box 22, or partially located in the first accommodating cavity 201 and partially extending outside the lower box 22.

[0223] In this embodiment, the liquid discharge valve 40 is arranged on the box 20 to enable the fluid in the first accommodating cavity 201 to be discharged outside the box 20, thereby reducing the damage of the liquid in the first accommodating cavity 201 to the battery monomer 10; after the fluid in the second accommodating cavity 202 is discharged into the first accommodating cavity 201 through the one-way valve 30, the fluid can also be discharged outside the box 20 through the liquid discharge valve 40, thereby reducing the accumulation of the fluid discharged from the second accommodating cavity 202 into the first accommodating cavity 201 in the first accommodating cavity 201 and reducing the damage to the battery monomer 10.

[0224] Referring to FIG. 6, in some embodiments, the liquid discharge valve 40 is a one-way valve, i.e., the fluid in the first accommodating cavity 201 can be discharged outside the box 20 through the liquid discharge valve 40, while impurities outside the box 20 are difficult to enter the first accommodating cavity 201 through the liquid discharge valve 40; this arrangement enables the liquid discharge valve 40 to not only discharge the fluid in the first accommodating cavity 201, but also prevent impurities outside the lower box 22 from entering the lower box 22, thereby reducing the negative impact of the outside environment on the battery monomer 10.

[0225] In some embodiments, the box 20 further comprises a flow guide structure accommodated in the first accommodating cavity 201, one end of the flow guide structure facing the one-way valve 30, and the other end of the flow guide structure facing the liquid discharge valve 40, to guide the fluid discharged from the one-way valve 30 to flow to the liquid discharge valve 40.

[0226] The flow guide structure refers to a structure arranged in the first accommodating cavity 201, which is used to guide the fluid discharged from the one-way valve 30 to flow to the liquid discharge valve 40; according to the type of the fluid, the flow guide structure can be a pipe structure or other structure; the flow guide structure can be directly connected to the box 20, or indirectly connected to the box 20 through a structural member and accommodated in the first accommodating cavity 201.

[0227] One end of the flow guide structure facing the one-way valve 30 can be directly connected to the one-way valve 30, or arranged spaced apart from the one-way valve 30; the other end of the flow guide structure facing the liquid discharge valve 40 can be directly connected to the liquid discharge valve 40, or arranged spaced apart from the liquid discharge valve 40.

[0228] The flow guide structure can bypass each battery monomer 10 along the edge of the box 20, or flow out of the space between the battery monomers 10 to allow the flow guide structure to pass through.

[0229] For example, the flow guide structure is a pipeline arranged in the box 20. The fluid discharged from the one-way valve 30 can flow to the drain valve 40 through the pipeline and be discharged to the space outside the box 20 through the drain valve 40.

[0230] In this embodiment, the flow guide structure is arranged in the first accommodating cavity 201, so that the fluid discharged from the one-way valve 30 to the second accommodating cavity 202 can flow to the drain valve 40 under the guidance of the flow guide structure, thereby reducing the damage that the fluid discharged from the second accommodating cavity 202 can cause to the battery monomer 10.

[0231] In some embodiments, the drain valve 40 is arranged opposite to the one-way valve 30, and an empty space is arranged between the drain valve 40 and the one-way valve 30.

[0232] The drain valve 40 is arranged opposite to the one-way valve 30, so that the fluid discharged from the second accommodating cavity 202 through the one-way valve 30 can flow to the drain valve 40 and be discharged more quickly. For example, in the case where the fluid discharged from the second accommodating cavity 202 through the one-way valve 30 is liquid, this arrangement can make the liquid flow to the drain valve 40 more quickly.

[0233] An empty space is arranged between the drain valve 40 and the one-way valve 30, that is, no battery monomer 10 or other structure is arranged between the drain valve 40 and the one-way valve 30, so that the fluid discharged from the second accommodating cavity 202 through the one-way valve 30 is less likely to contact the battery monomer 10 or other structure and cause damage. In addition, this arrangement can reduce the obstruction of the fluid flow caused by the battery monomer 10 or other structure, reduce the time for which the fluid stays in the first accommodating cavity 201, and thus reduce the risk of damage to the battery monomer 10 or other structure caused by the fluid.

[0234] The drain valve 40 and the one-way valve 30 can be arranged at the edge of the box 20, so as to reduce the interference of the drain valve 40 and the one-way valve 30 with the arrangement of the battery monomer 10. The drain valve 40 and the one-way valve 30 can be arranged on both sides of the battery monomer 10, and an empty space can be formed between the battery monomers 10 to allow the fluid to flow through.

[0235] In this embodiment, the drain valve 40 and the one-way valve 30 are arranged opposite to each other, and no other structure is arranged between the drain valve 40 and the one-way valve 30, so that the fluid discharged from the second accommodating cavity 202 can be discharged to the outside of the box 20 through the drain valve 40 more quickly. This arrangement can reduce the time for which the fluid discharged from the second accommodating cavity 202 stays in the first accommodating cavity 201, and thus reduce the risk of damage to the battery monomer 10 caused by the fluid discharged from the second accommodating cavity 202.

[0236] Referring to FIG. 6, in some embodiments, the battery cell 10 is received in the first receiving cavity 201 upside down such that the electrode terminal 14 is located on the side of the battery cell 10 facing away from the second receiving cavity 202, and the electrode terminal 14 is spaced apart from the inner wall of the opposite box 20.

[0237] The electrode terminal 14 can be used to electrically connect with the electrode assembly 13 for outputting or inputting the electric energy of the battery cell 10. The battery cell 10 is received in the first receiving cavity 201 upside down, i.e., the electrode terminal 14 is located on the side of the battery cell 10 facing away from the second receiving cavity 202.

[0238] Since the fluid in the second receiving cavity 202 can flow into the first receiving cavity 201 through the one-way valve 30, the electrode terminal 14 is located on the side of the battery cell 10 facing away from the second receiving cavity 202 to reduce the possibility of the fluid in the second receiving cavity 202 falling on the electrode terminal 14 when entering the first receiving cavity 201, thereby reducing the damage of the fluid in the second receiving cavity 202 to the battery cell 10.

[0239] The electrode terminal 14 is spaced apart from the inner wall of the opposite box 20, i.e., there is a gap between the electrode terminal 14 and the inner wall of the opposite box 20. After the fluid in the second receiving cavity 202 enters the first receiving cavity 201, the fluid can fall on the inner wall of the box 20 and flow to the drain valve 40 through the gap between the electrode terminal 14 and the inner wall of the opposite box 20, thereby reducing the possibility of the fluid submerging the electrode terminal 14, and thus reducing the damage of the fluid to the battery cell 10.

[0240] For example, in the case where the upper box 21 is located above the lower box 22, the electrode terminal 14 faces the bottom wall of the lower box 22 and there is a gap between the electrode terminal 14 and the bottom wall of the lower box 22. After the fluid in the second receiving cavity 202 enters the first receiving cavity 201, the fluid is less likely to directly fall on the electrode terminal 14 due to the shielding of the battery cell 10. After the fluid falls on the bottom wall of the lower box 22, the fluid can flow to the drain valve 40 through the gap between the electrode terminal 14 and the bottom wall of the lower box 22 and be drained out of the box 20, and thus the fluid is less likely to contact or submerge the electrode terminal 14, thereby reducing the damage of the fluid to the battery cell 10.

[0241] In this embodiment, the battery cell 10 is inverted to reduce the possibility of the liquid in the second receiving cavity 202 damaging the battery cell 10 when falling on the battery cell 10.

[0242] In some embodiments, the battery device 100 comprises a box 20 and a battery cell 10, the box 20 comprises a lower box 22 and an upper box 21 covering the lower box 22, and an outer shell 23 is further arranged above the upper box 21; the upper box 21 and the lower box 22 enclose a first accommodating cavity 201, and the upper box 21 and the outer shell 23 enclose a second accommodating cavity 202; the battery cell 10 is accommodated in the first accommodating cavity 201, and the electrical structure 50 is accommodated in the second accommodating cavity 202.

[0243] The upper box 21 is provided with a one-way valve 30, part of the one-way valve 30 is located in the first accommodating cavity 201, and the other part is located in the second accommodating cavity 202; the one-way valve 30 can communicate the first accommodating cavity 201 and the second accommodating cavity 202, so that the liquid in the second accommodating cavity 202 can flow into the first accommodating cavity 201 through the one-way valve 30, and the gas in the first accommodating cavity 201 is difficult to flow into the second accommodating cavity 202 through the one-way valve 30.

[0244] The one-way valve 30 comprises a valve body 31, the valve body 31 comprises a valve body main body 316 and a fixing piece 317, the valve body main body 316 comprises a fixed part 3162 and a base part 3161, the base part 3161 is located in the first accommodating cavity 201, and the fixed part 3162 passes through the upper box 21 and is located in the second accommodating cavity 202; the fixing piece 317 is connected to the fixed part 3162 and cooperates with the base part 3161 to clamp part of the upper box 21 between the fixing piece 317 and the base part 3161.

[0245] The valve body main body 316 is provided with a flow cavity 311, part of the flow cavity 311 is located in the fixed part 3162 and the other part is located in the base part 3161; the valve body main body 316 is further provided with a first flow channel 312, the first flow channel 312 is located on the base part 3161, one end of the first flow channel 312 communicates with the flow cavity 311, and the other end communicates with the first accommodating cavity 201; the valve body main body 316 is further provided with a second flow channel 313, the second flow channel 313 is located on the fixed part 3162, one end of the second flow channel 313 communicates with the flow cavity 311, and the other end communicates with the second accommodating cavity 202; the valve body main body 316 further comprises a limiting hole 3151, the limiting hole 3151 is arranged on the fixed part 3162 and located above the flow cavity 311, one end of the limiting hole 3151 communicates with the flow cavity 311, and the other end communicates with the second accommodating cavity 202.

[0246] The valve core 32 comprises a sealing part 321, a connecting part 323 and a limiting part 322; the sealing part 321 is located below the valve body main body 316 and in the first containing cavity 201, the sealing part 321 can abut against the sealing surface 314 of the valve body 31 to close the first flow channel 312 and close the one-way valve 30, and the sealing part 321 can also be separated from the sealing surface 314 of the valve body 31 to open the first flow channel 312 and open the one-way valve 30; one end of the connecting part 323 is connected to the upper side of the sealing part 321, the other end of the connecting part 323 extends to the second containing cavity 202 through the flow passage 311 and the limiting hole 3151, and is connected to the limiting part 322; the maximum width of the limiting part 322 is greater than the inner diameter of the limiting hole 3151, that is, the limiting part 322 is difficult to enter the limiting hole 3151.

[0247] The battery monomer 10 is inverted in the first containing cavity 201, and the electrode terminal 14 of the battery monomer 10 faces downward and has a gap with the bottom wall of the lower box body 22; the bottom wall of the lower box body 22 is also provided with a liquid discharge valve 40.

[0248] In the second aspect, the embodiments of the present application also provide a battery device 100.

[0249] In the battery device, the liquid leaked into the second containing cavity 202 by the liquid cooling system can be discharged to the first containing cavity 201 through the one-way valve 30, so as to reduce the damage of the liquid cooling system damage to the electrical structure 50 of the battery device 100, thereby improving the stability of the battery device 100; the battery monomer 10 in the first containing cavity 201 is difficult to enter the second containing cavity 202 under the high temperature and high pressure smoke generated by thermal runaway, so as to reduce the damage of the thermal runaway of the battery monomer 10 to the electrical structure 50 of the battery device 100, thereby further improving the stability of the battery device 100.

[0250] In the third aspect, the embodiments of the present application also provide a vehicle 1000 comprising the battery device 100 provided by some embodiments of the first aspect, and the top of the box body 20 forms at least part of the floor of the vehicle 1000.

[0251] The top of the box body 20 can be used as the entire floor of the vehicle 1000, or can only be used as part of the floor of the vehicle 1000; at this time, the side of the top of the box body 20 facing the passenger compartment can be directly used to carry passengers and articles, the passengers can directly step on the top of the box body 20, and the articles can also be directly placed on the top of the box body 20, and only part of the floor structure or no floor structure can be arranged in the vehicle 1000, thereby reducing the overall weight of the vehicle 1000 and saving the space of the original floor structure to increase the space of the passenger compartment.

[0252] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, The application relates to a battery pack, which comprises: a battery cell; an electrical structure; a box, which is internally provided with a first accommodating cavity for accommodating the battery cell and a second accommodating cavity for accommodating the electrical structure, at least a part of the second accommodating cavity being located above the first accommodating cavity; a one-way valve, which is arranged on the box, one end of the one-way valve being directed towards the first accommodating cavity and the other end of the one-way valve being directed towards the second accommodating cavity, the one-way valve being configured to allow fluid in the second accommodating cavity to enter the first accommodating cavity and to prevent fluid in the first accommodating cavity from entering the second accommodating cavity.

2. The battery device of claim 1, wherein, The box comprises an upper box and a lower box connected to the upper box, the lower box being internally provided with the first accommodating cavity with an open end, and the upper box covers the open side of the first accommodating cavity; The box further comprises an outer shell, which is arranged on the side of the upper box away from the lower box, and the outer shell is internally provided with the second accommodating cavity.

3. The battery device of claim 2, wherein, The one-way valve comprises a valve body connected to the upper box, the valve body being internally provided with a flow-through cavity, a first flow channel and a second flow channel, which are in communication with the flow-through cavity, one end of the first flow channel being in communication with the first accommodating cavity, and one end of the second flow channel being in communication with the second accommodating cavity; The one-way valve further comprises a valve core movably connected to the valve body, the valve core being movable to open or close the first flow channel and / or the second flow channel.

4. The battery device of claim 3, wherein, The valve body further comprises a sealing surface directed towards the first accommodating cavity, and one end of the first flow channel in communication with the first accommodating cavity is located on the sealing surface; The valve core comprises a sealing part movably connected to the valve body, and the sealing part can abut against the sealing surface to close the first flow channel.

5. The battery device of claim 4, wherein, The valve body is provided with a limiting structure, and the limiting structure is internally provided with a limiting hole in communication with the flow-through cavity; The valve core further comprises a limiting part connected to the sealing part through a connecting part, and the limiting part and the sealing part are respectively located on two sides of the limiting structure, and the maximum width of the limiting part is greater than the inner diameter of the limiting hole.

6. The battery device of claim 5, wherein, The limiting hole is located on the side of the flow-through cavity directed towards the second accommodating cavity, and the sealing surface is located on the side of the flow-through cavity directed towards the first accommodating cavity.

7. The battery device according to claim 5 or 6, wherein The side of the valve body directed towards the first accommodating cavity is provided with a guide groove, and the sealing part is accommodated in the guide groove; The sealing part is internally provided with at least one third through hole, and the third through hole is opposite to the sealing surface in the moving direction of the valve core.

8. The battery device of any one of claims 5-7, wherein, The side of the sealing surface directed towards the first accommodating cavity is provided with a sealing member surrounding one end of the first flow channel, and the sealing part can abut against the sealing member.

9. The battery device of any one of claims 4-8, wherein, The one-way valve comprises a first natural state, and the sealing part opens the first flow channel in the first natural state.

10. The battery device of any one of claims 4-8, wherein, The one-way valve further comprises an elastic member, one end of the elastic member being connected to the valve core and the other end of the elastic member being connected to the valve body, and the deformation direction of the elastic member is the same as the moving direction of the valve body.

11. The battery device of claim 10, wherein, The fluid entering the flow-through cavity from the second accommodating cavity is a liquid. The one-way valve further comprises an expansion member accommodated in the flow passage cavity, the expansion member is configured to be expanded by liquid to abut against the inner wall of the flow passage cavity and the sealing portion; The elastic member is configured to apply a force to the sealing portion in the direction of the sealing surface to make the sealing portion abut against the sealing surface, and the force applied by the elastic member to the sealing portion is less than the expansion force of the expansion member.

12. The battery device according to claim 10 or 11, wherein, The one-way valve comprises a second natural state, the sealing portion closes the first flow passage in the second natural state, and the sealing portion abuts against the sealing surface.

13. The battery device of any one of claims 3-12, wherein, The valve body comprises a valve body main body and a fixing member, the valve body main body comprises a base and a fixing portion connected to the base, the base is located in the first accommodating cavity, and the fixing portion penetrates through the upper box body and is located in the second accommodating cavity; The fixing member is connected to the fixing portion, and part of the upper box body is clamped between the fixing member and the base.

14. The battery device of claim 13, wherein, An outer wall of the fixing portion is provided with an external thread, and the fixing member is a nut matched with the external thread.

15. The battery device according to claim 13 or 14, wherein The fixing member is sleeved on the fixing portion, and a sealing groove is formed on one side of the fixing member facing the base; A protruding portion is protruded on one side of the base facing the fixing member, the protruding portion is accommodated in the sealing groove, and the protruding portion abuts against the inner wall of the sealing groove.

16. The battery device of any one of claims 1-15, wherein, The battery device further comprises a heat exchange assembly arranged in the first accommodating cavity and / or the second accommodating cavity.

17. The battery device of any one of claims 1-16, wherein, A bottom of the box body is provided with a liquid discharge valve for allowing the fluid in the first accommodating cavity to flow out of the box body.

18. The battery device of claim 17, wherein, The liquid discharge valve is a one-way valve.

19. The battery device of claim 17 or 18, wherein, The box body further comprises a flow guide structure accommodated in the first accommodating cavity, one end of the flow guide structure faces the one-way valve, and the other end of the flow guide structure faces the liquid discharge valve to guide the fluid flowing out of the one-way valve to flow to the liquid discharge valve.

20. The battery device of claim 17 or 18, wherein, The liquid discharge valve is arranged opposite to the one-way valve, and a vacant space is arranged between the liquid discharge valve and the one-way valve.

21. The battery device of any one of claims 1-20, wherein, The battery monomer comprises an electrode terminal, and the battery monomer is accommodated in the first accommodating cavity in an inverted manner so that the electrode terminal is located on a side of the battery monomer away from the second accommodating cavity; The electrode terminal is arranged in a spaced manner with the opposite inner wall of the box body.

22. An electrical device, comprising: The battery device comprises the battery device as claimed in any one of claims 1-21.

23. A vehicle, wherein, The battery device comprises the battery device as claimed in any one of claims 1-21, and a top of the box body forms at least part of a floor of the vehicle.

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