Battery device, electric device and vehicle

Abstract

The present application applies to the technical field of power battery devices. Provided are a battery device (100), an electric device (1000), and a vehicle. The battery device comprises: battery cells (10); an electrical structure (40); a case (20), wherein a first accommodating cavity (201) and a second accommodating cavity (202) are provided inside the case; and a one-way valve (30) connected to the case, wherein one end of the one-way valve faces the second accommodating cavity, and the other end of the one-way valve faces the space outside the case; the one-way valve is configured to allow fluid in the second accommodating cavity to be discharged to the space outside the case, and the one-way valve is also used to prevent substances in the space outside the case from entering the second accommodating cavity. In the battery device provided in the embodiments of the present application, the provision of the one-way valve enables fluid in the second accommodating cavity to be directly discharged to the outside of the case; in addition, the one-way valve can also prevent impurities outside the case from entering the second accommodating cavity, thereby reducing damage to the electrical structure caused by external impurities.

Description

Battery device, electric device and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202422158021.8, 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 easily leading to 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 easily entered into the chamber for storing electrical structures, thereby easily leading to failure, short circuit and even fire of the electrical structures 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, and the second accommodating cavity being used for accommodating the electrical structure; and a one-way valve, which is arranged on the box body, one end of the one-way valve being in communication with the second accommodating cavity, and the other end of the one-way valve being in communication with a space outside the box body, the one-way valve being used for allowing fluid in the second accommodating cavity to enter the space outside the box body, and the one-way valve being further used for preventing substances in the space outside the box body from entering the second accommodating cavity.

[0008] In the technical scheme of the present embodiment, the first accommodating cavity and the second accommodating cavity are arranged to accommodate the battery monomer and the electrical structure, respectively; and the one-way valve is arranged to allow the fluid in the second accommodating cavity to be directly discharged to the space outside the box body, thereby reducing damage of the fluid leaked from the liquid cooling structure to the electrical structure; and the one-way valve can also prevent impurities outside the box body from entering the second accommodating cavity, thereby reducing damage of the impurities outside to the electrical structure.

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

[0010] In the technical solution of the embodiment, the upper box and the lower box enclose the first accommodating cavity, and the upper box and the outer shell enclose the second accommodating cavity to accommodate the battery monomer and the electrical structure respectively; the first accommodating cavity and the second accommodating cavity are separated by the upper box, so that the negative influence of the heat generated by the working or thermal runaway of the battery monomer on the electrical structure can be reduced, the negative influence of the heat generated by the thermal runaway of the electrical structure on the battery monomer can be reduced, and the negative influence of the electrical structure on the energy density of the battery device can be reduced.

[0011] In some embodiments, the upper box comprises a dislocation part formed by being dislocated with the lower box, and the one-way valve is arranged in the dislocation part.

[0012] In the technical solution of the embodiment, the upper box and the lower box are dislocated to form the dislocation part, and the one-way valve is arranged in the dislocation part, so that the fluid discharged to the outside of the box through the one-way valve is not easy to stay on the upper box; in the case that the fluid is a liquid, the arrangement can make the liquid discharged in the second accommodating cavity not easy to stay on the upper box, so that the risk of failure of the battery device can be reduced.

[0013] In some embodiments, the dislocation part is closer to the bottom of the lower box than other positions of the upper box.

[0014] In the technical solution of the embodiment, the one-way valve is arranged at the dislocation part, and the dislocation part is closer to the bottom of the lower box, so that the fluid can better gather around the one-way valve and be discharged, and the accumulation of the fluid in the second accommodating cavity can be reduced, so that the damage of the fluid to the electrical structure can be better reduced.

[0015] In some embodiments, the box comprises an upper box, a lower box, an outer shell and a bottom plate, the first accommodating cavity is formed between the upper box and the lower box, the bottom plate is fixed with the upper box, the second accommodating cavity is formed between the outer shell and the bottom plate, at least part of the bottom plate extends to the outside of the upper box, and the one-way valve is arranged on the part of the bottom plate extending to the outside of the upper box.

[0016] The technical solution of the embodiment provides specific structures of the outer shell, so that at least part of the bottom plate of the outer shell can extend to the outside of the upper box, and the one-way valve is arranged on the part of the bottom plate extending to the outside of the upper box, so that the fluid discharged to the outside of the box through the one-way valve is not easy to stay on the upper box.

[0017] In some embodiments, the bottom plate comprises a connecting portion connected to the upper cabinet and an extending portion, one end of the extending portion is connected to the connecting portion or the upper cabinet, and the other end of the extending portion extends out of the upper cabinet; the one-way valve is arranged on the extending portion.

[0018] The technical scheme of the embodiment further provides the structure of the bottom plate, so that the bottom plate comprises the connecting portion connected to the upper cabinet, so that the shell can be more stably connected to the upper cabinet; the bottom plate further comprises the extending portion extending out of the upper cabinet, and the one-way valve is arranged on the extending portion, so that the fluid discharged out of the cabinet through the one-way valve is less likely to stay on the upper cabinet.

[0019] In some embodiments, the extending portion protrudes towards the bottom of the lower cabinet to form a collecting groove in communication with the second accommodating cavity, the bottom of the collecting groove is closer to the bottom of the lower cabinet than other positions of the shell and the bottom plate; and the one-way valve is arranged at the bottom of the collecting groove.

[0020] In the technical scheme of the embodiment, the collecting groove is arranged and the bottom of the collecting groove is closer to the bottom of the lower cabinet, and the one-way valve is arranged at the bottom of the collecting groove, so that the liquid in the second accommodating cavity can flow better into the collecting groove, thereby facilitating the discharge of the fluid in the second accommodating cavity through the one-way valve and better reducing the accumulation of the fluid in the second accommodating cavity.

[0021] In some embodiments, the cabinet further comprises a protruding rib arranged on the upper cabinet, the protruding rib is located in the second accommodating cavity; and the electrical structure is connected to the side of the protruding rib away from the upper cabinet, and the electrical structure is arranged in a spaced manner with the upper cabinet.

[0022] In the technical scheme of the embodiment, the electrical structure is arranged on the protruding rib protruding from the upper cabinet, so that a gap can exist between the electrical structure and the bottom of the second accommodating cavity, and in the case that the fluid is generated in the second accommodating cavity, the arrangement can prevent the electrical structure from being in contact with the fluid accumulated at the bottom of the second accommodating cavity, thereby reducing the possible damage to the electrical structure.

[0023] In some embodiments, the battery device further comprises a heat exchange assembly arranged in the first accommodating cavity and / or the second accommodating cavity.

[0024] In the embodiment, the heat exchange assembly is arranged to control the temperature in the first accommodating cavity and / or the second accommodating cavity, so as to improve the working efficiency of the battery monomer and the electrical structure; at the same time, the one-way valve can reduce the damage caused by the leakage of the heat exchange medium.

[0025] In some embodiments, the one-way valve comprises a valve body connected to the box, a flow passage is formed in the valve body, and a first flow channel and a second flow channel are formed in the valve body and communicate with the flow passage; the first flow channel further communicates with a space outside the box, and the second flow channel further communicates with the second containing cavity; the one-way valve further comprises a valve core movably connected to the valve body, and the valve core can open or close the first flow channel and / or the second flow channel.

[0026] The technical scheme of the embodiment provides a structure of some one-way valves, so that the valve core of the one-way valve can move 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.

[0027] 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 of the elastic member is connected to the valve body; the deformation direction of the elastic member is the same as the movement direction of the valve body; and the elastic member is configured to apply a force to the valve core to close the first flow channel.

[0028] In the technical scheme of the embodiment, the elastic member is arranged to facilitate the control of the position of the valve body in a natural state by the elastic member; at the same time, the required pressure condition for opening the one-way valve can be changed by adjusting the stiffness coefficient of the elastic member to meet the requirements of different working conditions.

[0029] In some embodiments, the fluid entering the flow channel 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 being soaked in the liquid and abut against the inner wall of the flow passage and the valve core to push the valve core to open the first flow channel; and the force applied by the elastic member to the valve core is smaller than the force applied by the expansion member to the valve core.

[0030] In the technical scheme of the embodiment, the expansion member is arranged, in the case of liquid leakage in the second containing cavity, the leaked liquid can make the expansion member swell and make the valve body open the first flow channel, so as to discharge 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 valve core close the first flow channel, so as to separate the second containing cavity from the space outside the box, so that foreign matters in the outside environment are difficult to enter the second containing cavity, and the negative effects of the foreign matters on the electrical structure are reduced.

[0031] In some embodiments, the valve body further comprises a sealing surface facing the outside of the box, and one end of the first flow channel 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.

[0032] The technical scheme of the embodiment comprises a sealing surface on the valve body facing outside the box, and a sealing part on the valve core 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; meanwhile, in the case of fluid leakage in the second containing 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 containing cavity to the space outside the box.

[0033] In some embodiments, the valve body is provided with a guide groove on the side facing outside the box, and the sealing part is accommodated in the guide groove; at least one through hole is formed in the sealing part, and the through hole is opposite to the sealing surface in the moving direction of the valve core.

[0034] In the technical scheme of the embodiment, the through hole is formed in the sealing part, so that in the case that the sealing part is away from the sealing surface, the fluid can flow from the flow cavity through the through hole, so as to facilitate the flow of the fluid from the second containing cavity to the outside; meanwhile, the through hole is opposite to the sealing surface, so that in the case that the sealing part abuts against the sealing surface, the sealing surface can close the through hole, thereby preventing foreign matters from entering the flow cavity through the through hole, so as to improve the sealing performance of the one-way valve.

[0035] 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 part connected to the base, the base is located outside the box, and the fixing part penetrates through the box and is located in the second containing cavity; the fixing member is connected to the fixing part, and part of the box is clamped between the fixing member and the base.

[0036] 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 box is clamped between the valve body main body and the fixing member, thereby fixing the one-way valve on the box.

[0037] In some embodiments, the outer wall of the fixing part is provided with an external thread, and the fixing member is a nut matched with the external thread.

[0038] The technical scheme of the embodiment provides some connection modes of the fixing member and the valve body main body, so as to facilitate the installation and fixation of the one-way valve.

[0039] In some embodiments, the fixing member is sleeved on the fixing part, and a sealing groove is formed in the side of the fixing member facing the base; a protruding part is protruded on the side of the base facing the fixing member, the protruding part is accommodated in the sealing groove, and the protruding part abuts against the inner wall of the sealing groove.

[0040] In the technical scheme of the embodiment, the sealing groove is formed on the fixing member, and the sealing part is formed on the base, and the sealing part 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.

[0041] In a second aspect, some embodiments of the present application further provide a battery device for use in an electric device.

[0042] In a third aspect, some embodiments of the present application further provide a vehicle comprising the battery device provided by some embodiments of the first aspect, wherein a top of the box forms at least part of a floor of the vehicle.

[0043] The above description is merely a summary of the technical solutions of the present application. In order to enable a person skilled in the art to better understand the technical means of the present application and implement the same according to the contents of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0044] 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 accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals denote same or similar components. In the drawings:

[0045] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0046] FIG. 2 is an exploded structural schematic diagram of a battery device provided by some embodiments of the present application;

[0047] FIG. 3 is an exploded structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0048] FIG. 4 is a sectional schematic diagram of a battery device provided by some embodiments of the present application;

[0049] FIG. 5 is a sectional schematic diagram of a battery device provided by some other embodiments of the present application;

[0050] FIG. 6 is a partial enlarged schematic diagram of A in FIG. 5;

[0051] FIG. 7 is a sectional schematic diagram of a one-way valve provided by some embodiments of the present application;

[0052] FIG. 8 is a sectional schematic diagram of a one-way valve provided by some embodiments of the present application;

[0053] FIG. 9 is a sectional schematic diagram of a one-way valve provided by some embodiments of the present application;

[0054] FIG. 10 is a sectional schematic diagram of a one-way valve provided by some embodiments of the present application;

[0055] FIG. 11 is a sectional schematic diagram of a valve body of a one-way valve provided by some embodiments of the present application;

[0056] Fig. 12 is a cross-sectional view of a fixing member in a one-way valve according to some embodiments of the present application.

[0057] The meanings of the reference signs in the figures are as follows: 1000, electrical device; 100, battery device; 10, battery cell; 11, housing; 12, end cover; 13, electrode assembly; 14, electrode terminal; 20, box body; 201, first accommodating cavity; 202, second accommodating cavity; 21, upper box body; 211, staggered part; 22, lower box body; 231, bottom plate; 2311, connecting part; 2312, extension part; 232, outer shell; 24, collection groove; 25, protruding rib; 30, one-way valve; 31, valve body; 311, flow-through cavity; 312, first flow channel; 313, second flow channel; 314, sealing surface; 315, limiting hole; 316, valve body main body; 3161, base; 3162, fixing part; 3163, protruding part; 317, fixing member; 3171, sealing groove; 32, valve core; 321, sealing part; 3211, through hole; 322, limiting part; 323, intermediate part; 33, elastic member; 34, expansion member; 35, guide groove; 40, electrical structure; 50, connection port; 60, heat exchange assembly; 200, motor; 300, controller. Embodiments of the present application

[0058] The embodiments of the technical solutions 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 solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0059] 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 terms used herein are only for the purpose of describing specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0060] 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.

[0061] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0062] In the description of the embodiments of the 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“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0063] In the description of the embodiments of the 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).

[0064] In the description of the embodiments of the 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, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0065] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, 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 application can be understood according to the specific circumstances.

[0066] At present, from the development of market situation, the application of power battery device is more and more extensive. The power battery device is not only applied to the energy storage power supply system of hydraulic, thermal, wind and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as 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.

[0067] The battery device generally comprises battery cells and an electrical structure for controlling the state of the battery device, and the electrical structure generally comprises various control systems (such as a battery device 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 high heat during work, liquid cooling structures are arranged in the energy compartment and the battery device compartment.

[0068] 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 quickly rise in the high-voltage compartment and immerse the electrical structure, thereby easily causing the electrical structure to appear short circuit and the like.

[0069] 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 effects on the electrical structure in the high-voltage compartment, thereby easily causing the failure of the electrical structure.

[0070] 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 arranged, and the battery cells are arranged in the first accommodating cavity; an outer shell is arranged, a second accommodating cavity is arranged in the outer shell, and the electrical structure is arranged in the second accommodating cavity, so that the first accommodating cavity and the second accommodating cavity are located on both sides of the upper box; a one-way valve is arranged on the outer shell, so that the cooling liquid in the second accommodating cavity can be discharged to the outside of the box through the one-way valve.

[0071] In such a battery device, the first accommodating cavity and the second accommodating cavity are separated by the upper box, so that the negative effects of the heat generated by the battery cell work or thermal runaway on the electrical structure can be reduced, the negative effects of the heat generated by the thermal runaway of the electrical structure on the battery cell can be reduced, and the negative effects of the electrical structure on the energy density of the battery device can be reduced; the one-way valve can discharge the fluid in the second accommodating cavity to the outside of the box, thereby reducing the damage of the fluid leaked by the liquid cooling structure to the electrical structure; the one-way valve can also hinder impurities outside the box from entering the second accommodating cavity, thereby reducing the damage of the impurities outside to the electrical structure.

[0072] 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.

[0073] The following embodiments are described by taking a power consumption device 1000 of an embodiment of the present application as a vehicle for example for the convenience of description.

[0074] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 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 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery device 100 can be used for power supply of the vehicle, for example, the battery device 100 can be used as an operating power supply of the vehicle. The vehicle 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 working power demand of the vehicle during starting, navigation, and driving.

[0075] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle, but also be used as a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0076] 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 body 20 and a battery cell 10, and the battery cell 10 is accommodated in the box body 20.

[0077] The box body 20 is used to provide an accommodation space for the battery cell 10, and the box body 20 can adopt a variety of structures. In some embodiments, the box body 20 can include an upper box body 21 and a lower box body 22, and the upper box body 21 and the lower box body 22 are mutually covered to jointly define an accommodation space for accommodating the battery cell 10. The lower box body 22 can be a hollow structure with one end open, and the upper box body 21 can be a plate-shaped structure, which is covered on the open side of the lower box body 22 to jointly define the accommodation space with the lower box body 22. Alternatively, the upper box body 21 and the lower box body 22 can both be hollow structures with one side open, and the open side of the upper box body 21 is covered on the open side of the lower box body 22. Of course, the box body 20 formed by the upper box body 21 and the lower box body 22 can have a variety of shapes, such as a cylinder, a cuboid, and the like.

[0078] In the battery device 100, the battery cells 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 10 is accommodated in the case 20. Of course, the battery device 100 can also be in a form that the multiple battery cells 10 are connected in series, in parallel, or in a mixed manner to form a battery device 100 module, and 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 accommodated in the case 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 electrical connection between the multiple battery cells 10.

[0079] Each of the battery cells 10 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be in a shape of a cylinder, a flat body, a cuboid, or other shapes.

[0080] Referring to FIG. 3, FIG. 3 is an exploded structural schematic view of the battery cell 10 according to some embodiments of the present application. The battery cell 10 refers to the smallest unit constituting the battery device 100. As shown in the figure, the battery cell 10 includes an end cover 12, a shell 11, an electrode assembly 13, and other functional components.

[0081] 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 not easy to deform when subjected to extrusion and collision, so that the battery cell 10 can have higher structural strength, and the safety performance can also be improved. The end cover 12 can be provided with functional components such as an electrode terminal 14. The electrode terminal 14 can be used to electrically connect with the electrode assembly 13 for outputting or inputting 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 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 thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 12, which can be used to isolate the electrical connection components in the shell 11 from the end cover 12 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0082] The shell 11 is a component for fitting the end cover 12 to form an internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 13, the 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 made to cover 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 seal the internal environment of the shell 11, the end cover 12 is made to cover the shell 11. The shell 11 can be of various shapes and sizes, such as a cuboid, a cylinder, a 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 thereto.

[0083] The electrode assembly 13 is a component where electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 13 can be contained in the shell 11. The electrode assembly 13 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually 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 constituting the main body of the electrode assembly 13, and the portions without active materials of the positive electrode sheet and the negative electrode sheet each constitute a tab. The positive tab and the negative tab can be located together at one end of the main body or respectively at both ends of the main body. In the charging and discharging process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminal 14 to form a current loop.

[0084] In a first aspect, with reference to FIGS. 2, 4 and 5, the embodiments of the present application provide a battery device 100, comprising a battery cell 10, an electrical structure 40, a box 20 and a one-way valve 30. The box 20 is provided with 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 40; the one-way valve 30 is connected to the box 20, one end of the one-way valve 30 faces the second accommodating cavity 202, and the other end of the one-way valve 30 faces the space outside the box 20, the one-way valve 30 is configured to guide the fluid in the second accommodating cavity 202 to the space outside the box 20, and the one-way valve 30 is also used to block the substances in the space outside the box 20 from entering the second accommodating cavity 202.

[0085] In the figure, the direction of the X-axis is the length direction of the battery device 100, the direction of the Y-axis is the width direction of the battery device 100, and the direction of the Z-axis is the height direction of the battery device 100.

[0086] The battery cell 10 refers to the smallest unit that constitutes the battery device 100, and the number of the battery cell 10 can be one, two or more.

[0087] The box 20 refers to a structure in the battery device 100 for providing a containing space for the battery cell 10, and the box 20 is also used to provide a fixing base for the electrical structure 40 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 a cuboid, a cylinder or other shapes.

[0088] The first containing cavity 201 is a space structure in the box 20, and the first containing cavity 201 is used to contain the battery cell 10; the first containing cavity 201 is surrounded by part of the structure of the box 20, and the first containing cavity 201 can be a cuboid space, a semi-cylindrical space, a prismatic space or other shaped spaces, and the shape of the first containing cavity 201 can also be set according to the shape of the box 20.

[0089] The second containing cavity 202 is a space structure in the box 20, and the second containing cavity 202 is used to contain the electrical structure 40; the second containing cavity 202 is surrounded by part of the structure of the box 20, and the second containing cavity 202 can be a cuboid space, a semi-cylindrical space, a prismatic space or other shaped spaces, and the shape of the second containing cavity 202 can also be set according to the shape of the box 20.

[0090] The second containing cavity 202 can be arranged side by side with the first containing cavity 201, so that the first containing cavity 201 and the second containing cavity 202 can be located at about the same height; the second containing cavity 202 can also be located above the first containing cavity 201 along the direction of gravity, and the second containing cavity 202 can be completely located above the first containing cavity 201, or the second containing cavity 202 can be only partially located above the first containing cavity 201, and the other part of the second containing cavity 202 can be located on the side of the first containing cavity 201.

[0091] The one-way valve 30 refers to a valve structure that can allow medium to flow in one direction and hinder the flow in the opposite direction, and 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.

[0092] The one-way valve 30 is connected to the box 20. The one-way valve 30 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. The number of one-way valves 30 can be one, two or more. One end of the one-way valve 30 faces the second containing cavity 202, and the other end of the one-way valve 30 faces the space outside the box 20. The one-way valve 30 can allow the fluid in the second containing cavity 202 to flow to the space outside the box 20, while the one-way valve 30 can also prevent external impurities from entering the second containing cavity 202.

[0093] The space outside the box 20 is the external space of the box 20. The fluid in the second containing cavity 202 can be discharged to the space outside the box 20 through the one-way valve 30, that is, the fluid in the second containing cavity 202 should not be discharged into the first containing cavity 201.

[0094] The one-way valve 30 can be arranged on the side of the second containing cavity 202 or on the bottom of the second containing cavity 202, so as to facilitate the discharge of the fluid in the second containing cavity 202 to the outside of the box 20.

[0095] The fluid in the second containing 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 of the fluid is easy to cause short circuit of the electrical structure 40 and cause the electrical structure 40 to fail. In the case of a gas, the gas is easy to cause the gas pressure in the second containing cavity 202 to rise, which is easy to cause the gas near the electrical structure 40 to ionize and cause discharge, and the elevated gas pressure may also cause mechanical damage to the electrical structure 40. The arrangement of the one-way valve 30 can discharge the fluid in the second containing cavity 202 to reduce the damage to the electrical structure 40.

[0096] For example, the fluid in the second containing cavity 202 can be a liquid, which can be cooling liquid leaked from the liquid cooling system of the battery device 100 into the second containing cavity 202. At this time, the second containing cavity 202 can be located above the first containing cavity 201, so that the liquid in the second containing cavity 202 can be better discharged to the outside of the box 20 under the action of gravity through the one-way valve 30.

[0097] Since 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 40. Therefore, in the embodiment, the one-way valve 30 is arranged to facilitate the discharge of the fluid in the second accommodating cavity 202 to the outside of the box 20, thereby reducing the damage of the leaked fluid of the liquid cooling structure to the electrical structure 40; the one-way valve 30 can also prevent impurities outside the box 20 from entering the second accommodating cavity 202, thereby reducing the damage of the impurities outside to the electrical structure 40.

[0098] Referring to FIG. 4, 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 232 provided on the side of the upper box 21 away from the lower box 22, and the outer shell 232 is provided with a second accommodating cavity 202.

[0099] 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 monomer 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 other means.

[0100] 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 monomer 10; the first accommodating cavity 201 can be a cuboid space, or 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.

[0101] The upper box 21 can be a hollow structure with one end open to accommodate part or all of the structure of the battery monomer 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 the material of the lower box 22.

[0102] The upper box 21 covers the open side of the first accommodating cavity 201 and is connected to the lower box 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 21 can be located above the lower box 22 and cover the lower box 22.

[0103] The shell 232 refers to a part of the box body 20; the shell 232 can be prismatic, cylindrical, stepped or other shapes; the shell 232 is arranged on the upper box body 21, and the shell 232 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 232 can include metal, plastic or other materials, and the material of the shell 232 can be the same as or different from that of the upper box body 21.

[0104] The shell 232 is arranged on the side of the upper box body 21 away from the lower box body 22, i.e. the shell 232 is arranged on the side of the upper box body 21 away from the first containing cavity 201, and the shell 232 is located outside the first containing cavity 201.

[0105] The shell 232 can form a second containing cavity 202 with the upper box body 21, i.e. the shell 232 can be an open-ended structure, and the open end of the shell 232 faces the upper box body 21, so as to form a second containing cavity 202 together with the upper box body 21; the second containing cavity 202 is used to contain the electrical structure 40 of the battery device 100, which includes sensors, relays, connectors and the like in the battery device 100, and also includes battery device state detection systems, charging and discharging control systems and the like in the battery device 100; the shape of the second containing cavity 202 can be a prismatic space, a cylindrical space or other shaped space, and the shape of the second containing cavity 202 can also be set according to the shape of the shell 232; the first containing cavity 201 and the second containing cavity 202 are located on both sides of the upper box body 21, i.e. the upper box body 21 can separate the first containing cavity 201 and the second containing cavity 202, so as to reduce the mutual interference between the battery monomer 10 and the electrical structure 40, and at the same time, arranging the second containing cavity 202 outside the first containing cavity 201 can also reduce the occupation of the installation space of the battery monomer 10 by the electrical structure 40, so as to reduce the negative impact on the energy density of the battery device 100.

[0106] It can be understood that the specific position of the shell 232 on the upper box body 21 can be set according to the structure of the corresponding vehicle, so as to reasonably utilize the space of the vehicle, so that the shell 232 is located on the side of the upper box body 21 away from the lower box body 22, which can not only improve the energy density of the battery device 100, but also reduce the occupation of the installation space of the vehicle.

[0107] In the current battery device 100, the battery cell 10 and the electrical structure 40 are usually arranged in the same space and separated by a partition structure, which causes the electrical structure 40 to occupy 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 232 and the second accommodation cavity 202 outside the first accommodation cavity 201 are arranged to provide an independent accommodation space for the electrical structure 40, thereby reducing the negative impact of the electrical structure 40 on the energy density of the battery device 100.

[0108] At the same time, the first accommodation cavity 201 and the second accommodation cavity 202 are separated by the upper box 21, thereby reducing the negative impact of the heat generated by the battery cell 10 working or thermal runaway on the electrical structure 40, and reducing the negative impact of the heat generated by the electrical structure 40 thermal runaway on the battery cell 10.

[0109] The embodiment provides specific structures of some 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 232 enclose the second accommodation cavity 202 to accommodate the battery cell 10 and the electrical structure 40 respectively; the housing 232 and the lower box 22 are arranged on both 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 40.

[0110] Referring to FIG. 4, in some embodiments, the upper box 21 includes a staggered part 211 formed by being staggered with the lower box 22, and the one-way valve 30 is arranged in the staggered part 211.

[0111] The upper box 21 is staggered with the lower box 22, that is, part of the upper box 21 can extend outside the lower box 22, thereby forming a staggered part 211 outside the lower box 22 and the first accommodation cavity 201, and the staggered part 211 is located on one side of the lower box 22. The upper box 21 can be staggered with the lower box 22 in the length direction X of the battery device 100, and at this time the staggered part 211 is located on one side of the lower box 22 in the length direction X of the battery device 100; the upper box 21 can also be staggered with the lower box 22 in the width direction Y of the battery device 100, and at this time the staggered part 211 is located on one side of the lower box 22 in the width direction Y of the battery device 100.

[0112] The staggered part 211 is located on one side of the lower box 22, and at this time the staggered part 211 can be suspended relative to the lower box 22; for example, in the height direction Z of the battery device 100, the staggered part 211 is partially suspended relative to the lower box 22.

[0113] The one-way valve 30 is arranged on the misaligned portion 211 to enable the fluid in the second accommodating cavity 202 to be directly discharged to outside the case 20 through the one-way valve 30, and to prevent the fluid from being accumulated on the upper case 21 and to reduce the fluid adhered to the upper case 21 or the lower case 22.

[0114] In the case that the fluid is the leaked coolant of the liquid cooling system, if the coolant discharged from the one-way valve 30 is accumulated or adhered to the upper case 21 or the lower case 22 for a long time, the upper case 21 and the lower case 22 can be damaged by rusting. Arranging the one-way valve 30 on the misaligned portion 211 can reduce the damage of the upper case 21 and the lower case 22 caused by the fluid discharged to the outside, and can reduce the risk of the fluid entering the first accommodating cavity 201 from the gap between the upper case 21 and the lower case 22.

[0115] The misaligned portion 211 is used to provide a fixing base for the connecting port 50, i.e., the connecting port 50 can be arranged on the part of the shell 232 extending to the outside of the upper case 21, so as to facilitate the electrical structure 40 to be electrically connected to other structures outside the battery device 100 through the connecting port 50, and to facilitate other electronic components to be electrically connected to the electrical structure 40 through the connecting port 50.

[0116] In the embodiment, the upper case 21 and the lower case 22 are misaligned to form the misaligned portion 211, and the one-way valve 30 is arranged on the misaligned portion 211 to enable the fluid discharged to the outside of the case 20 through the one-way valve 30 to be less likely to stay on the upper case 21. In the case that the fluid is a liquid, the arrangement can enable the liquid discharged from the second accommodating cavity 202 to be less likely to stay on the upper case 21, thereby reducing the risk of the battery device 100 malfunctioning.

[0117] Referring to FIG. 4, in some embodiments, the misaligned portion 211 is closer to the bottom of the lower case 22 than other positions of the upper case 21.

[0118] The misaligned portion 211 is closer to the bottom of the lower case 22 than other positions of the upper case 21, so that the fluid in the second accommodating cavity 202 can converge at the misaligned portion 211 to facilitate the one-way valve 30 to better discharge the fluid in the second accommodating cavity 202 to the space outside the case 20. For example, in the case that the upper case 21 and the lower case 22 are arranged along the direction of gravity, the misaligned portion 211 can be the lowest position of the upper case 21, so that the fluid can first converge at the misaligned portion 211.

[0119] In the case that fluid appears in the second accommodating cavity 202 and needs to be discharged, the fluid in the second accommodating cavity 202 first converges at the staggered part 211, so that the generated fluid in the second accommodating cavity 202 can be discharged out of the box 20 faster and more, so as to reduce the fluid accumulation in the second accommodating cavity 202, thereby reducing the damage that the fluid may cause to the electrical structure 40.

[0120] In the embodiment, the one-way valve 30 is arranged at the staggered part 211, and the staggered part 211 is closer to the bottom of the lower box 22, so that the fluid can better converge near the one-way valve 30 and be discharged, and the fluid accumulation in the second accommodating cavity 202 can be reduced, thereby better reducing the damage of the fluid to the electrical structure 40.

[0121] Referring to FIGS. 5 and 6, in some embodiments, the box 20 includes an upper box 21, a lower box 22, an outer shell 232, and a bottom plate 231, the first accommodating cavity 201 is formed between the upper box 21 and the lower box 22, the bottom plate 231 is fixed with the upper box 21, the second accommodating cavity 202 is formed between the outer shell 232 and the bottom plate 231, at least part of the bottom plate 231 extends out of the upper box 21, and the one-way valve 30 is arranged on the part of the bottom plate 231 extending out of the upper box 21.

[0122] 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 the first accommodating cavity 201 accommodating the battery monomer 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 other means.

[0123] The bottom plate 231 refers to the part of the structure of the outer shell 232 connected to the upper box 21, and the bottom plate 231 is located on the side of the outer shell 232 facing the upper box 21; the bottom plate 231 can completely cover the side of the outer shell 232 facing the upper box 21, or the bottom plate 231 can only cover part of the side of the outer shell 232 facing the upper box 21.

[0124] The outer shell 232 can form the second accommodating cavity 202 together with the bottom plate 231; at this time, the outer shell 232 can be a structure with one end open, and the open end of the outer shell 232 faces the bottom plate 231, so that the second accommodating cavity 202 is formed by the upper box 21 and the outer shell 232 together; the bottom plate 231 can completely cover the open end of the outer shell 232, so that the bottom plate 231 and the outer shell 232 can form a closed second accommodating cavity 202; or the bottom plate 231 can only completely cover part of the open end of the outer shell 232, so that the upper box 21 can cooperate with the bottom plate 231 and the outer shell 232 to make the second accommodating cavity 202 a closed space.

[0125] At least part of the bottom plate 231 can extend out of the upper cabinet 21, i.e. the part of the bottom plate 231 extending out of the upper cabinet 21 is not in contact with the upper cabinet 21 and is suspended. The bottom plate 231 can extend out of the upper cabinet 21 only partially, in which case another part of the bottom plate 231 is connected to the upper cabinet 21. The bottom plate 231 can also extend out of the upper cabinet 21 completely, in which case the bottom plate 231 can be indirectly connected to the upper cabinet 21 through a structural member.

[0126] The one-way valve 30 is arranged on the part of the bottom plate 231 extending out of the upper cabinet 21, so that the fluid in the second accommodating cavity 202 can be directly discharged out of the cabinet 20 through the one-way valve 30, and the fluid is less likely to accumulate on the upper cabinet 21. In addition, the one-way valve 30 can also reduce the fluid adhering to the upper cabinet 21 or the lower cabinet 22, thereby reducing the damage that the fluid can cause to the upper cabinet 21 and the lower cabinet 22.

[0127] The embodiments provide specific structures of the shell 232, so that at least part of the bottom plate 231 of the shell 232 can extend out of the upper cabinet 21, and the one-way valve 30 is arranged on the part of the bottom plate 231 extending out of the upper cabinet 21, so that the fluid discharged out of the cabinet 20 through the one-way valve 30 is less likely to stay on the upper cabinet 21.

[0128] Referring to FIGS. 5 and 6, in some embodiments, the bottom plate 231 includes a connecting portion 2311 and an extending portion 2312. The connecting portion 2311 is connected to the upper cabinet 21. One end of the extending portion 2312 is connected to the connecting portion 2311 or the upper cabinet 21, and the other end of the extending portion 2312 extends out of the upper cabinet 21. The one-way valve 30 is arranged on the extending portion 2312.

[0129] The connecting portion 2311 refers to the structure of the bottom plate 231 connected to the upper cabinet 21. The connecting portion 2311 can have a circular, square or other shape. The connecting portion 2311 can be fixedly connected to the upper cabinet 21 by welding, bonding or other means, or can be detachably connected to the upper cabinet 21 by screwing, clamping or other means.

[0130] The extending portion 2312 refers to the structure of the bottom plate 231 extending out of the upper cabinet 21. The extending portion 2312 can be connected to the upper cabinet 21, in which case the extending portion 2312 can be fixedly connected to the upper cabinet 21 by welding, bonding or other means, or can be detachably connected to the upper cabinet 21 by screwing, clamping or other means. The extending portion 2312 can also be connected to the connecting portion 2311, in which case the extending portion 2312 can be integrally formed with the connecting portion 2311, or can be connected to the connecting portion 2311 by welding, bonding or other means.

[0131] Since the extension part 2312 and the connecting part 2311 are both part of the bottom plate 231, and the extension part 2312 extends out of the upper cabinet 21, the connecting part 2311 is located at the edge of the upper cabinet 21 and close to the extension part 2312, at this time, the connecting part 2311 can improve the connection strength of the outer shell 232 at the edge of the upper cabinet 21, and can also improve the strength of the corresponding edge of the upper cabinet 21, thereby improving the connection strength and stability of the extension part 2312.

[0132] The one-way valve 30 is arranged on the extension part 2312, so that the fluid in the second containing cavity 202 can be directly discharged out of the cabinet 20 through the one-way valve 30, and the fluid is not easy to accumulate on the upper cabinet 21, and the fluid adhered to the upper cabinet 21 or the lower cabinet 22 can be reduced, thereby reducing the damage that the fluid may cause to the upper cabinet 21 and the lower cabinet 22.

[0133] The embodiment provides some structures of the bottom plate 231, so that the bottom plate 231 includes the connecting part 2311 connected with the upper cabinet 21, so that the outer shell 232 can be more stably connected to the upper cabinet 21; the bottom plate 231 also includes the extension part 2312 extending out of the upper cabinet 21, and the one-way valve 30 is arranged on the extension part 2312, so that the fluid discharged out of the cabinet 20 through the one-way valve 30 is not easy to stay on the upper cabinet 21.

[0134] Referring to FIGS. 5 and 6, in some embodiments, the extension part 2312 protrudes towards the bottom of the lower cabinet 22 to form a collection groove 24 in communication with the second containing cavity 202, and the bottom of the collection groove 24 is closer to the bottom of the lower cabinet 22 than other positions of the outer shell 232 and the bottom plate 231; the one-way valve 30 is arranged at the bottom of the collection groove 24.

[0135] The extension part 2312 protrudes towards the bottom of the lower cabinet 22 to form the collection groove 24, that is, the collection groove 24 is in communication with the second containing cavity 202; since the extension part 2312 is part of the bottom plate 231, and the extension part 2312 is located outside the upper cabinet 21, the protruding direction of the extension part 2312 towards the bottom of the lower cabinet 22 can make the bottom of the collection groove 24 closer to the bottom of the lower cabinet 22 than other positions of the outer shell 232 and the bottom plate 231, so that the fluid in the second containing cavity 202 can converge to the collection groove 24.

[0136] For example, in the case that the upper cabinet 21 and the lower cabinet 22 are arranged along the direction of gravity, the protruding direction of the extension part 2312 is downward along the direction of gravity, at this time, the collection groove 24 can be located at the lowest position in the second containing cavity 202, and the fluid in the second containing cavity 202 can converge to the collection groove 24 under the action of gravity.

[0137] The one-way valve 30 is arranged at the bottom of the collecting groove 24, so that the one-way valve 30 is located at the lowest position of the collecting groove 24, thereby facilitating the discharge of the fluid in the collecting groove 24 out of the box 20 and reducing the accumulation of the fluid in the collecting groove 24.

[0138] In this embodiment, the collecting groove 24 is arranged and the bottom of the collecting groove 24 is closer to the bottom of the lower box 22, and the one-way valve 30 is arranged at the bottom of the collecting groove 24, so that the liquid in the second containing cavity 202 can flow into the collecting groove 24 more easily, thereby facilitating the discharge of the fluid in the second containing cavity 202 through the one-way valve 30 and reducing the accumulation of the fluid in the second containing cavity 202.

[0139] Referring to FIG. 5, in some embodiments, the box 20 further comprises a protruding rib 25 arranged on the upper box 21, the protruding rib 25 is located in the second containing cavity 202, and the electrical structure 40 is connected to the side of the protruding rib 25 away from the upper box 21, and the electrical structure 40 is spaced apart from the upper box 21.

[0140] The protruding rib 25 refers to a structure protruding from the upper box 21 into the second containing cavity 202 in the box 20, that is, the protruding rib 25 protrudes upward from the upper box 21 along the height direction Z of the battery device 100; the protruding rib 25 can be a hollow structure formed by bending a plate, or a solid rib structure, the protruding rib 25 can be a prismatic structure, a semi-cylindrical structure or other structures; the length direction of the protruding rib 25 can be parallel to the length direction X of the battery device 100, or parallel to the width direction Y of the battery device 100, or intersected with both the length direction X and the width direction Y of the battery device 100; the protruding rib 25 can be fixedly connected to the upper box 21 by welding, bonding or other means, or can be detachably connected to the upper box 21 by screwing, clamping or other means; the material of the protruding rib 25 can include metal, plastic or other materials.

[0141] The electrical structure 40 is connected to the side of the protruding rib 25 away from the upper box 21, that is, the electrical structure 40 is connected to the upper side of the protruding rib 25, which can form a gap between the electrical structure 40 and the bottom of the second containing cavity 202, thereby increasing the height of the electrical structure 40 in the second containing cavity 202 and reducing the risk of the electrical structure 40 being submerged by the fluid in the second containing cavity 202, thereby reducing the damage of the fluid to the electrical structure 40.

[0142] For example, in the case of leakage of the liquid cooling system in the second containing cavity 202, part of the leaked cooling liquid can temporarily accumulate at the bottom of the shell 232 without being discharged in time, at this time, the part of the cooling liquid is located below the electrical structure 40 and is not easy to contact or submerge the electrical structure 40, thereby reducing the damage of the leaked cooling liquid to the electrical structure 40.

[0143] Because the one-way valve 30 can discharge the fluid in the second accommodating cavity 202, the amount of fluid temporarily accumulated in the second accommodating cavity 202 is small, and the gap between the electrical structure 40 and the bottom of the second accommodating cavity 202 formed by the protrusion 25 can better reduce the contact of the fluid with the electrical structure 40 and reduce the damage that the fluid can cause to the electrical structure 40.

[0144] In this embodiment, the electrical structure 40 is arranged on the protrusion 25 protruding from the upper box 21, so that a gap can exist between the electrical structure 40 and the upper box 21. In the case where fluid is generated in the second accommodating cavity 202, this arrangement can prevent the electrical structure 40 from contacting the fluid accumulated at the bottom of the second accommodating cavity 202, thereby reducing the damage that the electrical structure 40 can suffer.

[0145] Referring to FIGS. 4 and 5, in some embodiments, the battery device 100 further comprises a heat exchange assembly 60 arranged in the first accommodating cavity 201 and / or the second accommodating cavity 202.

[0146] The heat exchange assembly 60 refers to a structure in the battery device 100 for controlling the temperature of the working environment of the battery cell 10 and / or the electrical structure 40. Because a large amount of heat is easily generated in the battery cell 10 and the electrical structure 40 during use and easily causes the environmental temperature to rise, a higher environmental temperature can easily lead to a decrease in the efficiency of the battery cell 10 and the electrical structure 40. 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 function to increase 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.

[0147] In the case where 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 that the leakage of the heat exchange medium can cause to the electrical structure 40.

[0148] In this 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 cell 10 and the electrical structure 40. At the same time, the one-way valve 30 can reduce the damage that the leakage of the heat exchange medium can cause.

[0149] Referring to FIG. 7 and FIG. 8, in some embodiments, the one-way valve 30 comprises a valve body 31 connected to the shell 232, the valve body 31 is provided with a flow cavity 311 and a first flow channel 312 and a second flow channel 313 communicated with the flow cavity 311, the first flow channel 312 is further communicated with the space outside the tank 20, and the second flow channel 313 is further communicated with the second containing cavity 202; the one-way valve 30 further comprises a valve core 32 movably connected to the valve body 31, the valve core 32 can open or close the first flow channel 312 and / or the second flow channel 313.

[0150] 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.

[0151] The valve body 31 is connected to the shell 232, and the valve body 31 can be fixedly connected to the shell 232 by welding, bonding or other means, or can be detachably connected to the shell 232 by screwing, clamping or other means. The valve body 31 can be completely contained in the second containing cavity 202, at this time the position opposite to the valve body 31 of the shell 232 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 shell 232 facing the outside world, that is, the valve body 31 can also be completely located outside the shell 232, at this time the position opposite to the valve body 31 of the shell 232 should be provided with a through hole to facilitate the flow of fluid; the valve body 31 can also be provided through the shell 232, that is, part of the valve body 31 can extend into the second containing cavity 202, and the other part can extend to the outside world.

[0152] The flow cavity 311 refers to the space structure in the valve body 31 for fluid flow, and the flow cavity 311 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 fluid flow, and the first flow channel 312 and the second flow channel 313 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 can be circular, square or other shapes.

[0153] The first flow channel 312 and the second flow channel 313 are both communicated with the flow cavity 311, one end of the first flow channel 312 is communicated with the flow cavity 311, and the other end is communicated with the space outside the tank 20, one end of the second flow channel 313 is communicated with the flow cavity 311, and the other end is communicated with the second containing cavity 202, so that the fluid in the second containing cavity 202 can be discharged to the outside of the tank 20 in sequence through the second flow channel 313, the flow cavity 311 and the first flow channel 312.

[0154] The fluid can flow for a long distance in the first flow channel 312, and in this case, the first flow channel 312 can be in a channel shape. The fluid can also flow for a short distance in the first flow channel 312, and in this case, the first flow channel 312 can be in a hole shape. Similarly, the second flow channel 313 can be in a channel shape or a hole shape.

[0155] 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 chambers and communicate with each other.

[0156] The flow passage 311 can be used for temporarily storing part of the fluid in addition to being used for fluid flow. For example, after the fluid in the second containing 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 containing cavity 202 and reduce damage to the electrical structure 40. At the same time, the temporarily stored fluid in the flow passage 311 can also increase the pressure of the fluid on the valve core 32.

[0157] 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.

[0158] 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.

[0159] 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 along the first flow channel 312 relative to the valve body 31, or can move radially along the first flow channel 312 relative to the valve body 31. 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 along the second flow channel 313 relative to the valve body 31, or can move radially along the second flow channel 313 relative to the valve body 31. 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.

[0160] The valve core 32 can be pushed by fluid to move, or the movement of the valve core 32 can be controlled by a controller, which can include an electric cylinder, a pneumatic cylinder or other structures. For example, when fluid is generated in the second accommodating cavity 202, the fluid in the second accommodating cavity 202 can push the valve core 32 to move to open the one-way valve 30, so that the fluid can be discharged from the second accommodating cavity 202 to the outside of the box 20; for example, when the valve core 32 is controlled by the controller, the controller can include a sensor arranged in the second accommodating cavity 202, the sensor is used to detect the fluid condition in the second accommodating cavity 202, and the controller can control the valve core 32 to move according to the detection information of the sensor, so as to open or close the one-way valve 30.

[0161] 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.

[0162] Referring to FIGS. 7 and 8, in some embodiments, the one-way valve 30 further comprises an elastic member 33, one end of the elastic member 33 is connected to the valve core 32, and the other end is connected to the valve body 31, the deformation direction of the elastic member 33 is the same as the movement direction of the valve body 31, and the elastic member 33 is configured to apply a force to the valve core 32 to close the first flow channel 312.

[0163] The elastic member 33 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.

[0164] One end of the elastic member 33 is connected to the valve core 32, and the other end is connected to the valve body 31; the end of the elastic member 33 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 33 is located outside the valve body 31, or the end of the elastic member 33 connected to the valve body 31 can be connected to the inner wall of the flow passage 311, at this time at least part of the elastic member 33 is located in the flow passage 311.

[0165] The deformation direction of the elastic member 33 is the same as the movement direction of the valve body 31, that is, the elastic member 33 is used to restore the valve body 31 to the original position after the movement of the valve body 31; the elastic member 33 is configured to apply a force to the valve core 32 to close the first flow channel 312, that is, when the battery device 100 is in a non-working or normal working state, the one-way valve 30 is in a closed state, so that foreign matters in the outside environment are difficult to enter the second accommodating cavity 202, thereby reducing the interference of the outside environment on the electrical structure 40.

[0166] 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 closed state, if fluid (e.g., coolant) appears in the second accommodating cavity 202, the fluid can push the valve core 32 to move so that the first flow passage 312 is in the open state, and the elastic member 33 is deformed at this time; when the fluid in the second accommodating cavity 202 is discharged, the elastic member 33 restores to the original length, and the valve core 32 restores to the original position to close the first flow passage 312; it can be understood that the fluid pressure required to open the one-way valve 30 can be set by adjusting the stiffness coefficient of the elastic member 33 at this time.

[0167] In the embodiment, the elastic member 33 is arranged to control the position of the valve body 31 in the natural state, and the stiffness coefficient of the elastic member 33 can be adjusted to change the pressure condition required to open the one-way valve 30, so as to meet the requirements of different working conditions.

[0168] Referring to FIGS. 7 and 8, in some embodiments, the fluid entering the flow passage from the second accommodating cavity 202 is liquid; the one-way valve 30 further comprises an expansion member 34 accommodated in the flow passage 311, the expansion member 34 is configured to swell by being soaked in the liquid and abut against the inner wall of the flow passage 311 and the valve core 32 to push the valve core 32 to open the first flow passage 312; the force applied by the elastic member 33 to the valve core 32 is smaller than the force applied by the expansion member 34 to the valve core 32.

[0169] The expansion member 34 refers to a member in the one-way valve 30 that can swell when encountering liquid, and the material of the expansion member 34 can include water-absorbing resin or other materials that can absorb liquid and swell.

[0170] The expansion member 34 is arranged in the flow passage 311, and when liquid enters the flow passage 311, the expansion member 34 can swell by being soaked in the liquid, so that the expansion member 34 can abut against the inner wall of the flow passage 311 and the valve core 32, and the expansion member 34 continues to swell to push the valve core 32 to move to open the first flow passage 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 34 can be connected only to the inner wall of the flow passage 311 or the valve core 32.

[0171] The force applied by the elastic member 33 to the valve core 32 is smaller than the force applied by the expansion member 34 to the valve core 32, so that the expansion member 34 can push the valve core 32 to move after swelling by being soaked in the liquid.

[0172] When liquid appears in the second accommodating cavity 202, the liquid can enter the flow cavity 311 through the second flow channel 313. Since the valve core 32 closes the first flow channel 312, the liquid is difficult to directly discharge and can accumulate in the flow cavity 311 to soak the expansion member 34. After the expansion member 34 is soaked by the liquid, the expansion member 34 expands and drives the valve core 32 to move, so as to open the first flow channel 312. At this time, the liquid can be discharged through the first flow channel 312.

[0173] According to the material of the expansion member 34, the expansion member 34 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. During the repair process, the expansion member 34 or the entire one-way valve 30 can be replaced. Therefore, the expansion member 34 can shrink after drying, or can not shrink again.

[0174] In the embodiment, the expansion member 34 is arranged. When liquid leakage appears in the second accommodating cavity 202, the leaked liquid can make the expansion member 34 expand and open the first flow channel 312 of the valve body 31, so as to facilitate the discharge of the liquid in the second accommodating cavity 202. At the same time, when there is no liquid leakage in the second accommodating cavity 202, the elastic member 33 can make the valve core 32 close the first flow channel 312, so as to separate the second accommodating cavity 202 from the external environment, so that external impurities are difficult to enter the second accommodating cavity 202, and the negative effects of external impurities on the electrical structure 40 are reduced.

[0175] Referring to FIGS. 7 and 8, in some embodiments, the valve body 31 further includes a sealing surface 314 facing outward of the box body 20, and one end of the first flow channel 312 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.

[0176] The sealing surface 314 refers to the surface of the valve body 31 facing the outside. 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. The shape of the sealing surface 314 can be set according to the shape of the valve body 31.

[0177] 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-shaped structure, a columnar structure or other structures. The sealing part 321 is movably arranged on the valve body 31. Since the sealing part 321 is used to close the first flow channel 312, the sealing part 321 can move in the radial direction of the first flow channel 312, or can move in the axial direction of the first flow channel 312, or can move in other directions.

[0178] It can be understood that according to the moving direction of the sealing part 321, a guide structure such as a sliding groove or a sliding rail can be arranged on the valve body 31 to guide 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.

[0179] The end of the first flow channel 312 connected to the space outside the box body 20 is located on the sealing surface 314. The sealing part 321 can be abutted against the sealing surface 314 to close the first flow channel 312 when the sealing part 321 moves relative to the valve body 31. At this time, the impurities in the outside environment are blocked by the sealing part 321 and are difficult to enter the first flow channel 312. The sealing part 321 can be spaced from the sealing surface 314 or staggered with the first flow channel 312 at the end of the sealing surface 314 when the sealing part 321 moves relative to the valve body 31, so as to open the first flow channel 312. At this time, the fluid in the second containing cavity 202 can be discharged to the outside of the box body 20 through the second flow channel 313, the flow passage 311 and the first flow channel 312.

[0180] Since the sealing surface 314 is located on the side of the valve body 31 facing the outside environment, and the sealing part 321 is abutted against the sealing surface 314, the sealing part 321 is located outside the flow passage 311 and on the side of the sealing surface 314 facing the outside environment. At this time, the fluid in the second containing cavity 202 enters the flow passage 311 through the second flow channel 313, and the fluid in the flow passage 311 or the expansion member 34 can push the sealing part 321 away from the sealing surface 314 to open the first flow channel 312, so that the liquid in the second containing cavity 202 can be discharged to the outside environment.

[0181] It can be understood that the shape of the side of the sealing part 321 opposite to 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 entry of impurities from the sealing part 321 and the sealing surface 314 into the first flow channel 312 and then into the second containing cavity 202.

[0182] For example, to improve the sealing performance between the sealing part 321 and the sealing surface 314, a sealing ring can be arranged on the sealing surface 314 or on the side of the sealing part 321 facing the sealing surface 314. In the case where the sealing part 321 is abutted against the sealing surface 314, the sealing ring is deformed, and the two ends of the sealing ring are abutted against the sealing surface 314 and the sealing part 321 respectively, so as to improve the sealing performance between the sealing part 321 and the sealing surface 314.

[0183] In the embodiment, the valve body 31 comprises a sealing surface 314 facing outside the box 20, and the valve core 32 comprises a sealing part 321 located outside the flow cavity 311, 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; at the same time, in the case of fluid leakage in the second containing cavity 202, the leaked fluid can enter the flow cavity 311 through the second flow channel 313 and push the sealing part 321 away from the sealing surface 314, so as to facilitate the fluid in the second containing cavity 202 to be discharged to the space outside the box 20.

[0184] Referring to FIGS. 7 and 8, in some embodiments, the valve body 31 is provided with a guide groove 35 on the side facing outside the box 20, and the sealing part 321 is accommodated in the guide groove 35; at least one through hole 3211 is formed in the sealing part 321, and the through hole 3211 is opposite to the sealing surface 314 in the moving direction of the valve core 32.

[0185] The guide groove 35 refers to a groove structure provided on the valve body 31, and the guide groove 35 is used to guide the moving direction of the sealing part 321; the guide groove 35 is provided on the side of the valve body 31 facing outside the box 20, and the sealing surface 314 can be the bottom surface of the guide groove 35; the guide groove 35 can be a square groove, a circular groove or other groove structures.

[0186] The axial direction of the guide groove 35 is consistent with the moving direction of the sealing part 321, so that the sealing part 321 can move along the axial direction of the guide groove 35; for example, the axial direction of the guide groove 35 can be parallel to the direction of gravity and perpendicular to the sealing surface 314.

[0187] The through hole 3211 refers to a hole structure formed in the sealing part 321, and the number of the through hole 3211 can be one, two or more; the through hole 3211 can be a square hole, a circular hole or other hole structures, and the through hole 3211 can be a straight hole, a stepped hole, a tapered hole or other hole structures.

[0188] The through hole 3211 is used for fluid flow when the sealing part 321 is away from the sealing surface 314, so that the fluid can be discharged from the second containing cavity 202 more quickly; the through hole 3211 is opposite to the sealing surface 314, and the sealing surface 314 can close the through hole 3211 when the sealing part 321 abuts against the sealing surface 314; when there are multiple through holes 3211, the multiple through holes 3211 are all opposite to the sealing surface 314, which can close the through holes 3211 by the sealing surface 314, so that external impurities are difficult to flow into the first flow channel 312 through the through holes 3211, thereby enabling the sealing part 321 to close the first flow channel 312.

[0189] Since the guide groove 35 is used to guide 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 35 or the gap between the side wall of the sealing part 321 and the inner wall of the guide groove 35 is small. In this case, the fluid is less likely to flow out of the flow-through cavity 311 when the sealing part 321 is separated from the sealing surface 314.

[0190] Accordingly, the present embodiment is provided with a through hole 3211 on the sealing part 321. When the sealing part 321 is separated from the sealing surface 314, the fluid can flow through the through hole 3211 from the flow-through cavity 311, so as to flow out of the second containing cavity 202 to the outside. Meanwhile, the through hole 3211 is opposite to the sealing surface 314. When the sealing part 321 abuts against the sealing surface 314, the sealing surface 314 can close the through hole 3211, so as to prevent the impurities from the outside entering the flow-through cavity 311 through the through hole 3211, thereby improving the sealing performance of the one-way valve 30.

[0191] In some embodiments, referring to FIG. 7 and FIG. 8, FIG. 7 is a sectional view of the one-way valve 30 in an open state, and FIG. 8 is a sectional view of the one-way valve 30 in a closed state, which is also a sectional view of the one-way valve 30 in a natural state.

[0192] The elastic member 33 and the expansion member 34 are both located in the flow-through cavity 311. In this case, the valve core 32 includes not only the sealing part 321 but also an intermediate part 323 connected to the sealing part 321. One end of the intermediate part 323 is connected to the sealing part 321, and the other end of the intermediate part 323 extends into the flow-through cavity 311.

[0193] One end of the elastic member 33 is connected to the inner wall of the flow-through cavity 311, and the other end of the elastic member 33 is connected to the intermediate part 323. The elastic member 33 can apply a force to the sealing part 321 through the intermediate part 323, so as to make the sealing part 321 abut against the sealing surface 314, thereby closing the first flow passage 312.

[0194] The expansion member 34 is connected to the inner wall of the flow-through cavity 311. After the liquid in the second containing cavity 202 enters the flow-through cavity 311 through the second flow passage 313, the expansion member 34 swells by soaking the liquid. A part of the expansion member 34 abuts against the inner wall of the flow-through cavity 311, and the other end of the expansion member 34 abuts against the sealing part 321 and pushes the sealing part 321 to move, so as to make the sealing part 321 separate from the sealing surface 314 and open the first flow passage 312. Meanwhile, the movement of the sealing part 321 can also make the elastic member 33 be stretched by the intermediate part 323.

[0195] In other embodiments, referring to FIG. 9, FIG. 10 and FIG. 11, FIG. 9 is a sectional view of the one-way valve 30 in an open state, FIG. 10 is a sectional view of the one-way valve 30 in a closed state, which is also a sectional view of the one-way valve 30 in a natural state.

[0196] The valve core 32 further comprises a limiting portion 322 connected to one end of the intermediate portion 323 away from the sealing portion 321, and the width of the limiting portion 322 is greater than the width of the intermediate portion 323.

[0197] The valve body 31 further comprises a limiting hole 315 in communication with the flow cavity 311, and one end of the intermediate portion 323 passes through the limiting hole 315 so that the limiting portion 322 is located outside the flow cavity 311; the maximum width of the limiting portion 322 is also greater than the inner diameter of the limiting hole 315, so that the limiting portion 322 is difficult to enter the limiting hole 315.

[0198] The elastic member 33 is located outside the flow cavity 311 and between the limiting portion 322 and the valve body 31, and the elastic member 33 can exert an upward force on the limiting portion 322 to make the sealing portion 321 abut against the sealing surface 314 through the intermediate portion 323.

[0199] The expansion member 34 is located in the flow cavity 311 and is connected to the inner wall of the flow cavity 311; after the liquid in the second containing cavity 202 enters the flow cavity 311 through the second flow channel 313, the expansion member 34 swells by soaking the liquid, one end of the expansion member 34 abuts against the inner wall of the flow cavity 311, and the other end of the expansion member 34 abuts against the sealing portion 321 and pushes the sealing portion 321 to move, so that the sealing portion 321 is separated from the sealing surface 314 and opens the first flow channel 312; at the same time, the movement of the sealing portion 321 can also drive the limiting portion 322 to compress the elastic member 33 through the intermediate portion 323, so that the elastic member 33 is deformed under pressure.

[0200] Referring to FIGS. 7-11, in some embodiments, the valve body 31 comprises a valve body main body 316 and a fixing member 317, the valve body main body 316 comprises a base portion 3161 and a fixing portion 3162 connected to the base portion 3161, the base portion 3161 is located outside the box body 20, and the fixing portion 3162 passes through the box body 20 and is located in the second containing cavity 202; the fixing member 317 is connected to the fixing portion 3162, and part of the box body 20 is clamped between the fixing member 317 and the base portion 3161.

[0201] The valve body main body 316 refers to the structure of the valve body 31 mainly used to provide a carrier for other structures of the one-way valve 30, and the flow cavity 311, the first flow channel 312 and the second flow channel 313 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.

[0202] The fixing member 317 refers to a structure for fixing the valve body 316 to the box 20. The material of the fixing member 317 can include metal, plastic or other materials.

[0203] The base 3161 refers to a structure in the valve body 316 mainly used for connecting to the box 20. The material of the base 3161 can include metal, plastic or other materials.

[0204] 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 3161. The fixing portion 3162 can be integrally formed with the base 3161. The fixing portion 3162 can be fixedly connected to the base 3161 by welding, bonding or other means. The fixing portion 3162 can be detachably connected to the base 3161 by screwing, clamping or other means. The material of the fixing portion 3162 can include metal, plastic or other materials. The material of the fixing portion 3162 can be the same as or different from that of the base 3161.

[0205] The base 3161 is located outside the box 20. The fixing portion 3162 penetrates through the box 20 from the base 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 box 20 is clamped between the fixing member 317 and the base 3161, so as to fix the one-way valve 30 to the box 20. The fixing member 317 can be fixedly connected to the fixing portion 3162 by welding, bonding or other means. The fixing member 317 can be detachably connected to the fixing portion 3162 by screwing, clamping or other means.

[0206] When the box 20 includes the shell 232, the one-way valve 30 is arranged on the shell 232. For example, a through hole is formed in the shell 232. The fixing portion 3162 can penetrate through the through hole from outside the shell 232. At this time, the base 3161 is located outside the shell 232 and abuts against a side of the shell 232 facing the outside. 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 a side of the shell 232 facing the second accommodating cavity 202. Part of the shell 232 around the through hole is clamped between the fixing member 317 and the base 3161. The fixing member 317 and the base 3161 fix the one-way valve 30 to the shell 232.

[0207] It can be understood that, according to the position of the fixing member 317, a through hole 3211 opposite to the second flow channel 313 can be formed on the fixing member 317, so that the fluid in the second accommodating cavity 202 can enter the second flow channel 313; according to the shape and position of the fixing member 317, other through holes 3211 can also be formed on the fixing member 317 to be opposite to the limiting hole 315 and the first flow channel 312.

[0208] In the embodiment, the valve body 31 comprises a valve body main body 316 and a fixing member 317, so as to clamp part of the box body 20 between the valve body main body 316 and the fixing member 317, thereby fixing the one-way valve 30 on the box body 20.

[0209] Referring to FIGS. 7-11, 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.

[0210] 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 outer shell 232 and clamp the outer shell 232 between the base portion 3161 and the fixing member 317.

[0211] The fixing member 317 is connected with the fixing portion 3162 through 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.

[0212] Referring to FIGS. 7-12, 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 protruded 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.

[0213] The fixing member 317 is sleeved on the fixing portion 3162, i.e., the fixing member 317 is arranged around the fixing portion 3162, and the fixing portion 3162 penetrates through the fixing member 317; a 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 with other shapes.

[0214] The protruding part 3163 refers to a protruding structure mainly used for cooperating with the sealing groove 3171. The protruding part 3163 is located on one side of the base 3161 facing the sealing groove 3171, and protrudes from the base 3161 to the inside of the sealing groove 3171, so that the protruding part 3163 can be accommodated in the sealing groove 3171. The protruding part 3163 can be integrally formed with the base 3161, or can be fixedly connected to the base 3161 by welding, bonding or other means. The protruding part 3163 can also be detachably connected to the base 3161 by screwing, clamping or other means. The material of the protruding part 3163 can include metal, plastic or other materials, and can be the same as or different from the material of the base 3161.

[0215] The protruding part 3163 can abut against the inner wall of the sealing groove 3171 to improve the sealing performance between the protruding part 3163 and the sealing groove 3171. For example, the protruding part 3163 can be part of the valve body 316 and integrally formed with the base 3161. In this case, the protruding part 3163 is a rigid structure and has the same material as the base 3161. The protruding part 3163 abutting against the inner wall of the sealing groove 3171 can improve the sealing performance between the protruding part 3163 and the sealing groove 3171. For example, the protruding part 3163 can also be a separate structure. In this case, the protruding part 3163 can be a structure similar to a sealing rubber ring or a sealing metal washer. The opposite ends of the protruding part 3163 abut against the inner wall of the sealing groove 3171 and the base 3161, respectively. The protruding part 3163 can slightly deform when the fixing part 317 abuts against the base 3161, so as to better improve the sealing performance between the protruding part 3163 and the sealing groove 3171, and between the protruding part 3163 and the base 3161. It can be understood that the protruding part 3163 can also be other structures, not limited to the above two.

[0216] Since the fixing part 317 is sleeved on the fixed part 3162, the sealing groove 3171 can surround the fixed part 3162. Since the protruding part 3163 cooperates with the sealing groove 3171, the protruding part 3163 can also surround the fixed part 3162. At this time, under the action of the sealing groove 3171 and the protruding part 3163 surrounding the fixed part 3162, the sealing performance between the fixing part 317 and the shell 232 and between the base 3161 and the shell 232 can be improved, so that foreign matter is not easy to enter the second accommodating cavity 202 through the gap between the base 3161 and the shell 232.

[0217] In the embodiment, the sealing groove 3171 is arranged on the fixing member 317, and the sealing part 321 is arranged on the base 3161 and cooperates with the sealing groove 3171, so that the sealing performance of the connection position of the fixing member 317 and the valve body 316 is improved, and the sealing performance of the connection position of the valve body 316 and the upper box body 21 is improved.

[0218] In some embodiments, the battery device 100 includes the battery cell 10, the electrical structure 40, the box body 20, and the one-way valve 30.

[0219] The box body 20 includes a lower box body 22, an upper box body 21, a bottom plate 231, and an outer shell 232. The lower box body 22 is internally provided with a first accommodating cavity 201 with an open end. The upper box body 21 is connected to the upper side of the lower box body 22 and covers the open side of the first accommodating cavity 201. The outer shell 232 is arranged above the upper box body 21, and the outer shell 232 is internally provided with a second accommodating cavity 202.

[0220] The battery cell 10 is accommodated in the first accommodating cavity 201, and the electrical structure 40 is accommodated in the second accommodating cavity 202.

[0221] Part of the bottom plate 231 and the outer shell 232 extends to the outside of the upper box body 21 along the length direction X of the battery device 100. The bottom plate 231 and the outer shell 232 enclose the second accommodating cavity 202. The bottom plate 231 includes a connecting part 2311 and an extending part 2312. The connecting part 2311 is connected to the upper box body 21. The extending part 2312 is connected to the upper box body 21 and extends to the outside of the upper box body 21 along the length direction X of the battery device 100. The extending part 2312 protrudes downward along the height direction Z of the battery device 100 and forms a collecting groove 24. The collecting groove 24 is in communication with the second accommodating cavity 202.

[0222] The upper box body 21 is provided with a rib 25 on the side facing the second accommodating cavity 202. The electrical structure 40 is arranged on the rib 25, so that there is a gap between the electrical structure 40 and the bottom wall of the second accommodating cavity 202.

[0223] The one-way valve 30 is arranged at the bottom of the collecting groove 24. Fluid in the second accommodating cavity 202 can be discharged to the outside through the one-way valve 30. Impurities in the outside are difficult to enter the second accommodating cavity 202 through the one-way valve 30.

[0224] The one-way valve 30 includes a valve body 31 including a valve body 316 and a fixing member 317. The valve body 316 includes a fixed part 3162 and a base 3161. The base 3161 is located on the side of the outer shell 232 facing the outside. The fixed part 3162 penetrates through the outer shell 232 and is located in the second accommodating cavity 202. The fixing member 317 is connected to the fixed part 3162 and cooperates with the base 3161 to clamp part of the outer shell 232 between the fixing member 317 and the base 3161.

[0225] The valve body 316 is provided with a flow cavity 311, part of which is located in the fixed portion 3162 and the other part is located in the base portion 3161; the valve body 316 is also provided with a first flow channel 312, which is located on the base portion 3161, one end of the first flow channel 312 is in communication with the flow cavity 311, and the other end is in communication with the outside; the valve body 316 is also provided with a second flow channel 313, which is located on the fixed portion 3162, one end of the second flow channel 313 is in communication with the flow cavity 311, and the other end is in communication with the second containing cavity 202; the valve body 316 further comprises a limiting hole 315, which is provided in the fixed portion 3162 and located above the flow cavity 311, one end of the limiting hole 315 is in communication with the flow cavity 311, and the other end is in communication with the second containing cavity 202.

[0226] The one-way valve 30 further comprises a valve core 32, which comprises a sealing portion 321, an intermediate portion 323 and a limiting portion 322; the sealing portion 321 is located below the valve body 316, and 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 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 intermediate portion 323 is connected to the upper side of the sealing portion 321, the other end of the intermediate portion 323 extends into the second containing cavity 202 through the flow cavity 311 and the limiting hole 315, and is connected to the limiting portion 322; the maximum width of the limiting portion 322 is greater than the inner diameter of the limiting hole 315, that is, the limiting portion 322 is difficult to enter the limiting hole 315.

[0227] The limiting portion 322 and the valve body 316 are provided with an elastic member 33, which is used to apply an upward force to the limiting portion 322 to drive the sealing portion 321 to abut against the sealing surface 314 through the limiting portion 322 and the intermediate portion 323.

[0228] The flow cavity 311 is provided with an expansion member 34, which can be expanded by soaking liquid to push the sealing portion 321 away from the sealing surface 314.

[0229] In a second aspect, the embodiments of the present application also provide a power utilization device 1000, which comprises the battery device 100 provided by some embodiments of the first aspect.

[0230] In this electrical device 1000, the liquid leaking from the liquid cooling system into the second receiving cavity 202 can be discharged to the outside through the one-way valve 30, thereby reducing the damage to the electrical structure 40 of the battery device 100 caused by the liquid cooling system and thus improving the stability of the battery device 100; external impurities are difficult to enter the second receiving cavity 202, thereby reducing the damage to the electrical structure 40 caused by external impurities and thus further improving the stability of the battery device 100.

[0231] Thirdly, embodiments of this application also provide a vehicle including a battery device 100 provided in some embodiments of the first aspect, wherein the top of the housing 20 forms at least a portion of the vehicle's floor.

[0232] The top of the box 20 can serve as the entire floor of the vehicle or as only part of the vehicle floor. In this case, the side of the top of the box 20 facing the passenger compartment can be directly used to carry passengers and items. Passengers can step directly on the top of the box 20, and items can be placed directly on the top of the box 20. The vehicle can have only a partial floor structure or no floor structure, thereby reducing the overall weight of the vehicle and saving the space of the original floor structure to increase the space of the passenger compartment.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 battery device comprises: a battery cell; an electrical structure; a box body, which is internally provided with a first accommodating cavity for accommodating the battery cell and a second accommodating cavity for accommodating the electrical structure; a one-way valve connected to the box body, one end of the one-way valve being directed towards the second accommodating cavity, the other end of the one-way valve being directed towards a space outside the box body, the one-way valve being configured to guide fluid in the second accommodating cavity to the space outside the box body, and the one-way valve being further configured to block substances in the space outside the box body from entering the second accommodating cavity.

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

3. The battery device of claim 2, wherein, The upper box body comprises a dislocation part formed by being dislocated with the lower box body, and the one-way valve is arranged in the dislocation part.

4. The battery device of claim 3, wherein, The dislocation part is closer to the bottom of the lower box body than other positions of the upper box body.

5. The battery device of claim 1, wherein, The box body comprises an upper box body, a lower box body, an outer shell, and a bottom plate, the first accommodating cavity is formed between the upper box body and the lower box body, the bottom plate is fixed to the upper box body, the outer shell and the bottom plate form the second accommodating cavity, at least part of the bottom plate extends outside the upper box body, and the one-way valve is arranged on the part of the bottom plate extending outside the upper box body.

6. The battery device of claim 5, wherein, The bottom plate comprises a connecting part connected to the upper box body and an extension part, one end of the extension part being connected to the connecting part or the upper box body, and the other end of the extension part extending outside the upper box body. The one-way valve is arranged on the extension part.

7. The battery device of claim 6, wherein, The extension part protrudes towards the bottom of the lower box body to form a collection groove in communication with the second accommodating cavity, and the bottom of the collection groove is closer to the bottom of the lower box body than other positions of the outer shell and the bottom plate. The one-way valve is arranged at the bottom of the collection groove.

8. The battery device according to any one of claims 2-7, wherein, The box body further comprises a protruding rib arranged on the upper box body, the protruding rib being located in the second accommodating cavity. The electrical structure is connected to a side of the protruding rib away from the upper box body, and the electrical structure is arranged in a spaced manner with the upper box body.

9. The battery device of any one of claims 1-8, wherein, The battery device further comprises a heat exchange assembly arranged in the first accommodating cavity and / or the second accommodating cavity.

10. The battery device of any one of claims 1-9, wherein, The one-way valve comprises a valve body connected to the box body, a flow passage is formed in the valve body, and a first flow channel and a second flow channel are in communication with the flow passage, the first flow channel is further in communication with a space outside the box body, and the second flow channel is further in communication with the second accommodating cavity. The one-way valve further comprises 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.

11. The battery device of claim 10, wherein, 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, the deformation direction of the elastic member is the same as the moving direction of the valve body, and the elastic member is configured to apply a force to the valve core to close the first flow channel.

12. The battery device of claim 11, wherein, The fluid entering the flow channel 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 absorbing liquid and abut against the inner wall of the flow passage and the valve core to push the valve core to open the first flow channel. The force applied by the elastic member to the valve core is smaller than the force applied by the expansion member to the valve core.

13. The battery device according to claim 11 or 12, wherein, The valve body further comprises a sealing surface facing outward of the box, and one end of the first flow channel 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.

14. The battery device of claim 13, wherein, The valve body is provided with a guide groove on the side facing outward of the box, and the sealing part is contained in the guide groove; At least one through hole is formed in the sealing part, and the through hole is opposite to the sealing surface in the moving direction of the valve core.

15. The battery device of any one of claims 10-14, wherein, The valve body comprises a valve body main body and a fixing member, the valve body main body comprises a base and a fixed part connected to the base, the base is located outward of the box, and the fixed part penetrates through the box and is located in the second containing cavity; The fixing member is connected to the fixed part, and part of the box is clamped between the fixing member and the base.

16. The battery device of claim 15, wherein, An outer thread is formed on the outer wall of the fixed part, and the fixing member is a nut matched with the outer thread.

17. The battery device of claim 15 or 16, wherein, The fixing member is sleeved on the fixed part, and a sealing groove is formed on the side of the fixing member facing the base; A protruding part is protruded on the side of the base facing the fixing member, the protruding part is contained in the sealing groove, and the protruding part abuts against the inner wall of the sealing groove.

18. An electrical device, comprising: The battery device comprises any one of claims 1-17.

19. A vehicle, wherein, The battery device comprises any one of claims 1-17, and the top of the box forms at least part of the floor of the vehicle.

Images