Battery device, energy storage device and power consumption device

Abstract

An embodiment of the present application provides a battery device, an energy storage device, and an electrical device. The battery device includes a battery cell assembly and a box body. The battery cell assembly includes battery cells, and each 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 disposed on the first wall. The box body includes a first sub-box body and a second sub-box body arranged along a first direction. The first sub-box body includes a first box wall, and the second sub-box body includes a second box wall. The first box wall and the second box wall are spaced apart along the first direction. The second box wall is located below the first box wall. The battery cell assembly is accommodated in the box body, and 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 flow channel is provided on a side of the second box wall facing away from the first wall. The technical solution provided by the present application can improve the reliability of the battery device.

Description

Technical Field

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

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

[0003] In the development of battery device technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved in battery device technology. 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] The present application is implemented through the following technical solutions:

[0006] In a first aspect, the present application provides a battery device. The battery device includes a battery cell assembly and a box body. The battery cell assembly includes battery cells, and each battery cell includes a housing, a pressure relief mechanism, and electrode terminals. The housing has a first wall, and the pressure relief mechanism and the electrode terminals are disposed on the first wall. The box body includes a first sub-box body and a second sub-box body arranged along a first direction. The first sub-box body includes a first box wall, and the second sub-box body includes a second box wall. The first box wall and the second box wall are spaced apart 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 received in the box body, located between the first box wall and the second box wall, and 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 flow channel is provided on a side of the second box wall facing away from the first wall.

[0007] In 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 disposed on the first box wall, and the first wall provided with the electrode terminals and the pressure relief mechanism is closer to the second box wall, that is, the battery cell assembly is inverted in the box body. Usually, the battery device is disposed at the bottom of the electrical device. When the pressure relief mechanism of the battery cell assembly of the present application relieves pressure, the pressure relief mechanism relieves pressure downward, which can reduce the impact on the electrical device. At the same time, a cooling flow channel is provided on the second box wall, which is conducive to the condensation of steam in the emissions discharged by the battery cell assembly and the attachment to the second box wall, and can reduce the risk of the steam condensing and attaching to the first wall and contacting the electrode terminals to cause a short circuit, thereby reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0008] In some embodiments, in a first direction, the second box wall is spaced apart from the first wall.

[0009] In 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 that the condensed liquid attached to the second box wall contacts the first wall and causes the insulation failure of the battery device, and is convenient for improving the reliability of the battery device.

[0010] In some embodiments, the second box wall is arranged parallel to the first wall.

[0011] In 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 in the horizontal direction, reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0012] In some embodiments, the second sub-box body further includes a third box wall. In the first direction, the third box wall is arranged on the side of the second box wall away from the first box wall, and the cooling flow channel is arranged between the second box wall and the third box wall.

[0013] In the technical solution of the embodiment of the present application, the cooling flow channel is arranged between the second box wall and the third box wall, that is, the third box wall is arranged outside the cooling flow channel, reducing the risk of damage to the cooling flow channel.

[0014] In some embodiments, in the first direction, a groove is provided on the surface of the second box wall facing the first wall.

[0015] In 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 the condensed liquid formed after the emissions of the battery cell assembly are condensed can be collected in the groove, further reducing the risk that the condensed liquid contacts the first wall and causes the insulation failure of the battery device, and improving the reliability of the battery device.

[0016] In the technical solution of the embodiment of the present application, in the first direction, the groove corresponds to the pressure relief mechanism.

[0017] In 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 emissions discharged by the battery cell assembly are condensed can be better collected in the groove under the action of gravity, improving the ability of the groove to collect the flow, further reducing the risk that the liquid contacts the first wall and causes the insulation failure of the battery device, and improving the reliability of the battery device.

[0018] 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. 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, the projection of the groove bottom wall at least partially overlaps with the projection of the cooling flow channel.

[0019] In 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 flow channel, that is, the cooling flow channel corresponds to the groove, which is conducive to the condensed liquid formed by the condensation of the steam in the emissions being better collected in the groove, improving the groove confluence ability, further reducing the risk of insulation failure of the battery device caused by the liquid contacting the first wall, and improving the reliability of the battery device.

[0020] In some embodiments, the battery device further includes an adsorbent, which is disposed in the box body and is used for adsorbing the liquid and steam in the box body.

[0021] In the technical solution of the embodiment of the present application, an adsorbent is disposed in the box body, and the adsorbent can adsorb the moisture in the air in the box body, further reducing the risk of insulation failure of the battery device caused by the liquid contacting the first wall, and improving the reliability of the battery device.

[0022] In some embodiments, the material of the second sub-box body is a non-conductive material.

[0023] In the technical solution of the embodiment of the present application, the second sub-box body is made of a non-conductive material, that is, the material of the second box wall is also a non-conductive material. The steam during pressure relief condenses on the second box wall, 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.

[0024] 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 with the first direction. The battery device includes an end plate, and the end plate is disposed at the end of the battery cell assembly in the second direction.

[0025] In the technical solution of the embodiment of the present application, the end plate is disposed 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, reducing the risk of damage to the battery cell assembly, and improving the reliability of the battery device.

[0026] In some embodiments, the battery device further includes a connector and a busbar component. The connector is disposed on the end plate, and the busbar component is electrically connected to the connector and the electrode terminal, and the connector is used to connect the battery device to the electrical device.

[0027] In the technical solution of the embodiment of the present application, the busbar component realizes the electrical connection between the connector and the electrode terminal, and realizes the electrical connection between the battery device and the electrical device through the connector, realizing the charging and discharging of the battery device. At the same time, a cooling flow channel is provided on the second box wall to condense the steam in the box body on the second box wall when the battery cell assembly is depressurized, reducing the risk of the condensed steam adhering to the first wall and forming a short circuit with the electrode terminal, the busbar component, and the connector, reducing the risk of insulation failure of the battery device, and improving the reliability of the battery device.

[0028] In some embodiments, a heat exchange flow channel is provided on the first box wall, and the heat exchange flow channel is used to adjust the temperature of the battery cell assembly.

[0029] In 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 providing a heat exchange flow channel on the first box wall to adjust the temperature of the battery cell assembly, it is beneficial to improve the charge and discharge performance of the battery cell assembly and the reliability of the battery device.

[0030] In a second aspect, the present application further provides an energy storage device, including an energy storage box body and the battery device in any one of the embodiments of the first aspect. The battery device is disposed in the energy storage box body, and the battery device is used to store electrical energy and can provide electrical energy.

[0031] In some embodiments, there is an included angle α between the thickness direction of the second box wall and the gravity direction, satisfying the condition: 0 ≤ α ≤ 60°.

[0032] In the technical solution of the embodiment of the present application, there is an included angle between the thickness direction of the second box wall and the gravity direction, that is, the battery device is inclined, and the inclination angle satisfies the above conditions, which is convenient for collecting the liquid generated by the condensation of steam during pressure relief, reducing the risk of insulation failure of the battery device, improving the reliability of the battery device, and thus improving the reliability of the energy storage device.

[0033] In a third aspect, the present application further provides an electrical device, including the battery device in any one of the embodiments of the first aspect, and the battery device is used to provide electrical energy for the electrical device.

[0034] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0036] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application;

[0037] Figure 2 An exploded view of a battery device provided for some embodiments of the present application;

[0038] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0039] Figure 4Schematic diagram of the internal structure of the battery device provided by some embodiments of the present application;

[0040] Figure 5 Schematic diagram of the box body provided by some embodiments of the present application;

[0041] Figure 6 For Figure 5 Enlarged view of location A in

[0042] Figure 7 Schematic diagram of the internal structure of the battery device from another perspective provided by some embodiments of the present application;

[0043] Figure 8 Schematic diagram of the energy storage device provided by some embodiments of the present application;

[0044] Figure 9 Schematic diagram of the energy storage device provided by some other embodiments of the present application.

[0045] Icons: 1 - Battery device; 10 - Battery cell assembly; 11 - Battery cell; 111 - First wall; 112 - Pressure relief mechanism; 113 - Electrode terminal; 114 - Outer shell; 1141 - Housing; 1142 - End cover; 115 - Electrode assembly; 20 - Box body; 21 - First box wall; 211 - Heat exchange flow channel; 22 - Second box wall; 221 - Cooling flow channel; 222 - Cavity; 223 - Groove; 2231 - Bottom wall of the groove; 2232 - Side wall of the groove; 23 - First sub - box body; 24 - Second sub - box body; 25 - Third box wall; 30 - Adsorbent; 40 - End plate; 50 - Connector; 60 - Busbar component; 100 - Energy storage device; 110 - Energy storage box body; 200 - Vehicle; 210 - Controller; 220 - Motor; X - First direction; Y - Second direction. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; 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" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0048] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or the second direction can represent: A exists alone, A and the second direction exist simultaneously, and the second direction exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0051] The term "plurality" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0052] The battery device (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0053] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0054] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0055] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0056] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0057] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0058] As an example, the box body can 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.

[0059] As an example, the box body can be a part of the chassis structure of a 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.

[0060] In some embodiments, the energy storage device can include multiple battery devices. The energy storage device includes an energy storage box body, and at least one side of the energy storage box body is provided with a door. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0061] In the embodiments of the present application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and can continue to be used.

[0062] The battery cell can be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0063] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, with the change of environmental conditions and / or internal conditions of the battery, the reliability issue of the battery device is also one of the key considerations.

[0064] Currently, the battery cell assembly is disposed in a box body and carried on the first box wall to form a battery device. The battery device is usually disposed at the bottom of the electrical device. For example, the battery device is disposed at the bottom of a vehicle. When the battery device relieves pressure, it will eject 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, flame, etc.). In order to reduce the damage of the emissions from the battery device to the electrical device when relieving pressure, the pressure relief mechanism of the battery cell assembly is usually disposed downward.

[0065] However, the pressure relief mechanism and the electrode terminal are usually disposed on the same wall of the outer shell. When the pressure relief mechanism relieves pressure, there is a risk that the discharged emissions will adhere to the first box wall in the form of liquid after cooling, resulting in the liquid adhering to the electrode terminal, causing the electrode terminal to form a short circuit, resulting in the insulation failure of the battery device and affecting the reliability of the battery device.

[0066] Based on the above considerations, in order to solve the problem that the liquid adheres to the electrode terminal, resulting in the insulation failure of the battery device and affecting the reliability of the battery device, the embodiment of the present application provides a battery device. The battery device includes a battery cell assembly and a box body. The battery cell assembly includes a battery cell, and the battery cell includes an outer shell, a pressure relief mechanism, and an electrode terminal. The outer shell has a first wall, and the pressure relief mechanism and the electrode terminal are disposed on the first wall. The box body includes a first sub-box body and a second sub-box body disposed along a first direction. The first sub-box body includes a first box wall, and the second sub-box body includes a second box wall. The first box wall and the second box wall are spaced apart along the first direction, and the first direction is parallel to the gravity direction. The second box wall is located below the first box wall. The battery cell assembly is accommodated in the box body, and the battery cell assembly is located between the first box wall and the second box wall and 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 flow channel is disposed on the side of the second box wall facing away from the first wall.

[0067] The provision of the cooling flow channel on the second box wall is conducive to the condensation of the steam in the emissions discharged by the battery cell assembly and the adhesion to the second box wall, which can reduce the risk of the steam condensing and adhering to the first wall and contacting the electrode terminal to cause a short circuit, thereby reducing the risk of insulation failure of the battery device and improving the reliability of the battery device.

[0068] 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 battery-powered vehicles, electric toys, electric tools, vehicles, ships, and spacecrafts. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0069] For the convenience of description, the following embodiments take a vehicle, which is an electrical device in an embodiment of the present application, as an example for illustration.

[0070] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 200 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. A battery device 1 is disposed inside the vehicle 200. The battery device 1 can be disposed at the bottom, the head, or the tail of the vehicle 200. The battery device 1 can be used for power supply of the vehicle 200. For example, the battery device 1 can serve as an operating power source of the vehicle 200 and be used for the circuit system of the vehicle 200, such as for the working power demands during starting, navigation, and running of the vehicle 200.

[0071] The vehicle 200 may further include a controller 210 and a motor 220. The controller 210 is used to control the battery device 1 to supply power to the motor 220. For example, it is used for the working power demands during starting, navigation, and driving of the vehicle 200.

[0072] In some embodiments of the present application, the battery device 1 can not only serve as an operating power source of the vehicle 200, but also serve as a driving power source of the vehicle 200, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200.

[0073] 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 charge and discharge of the battery cell assembly.

[0074] Please refer to Figure 2 , Figure 2An exploded view of the battery device provided by some embodiments of the present application. The battery device 1 may further include a box body 20, and the battery cell assembly 10 is accommodated in the box body 20. Among them, the box body 20 is used to provide an accommodation space for the battery cell assembly 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first sub-box body 23 and a second sub-box body 24, the first sub-box body 23 and the second sub-box body 24 cover each other, and the first sub-box body 23 and the second sub-box body 24 jointly define an accommodation space for accommodating the battery cell assembly 10. The first sub-box body 23 may be a hollow structure with one end open, and the second sub-box body 24 may be a plate-like structure. The second sub-box body 24 covers the open side of the first sub-box body 23 so that the first sub-box body 23 and the second sub-box body 24 jointly define an accommodation space; the first sub-box body 23 and the second sub-box body 24 may also both be hollow structures with one side open, and the open side of the first sub-box body 23 covers the open side of the second sub-box body 24.

[0075] In the battery device 1, there may be multiple battery cell assemblies 10, and the multiple battery cell assemblies 10 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cell assemblies 10. The multiple battery cell assemblies 10 can be directly connected in series, parallel or in a mixed connection together, and then the whole formed by the multiple battery cell assemblies 10 is accommodated in the box body 20; of course, the battery device 1 can also be that multiple battery cell assemblies 10 are first connected in series, parallel or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, parallel or in a mixed connection to form a whole and are accommodated in the box body 20. The battery device 1 may further include other structures. For example, the battery device 1 may further include a busbar component for realizing the electrical connection among the multiple battery cell assemblies 10.

[0076] Among them, the battery cell assembly 10 may include multiple battery cells, and the battery cells can be secondary batteries or primary batteries; the battery cells can also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited thereto.

[0077] Please refer to Figure 3 , Figure 3 An exploded view of the battery cell provided by some embodiments of the present application. As Figure 3 shown, the battery cell 11 includes a housing 114, an electrode assembly 115 and an electrode terminal 113. The housing 114 includes a housing body 1141 and an end cap 1142. The housing body 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.

[0078] The housing 1141 is a component for cooperating with the end cap 1142 to form the internal environment of the battery cell 11. Among them, the formed internal environment can be used to accommodate the electrode assembly 115, the electrolyte, and other components. The housing 1141 and the end cap 1142 can be independent components. The housing 1141 can be of various shapes and sizes. Specifically, the shape of the housing 1141 can be determined according to the specific shape and size of the electrode assembly 115. The material of the housing 1141 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0079] The end cap 1142 refers to a component that covers the opening of the housing 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 housing 1141 to cooperate with the housing 1141. Optionally, the end cap 1142 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 1142 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 11 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap 1142. The electrode terminals can be used to electrically connect with the electrode assembly 115 for outputting or inputting the electrical energy of the battery cell 11. The material of the end cap 1142 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 1142. The insulating structure can be used to isolate the electrical connection components in the housing 1141 from the end cap 1142 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0080] Please refer to Figure 2 and Figure 3 and refer to Figure 4 Figure 4Schematic diagram of the internal structure of the battery device provided by some embodiments of the present application. Some embodiments of the present application provide a battery device 1. The battery device 1 includes a battery cell assembly 10 and a box body 20. The battery cell assembly 10 includes battery cells 11, and each battery cell 11 includes a housing 114, a pressure relief mechanism 112, and an electrode terminal 113. The housing 114 has a first wall 111, and the pressure relief mechanism 112 and the electrode terminal 113 are provided on the first wall 111. The box body 20 includes a first sub-box body 23 and a second sub-box body 24 arranged along a first direction X. The first sub-box body 23 includes a first box wall 21, and the second sub-box body 24 includes a second box wall 22. The first box wall 21 and the second box wall 22 are spaced apart 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 body 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. Wherein, a cooling flow channel 221 is provided on a side of the second box wall 22 facing away from the first wall 111.

[0081] In some embodiments, the battery device 1 may include one battery cell assembly 10.

[0082] 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 the width direction of the battery device 1.

[0083] In some embodiments, the battery cell assembly 10 may include one battery cell 11.

[0084] 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 the length direction of the battery device 1.

[0085] In some embodiments, the first wall 111 of the battery cell 11 may be an end cap 1142 of the battery cell 11.

[0086] In some embodiments, the first direction may be represented by the direction indicated by the letter X in the figure. The first direction X may be parallel to the direction of gravity, that is, the first direction X may be the height direction of the battery device 1.

[0087] 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 may be disposed 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. An included angle may also exist between the thickness direction of the first box wall 21 and the thickness direction of the second box wall 22, and the thickness direction of the first box wall 21 is not perpendicular to the thickness direction of the second box wall 22.

[0088] 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 the electrical device, the second box wall 22 is located below the first box wall 21.

[0089] 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 adhesion.

[0090] In some embodiments, the pressure relief mechanism 112 and the electrode terminal 113 are disposed on the first wall 111, inside the housing of the battery cell 11. The wall opposite to the first wall 111 can be connected to the first box wall 21, such 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 relieves pressure, the emissions ejected by the pressure relief mechanism 112 are ejected downward.

[0091] In some embodiments, a cooling flow channel 221 is disposed on the side of the second box wall 22 facing away from the first wall 111, reducing the risk of interference between the cooling flow channel 221 and the battery cell assembly 10. The cooling flow channel 221 can be disposed on the second box wall 22 by means of bolt fastening, welding, adhesion, etc.

[0092] In some embodiments, the cooling flow channel 221 can be disposed on the surface of the second box wall 22 facing the battery cell assembly 10.

[0093] In some embodiments, the water cooling flow channel can be a water cooling plate or a water cooling pipe independent of the second box wall 22.

[0094] When the battery cell assembly 10 relieves pressure, the pressure relief mechanism 112 ejects a gas or liquid at a higher temperature toward the second box wall 22. Since the second box wall 22 is provided with the cooling flow channel 221, the gas or liquid at a higher temperature forms a liquid at a lower temperature on the surface of the second box wall 22 facing the battery cell assembly 10, reducing the probability that the gas or liquid at a higher temperature forms a liquid at a lower temperature and adheres to the first wall 111.

[0095] In 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 disposed on the first box wall 21, and the first wall 111 provided with the electrode terminal 113 and the pressure relief mechanism 112 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 disposed at the bottom of the power-consuming device. When the battery cell assembly 10 of the present application is pressure-relieved, the pressure relief mechanism 112 relieves pressure downward, which can reduce the impact on the power-consuming device. At the same time, a cooling flow channel 221 is provided on the second box wall 22, which is conducive to the condensation of the steam in the emissions ejected from the battery cell assembly 10 and the adhesion to the second box wall 22, and can reduce the risk that the steam adheres to the first wall 111 after condensation and contacts 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.

[0096] Please refer to Figures 2 to 4 , in some embodiments, in the first direction X, the second box wall 22 and the first wall 111 are spaced apart.

[0097] In some embodiments, in the first direction X, the second box wall 22 and the first wall 111 may not be in contact.

[0098] In some embodiments, in the first direction X, the electrode terminal 113 on the first wall 111 may not be in contact with the first wall 111.

[0099] In the technical solution of the embodiment of the present application, the second box wall 22 and the first wall 111 are spaced apart, which can reduce the risk that the condensed liquid adhering to the second box wall 22 contacts the first wall 111 and causes insulation failure of the battery device 1, and is convenient for improving the reliability of the battery device 1.

[0100] Please refer to Figures 2 to 4 , in some embodiments, the second box wall 22 and the first wall 111 are arranged in parallel.

[0101] In some embodiments, the thickness direction of the second box wall 22 and the thickness direction of the first wall 111 may be parallel, that is, in the first direction X, the distances between the respective regions of the second box wall 22 and the respective regions of the first wall 111 are equal.

[0102] In some embodiments, the extending direction of the second box wall 22 may be parallel to the horizontal direction.

[0103] In some embodiments, the extending direction of the second box wall 22 may intersect the horizontal direction.

[0104] In some embodiments, the thickness direction of the second box wall 22 and the thickness direction of the first wall 111 may form an angle, that is, the extending direction of the second box wall 22 and the extending direction of the first wall 111 may intersect.

[0105] In 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 in the horizontal direction, reducing the risk of insulation failure of the battery device 1 and improving the reliability of the battery device 1.

[0106] 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 disposed on a side of the second box wall 22 away from the first box wall 21, and the cooling flow channel 221 is disposed between the second box wall 22 and the third box wall 25.

[0107] 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 flow channel 221 is disposed in the cavity 222.

[0108] In some embodiments, the cavity 222 can directly serve as a flow channel, thereby defining the cooling flow channel 221.

[0109] In some embodiments, the cavity 222 can be a space for accommodating the cooling flow channel 221, and the cooling flow channel 221 can be a water-cooled plate, a water-cooled pipe, etc.

[0110] In some embodiments, the number of the cooling flow channels 221 can be multiple, the multiple cooling flow channels 221 communicate with each other, and the multiple cooling flow channels 221 are uniformly distributed on the second box wall 22.

[0111] In some embodiments, in the first direction X, the third box wall 25 can be the outermost box wall of the second sub-box body 24 for protecting the cooling flow channel 221.

[0112] In some embodiments, a filler can be disposed between the second box wall 22 and the third box wall 25. The filler can be foam or a metal part. The filler is disposed outside the cooling flow channel 221 for improving the structural strength of the second sub-box body 24.

[0113] In the technical solution of the embodiment of the present application, the cooling flow channel 221 is disposed between the second box wall 22 and the third box wall 25, that is, the third box wall 25 is disposed outside the cooling flow channel 221, reducing the risk of damage to the cooling flow channel 221.

[0114] Please refer to Figures 2 to 4 and refer to Figure 5 and Figure 6 , Figure 5 is a schematic diagram of a box body provided in some embodiments of the present application, Figure 6 is Figure 5Enlarged view of area A in []. In some embodiments, on the surface of the second box wall 22 facing the first wall 111 in the first direction X, there is a groove 223.

[0115] In some embodiments, the groove 223 can be integrally formed with the second box wall 22, or can be formed by machining after the second box wall 22 is processed.

[0116] In some embodiments, the number of the grooves 223 can be one, and the groove 223 can be arranged at the central position of the second box wall 22.

[0117] In some embodiments, the number of the grooves 223 can be multiple, and the multiple grooves 223 are arranged at intervals and evenly distributed on the surface of the second box wall 22 facing the first wall 111.

[0118] In some embodiments, an arc chamfer can be provided at the junction of the groove 223 and the surface of the second box wall 22 facing the first wall 111, so as to facilitate the condensed liquid to gather in the groove 223.

[0119] After the second box wall 22 cools the gas or liquid with a higher temperature ejected by pressure relief to form a liquid with a lower temperature, the formed liquid can gather in the groove 223.

[0120] In the technical solution of the embodiment of the present application, the surface of the second box wall 22 facing the first wall 111 is provided with a groove 223, and the condensed liquid formed after the emissions of the battery cell assembly 10 are condensed can gather in the groove 223, further reducing the risk of insulation failure of the battery device 1 caused by the condensed liquid contacting the first wall 111 and improving the reliability of the battery device 1.

[0121] 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.

[0122] In some embodiments, the number of the grooves 223 can be the same as the number of the pressure relief mechanisms 112. The battery cell assembly 10 can be provided with one pressure relief mechanism 112, and the second box wall 22 can also be provided with one groove 223. The battery cell assembly 10 can be provided with multiple pressure relief mechanisms 112, and the second box wall 22 can also be provided with multiple grooves 223. Taking the first direction X as the projection direction, the projection of the pressure relief mechanism 112 can completely fall into the groove 223, or the projection of the pressure relief mechanism 112 can partially fall into the groove 223.

[0123] 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 one 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.

[0124] 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, and the number of the grooves 223 is less than the number of the pressure relief mechanisms 112. With the first direction X as the projection direction, the projections of several pressure relief mechanisms 112 may fall into one groove 223.

[0125] In 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 emissions discharged from the battery cell assembly 10 are condensed can better converge in the groove 223 under the action of gravity, improving the converging ability of the groove 223, further reducing the risk of insulation failure of the battery device 1 caused by the liquid contacting the first wall 111, and improving the reliability of the battery device 1.

[0126] 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 and the projection of the cooling flow channel 221 at least partially overlap.

[0127] 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.

[0128] In some embodiments, the thickness direction of the groove bottom wall 2231 may intersect with the thickness direction of the second box wall 22.

[0129] In some embodiments, with the first direction X as the projection direction, the projection of the groove bottom wall 2231 may completely cover the projection of the cooling flow channel 221.

[0130] In some embodiments, with the first direction X as the projection direction, the projection of the groove bottom wall 2231 may cover a part of the projection of the cooling flow channel 221.

[0131] In some embodiments, the projection of the cooling flow channel 221 may cover a part of the projection of the groove bottom wall 2231.

[0132] In some embodiments, in the first direction X, at least a portion of the cooling channel 221 may correspond to the bottom wall 2231 of the groove, and the bottom wall 2231 of the groove may correspond to the pressure relief mechanism 112 of the battery cell 11. When pressure is relieved, the ejected high-temperature gas or high-temperature liquid can contact the bottom wall 2231 of the groove, enabling the cooling channel 221 to achieve cooling better.

[0133] In the technical solution of the embodiment of the present application, in the first direction X, the projection of the bottom wall 2231 covers the projection of the cooling channel 221, that is, the cooling channel 221 corresponds to the groove 223, which is conducive to the steam in the emissions condensing to form a condensate liquid and being better collected in the groove 223, improving the confluence ability of the groove 223, further reducing the risk of the liquid contacting the first wall 111 and causing insulation failure of the battery device 1, and improving the reliability of the battery device 1.

[0134] Please refer to Figure 5 , in some embodiments, the battery device 1 further includes an adsorbent 30, and the adsorbent 30 is disposed in the box body 20 and is used to adsorb the liquid and steam in the box body 20.

[0135] In some embodiments, the adsorbent 30 can be a desiccant.

[0136] In some embodiments, the adsorbent 30 can be disposed on the first box wall 21, the second box wall 22 or other walls of the box body 20.

[0137] In some embodiments, the adsorbent 30 can be disposed in the groove 223.

[0138] In the technical solution of the embodiment of the present application, the adsorbent 30 is disposed in the box body 20, and the adsorbent 30 can adsorb the moisture in the air in the box body 20, further reducing the risk of the liquid contacting the first wall 111 and causing insulation failure of the battery device 1, and improving the reliability of the battery device 1.

[0139] In some embodiments, the material of the second sub-box body 24 is a non-conductive material.

[0140] In some embodiments, the material of the second sub-box body 24 can be a rigid plastic.

[0141] In some embodiments, the material of the second sub-box body 24 can be a metal, and an insulating layer can be disposed on the surface of the second sub-box body 24 facing the battery cell assembly 10, and the material of the insulating layer is plastic, rubber, etc.

[0142] In the technical solution of the embodiment of the present application, the second sub-box body 24 is made of a non-conductive material, that is, the material of the second box wall 22 is a non-conductive material. When the steam during pressure relief condenses on the second box wall 22, the risk of the second box wall 22 being electrified is reduced, the insulation of the battery device 1 is improved, and the reliability of the battery device 1 is improved.

[0143] Please refer to Figure 7 , Figure 7 which is a schematic diagram of the internal structure of the battery device provided for some embodiments of the present application from another perspective. In some embodiments, the number of battery cells 11 is multiple, 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 end plates 40, and the end plates 40 are arranged at the ends of the battery cell assembly 10 in the second direction Y.

[0144] In some embodiments, the second direction can be represented by the direction indicated by the letter Y in the figure.

[0145] In some embodiments, the second direction Y can be the length direction of the battery device 1.

[0146] 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 a binding member to clamp the multiple battery cells 11, so as to resist the expansion force of the battery cell assembly 10 during charge and discharge.

[0147] According to the technical solution of the embodiments of the present application, the end plates 40 are arranged at the ends of the battery cell assembly 10 in the second direction Y. The end plates 40 are used to resist the expansion force generated by the charge and discharge 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.

[0148] Please refer to Figure 7 , in some embodiments, the battery device 1 further includes a connector 50 and a current collecting member 60. The connector 50 is arranged on the end plate 40, and the current collecting member 60 is electrically connected to the connector 50 and the electrode terminal 113. The connector 50 is used to connect the battery device 1 to an electrical device.

[0149] In some embodiments, the current collecting member 60 can connect the electrode terminals 113 of the multiple battery cells 11 in series or in parallel, so as to realize the current collection of the battery cell assembly 10.

[0150] In some embodiments, one end of the current collecting member 60 is connected to the electrode terminal 113, and the other end is connected to the connector 50 arranged on the end plate 40. The connector 50 is used to connect to an external electrical device.

[0151] In some embodiments, during discharge, the current of the battery cell assembly 10 passes through the current collecting member 60 and is transmitted to an external electrical device through the connector 50.

[0152] In addition, the connector 50 can also realize the charging of the battery device 1. During charging, the external current passes through the connector 50 and is transmitted to the electrode terminal 113 through the current collecting member 60 to realize the charging of the battery cell assembly 10.

[0153] Among them, the connector 50 can be connected to the external connection end of the box body 20 of the battery device 1 for connection to an external electrical device.

[0154] In the technical solution of the embodiment of the present application, the busbar 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 electrical device through the connector 50, so as to realize the charge and discharge of the battery device 1. At the same time, a cooling flow channel 221 is provided on the second box wall 22, and when the battery cell assembly 10 relieves pressure, the steam in the box body 20 is condensed on the second box wall 22, reducing the risk that the condensed steam adheres to the first wall 111 and forms a short circuit with the electrode terminal 113, the busbar component 60 and the connector 50, reducing the risk of insulation failure of the battery device 1, and improving the reliability of the battery device 1.

[0155] Please refer to Figure 4 , in some embodiments, a heat exchange flow channel 211 is provided on the first box wall 21, and the heat exchange flow channel 211 is used to adjust the temperature of the battery cell assembly 10.

[0156] In some embodiments, the heat exchange flow channel 211 can be a water-cooled plate or a water-cooled pipe independent of the first box wall 21, or can be directly formed inside the first box wall 21.

[0157] In some embodiments, the heat exchange flow channel 211 can be provided on the surface of the first box wall 21 facing the battery cell assembly 10, or can be provided inside the first box wall 21.

[0158] In 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 providing the heat exchange flow channel 211 on the first box wall 21 to adjust the temperature of the battery cell assembly 10, it is beneficial to improve the charge and discharge performance of the battery cell assembly 10 and beneficial to improve the reliability of the battery device 1.

[0159] Please refer to Figure 8 , Figure 8 is a schematic diagram of an energy storage device provided in some embodiments of the present application. The embodiment of the present application also provides an energy storage device 100, including an energy storage box body 110 and the battery device 1 of the above embodiment. The battery device 1 is arranged in the energy storage box body 110, and the battery device 1 is used for storing electric energy and capable of providing electric energy.

[0160] In some embodiments, the number of the battery devices 1 can be one.

[0161] In some embodiments, the number of the battery devices 1 can be multiple, and the multiple battery devices 1 can be arranged along the length direction, width direction, and height direction of the energy storage device 100.

[0162] In some embodiments, the energy storage box body 110 can be a container.

[0163] In some embodiments, the energy storage box body 110 can be provided with an external interface, and the connector 50 of the battery device 1 is connected to the external interface to realize the charging and discharging of the electrical device.

[0164] Please refer to Figure 9 , Figure 9 , which is a schematic diagram of the energy storage device provided in some other embodiments of the present application. In some embodiments, there is an included angle α between the thickness direction of the second box wall 22 and the gravity direction, satisfying the condition: 0 ≤ α ≤ 60°.

[0165] In some embodiments, the battery device 1 is disposed inside the energy storage box body 110. Among them, the thickness direction of the second box wall 22 can be parallel to the gravity direction or intersect with the gravity direction. That is to say, the battery device 1 can be horizontally placed inside the energy storage box body 110 or inclinedly placed inside the energy storage box body 110.

[0166] In some embodiments, a bracket can be provided inside the energy storage box body 110, and the bracket is used to carry the battery device 1. When the bracket is horizontally arranged, the battery device 1 can be horizontally placed inside the energy storage box body 110. When the bracket is inclinedly arranged, the battery device 1 can be inclinedly placed inside the energy storage box body 110.

[0167] In some embodiments, there can be an included angle α between the thickness direction of the second box wall 22 and the gravity direction, and α satisfies the condition: 0 ≤ α ≤ 60°. Among them, α can be any value among 0°, 10°, 20°, 30°, 40°, 50°, 60° or a value between any two of them.

[0168] In the technical solution of the embodiment of the present application, there is an included angle between the thickness direction of the second box wall 22 and the gravity direction, that is, the battery device 1 is inclinedly arranged, and the inclination 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.

[0169] The embodiment of the present application also provides an electrical device, including the battery device 1 in any of the above embodiments, and the battery device 1 is used to provide electrical energy for the electrical device.

[0170] Please refer to Figures 2 to 6, in some embodiments, the battery device 1 includes a battery cell assembly 10 and a box body 20. The battery cell assembly 10 includes battery cells 11, and each battery cell 11 has an end cap 1142, on which a pressure relief mechanism 112 and electrode terminals 113 are provided. The box body 20 includes a first sub-box body 23 and a second sub-box body 24 arranged along a first direction X. The first sub-box body 23 includes a first box wall 21, and the second sub-box body 24 includes a second box wall 22. The first box wall 21 and the second box wall 22 are spaced apart 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 received in the box body 20, located between the first box wall 21 and the second box wall 22, and connected to the first box wall 21. The second box wall 22 is spaced apart from the end cap 1142. Wherein, the material of the second box wall 22 is a non-conductive material, and a cooling channel 221 is provided on a side of the second box wall 22 facing away from the end cap 1142.

[0171] In some embodiments, on the first direction X, a groove 223 is provided on a surface of the second box wall 22 facing the end cap 1142. And, on the first direction X, the groove 223 is correspondingly arranged with the pressure relief mechanism 112, and a projection of the cooling channel 221 overlaps a part of a projection of a wall surface of the groove 223.

[0172] In some embodiments, the second sub-box body 24 further includes a third box wall 25. On the first direction X, the third box wall 25 is arranged on a side of the second box wall 22 facing away from the first box wall 21, and the cooling channel 221 is provided between the second box wall 22 and the third box wall 25.

[0173] The technical solution of the embodiment of the present application provides the cooling channel 221 inside the second box wall 22, which is conducive to the steam in the emissions discharged by the battery cell assembly 10 to condense and adhere to the second box wall 22, and can reduce the risk that the steam adheres to the end cap 1142 and contacts the electrode terminals 113 to cause a short circuit after condensation, 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 as a non-conductive material, which improves the insulation performance of the battery device 1 and the reliability of the battery device 1.

[0174] A groove 223 is provided on the surface of the second cell wall 22 facing the end cover 1142, so that the condensed liquid formed after the emissions discharged by the battery cell assembly 10 are condensed can better converge in the groove 223 under the action of gravity, improving the converging ability of the groove 223. Moreover, in the first direction X, the groove 223 is correspondingly arranged with the pressure relief mechanism 112, and the projection of the cooling flow channel 221 overlaps with the projection of the wall surface of the groove 223, further improving the converging ability of the groove 223, improving the condensation effect of the emissions discharged by the battery cell assembly 10 by the cooling flow channel 221, further reducing the risk of insulation failure of the battery device 1 caused by the liquid contacting the first wall 111, and improving the reliability of the battery device 1.

[0175] Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. 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, the second box wall is spaced apart from the first 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: The second box wall is arranged parallel to the first wall.

3. 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.

4. 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.

5. The battery device according to claim 4, characterized in that: In the first direction, the groove corresponds to the pressure relief mechanism.

6. The battery device according to claim 4, 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.

7. 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.

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

9. 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.

10. The battery device according to claim 9, 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.

11. 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.

12. 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 11, 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.

13. The energy storage device according to claim 12, 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°.

14. An electrical device, characterized in that: It comprises a battery device as described in any one of claims 1 to 11, wherein the battery device is used to provide electrical energy to the electrical device.

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