Drain valve, battery device and electric device

Abstract

The utility model discloses a drain valve, a battery device and an electric device, and belongs to the technical field of batteries. The drain valve comprises a valve body, a valve element, an expansion piece and an elastic piece. The valve body is provided with a liquid inlet and a liquid outlet. The valve element is movably matched with the valve body in the first direction and seals the liquid outlet. The expansion part is arranged in the valve body and configured to be capable of absorbing liquid water to expand and deform so as to push the valve element to open the liquid outlet. The elastic piece is connected with the valve element and the valve body and used for applying elastic force to the valve element so that the valve element can be kept at the position where the liquid outlet is closed. Wherein the valve body is provided with a limiting part, the valve element is provided with a limiting matching part, and the limiting matching part is configured to make contact with the limiting part when the liquid outlet is opened so as to limit the stroke of the valve element in the first direction. The drain valve can reduce the risk of failure caused by excessive deformation of the elastic piece, and is beneficial to improving the reliability of the battery device during use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a drainage valve, a battery device and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, in addition to improving the performance of the battery device, the reliability of the battery device during use is also a problem that needs to be considered.

[0004] Therefore, how to improve the reliability of the battery device during use is a problem that needs to be solved in the battery technology. Invention content

[0005] In view of the above problems, the present application provides a drainage valve, a battery device and an electric device, which can improve the reliability of the battery device during use.

[0006] In a first aspect, the present application provides a drainage valve, the drainage valve comprising a valve body, a valve core, an expansion member and an elastic member, the valve body having a liquid inlet and a liquid outlet. The valve core is movable in a first direction and cooperates with the valve body to close the liquid outlet. The expansion member is arranged in the valve body, and the expansion member is configured to absorb liquid water to expand and deform to push the valve core to open the liquid outlet. The elastic member connects the valve core and the valve body, and is used to apply an elastic force to the valve core to keep the valve core in a position to close the liquid outlet. The valve body is provided with a limiting portion, and the valve core is provided with a limiting cooperation portion, and the limiting cooperation portion is configured to be in contact with the limiting portion when the liquid outlet is opened to limit the travel of the valve core in the first direction.

[0007] In the technical scheme of the present application, when the expansion member absorbs liquid water to expand and deform to push the valve core to open the liquid outlet, the limiting portion and the limiting cooperation portion can limit the travel of the valve core in the first direction, thereby reducing the risk of excessive deformation of the elastic member leading to failure, and improving the reliability of the battery device during use.

[0008] In one or more embodiments of the first aspect, the valve body includes a top wall and a side wall surrounding the top wall, the liquid inlet is arranged on the side wall and / or the top wall, the side wall away from the top wall is enclosed to form the liquid outlet, the valve core is arranged opposite to the top wall, the expansion member is arranged between the top wall and the valve core, and the first direction is parallel to the thickness direction of the top wall.

[0009] The liquid inlet can be arranged at any position of the circumferential direction of the side wall and / or any position of the top wall, and the opening direction of the liquid inlet can be flexibly arranged according to different products, thereby improving the adaptability of the liquid discharge valve. The first direction is parallel to the thickness direction of the top wall, the stroke of the valve core can be simulated or designed based on the top wall, and the design and assembly difficulty of the liquid discharge valve is reduced.

[0010] In one or more embodiments of the first aspect, the limiting part is a protrusion provided on the inner surface of the side wall, and the limiting matching part includes a main body part and a hanging part. The main body part is arranged on the side of the valve core facing the top wall, and the hanging part is arranged at an angle with the main body part. When viewed in the first direction, the hanging part at least partially overlaps the protrusion.

[0011] In the above scheme, when the valve core moves in the first direction, the hanging part contacts the protrusion to limit the stroke of the valve core. During assembly of the valve core, after the valve core is pushed into the valve body in the first direction, the limiting part and the limiting matching part can be matched only by rotating the valve core by a certain angle, which is high in assembly efficiency and low in assembly difficulty.

[0012] In one or more embodiments of the first aspect, the inner surface of the side wall is provided with a first groove, and at least part of the protrusion is arranged in the first groove.

[0013] In the above scheme, since at least part of the protrusion is arranged in the first groove, the protrusion occupies less space on the inner side of the valve core, a larger expansion member can be arranged, so that the liquid discharge valve can absorb more water to obtain a larger expansion force, which is beneficial to timely opening of the expansion valve. Increasing the volume of the expansion member can also make the arrangement of the liquid inlet more flexible, that is, the liquid inlet can be arranged at more positions of the valve body to make the water contact the expansion member more quickly to open the valve, thereby improving the adaptability of the expansion valve.

[0014] In one or more embodiments of the first aspect, the limiting matching part is arranged between the side wall and the expansion member.

[0015] In the above scheme, the limiting matching part has a low risk of interference with the expansion member during assembly, and the liquid discharge valve has a low assembly difficulty.

[0016] In one or more embodiments of the first aspect, the limiting part is provided with a plurality of limiting parts, the plurality of limiting parts are arranged at intervals along the circumferential direction of the side wall, the limiting matching part is provided with a plurality of limiting matching parts, and the plurality of limiting matching parts correspond one-to-one to the limiting parts.

[0017] In the above scheme, the plurality of limiting parts and the plurality of limiting matching parts can improve the stability when the limiting parts and the limiting matching parts are matched. At the same time, the plurality of limiting parts arranged at intervals along the circumferential direction of the side wall can also reduce the risk of distortion of the elastic member, thereby further reducing the risk of failure of the elastic member and further improving the reliability of the battery device in use.

[0018] In one or more embodiments of the first aspect, the elastic member is a spring. The valve core comprises a valve core body and a connecting column, the connecting column extends in the first direction, the connecting column is arranged on the side of the valve core body facing the top wall, a helical groove is arranged on the circumference of the connecting column, one end of the spring is connected to the valve body, and the other end of the spring is embedded in the helical groove.

[0019] In the above scheme, the other end of the spring is embedded in the helical groove to realize the assembly of the spring, and the assembly efficiency is high. At the same time, the risk of separation of the spring from the valve core during the movement of the valve core can be reduced, and the connection stability of the spring and the valve core can be improved.

[0020] In one or more embodiments of the first aspect, the helical groove extends to the surface of the connecting column facing the top wall.

[0021] In the above scheme, the spring can be assembled by being screwed into the helical groove from the surface of the connecting column facing the top wall, further improving the assembly efficiency of the spring and further reducing the assembly difficulty of the spring.

[0022] In one or more embodiments of the first aspect, the connecting column comprises a first segment and a second segment arranged in sequence, the second segment is connected to the valve core body, a part of the helical groove is arranged on the first segment, the first segment has a first end close to the top wall and a second end away from the top wall, and the diameter of the first segment gradually decreases from the second end to the first end.

[0023] In the above scheme, since the diameter of the first segment gradually decreases from the second end to the first end, after the spring is screwed into the helical groove from the first end, the tension generated by the circumferential deformation of the spring can connect the spring to the first segment more stably, and the connection stability between the spring and the valve core can be improved.

[0024] In one or more embodiments of the first aspect, a plurality of liquid inlets are arranged, and the plurality of liquid inlets are arranged at intervals along the circumference of the side wall.

[0025] In the above scheme, the plurality of liquid inlets arranged at intervals along the circumference of the side wall can make the leaked liquid water enter the valve body from different directions and contact the expansion member, so that the drain valve can adapt to different liquid leakage conditions.

[0026] In one or more embodiments of the first aspect, the drain valve further comprises a nut, the nut is sleeved on the valve body, the nut is threadedly connected with the side wall, and the end of the side wall away from the top wall is formed with a flange.

[0027] In the above scheme, the distance between the nut and the flange can be adjusted by screwing the nut, so that the drain valve can adapt to installation interfaces of different thicknesses, and the installation of the drain valve can be realized by screwing the nut, and the installation process is simple and convenient.

[0028] In one or more embodiments of the first aspect, the nut is provided with a plurality of notches, the notches being in communication with the liquid inlet.

[0029] In the above scheme, the leaked liquid water can pass through the notches and enter the valve body from the liquid inlet to contact the expansion member. Such an arrangement reduces the risk of the liquid inlet being blocked after the nut is screwed to complete the assembly of the drain valve.

[0030] In one or more embodiments of the first aspect, the drain valve further comprises a first sealing member arranged on the surface of the side wall facing the valve core, the first sealing member being configured to seal the gap between the surface of the side wall facing the valve core and the valve core.

[0031] In the above scheme, the arrangement of the first sealing member reduces the risk of foreign matter from outside the battery device entering the battery device through the gap between the surface of the side wall facing the valve core and the valve core, thereby improving the sealing performance of the battery device.

[0032] In one or more embodiments of the first aspect, the limiting portion does not overlap the liquid inlet.

[0033] In the above scheme, since the limiting portion does not overlap the liquid inlet, the arrangement of the limiting portion does not block the liquid inlet, and the leaked water can contact the expansion member in time, thereby enabling the drain valve to open in time.

[0034] In a second aspect, the present application provides a battery device comprising a box body and the drain valve of one or more embodiments described above, the drain valve being mounted on a wall portion of the box body and being configured to drain liquid in the box body.

[0035] In the above scheme, since the drain valve of one or more embodiments described above has a low risk of failure due to excessive deformation of the elastic member during opening, the battery device comprising the drain valve of one or more embodiments described above has high reliability in use.

[0036] In a third aspect, the present application provides a power consumption device comprising the battery device of one or more embodiments described above, the battery device being configured to provide electric energy.

[0037] In the above scheme, since the battery device of one or more embodiments described above has high reliability in use, the power consumption device comprising the battery device of one or more embodiments described above also has high reliability in use.

[0038] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the description, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0039] Various other advantages and benefits will become clear to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings provided herein are for illustrative purposes only and, therefore, should not be considered to be limiting in any way. Like reference characters in the drawings indicate like elements throughout the various figures. In the drawings:

[0040] Figure 1 Structure diagram of a vehicle for some embodiments of the present application;

[0041] Figure 2 Exploded view of a battery device for some embodiments of the present application;

[0042] Figure 3 Exploded view of a drain valve for some embodiments of the present application;

[0043] Figure 4 Structure diagram of a valve body for some embodiments of the present application;

[0044] Figure 5 Sectional view of a partial structure of a drain valve for some embodiments of the present application;

[0045] Figure 6 Sectional view of a partial structure of a drain valve for some embodiments of the present application;

[0046] Figure 7 Sectional view of a partial structure of a battery device for some embodiments of the present application;

[0047] Figure 8 Structure diagram of a second seal for some embodiments of the present application; Figure 7 Close-up view of area A in FIG. 10;

[0048] Figure 9 Structure diagram of a second seal for some embodiments of the present application.

[0049] Reference Characters in the Detailed Description of the Invention:

[0050] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - box body; 111 - first box body; 112 - second box body; 12 - battery cell; 13 - liquid discharge valve; 131 - valve body; 1311 - liquid inlet; 1312 - liquid outlet; 1313 - limiting portion; 1314 - top wall; 1315 - side wall; 1316 - first groove; 1317 - flange; 132 - valve core; 1321 - limiting fitting portion; 13211 - hanging portion; 13212 - main body portion; 1322 - valve core body; 1323 - connecting column; 13231 - first section; 13232 - second section; 133 - expansion piece; 134 - elastic piece; 135 - first sealing piece; 136 - nut; 1361 - notch; 137 - second sealing piece; 1371 - protrusion; 1372 - sealing lip; X - first direction. DETAILED DESCRIPTION

[0051] 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.

[0052] 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 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.

[0053] 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 "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0054] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0056] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously after being discharged by charging the active material.

[0057] The battery cell includes, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0058] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square cell, a blade cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0059] The battery referred to in embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0060] The battery apparatus referred to in embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0061] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a single independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0062] In some embodiments, the battery apparatus can be a battery pack including a case and one or more battery cell assemblies accommodated in the case.

[0063] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0064] As an example, the battery cell assembly can also be accommodated in the case by directly fixing a plurality of battery cells in the case.

[0065] In some embodiments, the case can be a part of the chassis structure of the vehicle. For example, a part of the case can be at least a part of the floor of the vehicle, or a part of the case can be at least a part of the cross member and the longitudinal member of the vehicle.

[0066] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0067] In order to improve the working reliability and stability of the battery device, a thermal management component is usually arranged in the box. In some cases, the thermal management component is located at the bottom of the box and is fixedly installed on the side wall of the box. In other cases, the thermal management component is located between adjacent battery monomers and is in contact with the large surface of the battery monomers. The battery monomers are generally connected to the thermal management component by a heat-conducting adhesive, so that the battery monomers and the thermal management component can exchange heat, and the temperature of the battery monomers in contact with the thermal management component changes when the temperature of the thermal management component changes.

[0068] Generally, the thermal management component has a fluid that can regulate the temperature of multiple battery monomers. The fluid can be a liquid or a gas, and the temperature regulation means heating or cooling the multiple battery monomers. In the case of cooling or reducing the temperature of the battery monomers, the thermal management component can be referred to as a cooling component, a cooling system, or a cooling plate, and the fluid contained therein can also be referred to as a cooling medium or a cooling fluid, and more specifically, as a cooling liquid or a cooling gas. In addition, the thermal management component can also be used for heating to warm up the multiple battery monomers. Optionally, the fluid can be circulated to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and glycol, or air, etc.

[0069] The development of battery technology needs to consider various design factors, such as cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and also needs to consider the reliability of the battery device in use.

[0070] For example, the drain valve is applied to the battery device. During long-term use of the battery device, the heat exchange medium such as the cooling liquid in the thermal management component may leak into the box due to poor circulation of the cooling liquid in the thermal management component, aging and failure of the sealing element of the thermal management component, damage to the pipeline of the thermal management component, etc. If the cooling liquid accumulates in the box and cannot be drained, the risk of short circuit of the battery monomers will increase, and once the battery monomers are short-circuited, the temperature of the battery will rise and the battery will catch fire. At this time, the expansion element in the drain valve arranged on the wall of the box can open the drain valve after absorbing water to drain the leaked liquid, but since the valve core stroke of the drain valve is free, the risk of excessive deformation of the elastic element during valve opening is high. If the elastic element cannot be reset due to excessive deformation, the sealing of the box will fail, the risk of foreign matter entering the interior of the battery device from the exterior of the battery device will increase, and the reliability of the battery device in use will decrease.

[0071] In view of this, the application provides a drain valve, which comprises a valve body, a valve core, an expansion member and an elastic member. The valve body has a liquid inlet and a liquid outlet. The valve core is movable in a first direction and cooperates with the valve body to close the liquid outlet. The expansion member is arranged in the valve body and is configured to absorb liquid water to expand and deform, so as to push the valve core to open the liquid outlet. The elastic member connects the valve core and the valve body and is used to apply an elastic force to the valve core, so as to keep the valve core in a position to close the liquid outlet. The valve body is provided with a limiting portion, and the valve core is provided with a limiting cooperation portion configured to be in contact with the limiting portion when the liquid outlet is opened, so as to limit the travel of the valve core in the first direction. When the expansion member absorbs liquid water to expand and deform to push the valve core to open the liquid outlet, the limiting portion and the limiting cooperation portion can limit the travel of the valve core in the first direction, thereby reducing the risk of over-deformation of the elastic member and failure of the elastic member, and facilitating improvement of the reliability of the battery device in use.

[0072] The technical solutions described in the embodiments of the application are suitable for battery monomers, battery devices and electric devices using the battery devices.

[0073] The electric device includes but is not limited to electric vehicles, electric vehicles, ships and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0074] In the following, the drain valve will be mainly applied to the battery device and used to drain the leaked liquid water coolant in the box of the battery device.

[0075] For example, Figure 1 A structural schematic diagram of a vehicle 1000 of some embodiments of the application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 can be provided with a motor 300, a controller 200 and a battery device 100 inside. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, which is used for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 in starting, navigation and operation. In another embodiment of the application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, which replaces or partially replaces fuel or natural gas to provide driving power for the vehicle 1000.

[0076] To meet different power demands, the battery device 100 can include a plurality of battery cells 12, which can be connected in series, in parallel, or in a hybrid manner. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to form a battery cell assembly, and the plurality of battery cell assemblies can be connected in series, in parallel, or in a hybrid manner to form the battery device 100. That is, the plurality of battery cells 12 can be directly connected to form the battery device 100, or the plurality of battery cells 12 can be connected to form a battery cell assembly, and the battery cell assembly can be connected to form the battery device 100.

[0077] For example, please refer to Figure 2 , Figure 2 The battery device 100 according to some embodiments of the present application is shown in an exploded view. The battery device 100 can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which has a hollow structure inside, and the plurality of battery cells 12 are contained in the box 11. As shown, the first box 111 and the second box 112 are shown here, and the first box 111 and the second box 112 are fastened together. The shapes of the first box 111 and the second box 112 can be determined according to the shapes of the plurality of battery cells 12 combined, and the first box 111 and the second box 112 can each have an open face. For example, the first box 111 and the second box 112 can each be a hollow cuboid and have only one face as an open face. The open face of the first box 111 and the open face of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are fastened to each other to form the box 11 having a closed cavity. The plurality of battery cells 12 combined in parallel, in series, or in a hybrid manner are placed in the box 11 formed by the fastening of the first box 111 and the second box 112.

[0078] Alternatively, the battery device 100 can also include other structures, which will not be described one by one here. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the current collecting component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by a conductive mechanism.

[0079] The number of battery cells 12 can be set to any value according to different power requirements. The plurality of battery cells 12 can be connected in series, in parallel, or in a mixed manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery cell assembly. The number of battery cells 12 included in the battery cell assembly is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery cell assemblies, and these battery cell assemblies can be connected in series, in parallel, or in a mixed manner.

[0080] According to some embodiments of the present application, please refer to Figures 3 to 6 The present application provides a drain valve 13, which includes a valve body 131, a valve core 132, an expansion member 133, and an elastic member 134. The valve body 131 has a liquid inlet 1311 and a liquid outlet 1312. The valve core 132 is movable along a first direction X and cooperates with the valve body 131 to close the liquid outlet 1312. The expansion member 133 is arranged in the valve body 131, and the expansion member 133 is configured to absorb liquid water to expand and deform, so as to push the valve core 132 to open the liquid outlet 1312. The elastic member 134 connects the valve core 132 and the valve body 131, and is used to apply an elastic force to the valve core 132, so that the valve core 132 is kept at a position closing the liquid outlet 1312. Wherein, the valve body 131 is provided with a limiting portion 1313, and the valve core 132 is provided with a limiting cooperation portion 1321, which is configured to be in contact with the limiting portion 1313 when the liquid outlet 1312 is opened, so as to limit the stroke of the valve core 132 in the first direction X.

[0081] The material of the valve body 131 includes but is not limited to plastic, martensitic stainless steel, iron, etc.

[0082] The material of the valve core 132 includes but is not limited to plastic, martensitic stainless steel, iron, etc.

[0083] The number of expansion members 133 can be one, such as a sleeve structure expansion member 133. The number of expansion members 133 can also be a plurality of columnar solids, and the plurality of expansion members 133 are filled in the valve body 131.

[0084] The expansion member 133 can be a granular solid or a solid with a regular shape.

[0085] In some embodiments, the expansion member 133 is a plurality of expansion members 133 arranged in sequence along the first direction X.

[0086] In some embodiments, the expansion member 133 is sleeved around the elastic member 134.

[0087] The number of elastic members 134 can be one or more.

[0088] The elastic member 134 can be a metal spring, a non-metal spring, an elastic rope, an elastic band, an elastic sheet, or the like.

[0089] The expansion member 133 can be in contact with the valve body 131 or not. The expansion member 133 can be in contact with the valve core 132 or not. As long as the expansion member 133 can push the valve core 132 to open the liquid outlet 1312 after swelling and deforming, it is acceptable.

[0090] The material of the expansion member 133 includes, but is not limited to, one or more of water-absorbing foam, water-absorbing resin, or water-absorbing fiber. For example, in some embodiments, the expansion member 133 includes a plurality of paperboards stacked along the first direction X.

[0091] In some embodiments, the expansion member 133 has a cavity inside, the limiting fitting part 1321 can move in the cavity along the first direction X, and the outer surface of the expansion member 133 is provided with a through hole, and the limiting part 1313 can be in cooperation with the limiting fitting part 1321 in the through hole.

[0092] In some embodiments, the limiting part 1313 can be a sliding groove provided on the inner surface of the valve body 131, and the limiting fitting part 1321 can be a protrusion provided on the outer circumferential surface of the valve core 132. The protrusion and the sliding groove are in sliding cooperation, and the length of the sliding groove limits the stroke of the valve core 132.

[0093] In some embodiments, the limiting part 1313 can be a protrusion provided on the inner surface of the valve body 131, and the limiting fitting part 1321 can be an elastic hook provided on the valve core 132.

[0094] In the technical solution of the embodiments of the present application, when the expansion member 133 absorbs liquid water to swell and deform to push the valve core 132 to open the liquid outlet 1312, the limiting part 1313 and the limiting fitting part 1321 can limit the stroke of the valve core 132 along the first direction X, thereby reducing the risk of over-deformation of the elastic member 134 leading to failure, and improving the reliability of the battery device 100 in use.

[0095] According to some embodiments of the present application, please refer to Figures 3 to 6 The valve body 131 includes a top wall 1314 and a side wall 1315 surrounding the top wall 1314. The liquid inlet 1311 is provided on the side wall 1315 and / or the top wall 1314. The side wall 1315 is closed at one end away from the top wall 1314 to form the liquid outlet 1312. The valve core 132 is arranged opposite to the top wall 1314. The expansion member 133 is arranged between the top wall 1314 and the valve core 132. The first direction X is parallel to the thickness direction of the top wall 1314.

[0096] Since the first direction X is parallel to the thickness direction of the top wall 1314, during the design of the stroke of the valve core 132, the top wall 1314 can be taken as a reference, and the design difficulty is relatively low.

[0097] In the above scheme, the liquid inlet 1311 can be arranged at any position in the circumferential direction of the side wall 1315 and / or any position of the top wall 1314, and the opening direction of the liquid inlet 1311 can be flexibly arranged according to different products, thereby improving the adaptability of the liquid discharge valve 13. The first direction X is parallel to the thickness direction of the top wall 1314, and the stroke of the valve core 132 can be simulated or designed by taking the top wall 1314 as a reference, thereby reducing the design and assembly difficulty of the liquid discharge valve 13.

[0098] According to some embodiments of the present application, please refer to Figures 3 to 6 The limiting portion 1313 is a protrusion provided on the inner surface of the side wall 1315, and the limiting matching portion 1321 includes a main body portion 13212 and a hanging portion 13211. The main body portion 13212 is arranged on the side of the valve core 132 facing the top wall 1314, and the hanging portion 13211 is arranged at an angle with the main body portion 13212. When viewed along the first direction X, the hanging portion 13211 at least partially overlaps the protrusion.

[0099] The protrusion can be integrally formed with the side wall 1315 or separately formed and then connected.

[0100] The hanging portion 13211 is arranged at an angle with the main body portion 13212, which means that the angle between the hanging portion 13211 and the main body portion 13212 can be 30°, 45°, 60°, 75°, 90°, etc.

[0101] When viewed along the first direction X, the hanging portion 13211 at least partially overlaps the protrusion, which means that during the movement of the valve core 132 along the first direction, when it moves to a certain position, the hanging portion 13211 will contact the protrusion to limit the continuous movement of the valve core 132.

[0102] In some embodiments, the limiting matching portion 1321 is L-shaped.

[0103] Please refer to Figures 5 to 6In the assembly of the valve core 132 and the valve body 131, the valve core 132 can be rotated counterclockwise or clockwise along the circumference of the side wall 1315 first, then the valve core 132 is pushed into the valve body 131, and then the valve core 132 is reversed to complete the assembly of the valve core 132. Such an arrangement can avoid interference between the limiting matching part 1321 and the protrusion during assembly, and is conducive to making the limiting matching part 1321 from a material with high strength, thereby improving the stability during limiting. Of course, in some other embodiments, the limiting matching part 1321 can be made of an elastic material, and the valve core 132 can be directly pushed into the valve body 131 along the first direction X. After the hanging part 13211 contacts the protrusion, it is bent close to the main body, and after the hanging part 13211 moves to the side close to the top wall 1314, it resets to complete the assembly, which is relatively low in assembly difficulty.

[0104] In the above scheme, when the valve core 132 moves along the first direction X, the hanging part 13211 contacts the protrusion to limit the stroke of the valve core 132. During assembly of the valve core 132, after the valve core 132 is pushed into the valve body 131 along the first direction X, only a certain angle of the valve core 132 needs to be rotated to realize the cooperation of the limiting part 1313 and the limiting matching part 1321, which is high in assembly efficiency and low in assembly difficulty.

[0105] According to some embodiments of the present application, please refer to Figures 3 to 6 The inner surface of the side wall 1315 is provided with a first groove 1316, and at least part of the protrusion is arranged in the first groove 1316.

[0106] In some embodiments, along the first direction X, the first groove 1316 extends to the surface of the side wall 1315 away from the top wall 1314.

[0107] In the embodiment in which a plurality of protrusions are arranged, the number of the first grooves 1316 can be a plurality, and the plurality of first grooves 1316 correspond to the plurality of protrusions one by one. Of course, the number of the first grooves 1316 can also be one, and the first groove 1316 extends along the circumference of the side wall 1315 for one turn.

[0108] In the above scheme, since at least part of the protrusion is arranged in the first groove 1316, the protrusion occupies less space inside the valve core 132, and a larger expansion element 133 can be arranged, so that the liquid discharge valve 13 can absorb more water to obtain a larger expansion force, which is conducive to timely opening of the expansion valve. Increasing the volume of the expansion element 133 can also make the arrangement of the liquid inlet 1311 more flexible, that is, the liquid inlet 1311 can be opened at more positions on the valve body 131 to make the water contact the expansion element 133 faster to open the valve, thereby improving the adaptability of the expansion valve.

[0109] According to some embodiments of the present application, please refer to Figures 3 to 6The limiting fitting part 1321 is arranged between the side wall 1315 and the expansion piece 133, meaning that the limiting fitting part 1321 has a low risk of interfering with the expansion piece 133 during assembly.

[0110] The limiting fitting part 1321 is arranged between the side wall 1315 and the expansion piece 133, meaning that the limiting fitting part 1321 has a low risk of interfering with the expansion piece 133 during assembly.

[0111] In the above scheme, the limiting fitting part 1321 has a low risk of interfering with the expansion piece 133 during assembly, and the assembly difficulty of the drain valve 13 is low.

[0112] According to some embodiments of the present application, please refer to Figures 3 to 6 The limiting part 1313 is provided in plurality, the plurality of limiting parts 1313 are arranged at intervals along the circumference of the side wall 1315, and the limiting fitting part 1321 is provided in plurality, the plurality of limiting fitting parts 1321 correspond one-to-one to the limiting parts 1313.

[0113] In some embodiments, the plurality of limiting parts 1313 are arranged at equal intervals along the circumference of the side wall 1315, for example, the number of limiting parts 1313 is three, and the limiting parts 1313 are distributed in a 120° circumferential array.

[0114] In the above scheme, the plurality of limiting parts 1313 and the plurality of limiting fitting parts 1321 are provided, which can improve the stability when the limiting part 1313 and the limiting fitting part 1321 cooperate, and at the same time, the plurality of limiting parts 1313 arranged at intervals along the circumference of the side wall 1315 can also reduce the risk of torsional deformation of the elastic piece 134, thereby further reducing the risk of failure of the elastic piece 134 and further improving the reliability of the battery device 100 in use.

[0115] According to some embodiments of the present application, please refer to Figures 3 to 6 The elastic piece 134 is a spring. The valve core 132 includes a valve core body 1322 and a connecting column 1323, the connecting column 1323 extends along the first direction X, the connecting column 1323 is arranged on the side of the valve core body 1322 facing the top wall 1314, the circumference of the connecting column 1323 is provided with a spiral groove, one end of the spring is connected with the valve body 131, and the other end of the spring is embedded in the spiral groove.

[0116] The spring can be a metal spring or a non-metal spring.

[0117] In some embodiments, the top wall 1314 is provided with a through hole, the hole wall of the through hole is provided with a protruding part, the protruding part is provided with a recess away from the side of the valve core 132, and one end of the spring is hung in the recess.

[0118] In some embodiments, the spring can be inserted along the outer circumference of the connecting column 1323, and then pressed into the spiral groove along the radial direction of the connecting column 1323.

[0119] In some embodiments, the cross section of the connecting column 1323 can be polygonal or circular, etc.

[0120] Since the other end of the spring is embedded in the spiral groove, it means that the circumferential tension of the spring will provide a certain pre-tightening force, and at the same time, the first groove 1316 will also limit the spring on the connecting column 1323 in the axial direction of the spring, so that the connection stability of the spring and the connecting column 1323 is improved.

[0121] In the above scheme, the assembly efficiency of the spring is higher by embedding the other end of the spring in the spiral groove. At the same time, it can also reduce the risk of separation of the spring and the valve core 132 during the movement of the valve core 132, which is conducive to improving the connection stability of the spring and the valve core 132.

[0122] According to some embodiments of the present application, please refer to Figures 3 to 6 , the spiral groove extends to the surface of the connecting column 1323 facing the top wall 1314.

[0123] The spiral groove extends to the surface of the connecting column 1323 facing the top wall 1314, which means that the spring can be assembled by rotating into the spiral groove from the surface of the connecting column 1323 facing the top wall 1314.

[0124] In the above scheme, the spring can be assembled by rotating into the spiral groove from the surface of the connecting column 1323 facing the top wall 1314, which further improves the assembly efficiency of the spring and further reduces the assembly difficulty of the spring.

[0125] According to some embodiments of the present application, please refer to Figures 3 to 6 , the connecting column 1323 includes a first segment 13231 and a second segment 13232 arranged in sequence, the second segment 13232 is connected to the valve core body 1322, a part of the spiral groove is arranged in the first segment 13231, the first segment 13231 has a first end close to the top wall 1314 and a second end away from the top wall 1314, and the diameter of the first segment 13231 gradually decreases from the second end to the first end.

[0126] In some embodiments, the outer peripheral surface of the first segment 13231 is a conical surface.

[0127] The diameter of the first segment 13231 gradually decreases from the second end to the first end, which means that when the diameter of the spring matches the outer diameter of the first end, the spring will expand during the rotation from the first end to the second end, and the expanded spring will generate a reverse force, that is, the circumferential force will fix the spring more tightly on the connecting part.

[0128] In the above scheme, since the diameter of the first section 13231 gradually decreases from the second end to the first end, after the spring is screwed into the spiral groove from the first end, the tensile force generated by the circumferential deformation of the spring can more stably connect the spring to the first section 13231, thereby improving the connection stability between the spring and the valve core 132.

[0129] According to some embodiments of the present application, please refer to Figures 3 to 6 The inlet 1311 is provided with a plurality of inlet openings, and the plurality of inlet openings are arranged along the circumference of the side wall 1315.

[0130] The inlet 1311 is provided with a plurality of inlet openings, and the plurality of inlet openings are arranged along the circumference of the side wall 1315, which means that the leaked liquid water in each direction of the side wall 1315 in the box 11 can flow a short distance into the valve body 131 through the inlet openings 1311, so that the drainage of the drainage valve 13 is more unobstructed.

[0131] In the above scheme, the plurality of inlet openings arranged along the circumference of the side wall 1315 can make the leaked liquid water enter the valve body 131 from different directions to contact the expansion member 133, so that the drainage valve 13 can adapt to different liquid leakage conditions.

[0132] According to some embodiments of the present application, please refer to Figures 3 to 6 The drainage valve 13 further comprises a nut 136, the nut 136 is sleeved on the valve body 131, the nut 136 is threadedly connected with the side wall 1315, and the side wall 1315 is formed with a flange 1317 away from one end of the top wall 1314.

[0133] The distance between the nut 136 and the flange 1317 can be adjusted by screwing the nut 136, so that the drainage valve 13 can be clamped between one wall of the box 11, and the wall of the box 11 is located between the nut 136 and the flange 1317.

[0134] The outer surface of the side wall 1315 is at least partially provided with threads matched with the nut 136.

[0135] Generally, the wall of the box 11 is provided with a through hole, the inlet 1311 is located in the box 11, and the flange 1317 is located outside the box 11. When installing the drainage valve 13, first, part of the side wall 1315 is placed in the box 11 through the through hole, and the flange 1317 is lapped on the wall, then the nut 136 is held by a tool or manually from the opening of the box 11 away from the above-mentioned wall and is inserted into the box 11 and screwed onto the side wall 1315, and finally after the nut 136 is tightened, the drainage valve 13 can be installed on the wall of the box 11.

[0136] In the above scheme, the distance between the nut 136 and the flange 1317 can be adjusted by screwing the nut 136, so that the drain valve 13 can be adapted to installation interfaces of different thicknesses, and the installation of the drain valve 13 can be realized by screwing the nut 136, which is simple and convenient.

[0137] According to some embodiments of the present application, please refer to Figures 3 to 6 The nut 136 is provided with a plurality of notches 1361, and the notches 1361 are in communication with the liquid inlet 1311.

[0138] In some embodiments, one end of the notch 1361 extends to the end of the nut 136 close to the flange 1317.

[0139] In some embodiments, the notch 1361 can also be arranged on the peripheral wall of the nut 136 and penetrate the nut 136.

[0140] The notch 1361 is in communication with the liquid inlet 1311, which means that after the drain valve 13 is assembled, liquid water can enter the inside of the valve body 131 through the notch 1361 and the liquid inlet 1311, so that the liquid water can contact the expansion member 133.

[0141] In the above scheme, the leaked liquid water can enter the inside of the valve body 131 through the notch 1361 and the liquid inlet 1311 and contact the expansion member 133, and such an arrangement has a lower risk of plugging the liquid inlet 1311 after the screwing of the nut 136 completes the assembly of the drain valve 13.

[0142] According to some embodiments of the present application, please refer to Figures 3 to 6 The drain valve 13 further comprises a first sealing member 135 arranged on the surface of the side wall 1315 facing the valve core 132, and the first sealing member 135 is used to seal the gap between the surface of the side wall 1315 facing the valve core 132 and the valve core 132.

[0143] The material of the sealing member can include but is not limited to rubber and the like.

[0144] In the above scheme, the arrangement of the first sealing member 135 can reduce the risk of foreign matter outside the battery device 100 entering the inside of the battery device 100 through the gap between the surface of the side wall 1315 facing the valve core 132 and the valve core 132, which is conducive to improving the sealing performance of the battery device 100.

[0145] According to some embodiments of the present application, please refer to Figures 2 to 8 The limiting portion 1313 does not overlap the liquid inlet 1311.

[0146] The limiting portion 1313 does not overlap the liquid inlet 1311, which means that the limiting portion 1313 will not block the liquid inlet 1311.

[0147] In the above scheme, since the limiting portion 1313 does not overlap with the liquid inlet 1311, the setting of the limiting portion 1313 will not block the liquid inlet 1311, and the leaked water can timely contact the expansion member 133, so that the liquid discharge valve 13 can be timely opened.

[0148] According to some embodiments of the present application, please refer to Figure 1 The present application provides a battery device 100, which comprises a box body 11 and the liquid discharge valve 13 in one or more of the above embodiments, the liquid discharge valve 13 is installed on the wall of the box body 11, and the liquid discharge valve 13 is used to discharge the liquid in the box body 11.

[0149] In some embodiments, the box body 11 can comprise a box body and a cover, the box body has an opening, and the cover closes the opening. The box body can comprise a bottom wall and a peripheral wall surrounding the bottom wall. The bottom wall is below the cover in the direction of gravity. The liquid discharge valve 13 can be arranged on the bottom wall or the peripheral wall.

[0150] Of course, the liquid discharge valve 13 can be provided with multiple liquid discharge valves 13, and the multiple liquid discharge valves 13 can be arranged on the same wall or different walls of the box body 11.

[0151] In the above scheme, since the liquid discharge valve 13 in one or more of the above embodiments has a low risk of failure due to excessive deformation of the elastic member 134 during opening, the battery device 100 comprising the liquid discharge valve 13 in one or more of the above embodiments has high reliability when used.

[0152] According to some embodiments of the present application, please refer to Figures 3-9 The present application provides a power consumption device, which comprises the battery device 100 in one or more of the above embodiments, and the battery device 100 is used to provide electric energy.

[0153] In the above scheme, since the battery device 100 in one or more of the above embodiments has high use reliability, the power consumption device comprising the battery device 100 in one or more of the above embodiments also has high reliability when used.

[0154] According to some embodiments of the present application, please refer to ​The application provides a drain valve 13, which comprises a valve body 131, a valve core 132, an expansion piece 133 and a spring. The valve body 131 comprises a top wall 1314 and a side wall 1315 surrounding the top wall 1314. A liquid inlet 1311 is arranged on the side wall 1315. An end of the side wall 1315 away from the top wall 1314 is enclosed to form a liquid outlet 1312. The valve core 132 is arranged opposite to the top wall 1314. The expansion piece 133 is arranged between the top wall 1314 and the valve core 132. A first direction X is parallel to the thickness direction of the top wall 1314. The valve core 132 is movable along the first direction X and cooperates with the valve body 131 to close the liquid outlet 1312. The valve core 132 is movable along the first direction X and cooperates with the valve body 131 to close the liquid outlet 1312. The expansion piece 133 is configured to absorb liquid water to expand and deform, so as to push the valve core 132 to open the liquid outlet 1312. The spring is connected between the valve core 132 and the valve body 131, and is used for applying an elastic force to the valve core 132, so that the valve core 132 is kept at a position for closing the liquid outlet 1312.

[0155] The protrusions arranged on the inner surface of the side wall 1315 form limiting portions 1313. The inner surface of the side wall 1315 is provided with a first groove 1316, and at least part of the protrusions are arranged in the first groove 1316. A limiting cooperation portion 1321 is arranged between the side wall 1315 and the expansion piece 133. The limiting cooperation portion 1321 comprises a main body portion 13212 and a hanging portion 13211. The main body portion 13212 is arranged on the side of the valve core 132 facing the top wall 1314. The hanging portion 13211 is arranged at an angle with the main body portion 13212. When viewed along the first direction X, the hanging portion 13211 at least partially overlaps with the protrusions. The limiting cooperation portion 1321 is configured to be in contact with the limiting portions 1313 when the liquid outlet 1312 is opened, so as to limit the stroke of the valve core 132 in the first direction X.

[0156] The limiting portions 1313 are arranged in plurality and are arranged at intervals along the circumference of the side wall 1315. The limiting cooperation portions 1321 are arranged in plurality and correspond to the limiting portions 1313 in one-to-one manner.

[0157] The valve core 132 comprises a valve core body 1322 and a connecting column 1323 extending along the first direction X, the connecting column 1323 is arranged on the side of the valve core body 1322 facing the top wall 1314, a helical groove is arranged on the circumference of the connecting column 1323, one end of the spring is connected with the valve body 131, and the other end of the spring is embedded in the helical groove. The helical groove extends to the surface of the connecting column 1323 facing the top wall 1314. The connecting column 1323 comprises a first segment 13231 and a second segment 13232 arranged in sequence, the second segment 13232 is connected to the valve core body 1322, a part of the helical groove is arranged on the first segment 13231, the first segment 13231 has a first end close to the top wall 1314 and a second end away from the top wall 1314, and the diameter of the first segment 13231 gradually decreases from the second end to the first end.

[0158] The liquid inlet 1311 is provided with a plurality of liquid inlets 1311 arranged at intervals along the circumference of the side wall 1315. The liquid outlet valve 13 further comprises a nut 136, the nut 136 is sleeved on the valve body 131, the nut 136 is threadedly connected with the side wall 1315, and the side wall 1315 is formed with a flange 1317 at the end away from the top wall 1314. The nut 136 is provided with a plurality of notches 1361, and the notches 1361 are communicated with the liquid inlets 1311.

[0159] The valve core body 1322 comprises a first part, a second part and a third part arranged in sequence along the first direction X, and the second part protrudes from the outer circumferential surface of the first part and the third part protrudes from the outer circumferential surface of the second part along the radial direction of the side wall 1315.

[0160] The flange 1317 is provided with a second groove and a third groove arranged in sequence along the first direction X, the second groove is communicated with the third groove, the second groove is arranged on the groove bottom wall of the third groove, the second groove is communicated with the cavity formed by the side wall 1315 and the top wall 1314, and when the valve core 132 closes the liquid outlet 1312, the third part is accommodated in the third groove, and the second part is accommodated in the second groove. The groove side wall 1315 of the third groove is provided with a plurality of through holes penetrating along the thickness direction thereof, and the plurality of through holes are arranged at intervals along the circumference of the side wall 1315, which can improve the liquid discharge efficiency. The third part is provided with a plurality of through holes penetrating along the thickness direction thereof, and the plurality of through holes are arranged at intervals along the circumference of the side wall 1315, which can also improve the liquid discharge efficiency.

[0161] The liquid outlet valve 13 further comprises a first sealing member 135 arranged on the surface of the side wall 1315 facing the valve core 132, and the first sealing member 135 is used to seal the gap between the surface of the side wall 1315 facing the valve core 132 and the second part.

[0162] The drain valve 13 further comprises a second sealing member 137, the flange 1317 is provided with an annular groove on the side facing the nut 136, and at least part of the second sealing member 137 is accommodated in the annular groove. The nut 136 and the flange 1317 clamp the valve body 131 to the wall portion of the tank 11, and the second sealing member 137 is used to seal the gap between the flange 1317 and the wall portion of the tank 11. The second sealing member 137 is provided with a plurality of sealing lips 1372 in the axial direction thereof. The provision of the sealing lips 1372 can improve the sealing between the flange 1317 and the wall portion of the tank 11. The outer circumferential surface of the second sealing member 137 is provided with a plurality of protrusions 1371, which are arranged at intervals in the circumferential direction of the second sealing member 137. The provision of the protrusions 1371 can cause the second sealing member 137 to be in interference fit with the groove side wall 1315 of the annular groove, further improving the sealing between the flange 1317 and the wall portion of the tank 11.

[0163] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drain valve characterized by, The valve body has a liquid inlet and a liquid outlet. The valve core is movable in the first direction and cooperates with the valve body to close the liquid outlet. The expansion member is arranged in the valve body and is configured to absorb liquid water to expand and deform to push the valve core to open the liquid outlet. The elastic member connects the valve core and the valve body to apply an elastic force to the valve core to keep the valve core in the position of closing the liquid outlet. The valve body is provided with a limiting portion, and the valve core is provided with a limiting fitting portion configured to be in contact with the limiting portion when the liquid outlet is opened to limit the travel of the valve core in the first direction. The valve body includes a top wall and a side wall surrounding the top wall, the liquid inlet is arranged on the side wall and / or the top wall, the end of the side wall away from the top wall is surrounded to form the liquid outlet, the valve core is arranged opposite to the top wall, the expansion member is arranged between the top wall and the valve core, and the first direction is parallel to the thickness direction of the top wall.

2. The drain valve according to claim 1, wherein The limiting portion is a protrusion arranged on the inner surface of the side wall, the limiting fitting portion includes a main body portion and a hanging portion, the main body portion is arranged on the side of the valve core facing the top wall, and the hanging portion is arranged at an angle with the main body portion.

3. The drain valve according to claim 2, wherein The inner surface of the side wall is provided with a first groove, and at least part of the protrusion is arranged in the first groove.

4. The drain valve according to claim 3, wherein The limiting fitting portion is arranged between the side wall and the expansion member.

5. The drain valve according to claim 2, wherein The limiting portion is provided with a plurality of limiting portions, and the limiting fitting portion is provided with a plurality of limiting fitting portions corresponding to the limiting portions.

6. The drain valve according to claim 2, wherein The elastic member is a spring.

7. The drain valve according to claim 2, wherein The valve core includes a valve core body and a connecting column, the connecting column extends in the first direction, the connecting column is arranged on the side of the valve core body facing the top wall, the connecting column is provided with a spiral groove in the circumferential direction, one end of the spring is connected with the valve body, and the other end of the spring is embedded in the spiral groove. The spiral groove extends to the surface of the connecting column facing the top wall.

8. The drain valve according to claim 7, wherein The connecting column includes a first segment and a second segment arranged in sequence, the second segment is connected to the valve core body, a part of the spiral groove is arranged in the first segment, the first segment has a first end close to the top wall and a second end away from the top wall, and the diameter of the first segment gradually decreases from the second end to the first end.

9. The drain valve according to claim 8, wherein The liquid inlet is provided with a plurality of liquid inlets arranged at intervals in the circumferential direction of the side wall.

10. The drain valve according to claim 2, wherein The drain valve further includes a nut, the nut is sleeved on the valve body, the nut is threadedly connected with the side wall, and the end of the side wall away from the top wall is formed with a flange.

11. The drain valve according to claim 2, wherein The nut is provided with a plurality of notches, and the notches are communicated with the liquid inlets.

12. The drain valve according to claim 11, wherein The drain valve further includes a first sealing member arranged on the surface of the side wall facing the valve core, and the first sealing member is used to seal the gap between the surface of the side wall facing the valve core and the valve core.

13. The drain valve according to claim 2, wherein ​ 14. The drain valve according to claim 1, wherein The limiting part does not overlap with the liquid inlet.

15. A battery device characterized by comprising: Comprising: A box; The drain valve as claimed in any one of claims 1-14, which is installed to a wall portion of the box, and which is used to drain liquid in the box.

16. An electrical device, comprising: The power consuming device comprises the battery device as claimed in claim 15, which is used to provide electric energy.

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