Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a box body, the box body comprises a first box body part and a second box body part, the first box body part and the second box body part are buckled and jointly define a containing space, and the first box body part is located below the second box body part; the battery monomer assembly comprises a plurality of battery monomers, and the plurality of battery monomers are positioned in the accommodating space; liquid outlets of the multiple liquid discharging valves are located outside the containing space, liquid inlets of the multiple liquid discharging valves communicate with the containing space, and at least two liquid discharging valves are located at different positions of the first box body part in the height direction of the first box body part. When the cooling liquid is accumulated in the accommodating space, the at least two drain valves can be opened step by step according to the height of the liquid level, or the plurality of drain valves can be opened at the same time, so that the height of the liquid level is reduced, the probability of short circuit of the two electrode terminals of the single battery due to the too high liquid level can be reduced, and the safety of the single battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] The cooling pipeline inside the battery device is filled with cooling liquid, which can be used to cool the battery cells in the box of the battery device. When the battery cells are in thermal runaway, the cooling liquid needs to be sprayed on the battery cells. In the case of thermal runaway of the battery cells or leakage of the cooling liquid in the cooling pipeline, the cooling liquid will accumulate in the box. Too much cooling liquid will cause short circuit of the battery cells. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery device, a power utilization device and an energy storage device, which can improve the situation that too much thermal cooling liquid causes short circuit of the battery cells, so as to improve the safety of the battery device.

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] The box comprises a first box part and a second box part, the first box part and the second box part are buckled and jointly define a containing space, and the first box part is located below the second box part.

[0006] The battery cell assembly comprises a plurality of battery cells, and the plurality of battery cells are located in the containing space.

[0007] The plurality of liquid discharge valves are arranged along the height direction of the first box part, and the liquid inlet of at least two liquid discharge valves is located at different positions of the first box part. The liquid discharge valve is configured to discharge the cooling liquid in the containing space.

[0008] When the cooling liquid accumulates in the containing space, such as when the battery cells are in thermal runaway and need to be cooled by the cooling liquid, or when the cooling liquid used to cool the battery cells leaks, the plurality of liquid discharge valves can be opened step by step according to the height of the liquid level, or simultaneously opened, so as to more efficiently discharge the cooling liquid in the box, reduce the liquid level, and thus reduce the probability of short circuit of the two electrode terminals of the battery cells caused by the high liquid level, thereby improving the safety of the battery cells.

[0009] In some embodiments, a part of the number of liquid discharge valves are arranged at the bottom of the first box part, and the other part of the number of liquid discharge valves are arranged at the side wall of the first box part.

[0010] Thus, a part of the number of liquid discharge valves is arranged at the bottom of the first tank portion, and the cooling liquid in the first tank portion can be completely discharged. A part of the number of liquid discharge valves is arranged at the side wall of the first tank portion. When the rising speed of the cooling liquid in the first tank portion is greater than the discharge speed of the liquid discharge valve at the bottom of the first tank portion, the liquid discharge speed can be increased by opening the liquid discharge valve at the side wall of the first tank portion, so as to reduce the probability of short circuit of the two electrode terminals of the battery monomer due to the excessively high liquid level, thereby improving the safety of the battery monomer.

[0011] In some embodiments, the liquid discharge valve includes a first liquid discharge valve, a second liquid discharge valve, and a third liquid discharge valve. The first liquid discharge valve and the second liquid discharge valve are arranged at the side wall of the first tank portion, and along the height direction of the first tank portion, the distance from the liquid inlet of the first liquid discharge valve to the bottom of the first tank portion is greater than the distance from the liquid inlet of the second liquid discharge valve to the bottom of the first tank portion. The third liquid discharge valve is arranged at the bottom of the first tank portion.

[0012] Thus, the liquid level of the cooling liquid can be divided into three risk levels according to the height of the cooling liquid level. When the cooling liquid level is higher than the liquid inlet of the first liquid discharge valve, the risk of short circuit of the battery monomer is the highest at this time. The maximum liquid discharge speed can be achieved by opening the first liquid discharge valve, the second liquid discharge valve, and the third liquid discharge valve, so as to reduce the risk level. When the cooling liquid level is between the liquid inlet of the first liquid discharge valve and the liquid inlet of the second liquid discharge valve, the risk of short circuit of the battery monomer is moderate at this time. The cooling liquid level can be lowered by opening the second liquid discharge valve and the third liquid discharge valve to discharge, so as to reduce the risk level. When the cooling liquid level is between the liquid inlet of the second liquid discharge valve and the liquid inlet of the third liquid discharge valve, the risk of short circuit of the battery monomer is the lowest at this time. The liquid discharge can be performed by opening the third liquid discharge valve. Therefore, by arranging the first liquid discharge valve, the second liquid discharge valve, and the third liquid discharge valve, according to the different risk levels of short circuit of the battery monomer, and according to the height of the liquid level of the cooling liquid, the first liquid discharge valve, the second liquid discharge valve, and the third liquid discharge valve can be opened in the corresponding order, so as to improve the safety of the battery monomer.

[0013] In some embodiments, the battery monomer includes a shell, and the top wall of the shell is provided with an electrode terminal. Along the height direction of the first tank portion, the liquid discharge valve with the maximum distance from the bottom of the first tank portion is the first liquid discharge valve. The maximum distance from the liquid inlet of the first liquid discharge valve to the bottom of the first tank portion is H1, the distance from the top wall of the shell to the bottom of the first tank portion is H2, and H1 is less than H2.

[0014] Thus, in the case that the liquid level of the cooling liquid is not higher than the height of the shell, all the liquid discharge valves can be opened, so as to reduce the probability of short circuit of the battery monomer caused by the excessively fast rising of the cooling liquid, thereby improving the safety of the battery monomer.

[0015] In some embodiments, H2-H1≥1 / 2H2.

[0016] When the battery device is used in a place with a certain slope, such as during vehicle driving, the battery device is inclined at a certain angle due to uneven road surface. At this time, if the battery monomer occurs thermal runaway, the cooling liquid for cooling the battery monomer accumulates in the containing space, the distance between the electrode terminals of the plurality of battery monomers and the liquid surface is not equal, and when the liquid surface is too high, a part of the battery monomers may be short-circuited. Therefore, the first liquid discharge valve needs to be arranged below the electrode terminal, that is, H2-H1≥1 / 2H2, which can reduce the probability that the cooling liquid short-circuits part of the battery monomers when the battery device is inclined, thereby improving the safety of the battery device.

[0017] In some embodiments, the battery monomer includes a shell, the shell is provided with an electrode terminal towards one side of the side wall of the first box part, along the height direction of the first box part, the liquid discharge valve farthest from the bottom of the first box part is the first liquid discharge valve, the maximum distance from the liquid inlet of the first liquid discharge valve to the bottom of the first box part is H1, and the minimum distance from the electrode terminal to the bottom of the first box part is H3, and H1 is less than H3.

[0018] Therefore, all the liquid discharge valves can be opened when the liquid level of the cooling liquid is not higher than the electrode terminal, so as to reduce the probability that the cooling liquid rises too fast and causes the battery monomer to be short-circuited, thereby improving the safety of the battery monomer.

[0019] In some embodiments, along the height direction of the first box part, the height of the shell is H4, and H3-H1≥1 / 2H4.

[0020] When the battery device is used in a place with a certain slope, such as during vehicle driving, the battery device is inclined at a certain angle due to uneven road surface. At this time, if the battery monomer occurs thermal runaway, the cooling liquid for cooling the battery monomer accumulates in the containing space, the distance between the electrode terminals of the plurality of battery monomers and the liquid surface is not equal, and when the liquid surface is too high, a part of the battery monomers may be short-circuited. Therefore, the first liquid discharge valve needs to be arranged below the electrode terminal, that is, H3-H1≥1 / 2H4, which can reduce the probability that the cooling liquid short-circuits part of the battery monomers when the battery device is inclined, thereby improving the safety of the battery device.

[0021] In some embodiments, the battery device further includes a liquid level detection component arranged in the containing space, and the liquid level detection component is used to detect the liquid level height of the cooling liquid.

[0022] By detecting the liquid level height of the cooling liquid through the liquid level detection component, one or more of the plurality of liquid discharge valves can be controlled to be opened according to the liquid level height, so as to timely discharge the cooling liquid and reduce the probability that the battery monomer is short-circuited.

[0023] In some embodiments, the liquid drainage valve comprises an active valve configured to open when the liquid level of the cooling liquid reaches a predetermined position.

[0024] In this way, the cooling liquid can be drained by actively opening the liquid drainage valve when the liquid level of the cooling liquid reaches a predetermined position, thereby reducing the probability of short circuit of the battery cell.

[0025] In some embodiments, the liquid drainage valve comprises a passive valve configured to open when the cooling liquid reaches a predetermined pressure.

[0026] When the height of the cooling liquid is greater than the height of the liquid drainage valve, as the liquid level of the cooling liquid rises, the pressure of the cooling liquid on the liquid drainage valve gradually increases, and when the pressure reaches a predetermined pressure, the liquid drainage valve automatically opens to achieve automatic liquid drainage. Compared with the active opening of the liquid drainage valve, the control process can be reduced, and the opening of the liquid drainage valve is more reliable.

[0027] In some embodiments, the passive valve comprises one or both of a pressure relief valve and an overflow valve.

[0028] In this way, the passive valve can be opened by the pressure of the cooling liquid to enable liquid drainage at a predetermined liquid level, thereby reducing the risk of short circuit of the battery cell.

[0029] In a second aspect, the present application provides a power consumption device comprising the battery device of the first aspect, the battery device being configured to provide electric energy to the power consumption device.

[0030] Since the power consumption device comprises all the technical features of the battery device of the first aspect, the effects are the same as described above, and will not be repeated here.

[0031] In a third aspect, the present application provides an energy storage device comprising:

[0032] a cabinet body;

[0033] at least one battery cluster arranged in the cabinet body, the battery cluster comprising the battery device of the first aspect.

[0034] Since the energy storage device comprises all the technical features of the battery device of the first aspect, the effects are the same as described above, and will not be repeated here.

[0035] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the scope of the present application. The same reference numbers in different drawings identify the same components. In the drawings:

[0037] Figure 1 A perspective view of a battery cell according to an embodiment of the present application;

[0038] Figure 2 A perspective view of a battery device according to an embodiment of the present application;

[0039] Figure 3 A structure view of a power consuming device according to an embodiment of the present application, which is a vehicle;

[0040] Figure 4 A perspective view of an energy storage device according to an embodiment of the present application;

[0041] Figure 5 A sectional view of a first cross section of a battery device according to an embodiment of the present application, which is perpendicular to the height direction of the case;

[0042] Figure 6 A sectional view of a first cross section of a battery device according to another embodiment of the present application.

[0043] Reference signs in the detailed description of the embodiments are as follows:

[0044] 1000, vehicle;

[0045] 100, battery device;

[0046] 10, case; 11, first case portion; 12, second case portion;

[0047] 20, battery cell assembly; 21, battery cell; 211, outer shell; 2111, end cap; 21111, electrode terminal; 212, electrode assembly; 213, pressure relief mechanism; 30, liquid discharge valve; 31, first liquid discharge valve; 32, second liquid discharge valve; 33, third liquid discharge valve; 40, liquid level detection member;

[0048] 2000, energy storage device; 2100, cabinet; 2200, battery cluster;

[0049] Z, height direction. DETAILED DESCRIPTION

[0050] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0053] 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 appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or necessarily alternatives to other embodiments. It will be explicitly and implicitly appreciated by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

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

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] The spray pipeline inside the battery device is provided with cooling liquid, which can be used for cooling the battery monomer in the box of the battery device. The problem is that the cooling liquid in the box may accumulate, which can easily cause short circuit of the battery monomer. The large accumulation of cooling liquid can be caused by leakage of the spray pipeline, or can be caused by the spray device spraying cooling to the battery monomer when the battery is out of control.

[0059] Therefore, the present application provides a battery device, a plurality of drain valves are arranged along the height direction of the first box part. When the cooling liquid accumulates in the containing space, such as when the battery monomer is out of control, the cooling liquid needs to be cooled to the battery monomer out of control, or the cooling liquid for cooling the battery monomer leaks, the plurality of drain valves can be opened step by step according to the height of the liquid level, or the plurality of drain valves can be opened at the same time, so that the cooling liquid in the box can be discharged more efficiently, the liquid level is reduced, thereby reducing the probability of short circuit of the two electrode terminals of the battery monomer due to the too high liquid level, so as to improve the safety of the battery monomer.

[0060] Please refer to Figure 1 The battery monomer 21 generally includes an electrode assembly 212. The electrode assembly 212 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery monomer 21, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short circuiting, and at the same time allows the active ions to pass through.

[0061] In some embodiments, the battery cell 21 further comprises an electrolyte, which functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application and can be selected as desired. The electrolyte can be in a liquid, gel or solid state. In some embodiments, the electrolyte can optionally further comprise an additive. For example, the additive can comprise a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive capable of improving certain properties of the battery cell 21, such as an additive capable of improving the overcharge / fast charge performance of the battery cell 21, an additive capable of improving the high-temperature performance of the battery cell 21, an additive capable of improving the low-temperature performance of the battery cell 21, and the like.

[0062] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0063] In some embodiments, the electrode assembly 212 can have a cylindrical shape, a flat shape, or a multi-prismatic shape, or the like.

[0064] In some embodiments, the electrode assembly 212 can be provided with a tab, which can lead current out of the electrode assembly 212. The tab can comprise a positive tab and a negative tab.

[0065] In some embodiments, as shown in Figure 1 , the battery cell 21 can comprise a housing 211. The housing 211 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0066] In some embodiments, the housing 211 can be a sealed structure or a non-sealed structure. As an example, when the housing 211 is a non-sealed structure, the housing 211 functions to protect the electrode assembly 212, and a sealing bag can be further included between the housing 211 and the electrode assembly 212, the sealing bag being used to package the electrode assembly 212 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing 211 is a sealed structure, the housing 211 is used to package the electrode assembly 212 and the electrolyte, and the like.

[0067] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape, and the prismatic battery cell can include a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, or the like, and the present application is not particularly limited.

[0068] In some embodiments, as shown in Figure 1The shell 211 includes an end cap 2111 and a shell body 2112. The shell body 2112 is provided with an opening, and the end cap 2111 is provided on the opening. The shell body 2112 can be provided with one or more openings. The end cap 2111 can also be provided with one or more openings.

[0069] In some embodiments, referring to Figure 1 The shell 211 is provided with at least one electrode terminal 21111 electrically connected to the tab. The electrode terminal 21111 can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal 21111 can be provided on the end cap 2111 or on the shell body 2112.

[0070] In some embodiments, referring to Figure 1 The shell 211 is provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is used to discharge the internal gas of the battery monomer 21.

[0071] As an example, the pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery monomer 21 reaches a predetermined threshold. When the internal pressure or temperature of the battery monomer 21 reaches the predetermined threshold, the pressure relief mechanism 213 performs an action or a weak structure provided in the pressure relief mechanism 213 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery monomer 21.

[0072] As an example, the pressure relief mechanism 213 can be integrally formed with the shell 211.

[0073] As an example, the pressure relief mechanism 213 can also be provided separately from the shell 211 and connected to the shell 211.

[0074] The "actuation" mentioned in the present application refers to the pressure relief mechanism 213 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery monomer 21 can be released. The action generated by the pressure relief mechanism 213 can include but is not limited to: the movement of the components in the pressure relief mechanism 213 forming an exhaust passage, at least a part of the pressure relief mechanism 213 being broken, crushed, torn or opened, etc. When the pressure relief mechanism 213 is actuated, the high-temperature and high-pressure substances in the interior of the battery monomer 21 will be discharged outward from the actuated part as exhaust. In this way, the battery monomer 21 can be relieved of pressure and temperature under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0075] In some embodiments, when the shell 211 is a non-sealed structure, the pressure relief mechanism 213 can be provided as a through hole for discharging the gas in the interior of the battery monomer 21.

[0076] The emissions from the battery cell 21 mentioned in the present application include, but are not limited to, electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, reaction-generated high-temperature and high-pressure gas, flames, and the like.

[0077] Please refer to Figure 2 The battery apparatus 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 can include a plurality of battery cells 21 connected in series, in parallel, or in a mixed connection through a busbar component.

[0078] In some embodiments, the battery cell assembly 20 is generally formed by arranging a plurality of battery cells 21.

[0079] As an example, the battery cell assembly 20 can be a battery module formed by arranging and fixing a plurality of battery cells 21 into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 21 with a cable tie.

[0080] In some embodiments, the battery apparatus 100 can be a battery pack including a case 10 and one or more battery cell assemblies 20 accommodated in the case 10.

[0081] As an example, the battery cell assembly 20 can be a battery module, and the battery cell assembly 20 can be accommodated in the case 10 by fixing the battery module in the case 10.

[0082] As an example, the battery cell assembly 20 can also be accommodated in the case 10 by directly fixing a plurality of battery cells 21 in the case 10.

[0083] As an example, please refer to Figure 2 The case 10 can include a first case portion 11 and a second case portion 12. The first case portion 11 and the second case portion 12 are coupled so that an enclosed space is formed inside the case 10 to accommodate the battery cell assembly 20. Here, the enclosed means covered or closed, and can be sealed or unsealed. The first case portion 11 can be a top cover or a bottom plate.

[0084] As an example, the case 10 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively coupled to the frame so that an enclosed space is formed inside the case 10 to accommodate the battery cell assembly 20.

[0085] In some embodiments, please refer to Figure 3The box 10 can be part of a chassis structure of the vehicle 1000. For example, part of the box 10 can be part of a floor of the vehicle 1000, or part of the box 10 can be part of a cross beam and a longitudinal beam of the vehicle 1000.

[0086] The technical solutions described in the embodiments of the present application are applicable to various electric devices using the battery monomer 21, such as a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle 1000, a ship, and a spacecraft, such as an aircraft, a rocket, a space shuttle, and a spacecraft.

[0087] An energy storage device 2000 is provided in the embodiments of the present application. Please refer to Figure 4 The energy storage device 2000 can include a cabinet 2100 and at least one battery cluster 2200 (Battery Cluster). The battery cluster 2200 is accommodated in the cabinet 2100. The battery cluster 2200 can include a plurality of battery devices 100.

[0088] The battery cluster 2200 (Battery Cluster) can improve the voltage and capacity of the energy storage device 2000. The battery cluster 2200 can include a plurality of battery devices 100. The plurality of battery devices 100 are connected in series through a busbar component to improve the voltage of the energy storage device 2000. When the energy storage device 2000 includes a plurality of battery clusters 2200, the plurality of battery clusters 2200 are connected in parallel to improve the capacity of the energy storage device 2000.

[0089] The energy storage device 2000 can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device 2000 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 2000 can store electrical energy during a low electricity consumption period, and provide electrical energy for related users or electrical equipment during a high electricity consumption period. The energy storage system provided in the embodiments of the present application can be any power system that needs to use the energy storage device 2000.

[0090] In some embodiments, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0091] The following embodiments are described for convenience of illustration. Please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 A battery device 100 according to some embodiments of the present application is described as an example.

[0092] The battery device 100 comprises a box body 10, a battery cell assembly 20 and a plurality of liquid discharge valves 30. The box body 10 comprises a first box body part 11 and a second box body part 12, the first box body part 11 and the second box body part 12 are buckled and jointly define a containing space, the first box body part 11 is located below the second box body part 12. The battery cell assembly 20 comprises a plurality of battery cells 21, the plurality of battery cells 21 are located in the containing space. The liquid discharge ports of the plurality of liquid discharge valves 30 are located outside the containing space, the liquid inlet ports of the plurality of liquid discharge valves 30 are respectively communicated with the containing space, at least two liquid discharge valves 30 are located at different positions of the first box body part 11 along the height direction Z of the first box body part 11, and the liquid discharge valves 30 are configured to discharge the cooling liquid in the containing space.

[0093] The plurality of battery cells 21 can be arranged in at least one row in the box body 10, or can be arranged in multiple rows and multiple columns, and the arrangement can be performed according to actual use requirements.

[0094] All the liquid discharge valves 30 can be arranged on the side wall of the first box body part 11; please refer to Figure 5 and Figure 6 A part of the liquid discharge valves 30 can be arranged on the bottom of the first box body part 11, and the other part of the liquid discharge valves 30 can be arranged on the side wall of the first box body part 11. At the same height position of the first box body part 11, the number of the first liquid discharge valves 30 can be one or multiple.

[0095] During the liquid discharge process, the plurality of liquid discharge valves 30 can be opened simultaneously, or can be opened step by step from bottom to top according to the risk level set according to the liquid level height.

[0096] The plurality of liquid discharge valves 30 are arranged along the height direction Z of the first box body part 11, when the cooling liquid is accumulated in the containing space, such as when the battery cell 21 is in thermal runaway, the cooling liquid needs to be used to cool the battery cell 21 in thermal runaway, or the cooling liquid used to cool the battery cell 21 leaks, the plurality of liquid discharge valves 30 can be opened step by step according to the liquid level height or simultaneously opened, so as to reduce the liquid level height, thereby reducing the probability of short circuit of the two electrode terminals 21111 of the battery cell 21 caused by the too high liquid level, and improving the safety of the battery cell 21.

[0097] In some embodiments, please refer to Figure 5 A part of the number of liquid discharge valves 30 are arranged on the bottom of the first box body part 11, and the other part of the number of liquid discharge valves 30 are arranged on the side wall of the first box body part 11.

[0098] As an example, the number of the drain valves 30 is three, wherein one drain valve 30 is arranged on the bottom of the first tank portion 11, two drain valves 30 are arranged on the side wall of the first tank portion 11, and the two drain valves 30 arranged on the side wall of the first tank portion 11 are spaced apart along the height direction Z of the first tank portion 11. In other examples, the number of the drain valves 30 arranged on the side wall of the first tank portion 11 can be one or more than three.

[0099] Therefore, a part of the number of the drain valves 30 arranged on the bottom of the first tank portion 11 can drain all the cooling liquid in the first tank portion 11, and a part of the number of the drain valves 30 arranged on the side wall of the first tank portion 11 can increase the draining speed by opening the drain valves 30 arranged on the side wall of the first tank portion 11 when the rising speed of the cooling liquid in the first tank portion 11 is greater than the draining speed of the drain valves 30 arranged on the bottom of the first tank portion 11, so as to reduce the probability of short circuiting the two electrode terminals 21111 of the battery monomer 21 due to the excessively high liquid level, thereby improving the safety of the battery monomer 21.

[0100] In some embodiments, referring to Figure 5 , the drain valves 30 include a first drain valve 31, a second drain valve 32, and a third drain valve 33, the first drain valve 31 and the second drain valve 32 are arranged on the side wall of the first tank portion 11, the third drain valve 33 is arranged on the bottom of the first tank portion 11, and the distance from the liquid inlet of the first drain valve 31 to the bottom of the first tank portion 11 is greater than the distance from the liquid inlet of the second drain valve 32 to the bottom of the first tank portion 11.

[0101] Therefore, the liquid level can be divided into three risk levels according to the height of the cooling liquid level, when the cooling liquid level is higher than the liquid inlet of the first drain valve 31, the risk of short circuiting the battery monomer 21 is the highest, and the maximum draining speed can be achieved by the first drain valve 31, the second drain valve 32, and the third drain valve 33 to reduce the risk level; when the cooling liquid level is between the liquid inlet of the first drain valve 31 and the liquid inlet of the second drain valve 32, the risk of short circuiting the battery monomer 21 is moderate, and the second drain valve 32 and the third drain valve 33 can be opened to drain the cooling liquid and lower the cooling liquid level to reduce the risk level; when the cooling liquid level is between the liquid inlet of the second drain valve 32 and the liquid inlet of the third drain valve 33, the risk of short circuiting the battery monomer 21 is the lowest, and the third drain valve 33 can be opened to drain the cooling liquid. Therefore, by arranging the first drain valve 31, the second drain valve 32, and the third drain valve 33, the first drain valve 31, the second drain valve 32, and the third drain valve 33 can be opened in the corresponding order according to the risk level of short circuiting the battery monomer 21 and the height of the cooling liquid level, so as to improve the safety of the battery monomer 21.

[0102] In some embodiments, please refer to Figure 1 and Figure 5 , the battery cell 21 includes a shell 211, the top wall of the shell 211 is provided with an electrode terminal 21111, along the height direction Z of the first box part 11, the liquid outlet valve 30 farthest from the bottom of the first box part 11 is the first liquid outlet valve 30, the maximum distance from the liquid inlet of the first liquid outlet valve 30 to the bottom of the first box part 11 is H1, and the distance from the top wall of the shell 211 to the bottom of the first box part 11 is H2. H1 is less than H2.

[0103] As an example, along the height direction Z of the first box part 11, the first liquid outlet valve 30 and the electrode terminal 21111 can be arranged at a preset distance, that is, the first liquid outlet valve 30 is opened when the height of the cooling liquid during the rising process does not exceed the first liquid outlet valve 30, thereby reducing the probability that the liquid level will immerse the electrode terminal 21111 to cause short circuit. The preset distance is greater than zero, which can be determined according to the actual use scene. For example, the battery device 100 is in a static situation and has no slope, and the preset distance can be set to less than 1 / 5H2, or less than 1 / 4H2, etc. In a specific situation with a certain slope, for example, applied to a vehicle 1000, because the vehicle 1000 is affected by the road surface during driving, it has a certain slope, and the preset distance can be set according to the slope of the road surface.

[0104] Therefore, all the liquid outlet valves 30 can be opened when the liquid level of the cooling liquid is not higher than the height of the shell 211, so as to reduce the probability of short circuit of the battery cell 21 caused by the cooling liquid rising too fast, thereby improving the safety of the battery cell 21.

[0105] In some embodiments, please refer to Figure 5 , H2-H1≥1 / 2H2.

[0106] When the battery device 100 is used in a situation with a certain slope, such as during driving of the vehicle 1000, because the road surface is not flat, the battery device 100 is inclined at a certain angle. At this time, if the battery cell 21 occurs thermal runaway, the cooling liquid for cooling the battery cell 21 accumulates in the containing space, and the distances from the electrode terminals 21111 of the plurality of battery cells 21 to the liquid level are not equal. When the liquid level is too high, a part of the battery cells 21 may be short-circuited. Therefore, the first liquid outlet valve 30 needs to be arranged lower than the electrode terminal 21111, that is, H2-H1≥1 / 2H2, which can reduce the probability of short circuit of part of the battery cells 21 by the cooling liquid when the battery device 100 is inclined, thereby improving the safety of the battery device 100.

[0107] In some embodiments, please refer to Figure 6, the battery cell 21 includes a shell 211, the shell 211 is provided with an electrode terminal 21111 on one side of the side wall of the first box part 11, along the height direction Z of the first box part 11, the liquid outlet valve 30 farthest from the bottom of the first box part 11 is the first liquid outlet valve 30, the maximum distance from the liquid inlet of the first liquid outlet valve 30 to the bottom of the first box part 11 is H1, and the minimum distance from the electrode terminal 21111 to the bottom of the first box part 11 is H3, H1 is less than H3.

[0108] Therefore, all liquid outlet valves 30 can be opened when the liquid level of the cooling liquid is not higher than the electrode terminal 21111, so as to reduce the probability of short circuit of the battery cell 21 caused by the rapid rising of the cooling liquid, thereby improving the safety of the battery cell 21.

[0109] In some embodiments, please refer to Figure 6 , along the height direction of the first box part, the height of the shell is H4, and H3-H1≥1 / 2H4.

[0110] When the battery device is used in a place with a certain slope, such as during vehicle driving, the battery device is inclined at a certain angle due to uneven road surface. At this time, if the battery cell is in thermal runaway, the cooling liquid for cooling the battery cell accumulates in the battery cell, and the distances from the electrode terminals of the plurality of battery cells to the liquid level are different. When the liquid level is too high, a part of the battery cells may be short-circuited. Therefore, the first liquid outlet valve is arranged below the electrode terminal, i.e. H3-H1≥1 / 2H4, which can reduce the probability of short circuit of part of the battery cells by the cooling liquid when the battery device is inclined, thereby improving the safety of the battery device.

[0111] In some embodiments, please refer to Figure 5 and Figure 6 , the battery device 100 further includes a liquid level detection component 40 arranged in the accommodation space, and the liquid level detection component 40 is used to detect the liquid level height of the cooling liquid.

[0112] The liquid level detection component 40 can be a liquid level sensor or a liquid level sensor. Optionally, the liquid level detection component 40 can send a liquid level detection signal to a control unit in the battery device 100, and the control unit can control the opening and closing of the liquid outlet valve 30 according to the liquid level detection signal.

[0113] By detecting the liquid level height of the cooling liquid by the liquid level detection component 40, one or more of the plurality of liquid outlet valves 30 can be controlled to open according to the liquid level height, so as to timely discharge the cooling liquid and reduce the probability of short circuit of the battery cell 21.

[0114] In some embodiments, the liquid outlet valve 30 includes a driven valve configured to open when the liquid level of the cooling liquid rises to a predetermined position.

[0115] The active valve refers to a valve driven by a driving component, which can specifically drive the spool movement by an electromagnet, hydraulic drive, air source drive, or motor to realize the opening and closing of the valve. The active valve includes but is not limited to solenoid valves, hydraulic control valves, hydraulic valves, or air source driven valves, etc. The active valve can be reasonably selected according to the working scene of the battery device 100.

[0116] As an example, the active valve is a solenoid valve, which is in communication connection with the control unit of the battery device 100. The control unit can control the battery valve to open according to the liquid level detection signal reaching the preset liquid level, and the solenoid valve is in a normally closed state when the battery device 100 is normally working. Different risk levels can be set according to the liquid level height in the first tank part 11.

[0117] Therefore, the cooling liquid can be discharged by actively opening the liquid discharge valve 30 when the liquid level of the cooling liquid reaches a predetermined position, so as to reduce the probability of short circuit of the battery monomer 21.

[0118] In some embodiments, the liquid discharge valve 30 includes a passive valve, and the passive valve is configured to open when the cooling liquid reaches a predetermined pressure.

[0119] The passive valve refers to a valve that automatically opens or closes by using the pressure characteristics of the medium.

[0120] When the height of the cooling liquid is greater than the height of the liquid discharge valve 30, as the liquid level of the cooling liquid rises, the pressure of the cooling liquid on the liquid discharge valve 30 also gradually increases, and the liquid discharge valve 30 automatically opens when the pressure reaches a predetermined pressure, so as to realize automatic liquid discharge. Compared with the active opening mode of the liquid discharge valve 30, the control process can be reduced, and the opening of the liquid discharge valve 30 is more reliable.

[0121] In some embodiments, the passive valve includes one or both of a pressure relief valve and an overflow valve.

[0122] As an example, the passive valve includes a pressure relief valve and an overflow valve, which can be arranged at the bottom wall of the first tank part 11, and the overflow valve is arranged at the side wall of the first tank part 11. When the liquid level reaches a predetermined height, the pressure relief valve opens, and if the liquid level continues to rise to a warning height, the overflow valve can overflow. As another example, the passive valve can be only a pressure relief valve, which can be arranged at the bottom wall of the first tank part 11, or at the side wall of the first tank part 11, or at both the bottom wall and the side wall of the first tank part 11.

[0123] Therefore, the passive valve can be opened by the pressure of the cooling liquid to be able to discharge liquid at a predetermined liquid level, thereby reducing the risk of short circuit of the battery monomer 21. In other examples, a part of the number of liquid discharge valves 30 can be active valves, and the other part of the number of liquid discharge valves 30 can be passive valves.

[0124] In some embodiments, the battery device 100 further comprises a spraying component, the spraying component is communicated with a spraying valve, the spraying valve is used to open or close the spraying component, the spraying component is used to spray the cooling liquid to the battery cell 21 to cool the battery cell 21 when the battery cell 21 is thermal runaway.

[0125] In an optional embodiment of the battery device 100, please refer to Figure 1 , Figure 2 , Figure 5 , the battery device 100 comprises a box body 10, a battery cell assembly 20 and a plurality of liquid discharge valves 30. The box body 10 comprises a first box body part 11 and a second box body part 12, the first box body part 11 and the second box body part 12 are buckled and jointly define a containing space, the first box body part 11 is located below the second box body part 12. The battery cell assembly 20 comprises a plurality of battery cells 21, the plurality of battery cells 21 are located in the containing space. The liquid discharge ports of the plurality of liquid discharge valves 30 are located outside the containing space, the liquid inlet ports of the plurality of liquid discharge valves 30 are respectively communicated with the containing space, at least two liquid discharge valves 30 are located at different positions of the first box body part 11 along the height direction Z of the first box body part 11, the liquid discharge valve 30 is configured to discharge the cooling liquid used to cool the battery cell 21 when the battery cell 21 is thermal runaway. The liquid discharge valve 30 comprises a first liquid discharge valve 31, a second liquid discharge valve 32 and a third liquid discharge valve 33, the first liquid discharge valve 31 and the second liquid discharge valve 32 are respectively arranged on the side wall of the first box body part 11, the third liquid discharge valve 33 is arranged on the bottom of the first box body part 11, and along the height direction Z of the first box body part 11, the distance from the liquid inlet port of the first liquid discharge valve 31 to the bottom of the first box body part 11 is greater than the distance from the liquid inlet port of the second liquid discharge valve 32 to the bottom of the first box body part 11. The battery cell 21 comprises an outer shell 211, the top wall of the outer shell 211 is provided with an electrode terminal 21111, along the height direction Z of the first box body part 11, along the height direction Z of the first box body part 11, the maximum distance from the liquid inlet port of the first liquid discharge valve 30 to the bottom of the first box body part 11 is H1, the distance from the top wall of the outer shell 211 to the bottom of the first box body part 11 is H2, H1 is less than H2. The battery device 100 further comprises a liquid level detection component 40, the liquid level detection component 40 is arranged in the containing space, the liquid level detection component 40 is used to detect the liquid level height of the cooling liquid. The liquid level detection component 40 is a liquid level sensor. The liquid discharge valve 30 comprises an active valve or a passive valve.

[0126] The plurality of liquid discharge valves 30 are arranged along the height direction Z of the first box body part 11, when the plurality of cooling liquids are accumulated in the containing space, at least two liquid discharge valves 30 can be opened step by step or a plurality of liquid discharge valves 30 can be opened at the same time according to the height of the liquid level by using the liquid pressure in an active way or a passive way, so as to reduce the liquid level, thereby the probability of short circuiting the two electrode terminals 21111 of the battery cell 21 due to the too high liquid level can be reduced, so as to improve the safety of the battery cell 21.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box includes a first box section and a second box section, the first box section and the second box section are fastened together and jointly define an accommodating space, and the first box section is located below the second box section; A battery cell assembly includes multiple battery cells located within the accommodating space; Multiple drain valves are provided, with their outlets located outside the containment space and their inlets connected to the containment space. Along the height direction of the first housing portion, at least two of the drain valves have their inlets located at different positions within the first housing portion. The drain valves are configured to drain the cooling liquid within the containment space.

2. The battery device according to claim 1, characterized in that, A portion of the drain valves are located at the bottom of the first housing section, and another portion of the drain valves are located on the side wall of the first housing section.

3. The battery device according to claim 2, characterized in that, The drain valve includes a first drain valve, a second drain valve, and a third drain valve. The first drain valve and the second drain valve are respectively disposed on the side wall of the first housing part, and along the height direction of the first housing part, the distance from the liquid inlet of the first drain valve to the bottom of the first housing part is greater than the distance from the liquid inlet of the second drain valve to the bottom of the first housing part. The third drain valve is disposed at the bottom of the first housing part.

4. The battery device according to claim 1, characterized in that, The battery cell includes a housing, and the top wall of the housing is provided with electrode terminals. Along the height direction of the first housing, the drain valve that is furthest from the bottom of the first housing is the first drain valve. The maximum distance from the inlet of the first drain valve to the bottom of the first housing is H1, and the distance from the top wall of the housing to the bottom of the first housing is H2. H1 is less than H2.

5. The battery device according to claim 4, characterized in that, H2-H1≥1 / 2H2.

6. The battery device according to claim 1, characterized in that, The battery cell includes a housing, and an electrode terminal is provided on the side of the housing facing the side wall of the first housing. The drain valve that is furthest from the bottom of the first housing along the height direction of the first housing is the first drain valve. The maximum distance from the inlet of the first drain valve to the bottom of the first housing is H1, and the minimum distance from the electrode terminal to the bottom of the first housing is H3. H1 is less than H3.

7. The battery device according to claim 6, characterized in that, Along the height direction of the first housing portion, the height of the outer shell is H4, and H3-H1≥1 / 2H4.

8. The battery device according to any one of claims 1-7, characterized in that, The battery device also includes a liquid level detection component, which is disposed within the accommodating space and is used to detect the liquid level height of the cooling liquid.

9. The battery device according to any one of claims 1-7, characterized in that, The drain valve includes an active valve configured to open when the liquid level rises to a predetermined position.

10. The battery device according to any one of claims 1-7, characterized in that, The drain valve includes a passive valve configured to open when the liquid reaches a predetermined pressure.

11. The battery device according to claim 10, characterized in that, The passive valve includes one or both of a pressure relief valve and an overflow valve.

12. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-11, the battery device being used to provide electrical energy to the electrical device.

13. An energy storage device, characterized in that, include: Cabinet; At least one battery cluster is housed within the cabinet, the battery cluster comprising a plurality of battery devices as described in any one of claims 1-11.

Images