Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a first battery monomer assembly and a box body, the box body is provided with a first accommodating space for accommodating the first battery monomer assembly, the box body comprises a first wall, a second wall and two third walls, the second wall, the first battery monomer assembly and the first wall are sequentially distributed in the gravity direction, the first wall supports the first battery monomer assembly, and the two third walls are oppositely arranged in the first direction; the first battery cell assembly is disposed between the two third walls, and the first direction is perpendicular to the gravity direction. Wherein the second wall is provided with a first surface facing the first battery monomer assembly, in the first direction, the distance between the first surface and the first wall in the gravity direction is firstly increased and then decreased, and two ends of the first surface are respectively connected with the two third walls. 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 and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial 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. Utility Model Content

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

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery device, comprising a first battery cell assembly and a housing. The housing has a first accommodating space for accommodating the first battery cell assembly. The housing includes a first wall, a second wall, and two third walls. The second wall, the first battery cell assembly, and the first wall are sequentially arranged along the direction of gravity. The first wall supports the first battery cell assembly. The two third walls are arranged relative to each other along a first direction. The first battery cell assembly is arranged between the two third walls. The first direction is perpendicular to the direction of gravity. The second wall has a first surface facing the first battery cell assembly. Along the first direction, the distance between the first surface and the first wall in the direction of gravity first increases and then decreases. The two ends of the first surface are respectively connected to the two third walls.

[0007] The technical solution of the embodiment of the present application is that in the first direction, the distance between the first surface and the first wall in the direction of gravity first increases and then decreases, and the two ends of the first surface are respectively connected to two third walls, that is, the height of the first surface in the direction of gravity is higher in the middle and lower on both sides. The liquid (such as condensed water or other liquid) attached to the first surface can be diverted to the third wall, so that the liquid is guided to the first wall via the third wall, which is beneficial to reducing the risk of the liquid attached to the first surface dripping onto the first battery cell assembly, thereby causing the insulation failure of the first battery cell assembly, thereby reducing the risk of short circuit of the first battery cell assembly, and improving the reliability of the battery device.

[0008] In some embodiments, on a projection plane perpendicular to the second direction, the orthographic projection of the first surface is an arc, and the first direction, the second direction, and the direction of gravity are perpendicular to each other.

[0009] The technical solution of the embodiment of the present application takes the second direction as the projection direction and the positive projection of the first surface as an arc, which enables the liquid on the first surface to flow to the two ends of the first surface in the first direction under the action of gravity, thereby reducing the risk of the liquid on the first surface dripping onto the first battery cell assembly and causing insulation failure of the first battery cell assembly, reducing the risk of short circuit of the first battery cell assembly, and helping to improve the reliability of the battery device.

[0010] In some embodiments, in the direction of gravity, a height difference between the highest point of the first surface and the lowest point of the first surface is h, which satisfies: 2 mm ≤ h ≤ 30 mm.

[0011] According to the technical solution of the embodiment of the present application, in the direction of gravity, the height difference between the highest point of the first surface and the lowest point of the first surface meets the above conditions. For example, when h ≥ 2 mm, the height difference between the highest point of the first surface and the lowest point of the first surface is large, which enables the liquid on the first surface to flow better to the two ends of the first surface in the first direction under the action of gravity, thereby reducing the risk of short circuit of the first battery cell assembly and helping to improve the reliability of the battery device; when h ≤ 30 mm, the height difference between the highest point of the first surface and the lowest point of the first surface is small, and the descent of the first surface from the highest point to the lowest point is small. When the size of the box in the direction of gravity remains unchanged, the risk of interference between the first surface and the first battery cell assembly can be reduced.

[0012] In some embodiments, 5 mm ≤ h ≤ 10 mm.

[0013] According to the technical solution of the embodiment of the present application, in the direction of gravity, the height difference between the highest point of the first surface and the lowest point of the first surface meets the above conditions, which can further reduce the risk of short circuit of the first battery cell assembly, and at the same time can further reduce the risk of interference between the first surface and the first battery cell assembly, which is beneficial to improving the reliability of the battery device.

[0014] In some embodiments, the first wall has a second surface facing the first battery cell assembly. The second surface includes a first region and a second region. On a projection plane perpendicular to the direction of gravity, the orthographic projection of the first region overlaps with the orthographic projection of the first battery cell assembly, while the orthographic projection of the second region does not overlap with the orthographic projection of the first battery cell assembly. One end of the third wall in the direction of gravity is connected to the second region. The second region is provided with a groove for collecting condensed water.

[0015] The technical solution of the embodiment of the present application takes the direction of gravity as the projection direction, the orthographic projection of the second area does not overlap with the orthographic projection of the first battery cell assembly, and a groove for collecting condensed water or other liquids is provided in the second area, which can reduce the risk of liquid on the first surface dripping to the second surface and contacting the first battery cell assembly, thereby reducing the risk of short circuit of the first battery cell assembly and helping to improve the reliability of the battery device.

[0016] In some embodiments, the groove is spaced apart from the first battery cell assembly.

[0017] According to the technical solution of the embodiment of the present application, the groove portion is spaced apart from the first battery cell assembly, which can reduce the risk of condensed water or other liquids collected in the groove portion coming into contact with the first battery cell assembly, thereby reducing the risk of short circuit in the first battery cell assembly and improving the reliability of the battery device.

[0018] In some embodiments, in the direction of gravity, the depth of the groove is D, which satisfies: 3 mm ≤ D ≤ 10 mm.

[0019] According to the technical solution of the embodiment of the present application, the depth of the groove portion meets the above-mentioned conditions in the direction of gravity, which can reduce the risk of condensed water or other liquids collected in the groove portion and overflowing from the groove portion and contacting the first battery cell assembly, thereby reducing the risk of short circuit of the first battery cell assembly; at the same time, it can reduce the risk of the groove portion being set on the first wall and affecting the structural strength of the first wall.

[0020] In some embodiments, 3 mm ≤ D ≤ 6 mm.

[0021] According to the technical solution of the embodiment of the present application, the depth of the groove in the direction of gravity meets the above conditions, which can further reduce the risk of condensed water contacting the first battery cell assembly and causing a short circuit in the first battery cell assembly. At the same time, it can further reduce the risk of the groove affecting the structural strength of the first wall.

[0022] In some embodiments, the groove portion includes a first groove section and a second groove section arranged along the direction of gravity, one end of the first groove section extends to the second surface, and the other end is connected to the second groove section, wherein the width of the first groove section is smaller than the width of the second groove section.

[0023] According to the technical solution of the embodiment of the present application, the first groove section and the second groove section are connected and the first groove section extends to the second surface. The width of the first groove section is smaller than the width of the second groove section, so that when the liquid on the first surface is collected in the groove portion, the first groove section can prevent the liquid in the second groove section from splashing out, thereby reducing the risk of condensed water or other liquids contacting the first battery cell assembly and causing a short circuit in the first battery cell assembly, which is beneficial to improving the reliability of the battery device.

[0024] In some embodiments, the battery device is further provided with an adsorption member, which is disposed in the box body and is used to adsorb condensed water in the box body.

[0025] According to the technical solution of the embodiment of the present application, the adsorbent has good water absorption and can absorb the liquid in the box, thereby reducing the risk of condensed water or other liquids coming into contact with the first battery cell assembly and causing a short circuit in the first battery cell assembly, which is beneficial to improving the reliability of the battery device.

[0026] In some embodiments, the battery device further includes a second battery cell assembly, a second wall is disposed between the second battery cell assembly and the first battery cell assembly, the second wall supporting the second battery cell assembly, and a first heat exchange channel is formed within the second wall for accommodating a heat exchange medium.

[0027] In the technical solution of the embodiment of this application, the first and second battery cell assemblies are arranged along the direction of gravity and are housed within the same housing. This allows for better space utilization in the battery assembly, thereby increasing the energy density of the battery assembly. Furthermore, a first heat exchange channel is provided on the second wall supporting the second battery cell assembly. This allows the heat exchange medium in the first heat exchange channel to regulate the temperature of the second battery cell assembly, thereby reducing the impact of temperature on the charge and discharge performance of the second battery cell assembly.

[0028] In some embodiments, a second heat exchange channel is formed inside the first wall, and the second heat exchange channel is used to accommodate a heat exchange medium.

[0029] The technical solution of the embodiment of the present application is to set a second heat exchange channel on the first wall supporting the first battery cell assembly, so that the heat exchange medium in the second heat exchange channel can regulate the temperature of the first battery cell assembly, thereby reducing the impact of temperature on the charging and discharging performance of the first battery cell assembly.

[0030] In some embodiments, the first surface is provided with a waterproof layer.

[0031] According to the technical solution of the embodiment of the present application, the waterproof layer has good hydrophobicity, and the waterproof layer is provided on the first surface, so that the condensed water or other liquid on the first surface can better move on the first surface under the action of gravity, so that the condensed water or other liquid can better move to the two ends of the first surface in the first direction, thereby reducing the risk of the condensed water or other liquid contacting the first battery cell assembly and causing a short circuit of the first battery cell assembly, which is beneficial to improving the reliability of the battery device.

[0032] In some embodiments, the housing includes a first sub-housing and a second sub-housing, the first sub-housing and the second sub-housing being arranged opposite each other in the direction of gravity and interlocked. The battery device also includes a second battery cell assembly and a bracket. The first sub-housing and the bracket define a first storage space, in which the first battery cell assembly is housed. The second sub-housing and the bracket define a second storage space, in which the second battery cell assembly is housed. The bracket serves as a second wall.

[0033] According to the technical solution of the embodiment of the present application, the first sub-box and the second wall form a first accommodation space to accommodate the first battery cell assembly, and the second sub-box and the second wall form a second accommodation space to accommodate the second battery cell assembly, so that the first battery cell assembly and the second battery cell assembly can be stacked along the direction of gravity, thereby reducing the risk of interference between the first battery cell assembly and the second battery cell assembly, and improving the reliability of the battery device.

[0034] In some embodiments, the box includes a bottom wall and a top wall arranged opposite to each other in the direction of gravity, two first side walls arranged opposite to each other in a first direction, two second side walls arranged opposite to each other in the first direction, and two third side walls arranged opposite to each other in a second direction. The two first side walls are arranged at both ends of the bottom wall in the first direction to form a first sub-box, and the two second side walls are arranged at both ends of the top wall in the first direction to form a second sub-box. The first sub-box and the second sub-box are buckled together and form openings at both ends in the second direction, and the two third side walls respectively close the two openings.

[0035] The technical solution of the embodiment of the present application provides a third side wall to facilitate the installation of connectors and other components, such as explosion-proof valves and water-cooling connectors, on the third side wall, facilitating normal charging and discharging of the battery device. The third side wall also seals the opening, improving the sealing of the box.

[0036] In a second aspect, the present application further provides an electrical device, comprising a battery device according to any one of the embodiments of the first aspect, wherein the battery device is used to provide electrical energy to the electrical device.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0040] Figure 2 A schematic diagram of the structural decomposition of a battery device provided in some embodiments of the present application;

[0041] Figure 3 A schematic diagram of the internal structure of a battery device provided in some embodiments of the present application;

[0042] Figure 4 A schematic structural diagram of a second wall provided in some embodiments of the present application;

[0043] Figure 5 A schematic structural diagram of a second wall provided in some other embodiments of the present application;

[0044] Figure 6 A schematic structural diagram of a first wall provided in some embodiments of the present application;

[0045] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0046] Icons: 1-battery device; 10-first battery cell assembly; 20-housing; 21-first storage space; 22-first wall; 221-second surface; 2211-first region; 2212-second region; 22121-groove; 22122-first groove section; 22123-second groove section; 222-second heat exchange channel; 223-bottom wall; 23-second wall; 231-first surface; 2311-waterproof layer; 232 -First heat exchange channel; 233-bracket; 24-third wall; 241-first side wall; 242-second side wall; 243-third side wall; 25-first sub-box; 26-second sub-box; 27-second accommodating space; 28-top wall; 29-opening; 30-adsorbent; 40-second battery cell assembly; 100-vehicle; 110-controller; 120-motor; X-direction of gravity; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art 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 and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0049] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, the term "and / or" simply describes the relationship between related objects, indicating that three possible relationships 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 indicates that the related objects are in an "or" relationship.

[0052] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] 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, parallel, or hybrid via a busbar.

[0054] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0055] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies, the battery cell assemblies are accommodated in the box.

[0056] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0057] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0058] As an example, the box forms a closed space to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed.

[0059] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that the box forms a closed space inside to accommodate the battery cell assembly.

[0060] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0061] In some embodiments, the battery device refers to an energy storage device, which includes a box, at least one side of the box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0063] 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0064] The development of battery technology requires simultaneous consideration of multiple design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters. In addition, as environmental conditions and / or internal battery conditions change, the reliability of the battery device is also one of the key considerations.

[0065] Currently, battery cell assemblies are housed within a box and supported by the bottom wall, forming a battery device. Liquid may adhere to the surface of the box wall above the battery cell assembly, facing the battery cell assembly. This liquid may be from outside the box wall due to a failure in the box seal, or from condensation formed on the wall surface due to a temperature difference between the inside and outside of the heat exchange channel formed within the box wall. Liquid adhering to the wall surface may drip onto the battery cell assembly under the action of gravity, causing insulation failure in the battery cell assembly and, consequently, a short circuit in the battery cell assembly, impacting the reliability of the battery device.

[0066] Based on the above considerations, in order to address the issue of liquid adhering to the surface of the box wall above the battery cell assembly dripping onto the battery cell assembly, causing the battery cell assembly to short-circuit and thus affecting the reliability of the battery device, an embodiment of the present application provides a battery device, comprising a first battery cell assembly and a box body. The box body has a first accommodating space for accommodating the first battery cell assembly. The box body comprises a first wall, a second wall, and two third walls. The second wall, the first battery cell assembly, and the first wall are sequentially arranged along the direction of gravity. The first wall supports the first battery cell assembly. The two third walls are arranged opposite each other along a first direction. The first battery cell assembly is arranged between the two third walls. The first direction is perpendicular to the direction of gravity. The second wall has a first surface facing the first battery cell assembly. In the first direction, the distance between the first surface and the first wall in the direction of gravity first increases and then decreases. The two ends of the first surface are respectively connected to the two third walls.

[0067] In the first direction, the distance between the first surface and the first wall in the direction of gravity first increases and then decreases, and the two ends of the first surface are respectively connected to the two third walls, that is, the height of the first surface in the direction of gravity is higher in the middle and lower on both sides, which can guide the liquid attached to the first surface (such as condensed water or other liquid) to the third wall, so that the liquid is guided to the first wall through the third wall, which is beneficial to reducing the risk of the liquid attached to the first surface dripping onto the first battery cell assembly, thereby causing the insulation failure of the first battery cell assembly, thereby reducing the risk of short circuit of the first battery cell assembly, 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 that use 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.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0070] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of a vehicle provided in some embodiments of the present application. Vehicle 100 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 vehicle, or an extended-range vehicle, etc. A battery device 1 is provided inside the vehicle 100. The battery device 1 can be provided at the bottom, head, or tail of the vehicle 100. The battery device 1 can be used to power the vehicle 100. For example, the battery device 1 can serve as the operating power source of the vehicle 100 and be used for the circuit system of the vehicle 100, such as for the working power requirements during the startup, navigation, and operation of the vehicle 100.

[0071] The vehicle 100 may further include a controller 110 and a motor 120 . The controller 110 is used to control the battery device 1 to supply power to the motor 120 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 100 .

[0072] In some embodiments of the present application, the battery device 1 can serve not only as an operating power source for the vehicle 100 , but also as a driving power source for the vehicle 100 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100 .

[0073] Please refer to Figures 2 to 4 , Figure 2 This is a schematic diagram of the structural decomposition of the battery device provided in some embodiments of the present application. Figure 3 Schematic diagram of the internal structure of the battery device provided in some embodiments of the present application, Figure 4 This is a schematic diagram of the structure of the second wall provided in some embodiments of the present application, wherein Figure 3 and Figure 4Part of the box wall of the box is hidden in the box. The embodiment of the present application provides a battery device 1. The battery device 1 includes a first battery cell assembly 10 and a box 20. The box 20 has a first accommodating space 21 for accommodating the first battery cell assembly 10. The box 20 includes a first wall 22, a second wall 23 and two third walls 24. The second wall 23, the first battery cell assembly 10 and the first wall 22 are distributed in sequence along the gravity direction X. The first wall 22 supports the first battery cell assembly 10. The two third walls 24 are arranged opposite to each other along the first direction Y. The first battery cell assembly 10 is arranged between the two third walls 24. The first direction Y is perpendicular to the gravity direction X. Among them, the second wall 23 has a first surface 231 facing the first battery cell assembly 10. Along the first direction Y, the distance between the first surface 231 and the first wall 22 in the gravity direction X first increases and then decreases. The two ends of the first surface 231 are respectively connected to the two third walls 24.

[0074] In some embodiments, the battery device 1 may include a housing 20, and the first battery cell assembly 10 is accommodated in the housing 20. The housing 20 is used to provide a storage space for the first battery cell assembly 10, and the housing 20 may adopt various structures.

[0075] In some embodiments, the box 20 may include a first sub-box 25 and a second sub-box 26 . The first sub-box 25 and the second sub-box 26 cover each other. The first sub-box 25 and the second sub-box 26 together define an accommodating space for accommodating the first battery cell assembly 10 .

[0076] In the battery device 1, the first battery cell assembly 10 may include multiple battery cells, which may be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells may be directly connected in series, parallel, or in a hybrid configuration, and the entire assembly of multiple battery cells may then be housed within the housing 20. Alternatively, the battery device 1 may comprise multiple battery cell assemblies 10 first connected in series, parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, parallel, or in a hybrid configuration to form a single assembly, which is then housed within the housing 20.

[0077] The first 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.

[0078] In some embodiments, the direction of gravity may be represented by the direction indicated by the letter X in the figure.

[0079] In some embodiments, the gravity direction X may be parallel to the height direction of the battery device 1 .

[0080] In some embodiments, the second wall 23 , the first battery cell assembly 10 , and the first wall 22 may be sequentially distributed along the gravity direction X. The thickness directions of the first wall 22 and the second wall 23 may both be parallel to the gravity direction X.

[0081] The first wall 22 may be located below the first battery cell assembly 10, supporting the first battery cell assembly 10. The second wall 23 may be located above the first battery cell assembly 10, and may be spaced apart from the first battery cell assembly 10 to reduce the risk of interference between the second wall 23 and the first battery cell assembly 10.

[0082] In some embodiments, the first direction may be represented by the direction indicated by the letter Y in the figure.

[0083] In some embodiments, the first direction Y may be a width direction of the battery device 1. The first direction Y may be perpendicular to the gravity direction X.

[0084] In some embodiments, two third walls 24 are spaced apart along the first direction Y. The two third walls 24 can be respectively connected to both ends of the first wall 22 in the first direction Y, and the lower ends of the third walls 24 in the gravity direction X are connected to the first wall 22 .

[0085] In some embodiments, both ends of the second wall 23 in the first direction Y may be connected to the two third walls 24 , respectively, so that both ends of the first surface 231 are connected to the two third walls 24 , respectively.

[0086] In some embodiments, both ends of the first battery cell assembly 10 may be spaced apart from two third walls 24 in the first direction Y. That is, one end of the first battery cell assembly 10 in the first direction Y is spaced apart from the third wall 24 that the one end faces, and the other end of the first battery cell assembly 10 in the first direction Y is spaced apart from the third wall 24 that the other end faces.

[0087] In some embodiments, the end of the third wall 24 facing away from the first wall 22 in the gravity direction X may be connected to the second wall 23. Alternatively, the end of the third wall 24 facing away from the first wall 22 in the gravity direction X may extend beyond the second wall 23, that is, the end of the third wall 24 facing away from the first wall 22 in the gravity direction X may be located above the second wall 23.

[0088] In some embodiments, the second wall 23 has an upper surface and a lower surface opposite to each other in the gravity direction X. The lower surface is the surface of the second wall 23 facing the first battery cell assembly 10 , that is, the first surface 231 is the lower surface of the second wall 23 .

[0089] In some embodiments, along the first direction Y, the distance between the first surface 231 and the first wall 22 in the gravity direction X first increases and then decreases. In the gravity direction X, the distance between one end of the first surface 231 in the first direction Y and the first wall 22 is smaller. Along the first direction Y, the distance between the first surface 231 and the first wall 22 gradually increases. After reaching a maximum distance between the first surface 231 and the first wall 22, the distance between the first surface 231 and the first wall 22 gradually decreases, such that the distance between the ends of the first surface 231 in the first direction Y and the first wall 22 is smaller than the distance between the middle portion of the first surface 231 and the first wall 22. That is, the middle portion of the first surface 231 is higher, and the height of the first surface 231 gradually decreases from the middle portion toward the ends in the first direction Y, so that liquid on the first surface 231 flows from the middle to the ends.

[0090] It should be noted that the middle portion here does not refer to the center position of the first surface 231 , but refers to the portion between the two end edges of the first surface 231 in the first direction Y.

[0091] In some embodiments, in the gravity direction X, the distance between the center position of the first surface 231 and the first wall 22 may be the largest.

[0092] In some embodiments, in the gravity direction X, the distance between one end of the first surface 231 in the first direction Y and the first wall 22 may be equal to or different from the distance between the other end of the first surface 231 in the first direction Y. That is, the heights of the two ends of the first surface 231 in the first direction Y may be the same or different.

[0093] In some embodiments, when liquid is attached to the first surface 231 , the liquid flows from the middle portion of the first surface 231 to both ends of the first surface 231 and flows along the gravity direction X along the surface of the third wall 24 facing the first battery cell assembly 10 .

[0094] It should be noted that the liquid attached to the first surface 231 here can be liquid leaked from the outside of the box body 20 to the inside of the box body 20, or it can be a heat exchange channel provided inside the second wall 23, and condensed water is generated on the first surface 231 due to the temperature difference between the inside and outside of the heat exchange channel.

[0095] According to the technical solution of the embodiment of the present application, in the first direction Y, the distance between the first surface 231 and the first wall 22 in the gravity direction X first increases and then decreases, and the two ends of the first surface 231 are respectively connected to the two third walls 24, that is, the height of the first surface 231 in the gravity direction X is higher in the middle and lower on both sides, which can guide the liquid (such as condensed water or other liquid) attached to the first surface 231 to the third wall 24, so that the liquid is guided to the first wall 22 via the third wall 24, which is beneficial to reducing the risk of the liquid attached to the first surface 231 dripping onto the first battery cell assembly 10, thereby causing the insulation failure of the first battery cell assembly 10, thereby reducing the risk of short circuit of the first battery cell assembly 10, and improving the reliability of the battery device 1.

[0096] Please refer to Figure 3 and Figure 4 In some embodiments, on a projection plane perpendicular to the second direction Z, the orthographic projection of the first surface 231 is an arc, and the first direction Y, the second direction Z, and the gravity direction X are perpendicular to each other.

[0097] In some embodiments, the second direction may be represented by the direction indicated by the letter Z in the figure.

[0098] In some embodiments, the second direction Z may be a length direction of the battery device 1. The first battery cell assembly 10 may include a plurality of battery cells, and the plurality of battery cells may be arranged along the second direction Z.

[0099] In some embodiments, the first surface 231 is projected onto a projection plane perpendicular to the second direction Z, with the second direction Z as the projection direction. The orthographic projection of the first surface 231 may be an arc, which may be convex away from the first battery cell assembly 10 .

[0100] The technical solution of the embodiment of the present application takes the second direction Z as the projection direction, and the positive projection of the first surface 231 is an arc, which can enable the liquid on the first surface 231 to flow to the two ends of the first surface 231 in the first direction Y under the action of gravity, thereby reducing the risk of the liquid on the first surface 231 dripping onto the first battery cell assembly 10 and causing insulation failure of the first battery cell assembly 10, reducing the risk of short circuit of the first battery cell assembly 10, and helping to improve the reliability of the battery device 1.

[0101] Please refer to Figure 4 In some embodiments, in the gravity direction X, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 is h, which satisfies: 2mm≤h≤30mm.

[0102] In some embodiments, the highest point of the first surface 231 may be the point where the first surface 231 is farthest from the first wall 22 in the gravity direction X.

[0103] In some embodiments, the lowest point of the first surface 231 may be the point where the first surface 231 is closest to the first wall 22 in the gravity direction X.

[0104] In some embodiments, the first surface 231 may have only one lowest point, and the lowest point of the first surface 231 is one end of the first surface 231 in the first direction Y.

[0105] In some embodiments, the first surface 231 may have two lowest points, and the lowest points of the first surface 231 are two ends of the first surface 231 in the first direction Y.

[0106] In some embodiments, in the direction of gravity X, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 is h, which satisfies the condition: 2 mm ≤ h ≤ 30 mm. h can be any value among 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or a value between any two values.

[0107] According to the technical solution of the embodiment of the present application, in the gravity direction X, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 meets the above conditions. For example, when h ≥ 2 mm, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 is large, which enables the liquid on the first surface 231 to flow better to the two ends of the first surface 231 in the first direction Y under the action of gravity, thereby reducing the risk of short circuit of the first battery cell assembly 10 and improving the reliability of the battery device 1; when h ≤ 30 mm, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 is small, and the descending amplitude of the first surface 231 from the highest point to the lowest point is small. When the size of the box body 20 in the gravity direction X remains unchanged, the risk of interference between the first surface 231 and the first battery cell assembly 10 can be reduced.

[0108] Please refer to Figure 4 , in some embodiments, 5mm≤h≤10mm.

[0109] In some embodiments, in the direction of gravity X, the height difference between the highest point of the first surface 231 and the lowest point of the first surface 231 is h, which satisfies the condition: 5 mm ≤ h ≤ 10 mm. h can be any value among 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or a value between any two values.

[0110] The technical solution of the embodiment of the present application can further reduce the risk of short circuit of the first battery monomer assembly 10 in the gravity direction X, and further reduce the risk of interference between the first surface 231 and the first battery monomer assembly 10, thereby improving the reliability of the battery device 1.

[0111] Please refer to Figure 6 , Figure 6 The structure of the first wall provided in some embodiments of the present application is shown in the schematic view, wherein Figure 6 In some embodiments, the first wall 22 has a second surface 221 facing the first battery monomer assembly 10, and the second surface 221 includes a first region 2211 and a second region 2212. In the projection plane perpendicular to the gravity direction X, the first region 2211 overlaps the first battery monomer assembly 10 in the orthographic projection, and the second region 2212 does not overlap the first battery monomer assembly 10 in the orthographic projection. The third wall 24 is connected to the second region 2212 in the gravity direction X, and the second region 2212 is provided with a groove portion 22121 for collecting condensed water.

[0112] In some embodiments, the first wall 22 has an upper surface and a lower surface in the gravity direction X, and the upper surface is the surface of the first wall 22 facing the first battery monomer assembly 10, i.e., the second surface 221 is the upper surface of the first wall 22.

[0113] In some embodiments, the second surface 221 includes a first region 2211 and a second region 2212. In the projection plane perpendicular to the gravity direction X, the orthographic projection of the first region 2211 overlaps the orthographic projection of the first battery monomer assembly 10, and the orthographic projection of the second region 2212 does not overlap the orthographic projection of the first battery monomer assembly 10. That is, the first region 2211 is in contact with the first battery monomer assembly 10, and the second region 2212 is not in contact with the first battery monomer assembly 10.

[0114] In some embodiments, the number of second regions 2212 can be two, and the two second regions 2212 are connected to the two ends of the first region 2211 in the first direction Y.

[0115] In some embodiments, the second region 2212 is provided with a groove portion 22121, and the number of groove portions 22121 can be one or more.

[0116] In some embodiments, the groove portion 22121 can be provided on the second surface 221 and extend away from the first battery monomer assembly 10 in the gravity direction X.

[0117] In some embodiments, the liquid attached to the first surface 231 flows to both ends of the first surface 231 in the first direction Y under the action of gravity, then flows down along the third wall 24, and finally flows to the second surface 221 of the first wall 22 and is collected to the groove part 22121 of the second area 2212.

[0118] In some embodiments, the groove part 22121 can collect the condensed water of the first surface 231 and other liquids attached to the first surface 231.

[0119] The technical scheme of the embodiments of the present application takes the gravity direction X as the projection direction, the orthographic projection of the second area 2212 does not overlap the orthographic projection of the first battery monomer assembly 10, and the groove part 22121 for collecting condensed water or other liquids is arranged in the second area 2212, which can reduce the risk of the liquid of the first surface 231 falling to the second surface 221 and contacting the first battery monomer assembly 10, thereby reducing the risk of short circuit of the first battery monomer assembly 10 and facilitating improvement of the reliability of the battery device 1.

[0120] Please refer to Figure 6 In some embodiments, the groove part 22121 is arranged apart from the first battery monomer assembly 10.

[0121] In some embodiments, the groove part 22121 is arranged apart from the first battery monomer assembly 10, that is, the groove part 22121 does not contact the first area 2211 in the first direction Y.

[0122] In some embodiments, the groove part 22121 is arranged in the second area 2212 and can be arranged at one end of the second area 2212 away from the first area 2211. The groove part 22121 can be arranged at the connection between the second area 2212 and the third wall 24, or the distance between the groove part 22121 and the third wall 24 is relatively close, so that after the liquid of the first surface 231 flows down along the third wall 24, it can be better collected in the groove part 22121.

[0123] The technical scheme of the embodiments of the present application arranges the groove part 22121 apart from the first battery monomer assembly 10, which can reduce the risk of the condensed water collected in the groove part 22121 contacting the first battery monomer assembly 10, thereby reducing the risk of short circuit of the first battery monomer assembly 10 and facilitating improvement of the reliability of the battery device 1.

[0124] Please refer to Figure 6 and refer to Figure 7 , Figure 7 is Figure 6 An enlarged view of position A in FIG. 8. In some embodiments, in the gravity direction X, the depth of the groove part 22121 is D, which satisfies: 3mm≤D≤10mm.

[0125] In some embodiments, the depth of the groove 22121 in the direction of gravity X is D, satisfying the condition: 3 mm ≤ D ≤ 10 mm. D can be any value among 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or a value between any two values.

[0126] The technical solution of the embodiment of the present application satisfies the aforementioned conditions in the direction of gravity X, thereby reducing the risk of condensed water or other liquids collecting in the groove 22121 and overflowing from the groove 22121, thereby contacting the first battery cell assembly 10, thereby reducing the risk of short circuiting the first battery cell assembly 10. Furthermore, the risk of the groove 22121 being disposed in the first wall 22 affecting the structural strength of the first wall 22 is reduced.

[0127] Please refer to Figure 6 and Figure 7 , in some embodiments, 3mm≤D≤6mm.

[0128] In some embodiments, the depth of the groove 22121 in the direction of gravity X is D, satisfying the condition: 3 mm ≤ D ≤ 6 mm. D can be any value among 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or a value between any two values.

[0129] According to the technical solution of the embodiment of the present application, in the gravity direction X, the depth of the groove 22121 meets the above conditions, which can further reduce the risk of condensed water or other liquids contacting the first battery cell assembly 10 and causing a short circuit in the first battery cell assembly 10; at the same time, it can further reduce the risk of the groove 22121 affecting the structural strength of the first wall 22.

[0130] Please refer to Figure 7 In some embodiments, the groove portion 22121 includes a first groove section 22122 and a second groove section 22123 arranged along the gravity direction X. One end of the first groove section 22122 extends to the second surface 221, and the other end is connected to the second groove section 22123. The width of the first groove section 22122 is smaller than the width of the second groove section 22123.

[0131] In some embodiments, the first trough section 22122 and the second trough section 22123 are arranged along the gravity direction X, and the first trough section 22122 may be located above the second trough section 22123 .

[0132] In some embodiments, the liquid on the first surface 231 flows to both ends of the first surface 231 in the first direction Y under the action of gravity, then flows to the second area 2212 through the third wall 24 , and is collected in the second trough section 22123 through the first trough section 22122 .

[0133] In some embodiments, the width of the first trough section 22122 may be smaller than the width of the second trough section 22123. In the direction of gravity X, the inner diameter of the first trough section 22122 may remain unchanged, and the inner diameter of the second trough section 22123 may remain unchanged. Alternatively, the inner diameter of the first trough section 22122 may be smaller than the inner diameter of the second trough section 22123.

[0134] In some embodiments, the central axis of the first slot segment 22122 may coincide with the central axis of the second slot segment 22123 .

[0135] Liquid can be collected in the second trough section 22123. When liquid enters the second trough section 22123 from the first trough section 22122, splashing may occur. Alternatively, shaking of the battery device 1 during use may cause liquid in the trough portion 22121 to splash. In some embodiments, the width of the first trough section 22122 is smaller than the width of the second trough section 22123. That is, the inner wall of the second trough section 22123 connecting to the first trough section 22122 may not be parallel to the direction of gravity X. As a result, liquid splashing is blocked by this inner wall, thereby reducing the risk of liquid splashing out of the trough portion 22121.

[0136] It should be noted that, in the direction of gravity X, the depth D of the groove portion 22121 may be the sum of the depth of the first groove section 22122 and the depth of the second groove section 22123 in the direction of gravity X.

[0137] According to the technical solution of the embodiment of the present application, the first groove section 22122 and the second groove section 22123 are connected and the first groove section 22122 extends to the second surface 221. The width of the first groove section 22122 is smaller than the width of the second groove section 22123, so that when the liquid on the first surface 231 is collected in the groove portion 22121, the first groove section 22122 can prevent the liquid in the second groove section 22123 from splashing out, thereby reducing the risk of condensed water or other liquids contacting the first battery cell assembly 10 and causing a short circuit in the first battery cell assembly 10, which is beneficial to improving the reliability of the battery device 1.

[0138] Please refer to Figure 7 In some embodiments, the battery device 1 is further provided with an adsorption member 30 . The adsorption member 30 is disposed in the box body 20 . The adsorption member 30 is used to adsorb condensed water in the box body 20 .

[0139] In some embodiments, the adsorbent 30 may be a desiccant, such as activated carbon.

[0140] In some embodiments, the adsorption member 30 may be disposed on a wall of the box body 20 , such as the first wall 22 , the second wall 23 , the third wall 24 , or other walls of the box body 20 .

[0141] In some embodiments, the adsorption member 30 may be disposed in the groove 22121 .

[0142] According to the technical solution of the embodiment of the present application, the adsorbent 30 has good water absorption and can absorb the liquid in the box body 20, thereby reducing the risk of condensed water or other liquids coming into contact with the first battery cell assembly 10 and causing a short circuit in the first battery cell assembly 10, which is beneficial to improving the reliability of the battery device 1.

[0143] Please refer to Figure 2 and Figure 3 In some embodiments, the battery device 1 further includes a second battery cell assembly 40. The second wall 23 is disposed between the second battery cell assembly 40 and the first battery cell assembly 10, and the second wall 23 supports the second battery cell assembly 40. A first heat exchange channel 232 is formed within the second wall 23, and the first heat exchange channel 232 is used to accommodate a heat exchange medium.

[0144] In some embodiments, the battery device 1 may include a housing 20, in which the first battery cell assembly 10 and the second battery cell assembly 40 are accommodated. The housing 20 is used to provide a space for accommodating the first battery cell assembly 10 and the second battery cell assembly 40, and the housing 20 may adopt various structures.

[0145] In some embodiments, the housing 20 may include a first sub-housing 25 and a second sub-housing 26. The first sub-housing 25 and the second sub-housing 26 cover each other and together define a storage space for accommodating the first battery cell assembly 10 and the second battery cell assembly 40. In some embodiments, the first battery cell assembly 10 and the second battery cell assembly 40 are arranged along the gravity direction X. The structure of the first battery cell assembly 10 and the structure of the second battery cell assembly 40 may be the same or different.

[0146] In some embodiments, with the gravity direction X as the projection direction, the orthographic projection of the first battery cell assembly 10 and the orthographic projection of the second battery cell assembly 40 may completely overlap or partially overlap.

[0147] In some embodiments, the heat exchange medium can be liquid, gas, etc.

[0148] In some embodiments, the heat exchange medium may be a coolant to cool the second battery cell assembly 40 . The heat exchange medium may also be a heating medium to heat the second battery cell assembly 40 .

[0149] In the technical solution of the embodiment of the present application, the first battery cell assembly 10 and the second battery cell assembly 40 are arranged along the gravity direction X, and the first battery cell assembly 10 and the second battery cell assembly 40 are disposed within the same housing 20. This allows the battery device 1 to have better space utilization, thereby increasing the energy density of the battery device 1. Furthermore, a first heat exchange channel 232 is provided on the second wall 23 supporting the second battery cell assembly 40. This allows the heat exchange medium in the first heat exchange channel 232 to regulate the temperature of the second battery cell assembly 40, thereby reducing the impact of temperature on the charge and discharge performance of the second battery cell assembly 40.

[0150] Please refer to Figure 2 and Figure 3 In some embodiments, a second heat exchange channel 222 is formed inside the first wall 22 , and the second heat exchange channel 222 is used to accommodate a heat exchange medium.

[0151] In some embodiments, the heat exchange medium can be liquid, gas, etc.

[0152] In some embodiments, the heat exchange medium may be a coolant to cool the first battery cell assembly 10 . The heat exchange medium may also be a heating medium to heat the first battery cell assembly 10 .

[0153] It should be noted that, in some embodiments, a groove 22121 may be provided on the second surface 221 of the first wall 22, with the gravity direction X as the projection direction, and the orthographic projection of the groove 22121 does not overlap with the orthographic projection of the second heat exchange channel 222, that is, the groove 22121 and the second heat exchange channel 222 are staggered, and the groove 22121 is not connected to the second heat exchange channel 222, so as to reduce the risk of leakage of the heat exchange medium in the second heat exchange channel 222.

[0154] The technical solution of the embodiment of the present application is to set a second heat exchange channel 222 on the first wall 22 supporting the first battery cell assembly 10, so that the heat exchange medium in the second heat exchange channel 222 can regulate the temperature of the first battery cell assembly 10, thereby reducing the impact of temperature on the charging and discharging performance of the first battery cell assembly 10.

[0155] Please refer to Figure 5 , Figure 5 This is a schematic structural diagram of the second wall provided in some other embodiments of the present application, wherein: Figure 5 In some embodiments, the first surface 231 is provided with a waterproof layer 2311.

[0156] In some embodiments, the waterproof layer 2311 can be provided on the first surface 231 by spraying.

[0157] In some embodiments, in the first direction Y, the thicknesses of various parts of the waterproof layer 2311 may be the same, and the thickness of the waterproof layer 2311 is the size of the waterproof layer 2311 in the gravity direction X.

[0158] In some embodiments, the material of the waterproof layer 2311 can be a material used to prevent moisture penetration, such as polyurethane waterproof coating, liquid rubber material, etc.

[0159] According to the technical solution of the embodiment of the present application, the waterproof layer 2311 has good hydrophobicity, and the waterproof layer 2311 is provided on the first surface 231, so that the condensed water or other liquid on the first surface 231 can be better moved on the first surface 231 under the action of gravity, so that the condensed water or other liquid can be better moved to the two ends of the first surface 231 in the first direction Y, thereby reducing the risk of the condensed water or other liquid contacting the first battery cell assembly 10 and causing the first battery cell assembly 10 to short-circuit, which is beneficial to improving the reliability of the battery device 1.

[0160] Please refer to Figure 2 and Figure 3 In some embodiments, the housing 20 includes a first sub-housing 25 and a second sub-housing 26 . The first sub-housing 25 and the second sub-housing 26 are disposed opposite each other along the direction of gravity X and are interlocked. The battery device 1 also includes a second battery cell assembly 40 and a bracket 233 . The first sub-housing 25 and the bracket 233 define a first accommodating space 21 , in which the first battery cell assembly 10 is accommodated. The second sub-housing 26 and the bracket 233 define a second accommodating space 27 , in which the second battery cell assembly 40 is accommodated. The bracket 233 serves as the second wall 23 .

[0161] In some embodiments, the structures of the first sub-box 25 and the second sub-box 26 may be the same or different.

[0162] In some embodiments, the bracket 233 may be made of metal, such as copper, aluminum, etc.

[0163] In some embodiments, the bracket 233 is disposed in the box body 20 , and can divide the internal space of the box body 20 into a first accommodating space 21 and a second accommodating space 27 .

[0164] In some embodiments, the bracket 233 and the first sub-case 25 form a first receiving space 21 in which the first battery cell assembly 10 is received. The bracket 233 and the second sub-case 26 form a second receiving space 27 in which the second battery cell assembly 40 is received.

[0165] The second battery cell assembly 40 is located above the first battery cell assembly 10 , that is, the second sub-box 26 may be an upper box, and the first sub-box 25 may be a lower box.

[0166] In some embodiments, a surface of the bracket 233 facing the first battery cell assembly 10 may be a first surface 231 .

[0167] In some embodiments, the bracket 233 can be mounted on the box body 20 by bolting, welding, etc.

[0168] According to the technical solution of the embodiment of the present application, the first sub-box 25 and the second wall 23 form a first accommodating space 21 for accommodating the first battery cell assembly 10, and the second sub-box 26 and the second wall 23 form a second accommodating space 27 for accommodating the second battery cell assembly 40, so that the first battery cell assembly 10 and the second battery cell assembly 40 can be stacked along the gravity direction X, thereby reducing the risk of interference between the first battery cell assembly 10 and the second battery cell assembly 40, and improving the reliability of the battery device 1.

[0169] Please refer to Figure 2 and Figure 3 In some embodiments, the box body 20 includes a bottom wall 223 and a top wall 28 arranged opposite to each other along the gravity direction X, two first side walls 241 arranged opposite to each other along the first direction Y, two second side walls 242 arranged opposite to each other along the first direction Y, and two third side walls 243 arranged opposite to each other along the second direction Z. The two first side walls 241 are arranged at both ends of the bottom wall 223 in the first direction Y to form a first sub-box body 25, and the two second side walls 242 are arranged at both ends of the top wall 28 in the first direction Y to form a second sub-box body 26. The first sub-box body 25 and the second sub-box body 26 are buckled together and form openings 29 at both ends in the second direction Z. The two third side walls 243 respectively close the two openings 29.

[0170] In some embodiments, the lower end of the first side wall 241 in the gravity direction X is connected to the bottom wall 223, and the two first side walls 241 are arranged at the two ends of the bottom wall 223 in the first direction Y to form a first sub-box 25, that is, the two ends of the first sub-box 25 in the second direction Z are not closed.

[0171] In some embodiments, the upper end of the second side wall 242 in the gravity direction X is connected to the top wall 28, and the two second side walls 242 are arranged at the two ends of the top wall 28 in the first direction Y to form a second sub-box 26, that is, the two ends of the second sub-box 26 in the second direction Z are not closed.

[0172] When the first sub-box body 25 and the second sub-box body 26 are buckled, the top wall 28 and the bottom wall 223 are oppositely arranged in the gravity direction X, one first side wall 241 is connected with one second side wall 242 at the upper end of the first side wall 241 in the gravity direction X and the lower end of the second side wall 242 in the gravity direction X, the other first side wall 241 is connected with the other second side wall 242 at the upper end of the first side wall 241 in the gravity direction X and the lower end of the second side wall 242 in the gravity direction X, and the openings 29 are formed at both ends of the box body 20 in the second direction Z. The first side wall 241 and the second side wall 242 can be connected by welding or bolted. One first side wall 241 and one second side wall 242 form a third wall 24.

[0173] In some embodiments, one third wall 243 closes the opening 29 at one end of the box body 20 in the second direction Z, and the other third wall 243 closes the opening 29 at the other end of the box body 20 in the second direction Z.

[0174] In some embodiments, the first wall 22 can be the bottom wall 223 of the box body 20. The second wall 23 can be the support 233 of the box body 20 supporting the second battery monomer assembly 40.

[0175] The technical scheme of the embodiments of the present application sets the third wall 243, which facilitates the installation of connectors and other components such as explosion-proof valves, water cooling connectors, etc. on the third wall 243, and facilitates the normal charging and discharging work of the battery device 1. And the third wall 243 closes the opening 29, which improves the sealing performance of the box body 20.

[0176] The embodiments of the present application also provide a power utilization device, which comprises the battery device 1 of any of the above embodiments, and the battery device 1 is used to provide electric energy for the power utilization device.

[0177] Please refer to Figures 2 to 4 In some embodiments, the battery device 1 comprises a first battery monomer assembly 10, a second battery monomer assembly 40, a box body 20 and a support 233. The box body 20 comprises a first sub-box body 25 and a second sub-box body 26. The first sub-box body 25 comprises a bottom wall 223 and two first side walls 241, and the two first side walls 241 are oppositely arranged along the first direction Y and arranged at both ends of the bottom wall 223 in the first direction Y. The second sub-box body 26 comprises a top wall 28 and two second side walls 242, and the two second side walls 242 are oppositely arranged along the first direction Y and arranged at both ends of the top wall 28 in the first direction Y.

[0178] The first sub-box 25 and the second sub-box 26 are interlocked with each other, the bottom wall 223 and the top wall 28 are arranged opposite to each other in the gravity direction X, and the end of the first side wall 241 facing away from the bottom wall 223 is connected to the end of the second side wall 242 facing away from the top wall 28. The first sub-box 25 and the second sub-box 26 form a box body 20, and the box body 20 has openings 29 at both ends in the second direction Z.

[0179] The bracket 233 is connected to the two first side walls 241 to form a first accommodation space 21. The first battery cell assembly 10 is disposed in the first accommodation space 21, and the bottom wall 223 supports the first battery cell assembly 10.

[0180] The bracket 233 is connected to the two second side walls 242 to form a second receiving space 27 . The second battery cell assembly 40 is disposed in the second receiving space 27 , and the bracket 233 supports the second battery cell assembly 40 .

[0181] The box body 20 further includes two third side walls 243 , which are distributed to close the openings 29 at both ends of the box body 20 in the second direction Z.

[0182] In some embodiments, a first heat exchange channel 232 is formed inside the bracket 233 , and the first heat exchange channel 232 is used to accommodate a heat exchange medium.

[0183] Along the first direction Y, the distance between the surface of the bracket 233 facing the first battery cell assembly 10 and the bottom wall 223 in the gravity direction X first increases and then decreases. Both ends of the surface of the bracket 233 facing the first battery cell assembly 10 are connected to the two first side walls 241 respectively.

[0184] The technical solution of the embodiment of the present application disposes the first battery cell assembly 10 and the second battery cell assembly 40 within the same housing 20, thereby improving the space utilization of the battery device 1 and increasing the energy density of the battery device 1. Furthermore, due to the temperature difference between the inside and outside of the first heat exchange channel 232, condensation easily accumulates on the surface of the bracket 233 facing the first battery cell assembly 10 (the first surface 231). By increasing and then decreasing the distance between the surface of the bracket 233 facing the first battery cell assembly 10 and the bottom wall 223 along the first direction Y in the direction of gravity X, condensation is allowed to flow under the action of gravity to both ends of the surface of the bracket 233 facing the first battery cell assembly 10 in the first direction Y. The condensation then flows through the first side wall 241 to the bottom wall 223. This reduces the risk of condensation dripping onto the first battery cell assembly 10, thereby causing insulation failure in the first battery cell assembly 10. This reduces the risk of short circuiting in the first battery cell assembly 10, thereby improving the reliability of the battery device 1.

[0185] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. 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 first battery cell assembly; a box having a first accommodating space for accommodating the first battery cell assembly, the box comprising a first wall, a second wall, and two third walls, wherein the second wall, the first battery cell assembly, and the first wall are sequentially arranged along a direction of gravity, the first wall supports the first battery cell assembly, the two third walls are arranged opposite to each other along a first direction, and the first battery cell assembly is arranged between the two third walls, wherein the first direction is perpendicular to the direction of gravity; The second wall has a first surface facing the first battery cell assembly. Along the first direction, the distance between the first surface and the first wall in the direction of gravity first increases and then decreases. Both ends of the first surface are respectively connected to two third walls.

2. The battery device according to claim 1, wherein: On a projection plane perpendicular to the second direction, the orthographic projection of the first surface is an arc, and the first direction, the second direction, and the direction of gravity are perpendicular to each other.

3. The battery device according to claim 1, wherein: In the gravity direction, a height difference between the highest point of the first surface and the lowest point of the first surface is h, which satisfies: 2 mm ≤ h ≤ 30 mm.

4. The battery device according to claim 3, characterized in that 5mm≤h≤10mm.

5. The battery device according to claim 1, wherein: The first wall has a second surface facing the first battery cell assembly, the second surface including a first area and a second area, and on a projection plane perpendicular to the direction of gravity, an orthographic projection of the first area overlaps with an orthographic projection of the first battery cell assembly, and an orthographic projection of the second area does not overlap with an orthographic projection of the first battery cell assembly; One end of the third wall in the gravity direction is connected to the second area. The second area is provided with a groove portion for collecting condensed water.

6. The battery device according to claim 5, characterized in that The groove is spaced apart from the first battery cell assembly.

7. The battery device according to claim 5, characterized in that In the gravity direction, the depth of the groove is D, which satisfies: 3mm≤D≤10mm.

8. The battery device according to claim 7, characterized in that 3mm≤D≤6mm.

9. The battery device according to claim 5, characterized in that The groove portion comprises a first groove section and a second groove section arranged along the gravity direction, one end of the first groove section extends to the second surface, and the other end is connected to the second groove section; Wherein, the width of the first slot section is smaller than the width of the second slot section.

10. The battery device according to claim 1, wherein: The battery device is further provided with an adsorption member, which is arranged in the box body and is used to adsorb condensed water in the box body.

11. The battery device according to claim 1, wherein: The battery device further includes a second battery cell assembly, the second wall is disposed between the second battery cell assembly and the first battery cell assembly, and the second wall supports the second battery cell assembly; A first heat exchange channel is formed inside the second wall, and the first heat exchange channel is used to accommodate a heat exchange medium.

12. The battery device according to claim 1, wherein: A second heat exchange channel is formed inside the first wall, and the second heat exchange channel is used to accommodate a heat exchange medium.

13. The battery device according to claim 1, wherein: The first surface is provided with a waterproof layer.

14. The battery device according to claim 1, wherein: The box includes a first sub-box and a second sub-box, the first sub-box and the second sub-box are arranged opposite to each other along the direction of gravity, and the first sub-box and the second sub-box are buckled together; The battery device further includes a second battery cell assembly and a bracket, the first sub-box and the bracket forming a first accommodation space, the first battery cell assembly being accommodated in the first accommodation space, the second sub-box and the bracket forming a second accommodation space, the second battery cell assembly being accommodated in the second accommodation space; The bracket is the second wall.

15. The battery device according to claim 14, characterized in that The box body includes a bottom wall and a top wall arranged opposite to each other along the gravity direction, two first side walls arranged opposite to each other along a first direction, two second side walls arranged opposite to each other along the first direction, and two third side walls arranged opposite to each other along the second direction; The two first side walls are arranged at both ends of the bottom wall in the first direction to form the first sub-box, and the two second side walls are arranged at both ends of the top wall in the first direction to form the second sub-box. The first sub-box and the second sub-box are buckled together and form openings at both ends in the second direction, respectively. The two third side walls respectively close the two openings. The bottom wall is the first wall.

16. An electrical device, characterized in that: include: The battery device according to any one of claims 1 to 15, wherein the battery device is used to provide electrical energy to the electrical device.

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