Battery device, energy storage device and power utilization device

Abstract

The embodiment of the invention provides a battery device, an energy storage device and a power utilization device. The battery device includes a battery cell assembly and a case. The battery cell assembly includes a battery cell including a housing, a pressure relief mechanism, and an electrode terminal. The housing has a first wall on which the pressure relief mechanism and the electrode terminal are provided. The box body comprises a first sub-box body and a second sub-box body which are arranged in the first direction, the first sub-box body comprises a first box wall, the second sub-box body comprises a second box wall, and the first box wall and the second box wall are arranged in a spaced mode in the first direction. The second box wall is located below the first box wall, the battery monomer assembly is contained in the box body, and the battery monomer assembly is located between the first box wall and the second box wall and connected to the first box wall. In the first direction, the second box wall is closer to the first wall than the first box wall, and a cooling flow channel is arranged on the side, away from the first wall, of the second box wall. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a battery device, an energy storage device and an electrical device. Background Art

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

[0003] In the development of battery device technology, how to improve the reliability of battery devices is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a battery device, an energy storage device and an electrical device, which can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions: In a first aspect, the present application provides a battery device. The battery device includes a battery cell assembly and a housing. The battery cell assembly includes a battery cell, and the battery cell includes a housing, a pressure relief mechanism, and an electrode terminal. The housing has a first wall, and the pressure relief mechanism and the electrode terminal are arranged on the first wall. The housing includes a first sub-housing and a second sub-housing arranged along a first direction, the first sub-housing includes a first housing wall, the second sub-housing includes a second housing wall, the first housing wall and the second housing wall are arranged at intervals along the first direction, and the first direction is parallel to the direction of gravity. The second housing wall is located below the first housing wall, the battery cell assembly is accommodated in the housing, the battery cell assembly is located between the first housing wall and the second housing wall, and is connected to the first housing wall. In the first direction, the second housing wall is closer to the first wall than the first housing wall, and a cooling channel is arranged on the side of the second housing wall facing away from the first wall.

[0006] According to the technical solution of the embodiment of the present application, in the direction of gravity, the box body includes a first box wall and a second box wall located below the first box wall. The battery cell assembly is arranged on the first box wall, and the first wall where the electrode terminal and the pressure relief mechanism are arranged is closer to the second box wall, that is, the battery cell assembly is inverted in the box body. Usually, the battery device is arranged at the bottom of the power-consuming device. When the battery cell assembly of the present application releases pressure, the pressure relief mechanism releases pressure downward, which can reduce the impact on the power-consuming device. At the same time, a cooling flow channel is arranged on the second box wall, which is conducive to the condensation of steam in the discharge of the battery cell assembly and adhesion to the second box wall, which can reduce the risk of steam condensing and adhering to the first wall and contacting the electrode terminal to short-circuit, thereby reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0007] In some embodiments, in the first direction, the second box wall is spaced apart from the first wall.

[0008] According to the technical solution of the embodiment of the present application, the second box wall and the first wall are spaced apart, which can reduce the risk of condensed liquid attached to the second box wall contacting the first wall and causing insulation failure of the battery device, thereby facilitating improving the reliability of the battery device.

[0009] In some embodiments, the second box wall is arranged parallel to the first wall.

[0010] According to the technical solution of the embodiment of the present application, the thickness direction of the second box wall is parallel to the thickness direction of the first wall, and the distance between the second box wall and the first wall in the first direction can be set to be the same along the horizontal direction, thereby reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0011] In some embodiments, the second sub-box body further includes a third box wall. In the first direction, the third box wall is disposed on a side of the second box wall away from the first box wall, and the cooling channel is disposed between the second box wall and the third box wall.

[0012] According to the technical solution of the embodiment of the present application, the cooling channel is arranged between the second box wall and the third box wall, that is, the third box wall is arranged on the outside of the cooling channel, thereby reducing the risk of damage to the cooling channel.

[0013] In some embodiments, in the first direction, a surface of the second box wall facing the first wall is provided with a groove.

[0014] According to the technical solution of the embodiment of the present application, a groove is provided on the surface of the second box wall facing the first wall, and condensed liquid formed after the discharge of the battery cell assembly is condensed can be collected in the groove, further reducing the risk of insulation failure of the battery device caused by contact between the condensed liquid and the first wall, thereby improving the reliability of the battery device.

[0015] In the technical solution of the embodiment of the present application, in the first direction, the groove corresponds to the pressure relief mechanism.

[0016] According to the technical solution of the embodiment of the present application, in the first direction, the groove corresponds to the pressure relief mechanism, so that the condensed liquid formed after the condensation of the emissions discharged from the battery cell assembly can be better gathered in the groove under the action of gravity, thereby improving the confluence capacity of the groove, further reducing the risk of insulation failure of the battery device caused by contact between the liquid and the first wall, and improving the reliability of the battery device.

[0017] In some embodiments, the groove has a groove bottom wall and a groove side wall, the groove side wall is arranged around the outer periphery of the groove bottom wall, and in a first direction, one end of the groove side wall is connected to the groove bottom wall, and the other end extends to the surface of the second box wall facing the first wall. In the first direction, the projection of the groove bottom wall at least partially overlaps with the projection of the cooling channel.

[0018] According to the technical solution of the embodiment of the present application, in the first direction, the projection of the bottom wall of the groove covers the projection of the cooling channel, that is, the cooling channel corresponds to the groove, which is beneficial for the condensed liquid formed by the condensation of steam in the exhaust to be better gathered in the groove, thereby improving the confluence capacity of the groove, further reducing the risk of insulation failure of the battery device due to contact between the liquid and the first wall, and improving the reliability of the battery device.

[0019] In some embodiments, the battery device further includes an adsorbent, which is disposed in the box body and is used to adsorb liquid and steam in the box body.

[0020] According to the technical solution of the embodiment of the present application, an adsorbent is arranged in the box body, and the adsorbent can absorb moisture in the air in the box body, further reducing the risk of insulation failure of the battery device due to contact between the liquid and the first wall, thereby improving the reliability of the battery device.

[0021] In some embodiments, the second sub-box is made of a non-conductive material.

[0022] According to the technical solution of the embodiment of the present application, the second sub-box body is made of non-conductive material, that is, the material of the second box wall is also non-conductive material. The steam condenses on the second box wall during pressure relief, thereby reducing the risk of the second box wall being electrified, improving the insulation of the battery device, and improving the reliability of the battery device.

[0023] In some embodiments, the number of battery cells is multiple, and the multiple battery cells are arranged along the second direction, and the second direction intersects the first direction. The battery device includes an end plate, and the end plate is arranged at the end of the battery cell assembly in the second direction.

[0024] According to the technical solution of the embodiment of the present application, the end plate is arranged at the end of the battery cell assembly in the second direction, and the end plate is used to resist the expansion force generated by the charging and discharging of the battery cell assembly, reduce the risk of damage to the battery cell assembly, and improve the reliability of the battery device.

[0025] In some embodiments, the battery device further includes a connector and a busbar component, the connector is disposed on the end plate, the busbar component electrically connects the connector and the electrode terminals, and the connector is used to connect the battery device to an electrical device.

[0026] In the technical solution of the embodiment of the present application, the confluence component realizes the electrical connection between the connector and the electrode terminal, and realizes the electrical connection between the battery device and the power-consuming device through the connector, so as to realize the charging and discharging of the battery device. At the same time, a cooling channel is set on the second box wall, and the steam in the box body is condensed on the second box wall when the battery monomer assembly is depressurized, thereby reducing the risk of the steam condensing and adhering to the first wall and forming a short circuit with the electrode terminal, the confluence component and the connector, reducing the risk of insulation failure of the battery device, and improving the reliability of the battery device.

[0027] In some embodiments, the first box wall is provided with a heat exchange channel, and the heat exchange channel is used to adjust the temperature of the battery cell assembly.

[0028] According to the technical solution of the embodiment of the present application, the charge and discharge performance of the battery cell assembly is affected by temperature. By setting a heat exchange flow channel on the first box wall to adjust the temperature of the battery cell assembly, the charge and discharge performance of the battery cell assembly is improved, and the reliability of the battery device is improved.

[0029] In a second aspect, the present application further provides an energy storage device, comprising an energy storage box and a battery device according to any one of the embodiments in the first aspect, wherein the battery device is disposed in the energy storage box, and the battery device is used to store electrical energy and can provide electrical energy.

[0030] In some embodiments, an angle α is formed between the thickness direction of the second box wall and the gravity direction, satisfying the condition: 0≤α≤60°.

[0031] According to the technical solution of the embodiment of the present application, there is an angle between the thickness direction of the second box wall and the gravity direction, that is, the battery device is arranged to be inclined, and the inclination angle satisfies the above conditions, which is convenient for collecting the liquid produced by the condensation of steam during pressure relief, reduces the risk of insulation failure of the battery device, improves the reliability of the battery device, and thus improves the reliability of the energy storage device.

[0032] In a third aspect, the present application further provides an electrical device, comprising a battery device according to any one of the embodiments in the first aspect, and the battery device is used to provide electrical energy to the electrical device.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application; Figure 2 An exploded view of a battery device provided in some embodiments of the present application; Figure 3 An exploded view of a battery cell provided for some embodiments of the present application; Figure 4 A schematic diagram of the internal structure of a battery device provided in some embodiments of the present application; Figure 5 A schematic diagram of a box provided in some embodiments of the present application; Figure 6 for Figure 5 A in the enlarged view; Figure 7 A schematic diagram of the internal structure of a battery device provided in some embodiments of the present application from another perspective; Figure 8 A schematic diagram of an energy storage device provided in some embodiments of the present application; Fig. 9 Schematic diagram of energy storage devices provided in other embodiments of the present application.

[0036] Icons: 1-battery device; 10-battery cell assembly; 11-battery cell; 111-first wall; 112-pressure relief mechanism; 113-electrode terminal; 114-housing; 1141-shell; 1142-end cover; 115-electrode assembly; 20-box; 21-first box wall; 211-heat exchange channel; 22-second box wall; 221-cooling channel; 222-cavity; 223-groove; 2231-bottom wall of groove; 2232-side wall of groove; 23-first sub-box; 24-second sub-box; 25-third box wall; 30-adsorbent; 40-end plate; 50-connector; 60-collecting component; 100-energy storage device; 110-energy storage box; 200-vehicle; 210-controller; 220-motor; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0039] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The term "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or the second direction can represent: A exists alone, A and the second direction exist at the same time, and the second direction exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0042] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0043] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0044] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0045] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0046] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0047] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0048] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0049] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0050] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0051] In some embodiments, the energy storage device may include multiple battery devices. The energy storage device includes an energy storage box, and at least one side of the energy storage box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0054] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or internal conditions of the battery change, the reliability of the battery device is also one of the key factors to consider.

[0055] At present, the battery cell assembly is arranged in the box body and supported by the first box wall to form a battery device. The battery device is usually arranged at the bottom of the power-consuming device, such as the battery device is arranged at the bottom of the vehicle. When the battery device is depressurized, it will spray out high-temperature emissions (such as electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flames, etc.). In order to reduce the damage of the emissions of the battery device to the power-consuming device during depressurization, the pressure relief mechanism of the battery cell assembly is usually arranged downward.

[0056] However, the pressure relief mechanism and the electrode terminals are usually arranged on the same wall of the housing. When the pressure relief mechanism releases pressure, there is a risk that the discharged exhaust will adhere to the first box wall in the form of liquid after cooling, thereby causing the liquid to adhere to the electrode terminals, causing the electrode terminals to form a short circuit, causing the battery device insulation failure, and affecting the reliability of the battery device.

[0057] Based on the above considerations, in order to solve the problem that liquid adheres to the electrode terminal, causing the insulation failure of the battery device and affecting the reliability of the battery device, an embodiment of the present application provides a battery device. The battery device includes a battery cell assembly and a box. The battery cell assembly includes a battery cell, and the battery cell includes a shell, a pressure relief mechanism and an electrode terminal. The shell has a first wall, and the pressure relief mechanism and the electrode terminal are arranged on the first wall. The box includes a first sub-box and a second sub-box arranged along a first direction, the first sub-box includes a first box wall, the second sub-box includes a second box wall, the first box wall and the second box wall are arranged at intervals along the first direction, and the first direction is parallel to the direction of gravity. The second box wall is located below the first box wall, the battery cell assembly is accommodated in the box, the battery cell assembly is located between the first box wall and the second box wall, and is connected to the first box wall. Wherein, in the first direction, the second box wall is closer to the first wall than the first box wall, and a cooling channel is arranged on the side of the second box wall away from the first wall.

[0058] The cooling channel provided in the second box wall is conducive to the condensation of steam in the discharge of the battery cell assembly and its adhesion to the second box wall, which can reduce the risk of steam condensing and adhering to the first wall and short-circuiting due to contact with the electrode terminal, thereby reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0059] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0061] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 200 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1 is provided inside the vehicle 200, and the battery device 1 may be provided at the bottom, head or tail of the vehicle 200. The battery device 1 may be used to power the vehicle 200. For example, the battery device 1 may be used as an operating power source for the vehicle 200, for the circuit system of the vehicle 200, for example, for the working power requirements during the startup, navigation and operation of the vehicle 200.

[0062] The vehicle 200 may further include a controller 210 and a motor 220 , wherein the controller 210 is used to control the battery device 1 to supply power to the motor 220 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 200 .

[0063] In some embodiments of the present application, the battery device 1 can not only serve as an operating power source for the vehicle 200 , but also serve as a driving power source for the vehicle 200 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200 .

[0064] The battery device 1 includes a battery cell assembly and a battery management system. The battery management system is electrically connected to the battery cell assembly and is used to manage the charging and discharging of the battery cell assembly.

[0065] Please refer to Figure 2 , Figure 2 An exploded view of a battery device provided in some embodiments of the present application. The battery device 1 may further include a box 20, in which the battery cell assembly 10 is accommodated. The box 20 is used to provide a storage space for the battery cell assembly 10, and the box 20 may adopt a variety of structures. In some embodiments, the box 20 may include a first sub-box 23 and a second sub-box 24, the first sub-box 23 and the second sub-box 24 cover each other, and the first sub-box 23 and the second sub-box 24 jointly define a storage space for accommodating the battery cell assembly 10. The first sub-box 23 may be a hollow structure with one end open, and the second sub-box 24 may be a plate-like structure, and the second sub-box 24 covers the open side of the first sub-box 23, so that the first sub-box 23 and the second sub-box 24 jointly define a storage space; the first sub-box 23 and the second sub-box 24 may also be hollow structures with one side open, and the open side of the first sub-box 23 covers the open side of the second sub-box 24.

[0066] In the battery device 1, there may be multiple battery cell assemblies 10, and the multiple battery cell assemblies 10 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cell assemblies 10 are both connected in series and in parallel. The multiple battery cell assemblies 10 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cell assemblies 10 is accommodated in the box 20; of course, the battery device 1 may also be a battery module formed by connecting multiple battery cell assemblies 10 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. The battery device 1 may also include other structures, for example, the battery device 1 may also include a busbar component for realizing electrical connection between the multiple battery cell assemblies 10.

[0067] The battery cell assembly 10 may include a plurality of battery cells, and the battery cells may be secondary batteries or primary batteries; the battery cells may also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited thereto.

[0068] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 11 includes a housing 114, an electrode assembly 115 and an electrode terminal 113. The housing 114 includes a shell 1141 and an end cap 1142. The shell 1141 has an opening, and the end cap 1142 closes the opening to isolate the internal environment of the battery cell 11 from the external environment.

[0069] The shell 1141 is a component used to cooperate with the end cap 1142 to form the internal environment of the battery cell 11, wherein the formed internal environment can be used to accommodate the electrode assembly 115, the electrolyte and other components. The shell 1141 and the end cap 1142 can be independent components. The shell 1141 can be of various shapes and sizes. Specifically, the shape of the shell 1141 can be determined according to the specific shape and size of the electrode assembly 115. The material of the shell 1141 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0070] The end cap 1142 refers to a component that covers the opening of the shell 1141 to isolate the internal environment of the battery cell 11 from the external environment. Without limitation, the shape of the end cap 1142 can be adapted to the shape of the shell 1141 to match the shell 1141. Optionally, the end cap 1142 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 1142 is not easily deformed when squeezed and collided, so that the battery cell 11 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 1142. The electrode terminal can be used to electrically connect to the electrode assembly 115 for outputting or inputting electrical energy of the battery cell 11. The material of the end cap 1142 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 1142, and the insulating structure may be used to isolate the electrical connection components in the housing 1141 from the end cap 1142 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0071] Please refer to Figure 2 and Figure 3 , and refer to Figure 4 , Figure 4 Schematic diagram of the internal structure of a battery device provided in some embodiments of the present application. The embodiment of the present application provides a battery device 1. The battery device 1 includes a battery cell assembly 10 and a box 20. The battery cell assembly 10 includes a battery cell 11, and the battery cell 11 includes a shell 114, a pressure relief mechanism 112 and an electrode terminal 113. The shell 114 has a first wall 111, and the pressure relief mechanism 112 and the electrode terminal 113 are arranged on the first wall 111. The box 20 includes a first sub-box 23 and a second sub-box 24 arranged along a first direction X, the first sub-box 23 includes a first box wall 21, and the second sub-box 24 includes a second box wall 22. The first box wall 21 and the second box wall 22 are arranged at intervals along the first direction X, the first direction X is parallel to the gravity direction, and the second box wall 22 is located below the first box wall 21. The battery cell assembly 10 is accommodated in the box 20, and the battery cell assembly 10 is located between the first box wall 21 and the second box wall 22, and is connected to the first box wall 21. A cooling channel 221 is disposed on a side of the second box wall 22 facing away from the first wall 111 .

[0072] In some embodiments, the battery device 1 may include a battery cell assembly 10 .

[0073] In some embodiments, the battery device 1 may include a plurality of battery cell assemblies 10 , and the plurality of battery cell assemblies 10 may be arranged along a width direction of the battery device 1 .

[0074] In some embodiments, the battery cell assembly 10 may include one battery cell 11 .

[0075] In some embodiments, the battery cell assembly 10 may include a plurality of battery cells 11 , and the plurality of battery cells 11 are arranged along a length direction of the battery device 1 .

[0076] In some embodiments, the first wall 111 of the battery cell 11 may be an end cover 1142 of the battery cell 11 .

[0077] In some embodiments, the first direction may be represented by a direction indicated by a letter X in the figure. The first direction X may be parallel to the gravity direction, that is, the first direction X may be a height direction of the battery device 1 .

[0078] In some embodiments, the first box wall 21 and the second box wall 22 are spaced apart along the first direction X, that is, the first box wall 21 can be arranged opposite to the second box wall 22, and the thickness direction of the first box wall 21 is parallel to the thickness direction of the second box wall 22. The thickness direction of the first box wall 21 and the thickness direction of the second box wall 22 may also have an angle, and the thickness direction of the first box wall 21 is not perpendicular to the thickness direction of the second box wall 22.

[0079] In some embodiments, the second box wall 22 is located below the first box wall 21 , that is, when the battery device 1 is installed in an electrical device, the second box wall 22 is located below the first box wall 21 .

[0080] In some embodiments, the battery cell assembly 10 is connected to the first box wall 21 , and the battery cell 11 is connected to the first box wall 21 by bonding.

[0081] In some embodiments, the pressure relief mechanism 112 and the electrode terminal 113 are disposed on the first wall 111. In the housing of the battery cell 11, the wall disposed opposite to the first wall 111 can be connected to the first box wall 21, so that in the first direction X, the second box wall 22 is closer to the first wall 111 than the first box wall 21, that is, the pressure relief mechanism 112 and the electrode terminal 113 are disposed downward. When the battery cell assembly 10 is depressurized, the discharge ejected by the pressure relief mechanism 112 is ejected downward.

[0082] In some embodiments, a cooling channel 221 is disposed on the side of the second wall 22 away from the first wall 111 to reduce the risk of interference between the cooling channel 221 and the battery cell assembly 10. The cooling channel 221 can be disposed on the second wall 22 by bolting, welding, bonding, etc.

[0083] In some embodiments, the cooling channel 221 may be disposed on a surface of the second box wall 22 facing the battery cell assembly 10 .

[0084] In some embodiments, the water cooling channel may be a water cooling plate or a water cooling pipe that is independent of the second box wall 22 .

[0085] When the battery cell assembly 10 is depressurized, the pressure relief mechanism 112 sprays high-temperature gas or liquid toward the second box wall 22. Since the second box wall 22 is provided with a cooling channel 221, the high-temperature gas or liquid forms a low-temperature liquid on the surface of the second box wall 22 facing the battery cell assembly 10, reducing the probability of the high-temperature gas or liquid forming a low-temperature liquid adhering to the first wall 111.

[0086] According to the technical solution of the embodiment of the present application, in the direction of gravity, the box body 20 includes a first box wall 21 and a second box wall 22 located below the first box wall 21. The battery cell assembly 10 is arranged on the first box wall 21, and the first wall 111 on which the electrode terminal 113 and the pressure relief mechanism 112 are arranged is closer to the second box wall 22, that is, the battery cell assembly 10 is inverted in the box body 20. Usually, the battery device 1 is arranged at the bottom of the electric device. When the battery cell assembly 10 of the present application is depressurized, the pressure relief mechanism 112 depressurizes downward, which can reduce the impact on the electric device. At the same time, a cooling flow channel 221 is arranged on the second box wall 22, which is conducive to the condensation of steam in the discharge ejected by the battery cell assembly 10 and adheres to the second box wall 22, which can reduce the risk of steam condensing and adhering to the first wall 111 and contacting the electrode terminal 113 to cause a short circuit, thereby reducing the risk of insulation failure of the battery device 1 and improving the reliability of the battery device 1.

[0087] Please refer to Figures 2 to 4 In some embodiments, in the first direction X, the second box wall 22 is spaced apart from the first wall 111 .

[0088] In some embodiments, in the first direction X, the second box wall 22 may not contact the first wall 111 .

[0089] In some embodiments, in the first direction X, the electrode terminal 113 on the first wall 111 may not contact the first wall 111 .

[0090] According to the technical solution of the embodiment of the present application, the second box wall 22 and the first wall 111 are spaced apart from each other, which can reduce the risk of condensed liquid attached to the second box wall 22 contacting the first wall 111 and causing insulation failure of the battery device 1, thereby facilitating improving the reliability of the battery device 1.

[0091] Please refer to Figures 2 to 4 In some embodiments, the second box wall 22 is arranged parallel to the first wall 111 .

[0092] In some embodiments, the thickness direction of the second box wall 22 may be parallel to the thickness direction of the first wall 111 , that is, in the first direction X, the distances between each region of the second box wall 22 and each region of the first wall 111 are equal.

[0093] In some embodiments, the extension direction of the second box wall 22 may be parallel to the horizontal direction.

[0094] In some embodiments, the extension direction of the second box wall 22 may intersect with the horizontal direction.

[0095] In some embodiments, there may be an angle between the thickness direction of the second box wall 22 and the thickness direction of the first wall 111 , that is, the extension direction of the second box wall 22 and the extension direction of the first wall 111 may intersect.

[0096] According to the technical solution of the embodiment of the present application, the thickness direction of the second box wall 22 is parallel to the thickness direction of the first wall 111, and the distance between the second box wall 22 and the first wall 111 in the first direction X can be set to be the same along the horizontal direction, thereby reducing the risk of insulation failure of the battery device 1 and improving the reliability of the battery device 1.

[0097] Please refer to Figures 2 to 4 In some embodiments, the second sub-box body 24 further includes a third box wall 25. In the first direction X, the third box wall 25 is arranged on a side of the second box wall 22 away from the first box wall 21, and the cooling channel 221 is arranged between the second box wall 22 and the third box wall 25.

[0098] In some embodiments, the second sub-box body 24 can be formed into a main body having a cavity 222 by stamping, integral molding, etc., the second box wall 22 and the third box wall 25 together form the cavity, and the cooling channel 221 is disposed in the cavity 222 .

[0099] In some embodiments, the cavity 222 may directly serve as a flow channel, thereby defining a cooling flow channel 221 .

[0100] In some embodiments, the cavity 222 may be a space for accommodating the cooling channel 221 , and the cooling channel 221 may be a water cooling plate, a water cooling pipe, or the like.

[0101] In some embodiments, there may be a plurality of cooling channels 221 , the plurality of cooling channels 221 are interconnected, and the plurality of cooling channels 221 are evenly distributed on the second box wall 22 .

[0102] In some embodiments, in the first direction X, the third box wall 25 may be the outermost box wall of the second sub-box body 24 , and is used to protect the cooling channel 221 .

[0103] In some embodiments, a filler may be provided between the second box wall 22 and the third box wall 25 . The filler may be foam or a metal piece. The filler is provided outside the cooling channel 221 to improve the structural strength of the second sub-box body 24 .

[0104] According to the technical solution of the embodiment of the present application, the cooling channel 221 is arranged between the second box wall 22 and the third box wall 25, that is, the third box wall 25 is arranged on the outside of the cooling channel 221, thereby reducing the risk of the cooling channel 221 being damaged.

[0105] Please refer to Figures 2 to 4 , and refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram of a box provided in some embodiments of the present application, Figure 6 for Figure 5 In some embodiments, in the first direction X, a surface of the second box wall 22 facing the first wall 111 is provided with a groove 223 .

[0106] In some embodiments, the groove 223 may be formed by being integrally formed with the second box wall 22 , or may be formed by machining after the second box wall 22 is machined.

[0107] In some embodiments, the number of the groove 223 may be one, and the groove 223 may be disposed at the center of the second box wall 22 .

[0108] In some embodiments, there may be a plurality of grooves 223 , and the plurality of grooves 223 are arranged at intervals and evenly distributed on the surface of the second box wall 22 facing the first wall 111 .

[0109] In some embodiments, an arc-shaped chamfer may be provided at a junction between the groove 223 and the surface of the second box wall 22 facing the first wall 111 , so that the condensed liquid can be collected in the groove 223 .

[0110] When the second box wall 22 cools the gas or liquid with a relatively high temperature ejected by the pressure relief to form a liquid with a relatively low temperature, the formed liquid can be collected in the groove 223 .

[0111] According to the technical solution of the embodiment of the present application, a groove 223 is provided on the surface of the second box wall 22 facing the first wall 111, and the condensed liquid formed after the discharge of the battery cell assembly 10 is condensed can be collected in the groove 223, thereby further reducing the risk of insulation failure of the battery device 1 caused by contact between the condensed liquid and the first wall 111, thereby improving the reliability of the battery device 1.

[0112] Please refer to Figures 4 to 6 In some embodiments, in the first direction X, the groove 223 corresponds to the pressure relief mechanism 112 .

[0113] In some embodiments, the number of the grooves 223 may be the same as the number of the pressure relief mechanisms 112. The battery cell assembly 10 may be provided with one pressure relief mechanism 112, and the second box wall 22 may also be provided with one groove 223. The battery cell assembly 10 may be provided with multiple pressure relief mechanisms 112, and the second box wall 22 may also be provided with multiple grooves 223. With the first direction X as the projection direction, the projection of the pressure relief mechanism 112 may completely fall into the groove 223, or the projection of the pressure relief mechanism 112 may partially fall into the groove 223.

[0114] In some embodiments, the number of the grooves 223 may be different from the number of the pressure relief mechanisms 112. The battery cell assembly 10 may be provided with a plurality of pressure relief mechanisms 112, and the second box wall 22 may be provided with a groove 223. With the first direction X as the projection direction, the projections of the plurality of pressure relief mechanisms 112 may completely fall into the groove 223.

[0115] Alternatively, the battery cell assembly 10 may be provided with a plurality of pressure relief mechanisms 112, and the second box wall 22 may be provided with a plurality of grooves 223, the number of which is less than the number of the pressure relief mechanisms 112. Taking the first direction X as the projection direction, the projections of several pressure relief mechanisms 112 may fall into one groove 223.

[0116] According to the technical solution of the embodiment of the present application, in the first direction X, the groove 223 corresponds to the pressure relief mechanism 112, so that the condensed liquid formed after the discharge of the battery cell assembly 10 is condensed can be better collected in the groove 223 under the action of gravity, thereby improving the confluence capacity of the groove 223, further reducing the risk of insulation failure of the battery device 1 caused by contact between the liquid and the first wall 111, and improving the reliability of the battery device 1.

[0117] Please refer to Figures 4 to 6 In some embodiments, the groove 223 has a groove bottom wall 2231 and a groove side wall 2232. The groove side wall 2232 is arranged around the outer periphery of the groove bottom wall 2231. In the first direction X, one end of the groove side wall 2232 is connected to the groove bottom wall 2231, and the other end extends to the surface of the second box wall 22 facing the first wall 111. In the first direction X, the projection of the groove bottom wall 2231 at least partially overlaps with the projection of the cooling channel 221.

[0118] In some embodiments, the thickness direction of the groove bottom wall 2231 may be parallel to the thickness direction of the second box wall 22 .

[0119] In some embodiments, the thickness direction of the groove bottom wall 2231 may intersect with the thickness direction of the second box wall 22 .

[0120] In some embodiments, with the first direction X as the projection direction, the projection of the groove bottom wall 2231 can completely cover the projection of the cooling channel 221 .

[0121] In some embodiments, with the first direction X as the projection direction, the projection of the groove bottom wall 2231 may cover a portion of the projection of the cooling channel 221 .

[0122] In some embodiments, the projection of the cooling channel 221 may cover a portion of the projection of the groove bottom wall 2231 .

[0123] In some embodiments, in the first direction X, at least a portion of the cooling channel 221 may correspond to the groove bottom wall 2231, and the groove bottom wall 2231 may correspond to the pressure relief mechanism 112 of the battery cell 11, so that during pressure relief, the ejected high-temperature gas or high-temperature liquid can contact the groove bottom wall 2231, so that the cooling channel 221 can be better cooled.

[0124] According to the technical solution of the embodiment of the present application, in the first direction X, the projection of the groove bottom wall 2231 covers the projection of the cooling channel 221, that is, the cooling channel 221 corresponds to the groove 223, which is beneficial for the condensation of steam in the exhaust to form condensed liquid, which can be better gathered in the groove 223, thereby improving the confluence capacity of the groove 223, further reducing the risk of insulation failure of the battery device 1 caused by contact between the liquid and the first wall 111, and improving the reliability of the battery device 1.

[0125] Please refer to Figure 5 In some embodiments, the battery device 1 further includes an adsorbent 30 , which is disposed in the box body 20 , and is used to adsorb liquid and vapor in the box body 20 .

[0126] In some embodiments, the adsorbent 30 may be a desiccant.

[0127] In some embodiments, the adsorption member 30 may be disposed on the first box wall 21 , the second box wall 22 , or other walls of the box body 20 .

[0128] In some embodiments, the adsorption member 30 may be disposed in the groove 223 .

[0129] According to the technical solution of the embodiment of the present application, an adsorbent 30 is arranged in the box body 20. The adsorbent 30 can absorb moisture in the air in the box body 20, further reducing the risk of insulation failure of the battery device 1 caused by contact between the liquid and the first wall 111, thereby improving the reliability of the battery device 1.

[0130] In some embodiments, the second sub-box 24 is made of a non-conductive material.

[0131] In some embodiments, the second sub-box 24 may be made of hard plastic.

[0132] In some embodiments, the second sub-box 24 may be made of metal, and the surface of the second sub-box 24 facing the battery cell assembly 10 may be provided with an insulating layer, and the insulating layer may be made of plastic, rubber, etc.

[0133] According to the technical solution of the embodiment of the present application, the second sub-box 24 is made of non-conductive material, that is, the material of the second box wall 22 is non-conductive material. The steam condenses on the second box wall 22 during pressure relief, thereby reducing the risk of the second box wall 22 being electrified, improving the insulation of the battery device 1, and improving the reliability of the battery device 1.

[0134] Please refer to Figure 7 , Figure 7 A schematic diagram of the internal structure of a battery device from another perspective provided in some embodiments of the present application. In some embodiments, there are multiple battery cells 11, and the multiple battery cells 11 are arranged along the second direction Y, and the second direction Y intersects with the first direction X. The battery device 1 includes an end plate 40, which is disposed at the end of the battery cell assembly 10 in the second direction Y.

[0135] In some embodiments, the second direction may be represented by the direction indicated by the letter Y in the figure.

[0136] In some embodiments, the second direction Y may be a length direction of the battery device 1 .

[0137] In some embodiments, the number of end plates 40 can be two, and the two end plates 40 are respectively arranged at both ends of the battery cell assembly 10 in the second direction Y, and are connected by binding parts to clamp multiple battery cells 11, thereby resisting the expansion force of the battery cell assembly 10 during charging and discharging.

[0138] According to the technical solution of the embodiment of the present application, the end plate 40 is arranged at the end of the battery cell assembly 10 in the second direction Y. The end plate 40 is used to resist the expansion force generated by the charging and discharging of the battery cell assembly 10, reduce the risk of damage to the battery cell assembly 10, and improve the reliability of the battery device 1.

[0139] Please refer to Figure 7 In some embodiments, the battery device 1 further includes a connector 50 and a busbar component 60. The connector 50 is disposed on the end plate 40. The busbar component 60 electrically connects the connector 50 and the electrode terminal 113. The connector 50 is used to connect the battery device 1 with an electrical device.

[0140] In some embodiments, the busbar component 60 may connect the electrode terminals 113 of a plurality of battery cells 11 in series or in parallel, thereby achieving busbar integration of the battery cell assembly 10 .

[0141] In some embodiments, the busbar component 60 is connected to the electrode terminal 113 , and the other end is connected to the connector 50 disposed on the end plate 40 , and the connector 50 is used to connect to an external electrical device.

[0142] In some embodiments, during discharge, the current of the battery cell assembly 10 passes through the busbar 60 and is transmitted to an external power-consuming device via the connector 50 .

[0143] In addition, the connector 50 can also realize charging of the battery device 1. During charging, the external current is transmitted to the electrode terminal 113 through the connector 50 and the busbar component 60, so as to realize charging of the battery cell assembly 10.

[0144] The connector 50 may be connected to an external terminal of the box 20 of the battery device 1 for connecting to an external electrical device.

[0145] In the technical solution of the embodiment of the present application, the converging component 60 realizes the electrical connection between the connector 50 and the electrode terminal 113, and realizes the electrical connection between the battery device 1 and the power-consuming device through the connector 50, so as to realize the charging and discharging of the battery device 1. At the same time, a cooling channel 221 is provided on the second box wall 22, and when the battery cell assembly 10 is depressurized, the steam in the box body 20 is condensed on the second box wall 22, so as to reduce the risk of the steam condensing and adhering to the first wall 111 and forming a short circuit with the electrode terminal 113, the converging component 60 and the connector 50, reduce the risk of insulation failure of the battery device 1, and improve the reliability of the battery device 1.

[0146] Please refer to Figure 4 In some embodiments, the first box wall 21 is provided with a heat exchange channel 211 , and the heat exchange channel 211 is used to adjust the temperature of the battery cell assembly 10 .

[0147] In some embodiments, the heat exchange channel 211 may be a water-cooling plate or a water-cooling pipe that is independent of the first box wall 21 , or may be directly formed inside the first box wall 21 .

[0148] In some embodiments, the heat exchange channel 211 may be disposed on the surface of the first box wall 21 facing the battery cell assembly 10 , or may be disposed inside the first box wall 21 .

[0149] According to the technical solution of the embodiment of the present application, the charge and discharge performance of the battery cell assembly 10 is affected by temperature. By setting a heat exchange channel 211 on the first box wall 21 to adjust the temperature of the battery cell assembly 10, the charge and discharge performance of the battery cell assembly 10 is improved, and the reliability of the battery device 1 is improved.

[0150] Please refer to Figure 8 , Figure 8This is a schematic diagram of an energy storage device provided in some embodiments of the present application. The embodiments of the present application also provide an energy storage device 100, including an energy storage box 110 and a battery device 1 of the above embodiment, the battery device 1 is arranged in the energy storage box 110, and the battery device 1 is used to store electrical energy and can provide electrical energy.

[0151] In some embodiments, the number of the battery device 1 may be one.

[0152] In some embodiments, there may be multiple battery devices 1 , and the multiple battery devices 1 may be arranged along the length direction, width direction, and height direction of the energy storage device 100 .

[0153] In some embodiments, the energy storage box 110 may be a container.

[0154] In some embodiments, the energy storage box 110 may be provided with an external interface, and the connector 50 of the battery device 1 is connected to the external interface to realize charging and discharging of the electrical device.

[0155] Please refer to Fig. 9 , Fig. 9 Schematic diagram of energy storage device provided by other embodiments of the present application. In some embodiments, there is an angle α between the thickness direction of the second box wall 22 and the gravity direction, which satisfies the condition: 0≤α≤60°.

[0156] In some embodiments, the battery device 1 is disposed in the energy storage box 110. The thickness direction of the second box wall 22 may be parallel to the gravity direction or may intersect with the gravity direction. That is, the battery device 1 may be placed horizontally in the energy storage box 110 or may be placed obliquely in the energy storage box 110.

[0157] In some embodiments, a bracket may be provided in the energy storage box 110, and the bracket is used to carry the battery device 1. When the bracket is arranged horizontally, the battery device 1 can be placed horizontally in the energy storage box 110. When the bracket is arranged tilted, the battery device 1 can be placed tilted in the energy storage box 110.

[0158] In some embodiments, the thickness direction of the second box wall 22 may have an angle α with the gravity direction, and α satisfies the condition: 0≤α≤60°. α may be any value among 0°, 10°, 20°, 30°, 40°, 50°, 60°, or any value between the two values.

[0159] According to the technical solution of the embodiment of the present application, there is an angle between the thickness direction of the second box wall 22 and the gravity direction, that is, the battery device 1 is tilted, and the tilt angle satisfies the above conditions, which is convenient for collecting the liquid generated by the condensation of steam during pressure relief, reduces the risk of insulation failure of the battery device 1, improves the reliability of the battery device 1, and thus improves the reliability of the energy storage device 100.

[0160] An embodiment of the present application further provides an electrical device, comprising the battery device 1 of any of the above embodiments, wherein the battery device 1 is used to provide electrical energy to the electrical device.

[0161] Please refer to Figures 2 to 6 In some embodiments, the battery device 1 includes a battery cell assembly 10 and a box 20. The battery cell assembly 10 includes a battery cell 11, and the battery cell 11 has an end cover 1142. The end cover 1142 is provided with a pressure relief mechanism 112 and an electrode terminal 113. The box 20 includes a first sub-box 23 and a second sub-box 24 arranged along a first direction X. The first sub-box 23 includes a first box wall 21, and the second sub-box 24 includes a second box wall 22. The first box wall 21 and the second box wall 22 are arranged at intervals along the first direction X. The first direction X is parallel to the direction of gravity. The second box wall 22 is located below the first box wall 21. The battery cell assembly 10 is accommodated in the box 20. The battery cell assembly 10 is located between the first box wall 21 and the second box wall 22, and is connected to the first box wall 21. The second box wall 22 is arranged at intervals from the end cover 1142. The second box wall 22 is made of a non-conductive material, and a cooling channel 221 is disposed on a side of the second box wall 22 away from the end cover 1142 .

[0162] In some embodiments, in the first direction X, a groove 223 is provided on the surface of the second box wall 22 facing the end cover 1142. In addition, in the first direction X, the groove 223 is provided corresponding to the pressure relief mechanism 112, and the projection of the cooling channel 221 partially overlaps with the projection of the wall surface of the groove 223.

[0163] In some embodiments, the second sub-box body 24 further includes a third box wall 25 . In the first direction X, the third box wall 25 is disposed on a side of the second box wall 22 away from the first box wall 21 , and the cooling channel 221 is disposed between the second box wall 22 and the third box wall 25 .

[0164] According to the technical solution of the embodiment of the present application, a cooling channel 221 is arranged inside the second box wall 22, which is beneficial for the steam in the exhaust discharged by the battery cell assembly 10 to condense and adhere to the second box wall 22, and can reduce the risk of the steam condensing and adhering to the end cover 1142 and contacting the electrode terminal 113 to short-circuit, thereby reducing the risk of insulation failure of the battery device 1. At the same time, the material of the second box wall 22 is set to a non-conductive material, which improves the insulation performance of the battery device 1 and improves the reliability of the battery device 1.

[0165] A groove 223 is provided on the surface of the second box wall 22 facing the end cover 1142, so that the condensed liquid formed after the discharge of the battery monomer assembly 10 is condensed can be better collected in the groove 223 under the action of gravity, thereby improving the convergence capacity of the groove 223. In addition, in the first direction X, the groove 223 is provided corresponding to the pressure relief mechanism 112, and the projection of the cooling channel 221 partially overlaps with the projection of the wall surface of the groove 223, thereby further improving the convergence capacity of the groove 223, improving the condensation effect of the cooling channel 221 on the discharge of the battery monomer assembly 10, further reducing the risk of insulation failure of the battery device 1 caused by the contact between the liquid and the first wall 111, and improving the reliability of the battery device 1.

[0166] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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: A battery cell assembly, comprising a battery cell, wherein the battery cell comprises a housing, a pressure relief mechanism and an electrode terminal, wherein the housing has a first wall, and the pressure relief mechanism and the electrode terminal are arranged on the first wall; A box body, comprising a first sub-box body and a second sub-box body arranged along a first direction, the first sub-box body comprising a first box wall, the second sub-box body comprising a second box wall, the first box wall and the second box wall being spaced apart along the first direction, the first direction being parallel to the direction of gravity, the second box wall being located below the first box wall, the battery monomer assembly being accommodated in the box body, the battery monomer assembly being located between the first box wall and the second box wall, and being connected to the first box wall; Wherein, in the first direction, the second box wall is closer to the first wall than the first box wall, and a cooling channel is provided on a side of the second box wall facing away from the first wall.

2. The battery device according to claim 1, characterized in that: In the first direction, the second box wall is spaced apart from the first wall.

3. The battery device according to claim 2, characterized in that: The second box wall is arranged parallel to the first wall.

4. The battery device according to claim 1, characterized in that: The second sub-box body further includes a third box wall. In the first direction, the third box wall is arranged on a side of the second box wall away from the first box wall. The cooling channel is arranged between the second box wall and the third box wall.

5. The battery device according to claim 1, characterized in that: In the first direction, a surface of the second box wall facing the first wall is provided with a groove.

6. The battery device according to claim 5, characterized in that: In the first direction, the groove corresponds to the pressure relief mechanism.

7. The battery device according to claim 5, characterized in that: The groove has a groove bottom wall and a groove side wall, the groove side wall is arranged around the outer periphery of the groove bottom wall, and in the first direction, one end of the groove side wall is connected to the groove bottom wall, and the other end extends to the surface of the second box wall facing the first wall; In the first direction, a projection of the groove bottom wall at least partially overlaps with a projection of the cooling channel.

8. The battery device according to claim 1, characterized in that: The battery device further comprises an adsorbent, which is disposed in the box and is used for adsorbing liquid or steam in the box.

9. The battery device according to claim 1, characterized in that: The second sub-box is made of non-conductive material.

10. The battery device according to claim 1, characterized in that: There are multiple battery cells, and the multiple battery cells are arranged along a second direction, and the second direction intersects with the first direction; The battery device includes an end plate disposed at an end of the battery cell assembly in the second direction.

11. The battery device according to claim 10, characterized in that: The battery device further comprises a connector and a busbar component, wherein the connector is arranged on the end plate, the busbar component electrically connects the connector and the electrode terminal, and the connector is used to connect the battery device with an electrical device.

12. The battery device according to claim 1, characterized in that: The first box wall is provided with a heat exchange channel, and the heat exchange channel is used to adjust the temperature of the battery monomer assembly.

13. An energy storage device, characterized in that: It comprises an energy storage box and a battery device as described in any one of claims 1 to 12, wherein the battery device is arranged in the energy storage box, and the battery device is used to store electrical energy and can provide electrical energy.

14. The energy storage device according to claim 13, characterized in that: An angle α is formed between the thickness direction of the second box wall and the gravity direction, satisfying the condition: 0≤α≤60°.

15. An electrical device, characterized in that: It comprises the battery device as described in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy to the electrical device.

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