CN112018320B - Box for battery, electric device, method and equipment for preparing battery - Google Patents

Abstract

The embodiment of the application provides a box, a battery, an electric device, a method and equipment for preparing the battery, wherein the box comprises: the bearing plate is used for bearing the battery; the one-way gravity valve is arranged on the bearing plate; the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold; and is opened when the gravity of the liquid in the box body reaches a threshold value, so that the liquid is discharged through the one-way gravity valve. Through setting up the one-way gravity valve, liquid in the box is too much, for example when the gravity of liquid reaches the threshold value, can in time be with the liquid discharge in the box to can avoid too much liquid to be detained for a long time in the box, and then can reduce the potential safety hazard, improve the life-span of battery.

Description

Box for battery, electric device, method and equipment for preparing battery

Technical Field

The application relates to the technical field of batteries, in particular to a box body for a battery, the battery, an electric device, a method for preparing the battery and equipment.

Background

Batteries are receiving more and more attention as an important new power source. Since the battery may have a temperature change during use, the battery in the prior art is generally provided with a thermal management member to cool or heat the battery. When the heat management component cools the battery, all components in the box body, which are in contact with the heat management component, can generate condensate, and the condensate is in contact with an electrified structure in the box body to cause short circuit.

Therefore, it is required to design a case structure for preventing the condensate from causing the short circuit of the battery, so as to improve the safety of the battery.

Disclosure of Invention

The application provides a box body for a battery, the battery, an electric device, a method and equipment for preparing the battery, which can prevent condensate from causing short circuit of the battery.

A first aspect of the present application provides a case for a battery, wherein, includes:

the bearing plate is used for bearing the battery;

the one-way gravity valve is arranged on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve.

In some embodiments, the one-way gravity valve comprises:

a drain having a first through hole for draining the liquid in the tank through the first through hole when the gravity of the liquid reaches the threshold;

the movable assembly is mounted on the liquid drainage piece and can move relative to the first through hole, so that the movable assembly seals the first through hole when the gravity of the liquid in the box body is smaller than the threshold value, and the first through hole is opened when the gravity of the liquid in the box body reaches the threshold value.

In some embodiments, the container further comprises a bottom plate for connecting with the carrying plate to form a reservoir chamber, the reservoir chamber communicating with the first through hole to collect the liquid drained through the first through hole.

In some embodiments, the battery case further includes a first wall configured to be connected to the carrier plate to form a receiving cavity for receiving the battery, and the first wall is provided with a drain hole for draining liquid exceeding the height of the drain hole when the height of the liquid level of the liquid in the case in the direction of gravity is greater than or equal to the drain hole.

In some embodiments, the first wall includes a first sub-wall and a second sub-wall, wherein a cavity is formed between the first sub-wall and the second sub-wall, the first sub-wall is an inner wall of the tank body, the second sub-wall is an outer wall of the tank body, and the liquid drainage hole is arranged on the first sub-wall, so that the liquid with the height of the liquid level in the gravity direction being greater than or equal to the liquid drainage hole is collected in the cavity.

In some embodiments, the first wall further comprises a vent for communicating the inside and outside of the tank; the case further includes a condensing part for shielding the vent hole to condense gas flowing into the inside of the case through the vent hole.

In some embodiments, the condensing part is disposed at an inner surface of the case.

In some embodiments, the cabinet further includes a thermal management member for regulating the temperature of the battery, the thermal management member intersecting the first wall, a first portion of the condensation member extending along the thermal management member for attachment to the thermal management member, and a second portion of the condensation member extending along the first wall to block the vent.

In some embodiments, the condensation member comprises a hood-like structure that shields the vent.

In some embodiments, the hood-like structure is attached to the first wall in an area around the vent and has a first opening for gas to flow into the tank.

In some embodiments, the first opening is disposed in a first direction of the hood-like structure, the first direction being opposite to a direction of gravity.

In some embodiments, the first opening is also used to collect fluid leaking at a connection of a conduit of a fire protection system when the fluid leaks at the connection.

In some embodiments, a projection surface of the cap-like structure on the first wall is a U-shaped surface, a V-shaped surface, or a rectangular surface.

In some embodiments, the condensing part further comprises a flow channel for guiding condensate of the hood-like structure to the one-way gravity valve.

In some embodiments, portions of the condensing part on both sides of the flow passage are attached to the first wall.

In some embodiments, the hood-like structure has a second opening corresponding to the flow channel for directing condensate of the hood-like structure to the flow channel.

In some embodiments, the second opening is disposed in a second direction of the cap-like structure, the second direction being a direction of gravity.

In some embodiments, the one-way gravity valve is further configured to drain condensate within the flow passage out of the tank when the gravity of the condensate within the flow passage reaches the threshold value.

In some embodiments, the case further comprises: and the pressure balancing mechanism is used for balancing the pressure inside and outside the box body.

In some embodiments, the pressure balancing mechanism is disposed on the second sub-wall, and gas flowing from outside the tank into the cavity through the pressure balancing mechanism flows into inside the tank through the vent hole.

In some embodiments, the tank further includes a liquid reservoir provided on an inner surface of the tank, and the liquid reservoir is configured to collect liquid flowing into the liquid reservoir and discharge the liquid flowing into the liquid reservoir to the one-way gravity valve when a height of a liquid surface of the liquid in the tank in a gravity direction reaches a height of the liquid reservoir.

According to a second aspect of the present application, there is provided a battery comprising the case as described above, wherein the case is configured to accommodate the battery.

According to a third aspect of the present application, there is provided an electric device comprising the above battery for providing electric energy.

According to a fourth aspect of the present application, there is provided a method of manufacturing a battery, comprising:

mounting a battery on a carrier plate;

a one-way gravity valve is arranged on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold value; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve.

According to a fifth aspect of the present application, there is provided an apparatus for manufacturing a battery, comprising:

a first means for mounting the battery on the carrier plate;

the second device is used for arranging a one-way gravity valve on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold value; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve.

According to the box for the battery, the one-way gravity valve is arranged, the time for discharging the liquid in the box is determined according to the threshold value of the one-way gravity valve, when the liquid in the box is too much, the liquid in the box is discharged timely, and the phenomenon that the too much liquid stays in the box for a long time is avoided, so that the potential safety hazards such as short circuit can be reduced, and the service life of the battery is prolonged; the liquid in the box is less, when being not enough to open the one-way gravity valve, a small amount of liquid remaining in the box can also play a role in cooling the battery in the box under the condition that the safety of the battery is not influenced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1-a is a schematic structural diagram of an electrical device according to an embodiment of the present disclosure.

Fig. 1-B is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 1-C is a schematic structural view of a battery module according to an embodiment of the present disclosure.

Fig. 1-D is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure.

Fig. 2 is a partial structural schematic diagram of the inside of a box for a battery according to an embodiment of the present application.

Fig. 3 is a schematic cross-sectional view taken along a-a in fig. 2 according to an embodiment of the present disclosure.

Fig. 4 is a first schematic cross-sectional view of a one-way gravity valve according to an embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of a one-way gravity valve according to an embodiment of the present application.

Fig. 6 is an exploded view of a one-way gravity valve according to an embodiment of the present application.

Fig. 7 is a partial schematic view of a first box according to an embodiment of the present application.

Fig. 8 is a partial schematic view of a second box according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a condensing unit according to an embodiment of the present disclosure.

Fig. 10 is a schematic structural diagram of another condensing unit according to an embodiment of the present disclosure.

Fig. 11 is a schematic structural diagram of another condensation unit according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of a pressure balance mechanism according to an embodiment of the present application.

Fig. 13 is a schematic structural view of a liquid storage member according to an embodiment of the present disclosure.

Fig. 14 is a flow chart of a method of manufacturing a battery according to an embodiment of the present application.

Fig. 15 is a block diagram of an apparatus for manufacturing a battery according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative of the present application, and are not intended to limit the scope of the present application, and therefore: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

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

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 application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

In order to clearly describe the respective orientations in the following embodiments, terms of orientation may be used, for example, the directions of the respective orientations of the battery are defined as a coordinate system in fig. 1-D, the x direction represents the length direction of the battery cell 400, the y direction is perpendicular to the x direction in the horizontal plane, represents the width direction of the battery cell 400, and the z direction is perpendicular to the x direction and the y direction, and represents the height direction of the battery. Further, the expressions of the directions indicated for explaining the operation and configuration of each member of the battery of the present embodiment, such as the x direction, the y direction, and the z direction, described above are not absolute but relative, and although these indications are appropriate when each member of the battery is in the position shown in the drawings, when the positions are changed, the directions should be interpreted differently to be changed correspondingly.

With the same orientation in mind, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship illustrated in the drawings for convenience in describing the present application and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

The rechargeable battery may be referred to as a secondary battery or a power battery, and at present, a relatively widely used rechargeable battery is a lithium battery, for example, but not limited to, a lithium-sulfur battery, a sodium lithium-ion battery, or a magnesium-ion battery. For convenience of description, the rechargeable battery may be collectively referred to herein as a battery.

The safety characteristic of the battery is an important characteristic of the battery, and the safety of the battery needs to be ensured as much as possible when the battery is used or charged.

The battery is generally formed by connecting and combining a plurality of battery cells, and the battery cells can change temperature during the use process. When the temperature is too high, the battery monomer is required to be cooled through the heat management component, so that the accidents that the battery monomer is invalid and out of control due to too high temperature of the battery monomer, even explosion and the like are caused are avoided.

However, when the liquid in the heat management member or the like cools the battery inside the case through the duct, condensate is easily formed on the wall of the duct due to a temperature difference between the temperature of the liquid and the gas inside the case. When a large amount of condensate and the battery coexist in the same box body, safety problems such as short circuit and the like easily occur, and the service life of the battery is seriously influenced. To solve the above problems, the inventors coated the conductive member in the case with an insulating material to prevent the conductive member from contacting the condensate to cause a short circuit, but the inventors found that such coating was difficult to completely cover the conductive member, and was more difficult for the conductive member having an irregular shape. Based on this, the inventors tried to discharge excessive condensate cooled by the thermal management part of the cabinet from the cabinet to solve safety problems such as short circuit.

In view of this, the present application provides a box for a battery, so as to discharge the condensate inside the battery, avoid the condensate gathering for a long time inside the battery and bring the potential safety hazard. The box for the battery not only can timely discharge the condensate inside the battery, but also can enable the condensate outside the pipe wall of the pipeline connected with the heat management component to be in the position convenient for discharging, thereby further reducing the influence of the condensate on the battery, and reducing the risk of short circuit of the battery monomer due to too much condensate.

The battery in the embodiment of the application can be applied to various electric devices which can provide power sources by electric energy. The electric device can be, but is not limited to, an electric automobile, an electric train, an electric bicycle, a golf cart, an unmanned aerial vehicle, a ship, or the like. The electric device may be a device powered by a battery alone or a hybrid device. The battery provides electric energy for the power consumption device to drive electric actuator through the motor and advance.

For example, as shown in fig. 1-a, which is a schematic structural diagram of an electric device according to an embodiment of the present application, the electric device may be an automobile, the automobile may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile. The automobile includes a battery 200, a controller 210, and a motor 220. The battery 200 is used to supply power to the controller 210 and the motor 220 as an operation power source and a driving power source of the automobile, for example, the battery 200 is used for a power demand for operation at the start, navigation and running of the automobile. For example, the battery 200 supplies power to the controller 210, the controller 210 controls the battery 200 to supply power to the motor 220, and the motor 220 receives and uses the power of the battery 200 as a driving power source of the automobile, instead of or in part replacing fuel or natural gas to provide driving power for the automobile.

In order to achieve higher functions of the battery to meet the use requirement, the battery 200 may include a plurality of battery modules electrically connected to each other, as shown in fig. 1-B, the battery 200 includes a first case 201, a second case 202, and a plurality of battery modules 300, wherein the first case 201 and the second case 202 are fastened to each other, and the plurality of battery modules 300 are arranged in a space enclosed by the first case 201 and the second case 202. In some embodiments, the first case 201 and the second case 202 are hermetically connected.

As shown in fig. 1-C, the battery module 300 includes a plurality of battery cells 400, and the plurality of battery cells 400 may be electrically connected in series, in parallel, or in series-parallel to achieve a larger current or voltage, wherein the series-parallel refers to a combination of series connection and parallel connection. For example, as shown in fig. 1-C, the battery cells 400 may be placed upright, the height direction of the battery cells 400 coincides with the z-direction, the length direction of the battery cells 400 coincides with the x-direction, and a plurality of battery cells 400 are arranged side by side in the y-direction along the width direction thereof; alternatively, the battery cells 400 may be laid flat, the width direction of the battery cells 400 is consistent with the z direction, the length direction of the battery cells 400 is consistent with the x direction, and the plurality of battery cells 400 may be stacked in the z direction in at least one layer, each layer including a plurality of battery cells 400 arranged at intervals in the x direction.

In order to make it clear to those skilled in the art of the improvement of the present application, the overall structure of the battery cell 400 will be described first.

As shown in fig. 1-D, the battery cell 400 includes a case 40, an electrode assembly 30, and an end cap assembly 10, the end cap assembly 10 includes an end cap plate 10 ', the end cap plate 10' is connected (e.g., welded) to the case 40 to form a housing of the battery cell 400, the electrode assembly 30 is disposed in the case 40, and the case 40 is filled with an electrolyte. The battery cell 400 may have a cubic shape, a rectangular parallelepiped shape, or a cylindrical shape.

The electrode assembly 30 may be provided singly or in plurality according to the actual use requirement. As shown in fig. 1-D, at least two independently wound electrode assemblies 30 may also be provided within the cell. The electrode assembly 30 may form the main body part by winding or stacking a first pole piece, a second pole piece, and a separator between the adjacent first and second pole pieces together, wherein the separator is an insulator between the adjacent first and second pole pieces. In this embodiment, the first pole piece is exemplarily described as a positive pole piece, and the second pole piece is a negative pole piece. The positive active material is coated on the coating region of the positive electrode tab, and the negative active material is coated on the coating region of the negative electrode tab. A plurality of uncoated regions extending from the coated region of the body portion are laminated as tabs. The electrode assembly 30 includes two tabs 301, i.e., a positive electrode tab and a negative electrode tab. The positive tab extends from the coated area of the positive pole piece and the negative tab extends from the coated area of the negative pole piece.

The end cap assembly 10 is disposed on top of the electrode assembly 30, and as shown in fig. 1-D, the end cap assembly 10 includes an end cap plate 10 'and two electrode terminals 5, the two electrode terminals 5 are a positive electrode terminal and a negative electrode terminal, respectively, one connecting member 20 is disposed corresponding to each electrode terminal 5, and the connecting member 20 is located between the end cap plate 10' and the electrode assembly 30.

For example, a tab 301 of the electrode assembly 30 is located at the top in fig. 1-D, and a positive tab is connected to a positive terminal through one connecting member 20 and a negative tab is connected to a negative terminal through the other connecting member 20. Alternatively, the battery cell 400 may include two end cap assemblies 10 disposed at both ends of the case 40, respectively, and one electrode terminal 5 is disposed on each of the end cap assemblies 10.

The end cover plate 10' may further be provided with an explosion-proof member, so that when too much gas is in the battery cell 400, the gas in the battery cell 400 is released in time to avoid explosion.

The end cover plate 10 'is provided with an exhaust hole which can be arranged at the middle position of the end cover plate 10' along the length direction. The explosion-proof component comprises a pressure relief mechanism 6, the pressure relief mechanism 6 is arranged on the exhaust hole, the pressure relief mechanism 6 is hermetically arranged on the exhaust hole in a normal state, when the single battery 400 expands to enable the air pressure in the shell to rise to exceed a preset value, the pressure relief mechanism 6 is actuated to be opened, and the air is released outwards through the pressure relief mechanism 6.

The pressure relief mechanism 6 refers to an element or a component that can be actuated to release internal pressure and/or internal substances when the internal pressure or internal temperature of the battery cell 400 reaches a predetermined threshold. The pressure relief mechanism 6 may specifically take the form of, for example, an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or configuration, that is, when the internal pressure or temperature of the battery cell 400 reaches a predetermined threshold value, the pressure relief mechanism 6 performs an action or a weak structure provided in the pressure relief mechanism 6 is broken, thereby forming an opening or a passage through which the internal pressure can be released. The threshold referred to in this application may be a pressure threshold or a temperature threshold, and the design of the threshold may be different according to design requirements, for example, the threshold may be designed or determined according to an internal pressure or an internal temperature value of the battery cell 400, which is considered to be at risk of danger or runaway. Also, the threshold may depend on the materials used for one or more of the positive electrode tab, the negative electrode tab, the electrolyte, and the separator in the battery cell 400, for example.

The "actuation" referred to in this application means that the pressure relief mechanism 6 is activated or activated to a state such that the internal pressure of the battery cell 400 is relieved. The actions generated by the pressure relief mechanism 6 may include, but are not limited to: at least a portion of the pressure relief mechanism 6 ruptures, fractures, is torn or opened, or the like. When the pressure relief mechanism 6 is activated, the high-temperature and high-pressure substance inside the battery cell 400 is discharged as an exhaust from the activated portion. In this way, the battery cell 400 can be vented under controlled pressure or temperature, thereby avoiding potentially more serious accidents. Emissions from the battery cell 400 referred to in this application include, but are not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like. The high-temperature and high-pressure exhaust is exhausted toward the direction of the battery cell 400 in which the pressure relief mechanism 6 is provided, and may be more specifically exhausted in the direction toward the region where the pressure relief mechanism 6 is actuated, and the power and destructive power of such exhaust may be large, and may even be sufficient to break through one or more structures in that direction.

In some embodiments, as shown in fig. 1-D, the end cap plate 10 'is provided with a through hole for injecting an electrolyte into the battery cell 400, and the through hole may be a circular hole, an elliptical hole, a polygonal hole, or another hole, and may extend in the height direction of the end cap plate 10'. The end cover plate 10' is provided with a liquid injection member 2 for sealing the through hole.

As shown in fig. 2 and 3, the case 500 for the battery 200 provided in the embodiment of the present application includes a loading plate 510 and a one-way gravity valve 520, wherein the loading plate 510 is mainly used for loading the battery 200, and the one-way gravity valve 520 is disposed on the loading plate 510 and configured to be closed when the gravity of the liquid in the case 500 is less than a threshold value; and opens when the gravity of the liquid within the tank 500 reaches a threshold value to allow the liquid to drain through the one-way gravity valve 520.

The box 500 that this application embodiment provided, through setting up one-way gravity valve 520, liquid in the box is too much, for example when the gravity of liquid reaches the threshold value, can in time be with the liquid discharge in the box 500 to can avoid too much liquid to be detained in the box 500 for a long time, thereby can reduce the potential safety hazard, improve battery 200's life-span.

It should be noted that, in addition to the condensate generated from the outer wall of the pipe connected to the thermal management component, the liquid in the case 500 also contains the emissions released when the pressure relief mechanism 6 on the battery cell 400 is actuated, and both the condensate and the emissions may be retained in the case 500, which may affect the service life of the battery 200 and may even bring about a safety hazard. This application embodiment can in time discharge the liquid in the box 500 through set up one-way gravity valve 520 in the box, avoids above-mentioned liquid to be detained in the box 500 for a long time, and then can improve battery 200's life and safety in utilization.

In the embodiment, the loading plate 510 for loading the battery 200 is generally disposed at the bottom of the case 500, and therefore, the one-way gravity valve 520 disposed on the loading plate 510 is also disposed at the bottom of the case 500, thereby facilitating the drainage of the liquid in the case 500.

As shown in fig. 2 and 3, in the embodiment of the present invention, the one-way gravity valve 520 may be disposed near a sidewall of the case 500, in which a via hole for passing a pipe connected to the thermal management part is formed, and condensate is more easily generated at an outer wall of the pipe near the via hole. Accordingly, the one-way gravity valve 520 is disposed adjacent to the via hole, thereby facilitating the drainage of condensate.

In practical application, the size of the threshold value can be set according to actual needs, and the structure and the size of the one-way gravity valve 520 can be determined according to the size of the threshold value, so that the requirement of liquid drainage inside the box body 500 is met. The embodiment of the present application is not particularly limited to this.

It should be noted that the structure for discharging liquid used in the embodiment of the present application is the one-way gravity valve 520 related to gravity, and thus the threshold value is also a value related to gravity.

It should also be noted that, in addition to the embodiment of the present application that discharges liquid through the one-way gravity valve 520, other structures may be adopted to discharge liquid in the tank 500, and any structure that facilitates the discharge of liquid in the tank 500 falls within the scope of the embodiments of the present application.

As shown in fig. 4 and 5, as an example, in the embodiment of the present application, the one-way gravity valve 520 is used, and the one-way gravity valve 520 includes a drain 521 and a movable assembly 522, wherein the drain 521 has a first through hole 523, and the drain 521 is used for draining the liquid such as the condensate and the drainage through the first through hole 523 when the gravity of the liquid in the tank 500 reaches a threshold value. The movable element 522 is mounted on the drainage element 521 and is capable of moving relative to the first through hole 523, so that the movable element 522 seals the first through hole 523 when the gravity of the liquid in the box 500 is smaller than the threshold value, and opens the first through hole 523 when the gravity of the liquid in the box 500 reaches the threshold value.

Fig. 4 shows a state in which the movable member 522 seals the first through hole 523 when the gravity of the liquid in the tank 500 is less than the threshold value, so as to seal the tank 500 when the liquid in the tank 500 is small or no liquid is required to be discharged; fig. 5 shows a situation that the movable assembly 522 opens the first through hole 523 when the gravity of the liquid in the tank 500 reaches a threshold value, so that when the liquid in the tank 500 needs to be drained more, the first through hole 523 is opened to facilitate the drainage of the liquid, thereby preventing the liquid from being retained in the tank 500 for a long time and affecting the normal use of the battery 200.

In practical applications, the specific location of the movable element 522 may be various, for example, the movable element 522 may be disposed at the bottom of the first through hole 523, and may also be disposed on a sidewall of the first through hole 523, which is not particularly limited in this embodiment of the application.

In the present embodiment, with continued reference to fig. 4 and 5, the drain 521 may have a receiving cavity 524, and the movable element 522 may be disposed in the receiving cavity 524 and may move up and down in the receiving cavity 524. The movable member 522 moves up and down in the accommodating chamber 524 to seal or open the first through hole 523.

In practical applications, since the movable member 522 needs to seal and open the first through hole 523 inside the accommodating chamber 524, the accommodating chamber 524 needs to communicate with the first through hole 523, so that the liquid flowing into the first through hole 523 can flow through the accommodating chamber 524 for the liquid to be discharged.

In practical applications, the accommodating cavity 524 may be disposed at the bottom of the first through hole 523 and may also be disposed in the middle of the first through hole 523, and a central axis of the accommodating cavity 524 may be coaxial with a central axis of the first through hole 523, so as to facilitate the movable assembly 522 to be aligned with the first through hole 523, so as to achieve a better sealing effect.

In practical applications, the movable component 522 may have various structural forms, as long as the movable component can movably seal or open the first through hole 523 under the action of gravity. The embodiment of the present application is not particularly limited to this.

As shown in fig. 6, in the embodiment of the present application, the movable assembly 522 further includes a sealing member 5221 and an elastic member 5222, wherein the sealing member 5221 is movably connected in the accommodating cavity 524 to seal or open the first through hole 523. The elastic member 5222 is used to provide a predetermined supporting force to the sealing member 5221, the magnitude of the predetermined supporting force being the same as the threshold value, so that the sealing member 5221 can seal the first through hole 523 when the gravity of the liquid in the tank 500 is smaller than the predetermined supporting force; and opens the first through hole 523 when the gravity of the liquid in the case 500 reaches a predetermined supporting force, so that the liquid can be discharged.

In this embodiment, as a simple connection manner, the sealing member 5221 can be directly connected with the elastic member 5222, and the elastic member 5222 directly supports the sealing member 5221 so as to provide a predetermined supporting force to the sealing member 5221.

In practical applications, the sealing member 5221 can be a sealing gasket or other structure with a cross-sectional area larger than that of the first through hole 523, the elastic member 5222 can be a spring, an upper end of the spring is connected to the sealing member 5221, and a lower end of the spring is supported on the spring seat 5223. Spring base 5223 can play fixed spacing effect to the lower extreme of spring, avoids the spring to take place the distortion and influence the centering of sealing member 5221 and first through-hole 523 at flexible in-process, reduces the influence to sealed effect. In addition, the spring seat 5223 is required to be provided with a second through hole 5224, so that the liquid flowing into the accommodating chamber 524 can be discharged from the second through hole 5224.

The box 500 that this application embodiment provided still includes bottom plate 530, and bottom plate 530 is used for being connected in order to form the water storage chamber with loading board 510, and the water storage chamber communicates with first through-hole 523 to collect the liquid of discharging through first through-hole 523, avoid liquid from box 500 flow out the back direct flow to the power consumption device who uses battery 200 on, and then bring the safety risk.

In practice, the bottom plate 530 can be removably coupled to the carrier plate 510, and when a desired amount of fluid is present in the reservoir, the bottom plate 530 can be removed to drain the fluid from the reservoir. The bottom plate 530 may be provided with a liquid outlet, which is sealed by a detachable sealing plug, so that the sealing plug is opened when necessary to discharge the liquid in the water storage chamber.

As shown in fig. 2, in the embodiment of the present application, the case 500 further includes a first wall 540, the first wall 540 is configured to be connected to the loading plate 510 to form a receiving cavity for receiving the battery 200, a liquid discharge hole 5403 is formed on the first wall 540, and the liquid discharge hole 5403 is used for discharging liquid exceeding the height of the liquid discharge hole 5403 when the height of the liquid level of the liquid in the case 500 in the gravity direction is greater than or equal to the height of the liquid discharge hole 5403. So as to avoid the situation that the requirement for timely and rapid discharging of the liquid cannot be met only by using the one-way gravity valve 520 when the liquid in the tank 500 is too much, thereby ensuring that the liquid in the tank 500 can be discharged in time.

In practical applications, the position of the drain hole 5403 can be set according to practical situations, for example, the drain hole 5403 is disposed at a position of the first wall 540 close to the carrier plate 510, and the like, which is not particularly limited in the embodiment of the present application. The shape of the drain hole 5403 may be circular, elliptical, semicircular, or the like, and the size of the drain hole 5403 may be determined according to the size of the case 500, which is not particularly limited in the embodiment of the present application.

Fig. 7 shows a schematic structural diagram of the liquid discharge holes 5403 on the first wall 540, in this embodiment, the first wall 540 includes a first sub-wall 5401 and a second sub-wall 5402, wherein a cavity is formed between the first sub-wall 5401 and the second sub-wall 5402, the first sub-wall 5401 is an inner wall of the tank 500, the second sub-wall 5402 is an outer wall of the tank 500, and the liquid discharge holes 5403 are provided on the first sub-wall 5401, that is, the liquid discharge holes 5403 only penetrate through the first sub-wall 5401 of the first wall 540, so that liquid with a height of a liquid level greater than or equal to that of the liquid discharge holes 5403 in a gravity direction is collected in the cavity, and thus liquid in the tank 500 can be discharged in time.

As shown in fig. 8, the first wall 540 further includes a vent hole 5404, and the vent hole 5404 is used for communicating the inside and the outside of the box body 500. In practical applications, the drain hole 5403 may be a part of the vent hole 5404, so as to perform a function of draining liquid and a function of ventilating.

As shown in fig. 2, in the embodiment of the present application, the box 500 further includes a condensation member 550, and the condensation member 550 may be used to shield the vent hole 5404 (i.e., shield the position of the liquid discharge hole 5403) to condense the gas flowing into the box 500 through the vent hole 5404. The gas flowing into the box 500 can be condensed in advance through the condensing part 550, so that the condensed liquid can be collected at a designated position, and when the gas is prevented from being dispersed into the box 500 and condensed, the condensed liquid is dispersed to each position in the box 500, so that the purpose of collecting the condensate is achieved, and the discharge of the condensate is facilitated.

In the embodiment of the present application, the condensation unit 550 is disposed on the inner surface of the box 500 opposite to the vent hole 5404, so that when the gas flows in from the vent hole 5404, the gas contacts the condensation unit 550 at the first time, thereby preventing the gas from condensing in the box and contacting with the conductive member inside the box.

In practical applications, as shown in fig. 3, the case 500 further includes a thermal management component 560, the thermal management component 560 is used for regulating the temperature of the battery 200, and the thermal management component 560 intersects the first wall 540 to enter the inside of the case 500 through the first wall 540, so as to regulate the temperature of the battery 200. The thermal management unit 560 may be a water-cooling plate, and the like, which is not particularly limited in this embodiment of the present application.

With continued reference to fig. 3, in the embodiment of the present application, a first portion of the condensation member 550 extends along the thermal management member 560 to be attached to the thermal management member 560, so that the condensation member 550 can perform heat transfer with the thermal management member 560, and thus the condensation member 550 has a good condensation effect. The second portion of the condensation member 550 extends along the first wall 540 to shield the vent hole 5404, so that condensate condensed from the gas entering from the vent hole 5404 is also collected in the condensation member 550, and the condensate is prevented from flowing to other positions of the box 500, which is beneficial to discharge of the condensate.

In practical applications, the condensing part 550 may have various structural forms, and in the embodiment of the present application, the condensing part 550 may be a hood-shaped structure, which may shield the vent hole 5404, so that the gas entering from the vent hole 5404 may contact the hood-shaped structure and condense on the hood-shaped structure, and the condensed condensate may be collected at the condensing part 550 along the hood-shaped structure.

In the embodiment of the present application, the space enclosed by the condensing part 550 and the box 500 is communicated with the first through hole 523 of the one-way gravity valve 520, so that the condensate collected in the condensing part 550 can flow to the one-way gravity valve 520, and is discharged from the first through hole 523 when the gravity of the liquid reaches the threshold value.

With continued reference to fig. 2 and 8, a condensation member 550 of a hood-like structure is attached to the first wall 540 in the area around the vent holes 5404 and has a first opening 5501 for gas to flow into the tank 500. The gas condensed in the hood-like structure can enter the case 500 through the first opening 5501. Because the gas is condensed once, the probability of recondensing the gas entering the box body 500 is reduced, and even if the gas is condensed, the generated condensate liquid is not too much to bring potential safety hazards.

In the embodiment of the present application, the first opening 5501 is disposed in a first direction of the cap structure, and the first direction is opposite to the direction of gravity.

In practical applications, in order to prevent the high-temperature and high-pressure emissions discharged from the inside of the battery cell 400 from causing greater damage when the battery cell 400 is thermally runaway, a fire protection system is generally disposed inside the case 500 to protect the battery cell 400 from fire.

In this embodiment, the position of the first opening 5501 may be opposite to the connection of the pipeline of the fire protection system, and when the connection of the pipeline of the fire protection system leaks fluid, the first opening 5501 may collect the fluid leaked from the connection of the pipeline of the fire protection system, so as to prevent the fluid leaked from the connection of the pipeline of the fire protection system from flowing into the box 500 and affecting the battery 200.

In practical applications, the first opening 5501 may be sized to be larger to catch fluid leaking from the connection of the pipes of the fire protection system, and the embodiment of the present application is not limited to specific dimensions.

In practical applications, the projection surface of the cap-shaped structure on the first wall 540 may have various shapes, such as a rectangular surface as shown in fig. 9, a U-shaped surface as shown in fig. 10, a V-shaped surface as shown in fig. 11, and the like, which is not particularly limited in the embodiment of the present application. And the specific size of the cover-like structure may be determined according to the size of the space that can be accommodated by the actual box 500, which is not particularly limited in the embodiment of the present application.

As shown in fig. 9-11, the hood-shaped structure of the condensing part 550 is further provided with a flow channel 5502, and the flow channel 5502 is used for guiding the condensate in the hood-shaped structure to the one-way gravity valve 520. The condensing part 550 is attached to the first wall 540 at portions of both sides of the flow channel 5502.

In practical applications, the above-mentioned attachment may be a plurality of connection manners such as welding, gluing, etc., and this is not limited in the embodiments of the present application.

In the embodiment of the present application, the hood-shaped structure has a second opening 5503 corresponding to the flow channel 5502, the second opening 5503 is used for guiding the condensate in the hood-shaped structure to the flow channel 5502, and flows into the one-way gravity valve 520 through the flow channel 5502, and the one-way gravity valve 520 is further used for discharging the condensate in the flow channel 5502 out of the tank 500 when the gravity of the condensate in the flow channel 5502 reaches the above threshold value. The second opening 5503 is disposed in a second direction of the cap-shaped structure, and the second direction is a gravity direction.

In practical applications, the flow channel 5502 may be designed as a thin strip to increase the height of the flow channel, so as to increase the pressure of the liquid, thereby ensuring that the liquid in the flow channel can reach the threshold of the one-way gravity valve 520 and timely open the one-way gravity valve 520.

As shown in fig. 12, the case 500 further includes a pressure balancing mechanism 570, and the pressure balancing mechanism 570 is used to balance pressures inside and outside the case 500. In practical applications, the pressure balancing mechanism 570 may be installed on the case body at the vent hole 5404, and the external air of the case body 500 may flow into the inside of the case body 500 through the pressure balancing mechanism 570.

As shown in fig. 13, in the embodiment of the present application, the tank 500 further includes a liquid storage 580 disposed on an inner surface of the tank 500, and configured to collect liquid flowing into the liquid storage 580 when a height of a liquid level of the liquid in the tank 500 in a gravity direction reaches a height of the liquid storage 580, and discharge the liquid flowing into the liquid storage 580 to the one-way gravity valve 520.

In practical application, the liquid storage member 580 includes a height limiting plate 5801 and a guide plate 5802, the height limiting plate 5801 is in contact with the inner surface of the first sub-wall 5401, and a liquid height limiting cavity 5803 with an opening at the top in the gravity direction is formed between the height limiting plate 5801 and the first sub-wall 5401; wherein the liquid level limiting chamber 5803 is configured for flowing in liquid when the surface of the liquid is higher than the liquid level limiting chamber 5803 in the direction of gravity. The guide plate 5802 is in contact with the surface of the bearing plate 510 facing the battery cell 400, a guide channel is arranged between the guide plate 5802 and the bearing plate 510, and two ends of the guide channel are respectively communicated with the liquid height limiting cavity 5803 and the one-way gravity valve 520; wherein, the flow guide channel is used for discharging the liquid in the liquid height limiting cavity 5803 to the one-way gravity valve 520.

On the other hand, the present application also provides a battery, wherein the battery 200 comprises the above-mentioned case 500, and the case 500 is used for accommodating the battery 200. The specific structural form and the working principle of the box 500 have been described in detail in the above embodiments, and this embodiment is not described again.

In summary, in the battery 200 provided in the embodiment of the present application, the box body 500 is provided with the one-way gravity valve 520, and the time for discharging the liquid in the box body 500 is determined according to the threshold value of the one-way gravity valve 520, so that when the liquid in the box body 500 is too much, the liquid in the box body 500 is discharged timely, thereby reducing the potential safety hazard and prolonging the service life of the battery 200; when the liquid in the box 500 is less and is not enough to open the one-way gravity valve 520, the small amount of liquid left in the box 500 can also play a role in cooling the battery 200 in the box 500 without affecting the safety of the battery 200.

On the other hand, the present application further provides an electric device, which includes the above battery 200, and the battery 200 is used for providing electric energy. Wherein, battery 200 sets up in box 500, and box 500 can in time discharge inside liquid, avoids liquid to be detained for a long time and brings the safety hidden danger in box 500. The specific structural form and the working principle of the box 500 have been described in detail in the above embodiments, and this embodiment is not described again.

The battery and the electric device according to the embodiments of the present application are described above, and the method and the apparatus for manufacturing the battery according to the embodiments of the present application will be described below, wherein portions not described in detail may be referred to the foregoing embodiments.

On the other hand, embodiments of the present application also provide a method for preparing a battery, which may include the following steps, as shown in fig. 14.

Step S1410, the battery is mounted on the carrier plate.

Step S1420, providing a one-way gravity valve on the carrier plate, wherein the one-way gravity valve is configured to close when the gravity of the liquid in the tank is less than a threshold value; and is opened when the gravity of the liquid in the box body reaches a threshold value, so that the liquid is discharged through the one-way gravity valve.

Referring to the embodiment of the case 500, it can be seen that the battery 200 is disposed in the case 500, and when the liquid in the case 500 is relatively large, the liquid can be discharged through the one-way gravity valve 520 disposed in the case 500, so that the potential safety hazard can be reduced, and the service life of the battery 200 can be prolonged.

As can be seen with reference to the embodiment of the portion of the tank 500, the tank 500 also comprises other components which can be manufactured by corresponding methods in order to finally obtain the tank 500 which facilitates the draining of the liquid as desired. In practical applications, any method that can manufacture the related components and connect the related components falls within the protection scope of the embodiments of the present application, which are not described in detail herein.

In another aspect, the present application also provides an apparatus for manufacturing a battery, and referring to fig. 15, a block diagram of an apparatus for manufacturing a battery according to an embodiment of the present application is shown. As shown in fig. 15, the apparatus 1500 for manufacturing a battery may include: a first device 1510 and a second device 1520.

A first means 1510, which can be used to mount the battery on a carrier plate that is part of the housing, is located at the bottom of the housing.

A second means 1520, can be used to provide a one-way gravity valve in the carrier plate.

Wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold; and is opened when the gravity of the liquid in the box body reaches a threshold value, so that the liquid is discharged through the one-way gravity valve.

The details of each battery manufacturing apparatus are described in detail in the corresponding case embodiments for the battery, and therefore, the details are not repeated here.

The above-mentioned subject matters and features of the embodiments of the present application can be referred to each other, and those skilled in the art can flexibly combine technical features of different embodiments to form further embodiments when the structure allows.

The battery, the electric device, the method for preparing the battery and the equipment provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are merely provided to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (23)

1. A case for a battery, comprising:

the bearing plate is used for bearing the battery;

the one-way gravity valve is arranged on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve;

the battery box further comprises a first wall, wherein the first wall is configured to be connected with the bearing plate to form an accommodating cavity for accommodating the battery, a liquid discharging hole is formed in the first wall, and the liquid discharging hole is used for discharging liquid exceeding the height of the liquid discharging hole when the height of the liquid level of the liquid in the box body in the gravity direction is larger than or equal to the height of the liquid discharging hole;

the first wall comprises a first sub-wall and a second sub-wall, a cavity is formed between the first sub-wall and the second sub-wall, the first sub-wall is the inner wall of the box body, the second sub-wall is the outer wall of the box body, and the liquid drainage hole is formed in the first sub-wall, so that the liquid with the height of the liquid level in the gravity direction larger than or equal to that of the liquid drainage hole is collected in the cavity.

2. The cabinet as claimed in claim 1, wherein the one-way gravity valve includes:

a drain having a first through hole for draining the liquid in the tank through the first through hole when the gravity of the liquid reaches the threshold;

the movable assembly is mounted on the liquid drainage piece and can move relative to the first through hole, so that the movable assembly seals the first through hole when the gravity of the liquid in the box body is smaller than the threshold value, and the first through hole is opened when the gravity of the liquid in the box body reaches the threshold value.

3. The cabinet as claimed in claim 2, further comprising a bottom plate connected to the loading plate to form a water storage chamber, the water storage chamber being in communication with the first through hole to collect the liquid discharged through the first through hole.

4. The cabinet as claimed in claim 1, wherein the first wall further includes a vent hole for communicating the inside and outside of the cabinet; the case further includes a condensing part for shielding the vent hole to condense gas flowing into the inside of the case through the vent hole.

5. The cabinet as claimed in claim 4, wherein the condensing part is provided to an inner surface of the cabinet.

6. The case according to claim 4 or 5, wherein the case further comprises a thermal management member for regulating a temperature of the battery, the thermal management member intersecting the first wall, a first portion of the condensation member extending along the thermal management member to be attached to the thermal management member, and a second portion of the condensation member extending along the first wall to cover the vent hole.

7. The cabinet as claimed in claim 4, wherein the condensing part includes a hood-like structure which shields the vent hole.

8. The cabinet as claimed in claim 7, wherein the hood-like structure is attached to the first wall in a region around the vent hole and has a first opening for gas to flow into the cabinet.

9. The cabinet as claimed in claim 8, wherein the first opening is provided in a first direction of the hood-shaped structure, the first direction being an opposite direction to a direction of gravity.

10. The tank of claim 8 or 9, wherein the first opening is further adapted to collect fluid leaking at a connection of a conduit of a fire protection system when the fluid leaks at the connection.

11. The cabinet as claimed in claim 7, wherein a projection surface of the hood-like structure on the first wall is a U-shaped surface, a V-shaped surface, or a rectangular surface.

12. The cabinet as claimed in claim 7, wherein the condensing part further includes a flow passage for guiding the condensate of the hood-like structure to the one-way gravity valve.

13. The cabinet as claimed in claim 12, wherein portions of the condensing part at both sides of the flow passage are attached to the first wall.

14. The tank of claim 12 or 13, wherein the hood-like structure has a second opening corresponding to the flow channel for directing condensate of the hood-like structure to the flow channel.

15. The cabinet as claimed in claim 14, wherein the second opening is provided in a second direction of the hood-shaped structure, the second direction being a direction of gravity.

16. The tank of claim 12, wherein the one-way gravity valve is further configured to drain condensate within the flow passage out of the tank when the gravity of the condensate within the flow passage reaches the threshold value.

17. The cabinet as claimed in claim 4, wherein the cabinet further comprises:

and the pressure balancing mechanism is used for balancing the pressure inside and outside the box body.

18. The cabinet as claimed in claim 17, wherein the pressure balancing mechanism is provided on the second sub-wall, and gas flowing from outside the cabinet into the cavity through the pressure balancing mechanism flows into inside the cabinet through the vent hole.

19. The tank of claim 1, further comprising a liquid storage member provided on an inner surface of the tank, for collecting the liquid flowing into the liquid storage member when a height of a liquid surface of the liquid in the tank in a gravity direction reaches a height of the liquid storage member, and discharging the liquid flowing into the liquid storage member toward the check gravity valve.

20. A battery comprising a case as claimed in any one of claims 1 to 19, wherein the case is adapted to receive the battery.

21. An electrical device comprising the battery of claim 20, the battery for providing electrical energy.

22. A method of making a battery comprising:

mounting a battery on a carrier plate;

a one-way gravity valve is arranged on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold value; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve;

a first wall connected with the bearing plate is configured to form an accommodating cavity for accommodating the battery, and a liquid discharge hole is formed in the first wall and used for discharging liquid exceeding the height of the liquid discharge hole when the height of the liquid level of the liquid in the box body in the gravity direction is larger than or equal to the height of the liquid discharge hole;

the first wall comprises a first sub-wall and a second sub-wall, a cavity is formed between the first sub-wall and the second sub-wall, the first sub-wall is the inner wall of the box body, the second sub-wall is the outer wall of the box body, and the liquid drainage hole is formed in the first sub-wall, so that the liquid with the height of the liquid level in the gravity direction larger than or equal to that of the liquid drainage hole is collected in the cavity.

23. An apparatus for manufacturing a battery, comprising:

a first means for mounting the battery on the carrier plate;

the second device is used for arranging a one-way gravity valve on the bearing plate;

wherein the one-way gravity valve is configured to close when the gravity of the liquid within the tank is less than a threshold value; and opens when the gravity of the liquid in the tank reaches the threshold value, so that the liquid is discharged through the one-way gravity valve;

the third device is used for configuring a first wall connected with the bearing plate to form an accommodating cavity for accommodating the battery, and a liquid discharge hole is formed in the first wall and used for discharging liquid exceeding the height of the liquid discharge hole when the height of the liquid level of the liquid in the box body in the gravity direction is larger than or equal to the height of the liquid discharge hole;

the first wall comprises a first sub-wall and a second sub-wall, a cavity is formed between the first sub-wall and the second sub-wall, the first sub-wall is the inner wall of the box body, the second sub-wall is the outer wall of the box body, and the liquid drainage hole is formed in the first sub-wall, so that the liquid with the height of the liquid level in the gravity direction larger than or equal to that of the liquid drainage hole is collected in the cavity.

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