Energy storage apparatus

Abstract

An energy storage apparatus, relating to the technical field of energy storage. The energy storage apparatus comprises an enclosure, a plurality of battery packs, a battery rack and a drainage valve. The bottom wall of the battery rack is provided with a first drainage hole, and the drainage valve is disposed at the first drainage hole; the bottom wall of the battery rack defines a drainage boundary, and the clearly defined drainage boundary can effectively improve the drainage performance of the energy storage apparatus and reduce the risk of condensed water accumulating and corroding the batteries and battery rack. Moreover, the drainage valve is designed to close when subjected to the weight of liquid exceeding a preset range; during firefighting of the energy storage apparatus, the amount of firefighting liquid discharged out of the energy storage apparatus can be reduced, allowing the firefighting liquid to accumulate inside the energy storage apparatus, thereby realizing immersion firefighting. In addition, the drainage valve closing when subjected to the weight of liquid below the preset range can reduce the possibility of frequent drainage by the drainage valve when there is a relatively small amount of liquid.

Description

Energy storage device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled "Energy storage device", application number 202411048481.3, filed on August 01, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, and more particularly, to an energy storage device. BACKGROUND

[0004] For the energy storage device, as the number of energy storage units therein is increasing, timely heat dissipation is required during use. If the condensate generated during the heat dissipation process is not discharged in time, it is easy to soak and contaminate the energy storage units. Therefore, how to improve the drainage performance of the energy storage device has become a technical problem to be solved in the field. SUMMARY

[0005] The present application provides an energy storage device which can improve the drainage performance.

[0006] In a first aspect, the embodiments of the present application provide an energy storage device, comprising a box body, a plurality of battery packs, a battery rack and a drainage valve, the box body comprises a bottom wall, the bottom wall is provided with a first liquid discharge hole; the battery rack is located in the box body, and the battery rack is used for carrying the battery packs; the drainage valve is installed in the first liquid discharge hole and is used for discharging the liquid in the box body, and the drainage valve is configured to open when bearing the liquid of a preset range of weight, and to close when bearing the liquid of less than and greater than the preset range of weight.

[0007] By adopting the above technical solution, the first liquid discharge hole is arranged on the bottom wall of the battery rack, and the drainage valve is arranged at the first liquid discharge hole. The condensate in the battery rack can flow to and deposit on the bottom wall under the action of gravity, and is discharged to the outside of the box body by the drainage valve. The bottom wall determines the drainage limit of the battery rack, the drainage limit is clear, and the drainage performance of the energy storage device can be effectively improved, and the risk of condensate accumulation corroding the battery and the battery rack is reduced. Moreover, the drainage valve is designed to close when bearing the liquid of greater than the preset range of weight. When the energy storage device is extinguished, the amount of extinguishing liquid discharged outside the energy storage device can be reduced, and the extinguishing liquid can be accumulated inside the energy storage device to realize immersion extinguishing. In addition, the drainage valve closes when bearing the liquid of less than the preset range of weight, which can reduce the possibility of frequent drainage of the drainage valve when the amount of liquid is small.

[0008] In some embodiments of the present application, the drain valve comprises a valve body, a blocking member and an elastic member, the valve body is installed at the first liquid outlet hole and is provided with a second liquid outlet hole, the blocking member is slidingly connected to the valve body in a first direction, and the elastic member abuts against the valve body and the blocking member respectively, when the drain valve bears the liquid of the preset range weight, the blocking member opens the second liquid outlet hole, when the drain valve bears the liquid of less than and greater than the preset range weight, the blocking member closes the second liquid outlet hole; the first direction is the arrangement direction of the battery rack to the bottom wall.

[0009] By using the above technical solution, the opening and closing of the drain valve is realized by opening and closing the second liquid outlet hole by the blocking member, which is simple in structure and easy to realize.

[0010] In some embodiments of the present application, the blocking member comprises a first blocking part, a rod part and a second blocking part connected in sequence in the first direction, the rod part is inserted into the valve body and can slide relative to the valve body in the first direction, the first blocking part is located at one end of the rod part close to the battery rack, the second blocking part is located at one end of the rod part away from the battery rack, the elastic member is sleeved on the rod part, one end of the elastic member abuts against the valve body and the other end abuts against the first blocking part or the second blocking part; when the drain valve bears the liquid of less than the preset range weight, the first blocking part opens the second liquid outlet hole and the second blocking part blocks the second liquid outlet hole; when the drain valve bears the liquid of the preset range weight, the elastic member deforms, the first blocking part opens the second liquid outlet hole, and the second blocking part moves to form a gap with the second liquid outlet hole to open the second liquid outlet hole; when the drain valve bears the liquid of greater than the preset range weight, the elastic member deforms and the first blocking part moves to block the second liquid outlet hole.

[0011] By using the above technical solution, the blocking member is designed to comprise a first blocking part, a rod part and a second blocking part, when the valve body bears the liquid of less than the preset range weight, the second blocking part blocks the second liquid outlet hole, at this time, the liquid is accumulated to the second blocking part through the second liquid outlet hole, when the liquid continuously increases and the weight of the liquid reaches the preset range weight, the elastic member deforms, the first blocking part and the second blocking part are opened, so as to open the second liquid outlet hole, when the valve body bears the liquid pressure of greater than the preset range weight, the elastic member continues to deform and makes the first blocking part block the second liquid outlet hole, the switching of the drain valve among the three states is realized by using the deformation of the elastic member, which is simple and ingenious in structure.

[0012] In some embodiments of the present application, the drain valve further comprises a first sealing member connected to one end of the first blocking part facing the second liquid outlet hole, when the drain valve bears liquid with a weight greater than the preset range, the first sealing member abuts and sealingly cooperates with the valve body and surrounds the second liquid outlet hole, the first sealing member and the first blocking part jointly close the second liquid outlet hole; and / or the drain valve further comprises a second sealing member connected to one end of the second blocking part facing the second liquid outlet hole, when the drain valve bears liquid with a weight less than the preset range, the second sealing member abuts and sealingly cooperates with the valve body and surrounds the second liquid outlet hole, the second sealing member and the second blocking part close the second liquid outlet hole.

[0013] With the above technical solution, when the first blocking part closes the second liquid outlet hole, the cooperation between the first sealing member and the valve body can improve the sealing performance of the first blocking part and the valve body, thereby reducing the possibility of liquid flowing from the gap between the first blocking part and the valve body into the second liquid outlet hole. Similarly, when the second blocking part closes the second liquid outlet hole, the cooperation between the second sealing member and the valve body can improve the sealing performance of the second blocking part and the valve body, thereby reducing the possibility of liquid flowing from the gap between the second blocking part and the valve body into the second liquid outlet hole.

[0014] In some embodiments of the present application, the valve body comprises a valve plate and a valve wall connected around the valve plate, the valve wall is installed on the first liquid outlet hole, the valve plate is provided with the second liquid outlet hole, the valve plate is located between the first blocking part and the second blocking part, the rod part is inserted into the valve plate, the valve wall and the valve plate surround a first valve cavity, and the first blocking part is located in the first valve cavity.

[0015] With the above technical solution, when the amount of liquid is less than the preset range, the liquid flows from the first surface into the first valve cavity below and is deposited on the second blocking part through the second liquid outlet hole on the valve plate, when the amount of liquid deposited in the first valve cavity reaches the preset range, the second blocking part opens the second liquid outlet hole for drainage, and when the amount of liquid is greater than the preset range, the elastic member is compressed and drives the first blocking part to close the second liquid outlet hole, that is, the first valve cavity can limit the liquid borne by the valve body, thereby facilitating the opening and closing control of the drain valve.

[0016] In some embodiments of the present application, the first blocking part comprises a cover body and a sealing part, one end of the cover body away from the second liquid outlet hole is sealingly connected with the rod part, the radial dimension of the cover body gradually increases from the one end of the cover body away from the second liquid outlet hole to the one end of the cover body facing the second liquid outlet hole, and the sealing part is connected to the one end of the cover body facing the second liquid outlet hole and is used to close the second liquid outlet hole.

[0017] According to the technical scheme, when the first blocking part abuts against the valve body, the cover body and the sealing part can cover the second liquid outlet hole on the valve body, so that the second liquid outlet hole is closed, and the outer wall of the cover body can facilitate the falling of liquid, thereby improving the drainage efficiency.

[0018] In some embodiments of the present application, the preset range weight is 1g-1000g.

[0019] According to the technical scheme, the preset range weight is set to 1g-1000g, which conforms to the deposition amount of condensate water in most cases, and improves the rationality of the preset range weight.

[0020] In some embodiments of the present application, the drainage rate of the drainage valve is x kg / 24h, and x is a numerical value less than or equal to 30.

[0021] According to the technical scheme, the drainage rate is designed as x kg / 24h, which can meet the drainage requirements of condensate water.

[0022] In some embodiments of the present application, the energy storage device stores an electric quantity of y MWh, y is a numerical value less than or equal to 20, and the ratio of x / y is in the interval of 0.01 to 30.

[0023] According to the technical scheme, it is considered that the larger the electric quantity is, the larger the battery volume is, and the smaller the space for air condensation in the battery rack is, and the amount of condensate water is also smaller, so the ratio of the drainage rate to the electric quantity is designed as 0.01-30, so that the drainage rate of the drainage valve is close to the generation rate of condensate water in the battery rack.

[0024] In some embodiments of the present application, the energy storage device stores an electric quantity of y MWh, y is a numerical value less than or equal to 20, and the number of the drainage valves is z, and the ratio of y / z is in the interval of 0.05 to 20.

[0025] According to the technical scheme, it is considered that the larger the electric quantity is, the larger the battery volume is, and the smaller the space for air condensation in the battery rack is, and the amount of condensate water is also smaller, so the ratio of the number of the drainage valves to the electric quantity is designed as 0.05-20, so that the number of the drainage valves is close to the amount of condensate water that needs to be drained.

[0026] In some embodiments of the present application, the bottom wall comprises opposite first and second surfaces, the first surface is used to mount the battery rack, the first liquid outlet hole penetrates the first and second surfaces, the bottom wall is provided with a groove recessed away from the battery rack at the first surface, and the first liquid outlet hole is arranged in the groove.

[0027] The technical scheme is adopted, the groove is arranged on the first surface, and the condensed water on the first surface flows downward to the groove, so that the condensed water is discharged from the bottom end of the groove and the drain valve, and meanwhile, the groove can jointly define the liquid borne by the valve body with the first valve cavity.

[0028] In some embodiments of the present application, the size of the groove gradually decreases along a second direction from the first surface to the second surface, and the second direction is any direction intersecting the arrangement direction from the first surface to the second surface.

[0029] The technical scheme is adopted, the groove forms a structure in which the space gradually decreases from top to bottom, and thus the condensed water is more easily discharged to the drain valve.

[0030] In some embodiments of the present application, the box body comprises a first side wall and a second side wall connected to the bottom wall, the first side wall is provided with a door body, the battery rack is located between the first side wall and the second side wall, the groove is located between the first side wall and the second side wall and is arranged close to the first side wall, and the first liquid discharge hole is arranged close to the first side wall and deviates from the center position of the opening of the groove.

[0031] The technical scheme is adopted, the structure is arranged to be eccentric, and the drain valve is arranged close to the first side wall, so that the installation and subsequent maintenance of the drain valve are facilitated.

[0032] In some embodiments of the present application, the maximum distance between the first liquid discharge hole facing one end of the battery rack and the first surface is H1, the axial size of the first liquid discharge hole is H2, H1 / H2=0.08-0.3, and the first direction is the arrangement direction from the battery rack to the bottom wall.

[0033] The technical scheme is adopted, the first surface and the first liquid discharge hole have a certain height difference, and the first liquid discharge hole has a certain size to install the drain valve.

[0034] In some embodiments of the present application, along the first direction, the size of the box body is H3, and H2 / H3=0.01-0.05.

[0035] The numerical range of H1 / H2 is designed to be 0.08-0.3, and the numerical range of H2 / H3 is designed to be 0.01-0.05, the depth of the groove and the size of the first liquid discharge hole are limited by the height of the energy storage device, and the inner wall surface of the groove at this depth is designed to have a reasonable inclination.

[0036] In some embodiments of the present application, the bottom wall comprises opposite first and second surfaces, the first surface is used to mount the battery holder, the first row of liquid holes penetrates the first and second surfaces, the first and / or second surface is coated with a waterproof coating, and / or the first and / or second surface is mounted with a moisture absorbing member.

[0037] With the above technical solution, the waterproof coating can reduce the possibility of condensate water remaining on the bottom wall and reduce corrosion of the bottom wall. In addition, the moisture absorbing member can absorb part of the condensate water, and the condensate water is discharged after reaching a certain amount, reducing the possibility of affecting the service life of the drain valve due to frequent opening. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0039] FIG. 1 is a structural schematic diagram of the energy storage device provided by some embodiments of the present application in a first perspective view;

[0040] FIG. 2 is a structural schematic diagram of the energy storage device provided by some embodiments of the present application in a second perspective view;

[0041] FIG. 3 is a partial structural schematic diagram of the energy storage device provided by some embodiments of the present application;

[0042] FIG. 4 is a partial structural schematic diagram of the energy storage device provided by some embodiments of the present application;

[0043] FIG. 5 is a sectional view of the box of the energy storage device provided by some embodiments of the present application;

[0044] FIG. 6 is an enlarged view of part a of FIG. 5;

[0045] FIG. 7 is a structural schematic diagram of the drain valve of the box of the energy storage device provided by some embodiments of the present application when the weight of the liquid is less than the preset range weight and the drain valve is closed;

[0046] FIG. 8 is a structural schematic diagram of the drain valve of the box of the energy storage device provided by some embodiments of the present application when the drain valve is opened;

[0047] FIG. 9 is a structural schematic diagram of the drain valve of the box of the energy storage device provided by some embodiments of the present application when the weight of the liquid is greater than the preset range weight and the drain valve is closed.

[0048] The reference signs of the specific embodiments are as follows: 100, energy storage device; 10, box body; 11, bottom wall; 111, first surface; 1111, groove; 112, second surface; 113, first drainage hole; 12, top wall; 13, first side wall; 131, door body; 14, second side wall; 15, bottom cross beam; 16, side cross beam; 20, battery rack; 30, drain valve; 31, valve body; 311, second drainage hole; 312, valve plate; 313, valve wall; 314, first valve cavity; 32, plugging piece; 321, first plugging part; 3211, cover body; 3212, sealing part; 322, rod part; 323, second plugging part; 33, elastic piece; 34, first sealing piece; 35, second sealing piece; 40, moisture absorbing piece; 200, battery pack; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the 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 the non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0051] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] The term "and / or" in the present application only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0054] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0055] "Multiple" appearing in the present application means two or more (including two).

[0056] At present, the application of power batteries is more and more extensive. Power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0057] The energy storage device integrates the power battery in the container, realizes the rapid integration and rapid use of the battery, and the energy storage device usually includes a box body and an air conditioning device mounted on the box body. The box body is provided with a battery rack, and the battery rack is provided with a plurality of battery racks for mounting and fixing batteries. The air conditioning device is used for cooling the batteries in the battery rack.

[0058] During the cooling process of the air conditioning device, a certain amount of condensate water is generated in the battery rack, which causes the risk of water immersion of the bottom of the box body and the batteries and the battery rack located at the bottom of the box body. Although there is a drainage structure in the related art, the drainage boundary is not clear, and the drainage effect needs to be improved.

[0059] Therefore, how to improve the drainage performance of the energy storage device is an important topic in the research and development of the energy storage device.

[0060] In view of this, the application provides a technical solution which improves the drainage performance of the energy storage device by opening a first drainage hole in the bottom wall of the box and configuring a drain valve on the bottom wall.

[0061] The energy storage device provided in the embodiment will be described below in conjunction with FIGS. 1-9.

[0062] In conjunction with FIGS. 1-5, the application provides an energy storage device 100, which includes a box 10, a battery rack 20, and a drain valve 30. The box 10 includes a bottom wall 11 provided with a first drainage hole 113. The battery rack 20 is located in the box 10 and is used to carry a battery pack 200. The drain valve 30 is installed in the first drainage hole 113 and is used to drain the liquid on the first surface 111. The liquid can be condensed water. The drain valve 30 is configured to open when it bears the liquid with a weight in a preset range and to close when it bears the liquid with a weight less than or greater than the preset range.

[0063] The box 10 includes a top wall 12, a bottom wall 11, and a plurality of side walls connected between the top wall 12 and the bottom wall 11. It can be understood that the "top" and "bottom" in the top wall 12 and the bottom wall in the embodiment refer to the spatial position of the energy storage device 100 when the battery pack 200 is stored. During the assembly, transportation, and other processes of the energy storage device 100, the bottom wall 11 can be located above the top wall 12.

[0064] The box 10 is provided below the bottom wall 11 with a bottom crossbeam 15 supporting the bottom wall 11. The number of bottom walls 11 can be one or more. When the number of bottom walls 11 is more than one, the adjacent two bottom walls 11 can be connected by a side crossbeam 16.

[0065] The bottom wall 11 is provided with a first drainage hole 113. The number of first drainage holes 113 on each bottom wall 11 can be one or more, which is shown as an example in the figure.

[0066] The battery rack 20 is located in the box 10. It can be understood that the battery rack 20 in the embodiment can be multiple. The multiple battery racks 20 are arranged along a second direction Y. The second direction Y can be the length direction of the box 10. The bottom of the battery rack 20 is supported by the bottom wall 11. The battery pack 200 can be a battery module or a battery pack. The battery pack 200 can include one or more battery monomers. The battery monomer can be a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer, or a magnesium ion battery monomer, etc. The embodiment does not enumerate them one by one.

[0067] The air conditioner (not shown in the figure) is installed on one side of the box 10 along the second direction Y, and is used to cool the battery rack 20. The condensed water generated during cooling can be collected on the bottom wall 11, and then discharged to the bottom wall 11 of the box 10 by the drain valve 30. The drainage boundary is the bottom wall 11, and the condensed water is finally discharged from the first drain hole 113 on the bottom wall 11 and the drain valve 30. The drainage performance of the energy storage device 100 can be effectively improved, and the risk of condensed water accumulation corroding the battery rack 20 and the battery pack 200 is reduced.

[0068] The drain valve 30 of the embodiment can only be opened when the liquid is in a preset range of weight, which is greater than 0g. The specific optional range is given below.

[0069] There are many implementations of such a drain valve 30. For example, the drain valve 30 is a solenoid valve (not shown in the figure), and a weight detection structure (such as a weight force sensor) can be provided in the bottom wall 11 or the solenoid valve. When the liquid deposited on the bottom wall 11 or in the solenoid valve is in a preset range of weight, the solenoid valve is opened. For another example, a float drain valve 30 (not shown in the figure) can be used to achieve this. When the weight of the liquid reaches a preset value, the float will rise and trigger the drain valve 30 to open, thereby allowing water to flow out. Once the liquid is less than the preset range of weight, the float will drop and close the drain valve 30.

[0070] In combination with FIGS. 7-9, in some examples, the blocking piece 32 includes a first blocking part 321, a rod part 322 and a second blocking part 323 connected in sequence along the first direction X. The rod part 322 is inserted into the valve body 31 and can slide relative to the valve body 31 along the first direction X. The first blocking part 321 is located at one end of the rod part 322 close to the battery rack 20, and the second blocking part 323 is located at one end of the rod part 322 away from the battery rack 20. The elastic piece 33 is sleeved on the rod part 322, one end of the elastic piece 33 abuts against the valve body 31, and the other end abuts against the first blocking part 321 or the second blocking part 323. When the drain valve 30 bears a liquid less than the preset range of weight, the first blocking part 321 opens the second drain hole 311, and the second blocking part 323 blocks the second drain hole 311. When the drain valve 30 bears a liquid in the preset range of weight, the elastic piece 33 deforms, the first blocking part 321 opens the second drain hole 311, and the second blocking part 323 moves to form a gap with the second drain hole 311 to open the second drain hole 311. When the drain valve 30 bears a liquid greater than the preset range of weight, the elastic piece 33 deforms, and the first blocking part 321 moves to block the second drain hole 311.

[0071] When the valve body 31 bears liquid with weight less than the preset range, the liquid gravity is less than the force that the elastic member 33 generates deformation, at this time, the liquid is accumulated to the second sealing part 323 through the second liquid discharge hole 311, when the liquid continuously increases and the liquid weight reaches the preset range, the elastic member 33 generates deformation, the second sealing part 323 is opened, when the valve body 31 bears liquid pressure greater than the preset range, the elastic member 33 continuously generates deformation and makes the first sealing part 321 seal the second liquid discharge hole 311, the structure is simple and ingenious.

[0072] As shown in FIG. 7, when the liquid quantity is less than the preset range, the elastic member 33 does not generate deformation or only generates slight deformation, at this time, the sealing member 32 closes the second liquid discharge hole 311, as shown in FIG. 8, when the liquid quantity is in the preset range, the drainage valve 30 realizes the opening of the second liquid discharge hole 311 through the movement of the sealing member 32 to drive the deformation of the elastic member 33, the structure is simple and easy to realize. As shown in FIG. 9, when the liquid quantity exceeds the preset range, the sealing member 32 continuously moves downward to close the second liquid discharge hole 311.

[0073] It should be noted that the "abutting" in the embodiment includes the abutting mode of two components abutting against each other, and also includes the connecting mode that one of the two components can drive the movement of the other component when the one component moves. In addition, the "closing" of the second liquid discharge hole 311 in the embodiment means that the second liquid discharge hole 311 is not communicated with the inside of the tank 10, and the "opening" of the second liquid discharge hole 311 means that the second liquid discharge hole 311 is communicated with the tank 10.

[0074] The valve body 31 is located in the first liquid discharge hole 113, so that the liquid flowing into the first liquid discharge hole 113 directly enters the valve body 31 and can be discharged out of the tank 10 through the second liquid discharge hole 311 of the valve body 31, the number of the second liquid discharge hole 311 can be one or more, and the structure of the valve body 31 is given below.

[0075] The material of the sealing member 32 can be metal or plastic, the overall shape of the first sealing part 321 can be approximately disc-shaped or conical, thereby forming the cross-sectional shape as shown in FIGS. 7-9, and the shape of the second sealing part 323 can be disc-shaped.

[0076] The embodiment adopts the elastic member 33 to realize the automatic opening and closing of the valve body 31, the elastic member 33 can be a spring, the elastic member 33 can abut against the valve plate and the first sealing part 321 of the valve body 31 as shown in FIGS. 7-9, the elastic member 33 can also abut against the valve plate 312 and the second sealing part 323 of the valve body 31 (not shown in the figure), the drainage valve 30 realizes the automatic opening and closing of the drainage valve 30 through a pure mechanical structure, the structure is simple and ingenious.

[0077] In some examples, the drain valve 30 further comprises a first sealing member 34 connected to one end of the first blocking part 321 facing the second liquid outlet hole 311, and when the drain valve 30 bears liquid with a weight greater than a preset range, the first sealing member 34 is in sealing cooperation with the valve body 31 to close the second liquid outlet hole 311; and / or the drain valve 30 further comprises a second sealing member 35 connected to one end of the second blocking part 323 facing the second liquid outlet hole 311, and when the drain valve 30 bears liquid with a weight less than the preset range, the second sealing member 35 is in sealing cooperation with the valve body 31 to close the second liquid outlet hole 311.

[0078] In order to improve the sealing performance of the first blocking part 321, a first sealing member 34 can be installed on the side of the first blocking part 321 facing the valve plate 312, and the first sealing member 34 can be a sealing ring made of rubber, silicone or the like.

[0079] Similarly, a second sealing member 35 can be installed on the side of the second blocking part 323 facing the valve plate 312, and the second sealing member 35 can be a sealing ring made of rubber, silicone or the like, and the second sealing member 35 is in a constant sealing state with the valve plate 312, so that the liquid discharged from the second liquid outlet hole 311 is blocked by the second blocking part 323 and cannot fall to the bottom wall 11. When the liquid drives the second blocking part 323 to move away from the bottom wall 11, the second sealing member 35 and the bottom wall 11 are unsealed, so that the liquid can be discharged through the second liquid outlet hole 311 to the bottom wall 11.

[0080] When the first blocking part 321 closes the second liquid outlet hole 311, the cooperation between the first sealing member 34 and the valve body 31 can improve the sealing performance of the first blocking part 321 and the valve body 31, thereby reducing the possibility of liquid flowing from the gap between the first blocking part 321 and the valve body 31 into the second liquid outlet hole 311. Similarly, when the second blocking part 323 closes the second liquid outlet hole 311, the cooperation between the second sealing member 35 and the valve body 31 can improve the sealing performance of the second blocking part 323 and the valve body 31, thereby reducing the possibility of liquid flowing from the gap between the second blocking part 323 and the valve body 31 into the second liquid outlet hole 311.

[0081] As shown in FIG. 7, when the weight of the condensate water is less than the preset range, the elastic member 33 is not deformed or slightly deformed, and the second blocking part 323 and the second sealing member 35 form a one-way sealing cavity to close the second liquid outlet hole 311, so as to block the liquid from falling through the second liquid outlet hole 311. As shown in FIG. 8, when the weight of the liquid reaches the preset range, the elastic member 33 is compressed, and the second blocking part 323 and the second sealing member 35 move away from the bottom wall 11, so that the second blocking part 323 and the second sealing member 35 open the second liquid outlet hole 311, and the first sealing member 34 and the second sealing member 35 are spaced apart from the second liquid outlet hole 311, so that the water can be drained. As shown in FIG. 9, when the weight of the condensate water is greater than the preset range, the elastic member 33 is continuously compressed, so that the first sealing member 34 and the first blocking part 321 close the second liquid outlet hole 311. When the liquid is drained, the elastic member 33 drives the first blocking part 321 and the second blocking part 323 to return to the state shown in FIG. 7.

[0082] When the elastic member 33 is connected to the valve plate 312 and the second blocking part 323 of the valve body 31, the elastic member 33 is only slightly stretched or not deformed when the weight of the liquid is less than the preset range, so as to offset the gravity of the blocking member 32, so that the blocking member 32 remains stationary. When the weight of the liquid reaches the preset range, the elastic member 33 is stretched, so that the second blocking part 323 is spaced apart from the valve body 31, so as to open the second liquid outlet hole 311. When the weight of the liquid is greater than the preset range, the elastic member 33 is continuously stretched, so that the first blocking part 321 closes the second liquid outlet hole 311.

[0083] In some examples, the valve body 31 includes the valve plate 312 and the valve wall 313 connected to the periphery of the valve plate 312. The valve wall 313 is installed in the first liquid outlet hole 113, the valve plate 312 is provided with the second liquid outlet hole 311, the valve plate 312 is located between the first blocking part 321 and the second blocking part 323, the valve wall 313 and the valve plate 312 form the first valve cavity 314, the rod part 322 is inserted into the valve plate 312, and the first blocking part 321 is located in the first valve cavity 314.

[0084] The valve plate 312 and the valve wall 313 are located in the first liquid outlet hole 113. The valve plate 312 can be circular or rectangular. The valve wall 313 surrounds the valve plate 312. The top end of the valve wall 313 is connected to the upper end of the first liquid outlet hole 113, and the lower part of the valve wall 313 is connected to the valve plate 312. The valve wall 313 and the valve plate 312 form the first valve cavity 314. The bottom end of the valve wall 313 can be arranged below the valve plate 312, so as to form a second valve cavity for accommodating the second blocking part 323.

[0085] When the liquid amount is less than the preset range weight, the liquid flows from the first surface 111 of the bottom wall 11 into the first valve cavity 314 below, and is deposited onto the second sealing part 323 through the second liquid discharge hole 311 on the valve plate 312. When the liquid amount deposited in the first valve cavity 314 reaches the preset range weight, the elastic member 33 is compressed, the second sealing part 323 opens the second liquid discharge hole 311 to drain water, and when the liquid amount is greater than the preset range weight, the elastic member 33 is continuously compressed, and the first sealing part 321 closes the second liquid discharge hole 311, that is, the first valve cavity 314 can limit the liquid that the valve body 31 can bear, thereby facilitating the opening and closing of the drain valve 30.

[0086] In some examples, optionally, the first sealing part 321 includes a cover body 3211 and a sealing part 3212. The cover body 3211 is sealingly connected to the rod part 322 at an end thereof away from the second liquid discharge hole 311. The radial dimension of the cover body 3211 gradually increases from the end thereof away from the second liquid discharge hole 311 to an end thereof facing the second liquid discharge hole 311. The sealing part 3212 is connected to the end of the cover body 3211 facing the second liquid discharge hole 311 and is used to close the second liquid discharge hole 311.

[0087] The sealing connection of the cover body 3211 to the rod part 322 can be that the rod part 322 is inserted into the cover body 3211 and then sealingly connected to the cover body 3211 by welding, bonding or the like, or that the cover body 3211 is directly integrally connected to the rod part 322 by welding, hot melting or the like, or that the cover body 3211 and the rod part 322 are integrally formed during machining.

[0088] The cover body 3211 is in the shape of a tapered cylinder, and the outer wall surface of the cover body 3211 forms an inclined surface, which can facilitate the falling of the liquid and improve the drainage efficiency.

[0089] The sealing part 3212 can be in the shape of a ring, and the sealing part 3212 is used to sealingly cooperate with the valve plate 312 of the valve body 31. The sealing part 3212 and the cover body 3211 form a sealing cavity to block the liquid from entering the second liquid discharge hole 311, thereby closing the second liquid discharge hole 311.

[0090] In some examples, optionally, the preset range weight is 1g-1000g.

[0091] Setting the preset range weight to be 1g-1000g conforms to the deposition amount of the condensed water in most cases, and improves the rationality of the preset range weight. For example, the preset range weight can be 1g, 10g, 50g, 100g, 200g, 500g or 1000g, etc.

[0092] In some examples, optionally, the drain rate of the drain valve 30 is x kg / 24h, x is a numerical value, and is less than or equal to 30.

[0093] The drainage rate of the drain valve 30 is determined by the following steps: first, prepare a measuring bucket or container, a timer, a measuring scale or ruler. Make the drain valve 30 in normal working condition, no blockage or other problems. When the drain valve 30 bears a predetermined weight (for example, 1-1000g) of liquid, the drain valve is in an open state, and the time and the amount of the drained liquid are recorded. Record the amount of the drained liquid every certain time (such as every 10 seconds) until the drain valve 30 is completely closed or a predetermined time or amount is reached. Record the time and the corresponding amount of the drained liquid (in kg) of each measurement. Calculate the drainage rate according to the recorded time and the amount of the drained liquid. For example, divide the amount of the drained liquid by the time unit (seconds, minutes or hours) to get the drainage rate. Verify the accuracy of each measurement to achieve consistency of the drainage rate under different conditions. According to the need, the test can be repeated multiple times to improve the accuracy and reliability of the data.

[0094] The drainage rate x is designed to be less than or equal to 30 kg / 24h, and in some embodiments, x can be 1-30, which can meet the drainage requirements of the condensed water in the battery rack 20 and quickly drain the condensed water outside the battery rack 20.

[0095] Further, x can be designed to be less than or equal to 10, and further x can be designed to be less than or equal to 6, for example, it can be 1, 2, 3, 4, 5 and 6, etc. The above design is to consider that the larger the drainage rate is, the higher the cost of the drain valve 30 is. Therefore, when x is less than or equal to 10 or even less than or equal to 6, the economy can be considered while meeting the drainage requirements.

[0096] In some examples, the energy storage device 100 stores an amount of electricity y MWh, y is a numerical value and is less than or equal to 20, and the ratio of x / y is in the interval of 0.01-30.

[0097] The amount of electricity stored by the energy storage device 100 can be the sum of the amounts of electricity stored by the plurality of battery packs 200 in the battery rack 20, and y can be obtained from the nameplate of the energy storage device. Considering that the larger the amount of electricity stored by the energy storage device 100 is, the larger the volume of the battery pack 200 is, and the smaller the space available for air condensation in the battery rack 20 is, the amount of condensed water is also smaller, therefore, the ratio of the drainage rate to the amount of electricity is designed to be 0.01-30, so that the drainage rate of the drain valve 30 is close to the generation rate of the condensed water in the battery rack 20.

[0098] Further, the ratio of x / y is in the interval of 0.1-10, and further the ratio of x / y is in the interval of 0.015-5, so that the drainage rate is close to the generation rate of the condensed water.

[0099] In some examples, optionally, the amount of electricity stored by the energy storage device 100 is y MWh, y is a numerical value, and is less than or equal to 20, the number of the drain valves 30 is z, and the ratio of y / z is in the interval of 0.05 to 20.

[0100] Similarly, the setting of the ratio range of the number of the drain valves 30 and the amount of electricity stored by the battery rack 20 is also made considering that the larger the amount of electricity is, the larger the battery pack 200 is, and the smaller the space for air condensation in the battery rack 20 is, and the less the amount of condensed water is, so the ratio of the number of the drain valves 30 to the amount of electricity is designed to be 0.05-20, for example, it can be 0.05, 0.1, 1, 5, 10, and 20, so that the number of the drain valves 30 is close to the amount of condensed water that needs to be drained.

[0101] The number of the drain valves 30 can be 1-10, for example, as shown in FIG. 4, the number of the drain valves 30 can be designed to be 5, at this time, the number of the bottom walls 11 is also five, and the side beams 16 are arranged between the adjacent two bottom walls 11, that is, the drain valves 30 are arranged on each bottom wall 11, at this time, the number of the first drain holes 113 can be equal to the number of the drain valves 30.

[0102] Further, the ratio of y / z can be in the interval of 0.1 to 10, and further, the ratio of y / z can be 0.3 to 6, to optimize the number of the drain valves 30.

[0103] In combination with FIG. 6, in some examples, optionally, the bottom wall 11 includes opposite first and second surfaces 111 and 112, the first surface 111 is used to mount the battery rack 20, the first drain hole 113 penetrates the first and second surfaces 111 and 112, and the bottom wall 11 is provided with a groove 1111 recessed away from the bottom of the battery rack 20 at the first surface 111, and the first drain hole 113 is arranged in the groove 1111.

[0104] The condensed water on the bottom wall 11 flows downward to the groove 1111, so as to be drained from the second drain valve 30 below the groove 1111, and at the same time, the groove 1111 and the first valve cavity 314 can jointly form a water storage chamber, and both of them jointly define the liquid borne by the valve body 31.

[0105] In some examples, optionally, the size of the groove 1111 along the second direction Y gradually decreases from the first surface 111 to the second surface 112, and the second direction Y is any direction intersecting the arrangement direction of the first and second surfaces 111 and 112.

[0106] The second direction Y can be one of the length direction and the width direction of the box 10, and the size of the groove 1111 in a third direction Z perpendicular to the second direction Y can also be designed to gradually decrease from the second surface 112 to the bottom wall 11, the third direction Z being the other one of the length direction and the width direction of the box 10, so that the above structure can be understood as that the cross-sectional length of the groove 1111 gradually decreases from top to bottom, or the cross-sectional width of the groove 1111 gradually decreases, or both the cross-sectional length and the cross-sectional width of the groove 1111 gradually decrease.

[0107] Such a structure design can make the space formed by the groove 1111 gradually smaller from top to bottom or in a funnel-shaped structure, thereby facilitating the flow of condensed water to the drain valve 30.

[0108] Again in combination with FIGS. 1, 3 and 4, in some examples, the box 10 includes a first side wall 13 and a second side wall 14 connected to the bottom wall 11, the first side wall 13 is provided with a door body 131, the battery rack 20 is located between the first side wall 13 and the second side wall 14, the groove 1111 is located between the first side wall 13 and the second side wall 14 and is arranged close to the first side wall 13, and the first liquid discharge hole 113 is arranged in a direction close to the first side wall 13 and deviates from the center position of the opening of the groove 1111.

[0109] The plurality of side walls of the box 10 described above include the first side wall 13 and the second side wall 14, the first side wall 13 is one side wall that can be seen in FIG. 1, and the second side wall 14 is the side wall behind the battery rack 20 in FIG. 3, the first side wall 13 and the second side wall 14 are both located between the top wall 12 and the bottom wall 11, the first side wall 13 and the second side wall 14 are oppositely arranged in the third direction Z, and the first side wall 13 can be provided with an openable door body 131.

[0110] The first liquid discharge hole 113 is arranged as an eccentric structure, "eccentric" means that the first liquid discharge hole 113 deviates from the center position of the bottom wall of the groove 1111, and the first liquid discharge hole 113 and the drain valve 30 are designed to be arranged closer to the first side wall 13, so that after the door body 131 of the first side wall 13 is opened, the installation and subsequent maintenance of the drain valve 30 are facilitated.

[0111] In combination with FIG. 7, in some examples, along the first direction X, the distance from the end of the first liquid discharge hole 113 facing the battery rack 20 to the first surface 111 is H1, the axial size of the first liquid discharge hole is H2, and the ratio of H1 / H2 is in the interval 0.08 to 0.3, and the first direction is the arrangement direction of the first surface 111 to the second surface 112.

[0112] H1 / H2 can be 0.08, 0.1, 0.15, 0.2, 0.3, etc., which will not be listed one by one in this embodiment. Further, the ratio of H1 / H2 can also be 0.11 to 0.25, and further, 0.13 to 0.18.

[0113] The above structural design not only makes the first surface 111 and the first drain hole 113 have a certain drainage height, but also facilitates the installation of the drain valve 30 in the first drain hole 113.

[0114] In combination with FIGS. 3 and 7, in some examples, the size of the box 10 along the first direction X is H3, and the ratio of H2 / H3 is in the interval 0.01 to 0.05.

[0115] The size H3 of the box 10 along the first direction X can be understood as the height of the box 10, and H3 can be 1m-20m, and H2 / H3 can be 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0116] Further, H2 / H3 can also be 0.015 to 0.035, and further, 0.02 to 0.03.

[0117] Designing the numerical range of H1 / H2 to be 0.08-0.3 and the numerical range of H2 / H3 to be 0.01-0.05 can limit the axial size of the first drain hole to be H 2， Thus, the distance between the end of the first drain hole 113 facing the battery rack 20 and the first surface 111 is H1, and the depth of the groove 1111 can be limited, and the groove 1111 at this depth facilitates the design of its inner wall surface to have a reasonable inclination.

[0118] In some examples, the bottom wall 11 includes opposite first and second surfaces 111 and 112, the first surface 111 is used to mount the battery rack 20, the first drain hole 113 penetrates the first and second surfaces 111 and 112, and the first and / or second surfaces 111 and 112 are coated with a waterproof coating, and / or the first and / or second surfaces 111 and 112 are mounted with a moisture absorbing member 40.

[0119] The waterproof coating (not shown in the figure) is provided in three embodiments, one of which is to coat the first surface 111 with a waterproof coating, another is to coat the second surface 112 with a waterproof coating, and the third is to coat both the first and second surfaces 111 and 112 with a waterproof coating. Since the thickness of the waterproof coating is relatively thin, this embodiment is not shown in the drawings and the reference signs.

[0120] The waterproof coating can include at least one of a polymer coating (e.g., an acrylic coating, a polyurethane coating), a rubber coating, a silicone coating, and an asphalt coating, and other waterproof materials that can be coated on the plate can also be used as the waterproof coating material of the present embodiment.

[0121] By providing the waterproof coating, the possibility of condensate water remaining on the bottom wall 11 can be reduced, and thus the corrosion of the bottom wall 11 by the condensate water can be reduced.

[0122] The moisture absorbing member can be provided in three embodiments, one of which is to install the moisture absorbing member 40 on the first surface 111, another is to install the moisture absorbing member 40 on the second surface 112, and the other is to install the moisture absorbing member 40 on both the first surface 111 and the second surface 112.

[0123] The area of the moisture absorbing member 40 is smaller than the area of the bottom wall 11, and when the number of the bottom walls 11 is plural, at least one moisture absorbing member 40 is installed on each bottom wall 11. The moisture absorbing member 40 can be a sheet-shaped water absorbing sheet, and the material thereof can be a sponge or a water absorbing resin, etc.

[0124] When a small amount of condensate water is generated in the battery holder 20, a part of the condensate water can be absorbed by the moisture absorbing member 40, and after the condensate water accumulates to a certain amount, it is discharged, reducing the possibility of the drain valve 30 being frequently opened and affecting the service life.

[0125] Finally, please refer to the drawings 1-9 shown, the application embodiment provides a kind of energy storage equipment 100, including box 10, multiple battery packs 200, battery rack 20 and drain valve 30, box 10 includes bottom wall 11, bottom wall 11 is provided with first liquid discharge hole 113;Battery rack 20 is located in box 10, battery rack 20 is used to carry battery pack 200;Drain valve 30 is installed in first liquid discharge hole 113, and is used to discharge liquid in box 10, drain valve 30 is configured as opening when being subjected to the liquid of preset range weight, and closing when being subjected to the liquid less than and greater than preset range weight.Drain valve 30 includes valve body 31, plugging piece 32 and elastic piece 33, valve body 31 is installed in first liquid discharge hole 113, and is equipped with second liquid discharge hole 311, plugging piece 32 is slidably connected in valve body 31 along first direction X, elastic piece 33 is respectively in abutment with valve body 31 and plugging piece 32, drain valve 30 is subjected to the liquid of preset range weight, plugging piece 32 opens second liquid discharge hole 311, drain valve 30 is subjected to the liquid less than and greater than preset range weight, plugging piece 32 closes second liquid discharge hole 311;First direction X is the arrangement direction of battery rack 20 to bottom wall 11.Plugging piece 32 includes first blocking part 321, stem portion 322 and second blocking part 323 connected in first direction X in proper order, stem portion 322 is inserted in valve body 31, and can be slid along first direction X relative to valve body 31, first blocking part 321 is located in stem portion 322 one end close to battery rack 20, second blocking part 323 is located in stem portion 322 one end away from battery rack 20, elastic piece 33 is sleeved on stem portion 322, one end of elastic piece 33 is in abutment with valve body 31, and the other end is in abutment with first blocking part 321 or second blocking part 323;Wherein, drain valve 30 is subjected to the liquid less than preset range weight, first blocking part 321 opens second liquid discharge hole 311, and second blocking part 323 blocks second liquid discharge hole 311;Drain valve 30 is subjected to the liquid of preset range weight, elastic piece 33 is deformed, first blocking part 321 opens second liquid discharge hole 311, and second blocking part 323 moves to form interval with second liquid discharge hole 311, to open second liquid discharge hole 311;Drain valve 30 is subjected to the liquid greater than preset range weight, elastic piece 33 is deformed, and first blocking part 321 moves to block second liquid discharge hole 311.The drain valve 30 further comprises a first sealing member 34 connected to one end of the first blocking part 321 facing the second liquid outlet hole 311, when the drain valve 30 bears liquid with a weight greater than a preset range, the first sealing member 34 is in sealing cooperation with the valve body 31 and surrounds the second liquid outlet hole 311, the first sealing member 34 and the first blocking part 321 jointly close the second liquid outlet hole 311; and / or the drain valve 30 further comprises a second sealing member 35 connected to one end of the second blocking part 323 facing the second liquid outlet hole 311, when the drain valve 30 bears liquid with a weight less than a preset range, the second sealing member 35 is in sealing cooperation with the valve body 31 and surrounds the second liquid outlet hole 311, the second sealing member 35 and the second blocking part 323 close the second liquid outlet hole 311. The valve body 31 comprises a valve plate 312 and a valve wall 313 surrounding and connected to the four sides of the valve plate 312, the valve wall 313 is installed on the first liquid outlet hole 113, the valve plate 312 is provided with the second liquid outlet hole 311, the valve plate 312 is located between the first blocking part 321 and the second blocking part 323, the rod part 322 is inserted into the valve plate 312, the valve wall 313 and the valve plate 312 form a first valve cavity 314, and the first blocking part 321 is located in the first valve cavity 314. The first blocking part 321 comprises a cover body 3211 and a sealing part 3212, one end of the cover body 3211 away from the second liquid outlet hole 311 is in sealing connection with the rod part 322, the radial dimension of the cover body 3211 gradually increases from the one end of the cover body 3211 away from the second liquid outlet hole 311 to the one end of the cover body 3211 facing the second liquid outlet hole 311, and the sealing part 3212 is connected to the one end of the cover body 3211 facing the second liquid outlet hole 311 and is used for closing the second liquid outlet hole 311. The preset range weight is 1g-1000g. The liquid discharge rate of the drain valve 30 is x kg / 24h, x is a numerical value and is less than or equal to 30. The amount of electricity stored by the energy storage device 100 is y MWh, y is a numerical value and is less than or equal to 20, and the ratio of x / y is in the interval 0.01 to 30. The amount of electricity stored by the energy storage device 100 is y MWh, y is a numerical value and is less than or equal to 20, the number of drain valves 30 is z, and the ratio of y / z is in the interval 0.05 to 20. The bottom wall 11 comprises opposite first and second surfaces 111 and 112, the first surface 111 is used for mounting the battery rack 20, the first liquid outlet hole 113 penetrates the first and second surfaces 111 and 112, the bottom wall 11 is provided with a groove 1111 on the first surface 111, which is recessed in a direction away from the battery rack 20, and the first liquid outlet hole 113 is provided in the groove 1111. From the first surface 111 to the second surface 112, the size of the groove 1111 along the second direction Y gradually decreases, and the second direction Y is any direction intersecting the arrangement direction of the first and second surfaces 111 and 112.The box 10 comprises a first side wall 13 and a second side wall 14 connected to the bottom wall 11, the first side wall 13 is provided with a door body 131, the battery holder 20 is located between the first side wall 13 and the second side wall 14, the groove 1111 is located between the first side wall 13 and the second side wall 14 and is arranged close to the first side wall 13, the first liquid outlet hole 113 is arranged in the direction close to the first side wall 13 and deviates from the center position of the opening of the groove 1111. The maximum distance between the first liquid outlet hole 113 facing one end of the battery holder 20 and the first surface 111 is H1, the axial dimension of the first liquid outlet hole 113 is H2, H1 / H2 = 0.08-0.3, the first direction X is the arrangement direction of the battery holder 20 to the bottom wall 11. Along the first direction X, the size of the box 10 is H3, H2 / H3 = 0.01-0.05. The bottom wall 11 comprises opposite first surface 111 and second surface 112, the first surface 111 is used for mounting the battery holder 20, the first liquid outlet hole 113 penetrates the first surface 111 and the second surface 112, the first surface 111 and / or the second surface 112 is coated with a waterproof coating, and / or the first surface 111 and / or the second surface 112 is provided with a moisture absorbing piece 40.

[0126] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0127] Finally, it should be noted that: the above examples 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 examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

An energy storage device, wherein, The application relates to a battery box. The battery box comprises a box body, a plurality of battery groups, a battery rack, and a drain valve. The box body comprises a bottom wall provided with a first drain hole. The battery rack is arranged in the box body and used for carrying the battery groups. The drain valve is arranged in the first drain hole and used for draining liquid in the box body. The drain valve is configured to be opened when a preset range of liquid weight is borne, and closed when liquid weight less than and greater than the preset range is borne. The energy storage device of claim 1, wherein The drain valve comprises a valve body, a sealing member, and an elastic member. The valve body is arranged in the first drain hole and provided with a second drain hole. The energy storage device of claim 2, wherein The sealing member is slidably connected to the valve body in a first direction. The elastic member is in abutment with the valve body and the sealing member, respectively. When the drain valve bears the preset range of liquid weight, the sealing member opens the second drain hole. When the drain valve bears liquid weight less than and greater than the preset range, the sealing member closes the second drain hole. The energy storage device of claim 3, wherein The first direction is the arrangement direction of the battery rack to the bottom wall. The sealing member comprises a first sealing part, a rod part, and a second sealing part connected in sequence in the first direction. The rod part is inserted into the valve body and can slide relative to the valve body in the first direction. The first sealing part is located at one end of the rod part close to the battery rack. The second sealing part is located at one end of the rod part away from the battery rack. The elastic member is sleeved on the rod part. One end of the elastic member is in abutment with the valve body, and the other end is in abutment with the first sealing part or the second sealing part. When the drain valve bears liquid weight less than the preset range, the first sealing part opens the second drain hole, and the second sealing part seals the second drain hole. When the drain valve bears the preset range of liquid weight, the elastic member deforms, the first sealing part opens the second drain hole, and the second sealing part moves to form a gap with the second drain hole to open the second drain hole. When the drain valve bears liquid weight greater than the preset range, the elastic member deforms, and the first sealing part moves to seal the second drain hole. The drain valve further comprises a first sealing member connected to one end of the first sealing part facing the second drain hole. When the drain valve bears liquid weight greater than the preset range, the first sealing member is in abutment and sealing cooperation with the valve body and surrounds the second drain hole. The first sealing member and the first sealing part jointly seal the second drain hole. And / or, the drain valve further comprises a second sealing member connected to one end of the second sealing part facing the second drain hole. When the drain valve bears liquid weight less than the preset range, the second sealing member is in abutment and sealing cooperation with the valve body and surrounds the second drain hole. The second sealing member and the second sealing part seal the second drain hole. The energy storage device of claim 4, wherein The valve body comprises a valve plate and a valve wall connected to the periphery of the valve plate, the valve wall is installed on the first liquid discharge hole, the valve plate is provided with the second liquid discharge hole, the valve plate is located between the first sealing part and the second sealing part, the rod part is inserted into the valve plate, the valve wall and the valve plate form a first valve cavity, and the first sealing part is located in the first valve cavity. The energy storage device according to claims 3-5, wherein, The first sealing part comprises a cover body and a sealing part, one end of the cover body away from the second liquid discharge hole is in sealing connection with the rod part, the radial dimension of the cover body gradually increases from the one end of the cover body away from the second liquid discharge hole to the one end of the cover body facing the second liquid discharge hole, and the sealing part is connected to the one end of the cover body facing the second liquid discharge hole and used for closing the second liquid discharge hole. The energy storage device according to any one of claims 1 to 6, wherein The preset range weight is 1g-1000g. The energy storage device according to any one of claims 1 to 6, wherein The liquid discharge rate of the drain valve is x kg / 24h, x is a numerical value and is less than or equal to 30. The energy storage device of claim 8, wherein, The energy storage device stores y MWh of electricity, y is a numerical value and is less than or equal to 20, and the ratio of x / y is in the interval 0.01-30. The energy storage device according to any one of claims 1 to 6, wherein The energy storage device stores y MWh of electricity, y is a numerical value and is less than or equal to 20, and the number of drain valves is z, and the ratio of y / z is in the interval 0.05-20. The energy storage device according to any one of claims 1 to 6, wherein The bottom wall comprises opposite first and second surfaces, the first surface is used for mounting the battery rack, the first liquid discharge hole penetrates the first and second surfaces, and the bottom wall is provided with a groove on the first surface, and the first liquid discharge hole is arranged in the groove. The energy storage device of claim 11, wherein, From the first surface to the second surface, the size of the groove along the second direction gradually decreases, and the second direction is any direction intersecting the arrangement direction from the first surface to the second surface. The energy storage device of claim 12, wherein, The box body comprises first and second side walls connected to the bottom wall, the first side wall is provided with a door body, the battery rack is located between the first and second side walls, the groove is located between the first and second side walls and is arranged close to the first side wall, and the first liquid discharge hole is arranged close to the first side wall and deviates from the center position of the opening of the groove. The energy storage device according to any one of claims 1 to 6, wherein The bottom wall comprises opposite first and second surfaces, the first surface is used for mounting the battery rack, the maximum distance between the first surface and the one end of the first liquid discharge hole facing the battery rack is H1, and the axial dimension of the first liquid discharge hole is H2, H1 / H2=0.08-0.

3. The energy storage device of claim 14, wherein, Along the arrangement direction from the battery rack to the bottom wall, the size of the box body is H3, and H2 / H3=0.01-0.

05. The energy storage device according to any one of claims 1 to 6, wherein The bottom wall comprises opposite first and second surfaces, the first surface is used for mounting the battery rack, the first liquid discharge hole penetrates the first and second surfaces, a waterproof coating is coated on the first and / or second surfaces, and / or a moisture absorbing member is mounted on the first and / or second surfaces.

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