Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body and a battery monomer assembly arranged in the box body. The box body comprises a first wall and a second wall. The first wall comprises a body part and a protruding part, the body part is provided with a first surface used for bearing the battery monomer assembly, and the protruding part is arranged on the first surface in a protruding mode. The second wall is arranged on the first surface, the second wall is provided with a groove, and at least part of the protruding part is arranged in the groove. The protruding part is provided with a second surface and a third surface which are oppositely arranged in the first direction, the first direction is perpendicular to the third surface, the second surface is closer to the center of the first surface than the third surface in the first direction, the second surface and the second wall are welded to form a first welding part, and the third surface and the second wall are welded to form a second welding part. On the same projection plane perpendicular to the first direction, the orthographic projection of the first welding part and the orthographic projection of the second welding part are at least partially not overlapped. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

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

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

[0003] In the development of battery 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, including a box body and a battery cell assembly disposed in the box body. The box body includes a first wall and a second wall. The first wall includes a main body portion and a protruding portion, the main body portion having a first surface for carrying the battery cell assembly, and the protruding portion protruding from the first surface. The second wall is disposed on the first surface, and the second wall is provided with a groove, and at least a portion of the protruding portion is disposed in the groove. The protruding portion has a second surface and a third surface disposed opposite to each other along a first direction, the first direction is perpendicular to the third surface, and along the first direction, the second surface is closer to the center of the first surface than the third surface, the second surface is welded to the second wall to form a first welding portion, and the third surface is welded to the second wall to form a second welding portion. On the same projection plane perpendicular to the first direction, the orthographic projection of the first welding portion and the orthographic projection of the second welding portion at least partially do not overlap.

[0007] According to the technical solution of the embodiment of the present application, the protrusion of the first wall is arranged in the groove of the second wall, the second surface and the third surface of the protrusion are arranged opposite to each other along the first direction, the second surface and the second wall are welded to form a first welding portion, and the third surface and the second wall are welded to form a second welding portion, and in the first direction, the projection of the first welding portion and the projection of the second welding portion at least partially do not overlap, thereby reducing the mutual thermal influence between the welding of the second surface and the second wall, and the welding of the third surface and the second wall, improving the quality of the first welding portion and the second welding portion, improving the reliability of the connection between the first wall and the second wall, improving the reliability of the box body, and thus improving the reliability of the battery device.

[0008] In some embodiments, the second wall has a fourth surface and a fifth surface connected to each other, and the first surface, the second surface and the fourth surface together enclose a receiving space, and the receiving space is used to receive the battery cell assembly. The fourth surface is welded to the second surface to form a first welding portion, and the fifth surface is welded to the third surface to form a second welding portion.

[0009] According to the technical solution of the embodiment of the present application, the fourth surface and the second surface form a first welding portion, which can improve the connection stability between the second wall and the first wall while achieving a sealed fit between the fourth surface and the second surface, so as to improve the sealing effect of the accommodating space; the fourth surface and the fifth surface are two surfaces connected to each other of the second wall, and while satisfying the connection stability between the second wall and the first wall, a larger distance can be provided between the first welding portion and the second welding portion, so as to reduce the mutual thermal influence between the welding of the second surface and the second wall, and between the welding of the third surface and the second wall, thereby improving the reliability of the battery device.

[0010] In some embodiments, the second wall also has a sixth surface, the sixth surface and the fourth surface are arranged opposite to each other in the second direction, the fifth surface connects the sixth surface and the fourth surface, the second welding portion extends from the fourth surface to the sixth surface, and the second direction is parallel to the thickness direction of the second wall.

[0011] According to the technical solution of the embodiment of the present application, the fourth surface and the sixth surface are arranged relative to each other, the second welding portion extends from the fourth surface to the sixth surface, and the second welding portion has a longer length in the second direction, which can improve the connection reliability between the first wall and the second wall.

[0012] In some embodiments, the second wall further has a seventh surface, the seventh surface is connected to the first surface, and the seventh surface is connected to the fourth surface and the fifth surface, and the groove is arranged at the intersection of the fourth surface, the fifth surface and the seventh surface.

[0013] According to the technical solution of the embodiment of the present application, the groove is arranged at the intersection of the fourth surface, the fifth surface and the seventh surface, that is, the groove is arranged at a corner of the second wall, which facilitates the connection between the groove and the protrusion and improves the convenience of connecting the first wall and the second wall.

[0014] In some embodiments, the fifth surface is coplanar with the third surface.

[0015] According to the technical solution of the embodiment of the present application, the fifth surface is coplanar with the third surface. After the protrusion cooperates with the groove, the structure formed by the first wall and the second wall occupies less space in the first direction, which is convenient for use and transportation of the battery device.

[0016] In some embodiments, the first welding portion extends along a third direction, the third direction is parallel to a thickness direction of the first wall, and the first direction, the third direction and the second direction are perpendicular to each other.

[0017] In the technical solution of the embodiment of the present application, the first welding part extends along the thickness direction of the first wall, that is, the protrusion and at least part of the second wall extend along the third direction, reducing the risk of the protrusion or the second wall convexity affecting the accommodation space and improving the energy density of the battery device; at the same time, the first welding part extends along the thickness direction of the first wall, and the protrusion and the second wall have a large connection area in the thickness direction of the first wall, which can improve the connection reliability between the protrusion and the second wall. The first direction, the third direction and the second direction are perpendicular to each other, so that after the protrusion and the groove are matched, the accommodation space formed by the first wall and the second wall is more regular, which is convenient for accommodating the battery monomer assembly. At the same time, the structure of the first wall and the second wall is simple and easy to process.

[0018] In some embodiments, taking the first direction as the projection direction, an extension direction of the projection of the first welding portion intersects with a thickness direction of the first wall.

[0019] According to the technical solution of the embodiment of the present application, the extension direction of the first welding portion intersects with the thickness direction of the first wall, that is, the extension direction of the second surface intersects with the thickness direction of the first wall. The processing accuracy requirement when processing the protrusion is relatively low, thereby facilitating processing.

[0020] In some embodiments, on the same projection plane perpendicular to the first direction, the orthographic projection of the first welding portion and the orthographic projection of the second welding portion are set at an angle, and the angle between the orthographic projection of the first welding portion and the orthographic projection of the second welding portion is α, satisfying: 0<α<180°.

[0021] According to the technical solution of the embodiment of the present application, in the first direction, the angle α between the projection of the first welding part and the projection of the second welding part meets the above conditions, which can increase the distance between the first welding part and the second welding part, reduce the thermal impact when forming the first welding part and the second welding part, and improve the reliability of the battery device.

[0022] In some embodiments, 0<α<90°.

[0023] In the technical solution of the embodiment of the present application, in the first direction, the angle α between the projection of the first welding part and the projection of the second welding part meets the above conditions, and the space of the groove can be smaller, thereby reducing the influence of the groove on the structural strength of the second wall.

[0024] In some embodiments, α=90°.

[0025] In the technical solution of the embodiment of the present application, in the first direction, the angle α between the projection of the first welding portion and the projection of the second welding portion meets the above conditions, which is beneficial to the processing and manufacturing of the groove of the second wall.

[0026] In some embodiments, the number of grooves is two, and the two grooves are arranged at two ends of the second wall in the first direction. The number of protrusions is two, and the two protrusions are arranged at two ends of the body in the first direction. One protrusion is arranged correspondingly to one groove.

[0027] The technical solution of the embodiment of the present application provides two grooves to cooperate with two protrusions to improve the reliability of the connection between the first wall and the second wall, thereby improving the reliability of the battery device.

[0028] In some embodiments, the number of the second walls is two, and the two second walls are spaced apart along the second direction. The protrusion extends along the second direction, and two ends of the protrusion in the second direction are respectively corresponding to the grooves of the two second walls.

[0029] According to the technical solution of the embodiment of the present application, the two second walls are spaced apart along the second direction and connected to the two ends of the protrusion in the second direction, thereby improving the reliability of the box body and the reliability of the battery device.

[0030] In a second aspect, the present application further provides an electrical device, comprising a battery device according to any one of the embodiments in the first aspect, and the battery device is used to provide electrical energy.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0034] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0035] Figure 3 A schematic diagram of a first sub-box provided in some embodiments of the present application;

[0036] Figure 4 A schematic diagram of a first welding portion and a second welding portion provided in some embodiments of the present application;

[0037] Figure 5 A schematic diagram of a first welding portion provided in some embodiments of the present application;

[0038] Figure 6 A schematic diagram of a second welding portion provided in some embodiments of the present application;

[0039] Figure 7 A schematic diagram of a second wall provided for some embodiments of the present application;

[0040] Figure 8 Schematic diagram of a first welding portion provided in some other embodiments of the present application;

[0041] Fig. 9 Schematic diagrams of the first welding portion and the second welding portion provided in some other embodiments of the present application.

[0042] Icons: 1-battery device; 10-housing; 11-first wall; 111-main body; 1111-first surface; 112-protrusion; 1121-second surface; 1122-third surface; 12-second wall; 121-groove; 122-fourth surface; 123-fifth surface; 124-sixth surface; 125-seventh surface; 13-first welding part; 14-second welding part; 15-accommodating space; 20-battery cell assembly; 30-first sub-housing; 40-second sub-housing; 41-third wall; 42-fourth wall; 100-vehicle; 110-controller; 120-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0045] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The term "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or the second direction can represent: A exists alone, A and the second direction exist at the same time, and the second direction exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0049] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0050] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0051] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0052] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0053] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0054] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0055] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0056] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0057] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0058] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0059] As an example, the battery cell may be a pouch battery cell.

[0060] At present, from the perspective of market development, battery devices have been widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment, etc. As the application areas of batteries continue to expand, the market demand is also constantly expanding.

[0061] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or internal conditions of the battery change, the reliability of the battery device is also one of the key factors to consider.

[0062] At present, a battery cell assembly is arranged in a box to form a battery device. The box includes a first wall and a second wall connected to each other, and the first wall is used to carry the battery cell assembly. A protrusion is arranged on the surface of the first wall facing the battery cell assembly, and the second wall is connected to the first wall and welded to the protrusion. The first wall is welded to one end of the protrusion, and a first welding portion and a second welding portion are formed on both sides of the protrusion in the thickness direction.

[0063] However, in the thickness direction of the protruding portion, the first welding portion and the second welding portion are arranged opposite to each other, and the projection of the first welding portion overlaps with the projection of the second welding portion. When forming the first welding portion and the second welding portion, due to the high welding temperature, the first welding portion and the second welding portion are easily affected by heat, resulting in poor welding effect of the first welding portion and the second welding portion, resulting in poor connection reliability of the first wall and the second wall, and thus poor reliability of the battery device.

[0064] Based on the above considerations, in order to solve the problem that the connection reliability between the first wall and the second wall is poor, thereby affecting the reliability of the battery device, an embodiment of the present application provides a battery device, including a box body and a battery cell assembly arranged in the box body. The box body includes a first wall and a second wall. The first wall includes a main body and a protruding portion, the main body has a first surface for carrying the battery cell assembly, and the protruding portion is protruding from the first surface. The second wall is arranged on the first surface, and the second wall is provided with a groove, and at least part of the protruding portion is arranged in the groove. Among them, the protruding portion has a second surface and a third surface arranged oppositely along a first direction, the first direction is perpendicular to the third surface, and along the first direction, the second surface is closer to the center of the first surface than the third surface, the second surface is welded to the second wall to form a first welding portion, and the third surface is welded to the second wall to form a second welding portion, and on the same projection plane perpendicular to the first direction, the orthographic projection of the first welding portion and the orthographic projection of the second welding portion at least partially do not overlap.

[0065] A groove is provided on the second wall, and the protrusion is provided in the groove. The second surface and the third surface of the protrusion are arranged opposite to each other along the thickness direction of the protrusion, the second surface is welded to the second wall to form a first welding portion, and the third surface is welded to the second wall to form a second welding portion, and in the first direction, the projection of the first welding portion and the projection of the second welding portion at least partially do not overlap, so as to reduce the mutual heat influence between the welding of the second surface and the second wall, and the welding of the third surface and the second wall, improve the quality of the first welding portion and the second welding portion, improve the reliability of the connection between the first wall and the second wall, improve the reliability of the box, and thus improve the reliability of the battery device.

[0066] 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 mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0067] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0068] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 100 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1 is provided inside the vehicle 100, and the battery device 1 may be provided at the bottom, head or tail of the vehicle 100. The battery device 1 may be used to power the vehicle 100. For example, the battery device 1 may be used as an operating power source for the vehicle 100, 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.

[0069] The vehicle 100 may further include a controller 110 and a motor 120 , wherein 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 .

[0070] In some embodiments of the present application, the battery device 1 can not only serve as an operating power source for the vehicle 100 , but also serve 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 .

[0071] The battery device includes a battery cell assembly and a power management system. The battery management system is connected to the battery cell assembly and is used to manage the charging and discharging of the battery cell assembly.

[0072] Please refer to Figure 2 , Figure 2 An exploded view of a battery device provided for some embodiments of the present application. The battery device 1 may further include a housing 10, in which a battery cell assembly 20 is accommodated. The housing 10 is used to provide a storage space for the battery cell assembly 20, and the housing 10 may adopt a variety of structures. In some embodiments, the housing 10 may include a first sub-housing 30 and a second sub-housing 40. The first sub-housing 30 may include a first wall 11 and two second walls 12, and the two second walls 12 are arranged at both ends of the first wall 11 in the second direction Y to form a U-shaped structure. The second sub-housing 40 may include a third wall 41 and two fourth walls 42, and the two fourth walls 42 are arranged at both ends of the third wall 41 in the first direction X to form a U-shaped structure.

[0073] The first sub-box 30 and the second sub-box 40 cover each other, and the first sub-box 30 and the second sub-box 40 jointly define an accommodation space 15 for accommodating the battery cell assembly 20 .

[0074] The first wall 11 and the third wall 41 are arranged opposite to each other in the third direction Z. The second wall 12 is located between the two fourth walls 42, and the two ends of one second wall 12 in the first direction X are respectively connected to one end of the two fourth walls 42 on the same side in the second direction Y, and the two ends of the other second wall 12 in the first direction X are respectively connected to the other ends of the two fourth walls 42 on the same side in the second direction Y. The fourth wall 42 is located between the two second walls 12, and the two ends of one fourth wall 42 in the second direction Y are respectively connected to one end of the two second walls 12 on the same side in the first direction X, and the two ends of the other fourth wall 42 in the second direction Y are respectively connected to the other ends of the two second walls 12 on the same side in the first direction X.

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

[0076] The battery cell assembly 20 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.

[0077] Please refer to Figures 3 to 6 , Figure 3 A schematic diagram of a first sub-box provided in some embodiments of the present application, Figure 4 A schematic diagram of a first welding portion and a second welding portion provided in some embodiments of the present application, Figure 5 A schematic diagram of a first welding portion provided in some embodiments of the present application, Figure 6 Schematic diagram of the second welding part provided in some embodiments of the present application. In order to facilitate the display of the first welding part and the second welding part, Figure 4 A portion of the first wall is hidden. Figure 6Since the first welding portion is blocked by the protrusion, the first welding portion is shown by a dotted line. The embodiment of the present application provides a battery device 1. The battery device 1 includes a box body 10 and a battery cell assembly 20 disposed in the box body 10. The box body 10 includes a first wall 11 and a second wall 12. The first wall 11 includes a main body 111 and a protrusion 112, the main body 111 has a first surface 1111 for carrying the battery cell assembly 20, and the protrusion 112 is protruding from the first surface 1111. The second wall 12 is disposed on the first surface 1111, and the second wall 12 is provided with a groove 121, and at least a portion of the protrusion 112 is disposed in the groove 121. Among them, the protrusion 112 has a second surface 1121 and a third surface 1122 that are oppositely disposed along a first direction X, the first direction X is perpendicular to the third surface 1122, and along the first direction X, the second surface 1121 is closer to the center of the first surface 1111 than the third surface 1122. The second surface 1121 is welded to the second wall 12 to form a first welding portion 13, and the third surface 1122 is welded to the second wall 12 to form a second welding portion 14. On the same projection plane perpendicular to the first direction X, the orthographic projection of the first welding portion 13 and the orthographic projection of the second welding portion 14 at least partially do not overlap.

[0078] In some embodiments, the first wall 11 may include a body portion 111 and a protruding portion 112 , and the body portion 111 is used to support the battery cell assembly 20 .

[0079] In some embodiments, the first surface 1111 may be a surface of the body portion 111 facing the battery cell assembly 20 in a thickness direction thereof. The thickness direction of the body portion 111 may be parallel to the third direction Z.

[0080] In some embodiments, the protrusion 112 is protruded from the first surface 1111 , that is, the protrusion 112 may extend along the third direction Z.

[0081] In some embodiments, the second wall 12 is provided with a groove 121 . The groove 121 may be provided at one end of the second wall 12 facing the first wall 11 , so that the protrusion 112 is provided in the groove 121 .

[0082] In some embodiments, a portion of the protrusion 112 may be disposed in the groove 121 .

[0083] In some embodiments, the protrusion 112 may be entirely disposed within the groove 121 .

[0084] In some embodiments, the first direction may be represented by the direction indicated by the letter X in the figure.

[0085] In some embodiments, the first direction X may be parallel to the width direction of the box body 10 .

[0086] In some embodiments, the third surface 1122 may extend along the third direction Z, that is, the extension direction of the third surface 1122 is parallel to the thickness direction of the body 111. The first direction X may be perpendicular to the third surface 1122, that is, the first direction X may be perpendicular to the thickness direction of the body 111.

[0087] In some embodiments, in the first direction X, the protrusion 112 has a second surface 1121 and a third surface 1122. When the protrusion 112 is disposed in the groove 121, the second surface 1121 can be welded with one surface of the second wall 12 to form a first welding portion 13, and the third surface 1122 can be welded with another surface of the second wall 12 to form a second welding portion 14.

[0088] In some embodiments, the first weld portion 13 and the second weld portion 14 may both be welds.

[0089] In some embodiments, the first welding portion 13 and the second welding portion 14 are projected onto a plane perpendicular to the first direction X, taking the first direction X as a projection direction, to form a projection of the first welding portion 13 and a projection of the second welding portion 14 .

[0090] In some embodiments, the projection of the first welding portion 13 and the projection of the second welding portion 14 may overlap in part or overlap at one end and not overlap at the other end.

[0091] In some embodiments, the projection of the first welding portion 13 and the projection of the second welding portion 14 may not overlap at all.

[0092] In some embodiments, since the projection of the first welding portion 13 and the projection of the second welding portion 14 do not overlap at least partially, when the first welding portion 13 and the second welding portion 14 are formed by welding, the welding positions of the first welding portion 13 and the second welding portion 14 are from near to far, thereby reducing the heat impact when forming the first welding portion 13 and the second welding portion 14 and improving the welding effect.

[0093] According to the technical solution of the embodiment of the present application, the protrusion 112 of the first wall 11 is arranged in the groove 121 of the second wall 12, the second surface 1121 and the third surface 1122 of the protrusion 112 are arranged relatively to each other along the first direction X, the second surface 1121 and the second wall 12 are welded to form a first welding portion 13, and the third surface 1122 and the second wall 12 are welded to form a second welding portion 14, and in the first direction X, the projection of the first welding portion 13 and the projection of the second welding portion 14 at least partially do not overlap, thereby reducing the mutual thermal influence between the welding of the second surface 1121 and the second wall 12 and the welding of the third surface 1122 and the second wall 12, improving the quality of the first welding portion 13 and the second welding portion 14, improving the reliability of the connection between the first wall 11 and the second wall 12, improving the reliability of the box body 10, and thus improving the reliability of the battery device 1.

[0094] Please refer to Figures 2 to 6 , and refer to Figure 7 , Figure 7 Schematic diagram of the second wall provided for some embodiments of the present application. In some embodiments, the second wall 12 has a fourth surface 122 and a fifth surface 123 connected to each other, and the first surface 1111, the second surface 1121 and the fourth surface 122 together enclose a receiving space 15, and the receiving space 15 is used to receive the battery cell assembly 20. The fourth surface 122 and the second surface 1121 are welded to form a first welding portion 13, and the fifth surface 123 and the third surface 1122 are welded to form a second welding portion 14.

[0095] In some embodiments, the second wall 12 has a fourth surface 122 and a fifth surface 123, and the first surface 1111, the second surface 1121 and the fourth surface 122 together enclose the accommodation space 15, that is, the first surface 1111 is the inner surface of the first wall 11 in the thickness direction, the second surface 1121 is the inner surface of the protrusion 112 in the thickness direction, the third surface 1122 is the outer surface of the protrusion 112 in the thickness direction, and the fourth surface 122 is the inner surface of the second wall 12 in the thickness direction. Among them, the inner surface is the surface facing the battery cell assembly 20.

[0096] In some embodiments, the second surface 1121 and the fourth surface 122 are welded to form a first welding portion 13, that is, the first welding portion 13 is located on the inner side of the box body 10. The third surface 1122 and the fifth surface 123 are welded to form a second welding portion 14, that is, the second welding portion 14 is located on the outer side of the box body 10, and the fifth surface 123 is a surface of the second wall 12 corresponding to the protrusion 112 in the thickness direction of the protrusion 112.

[0097] According to the technical solution of the embodiment of the present application, the fourth surface 122 and the second surface 1121 form a first welding portion 13, which can improve the connection stability between the second wall 12 and the first wall 11 while achieving a sealed fit between the fourth surface 122 and the second surface 1121, so as to improve the sealing effect of the accommodating space 15; the fourth surface 122 and the fifth surface 123 are two surfaces connected to each other of the second wall 12, and while satisfying the connection stability between the second wall 12 and the first wall 11, a larger distance can be provided between the first welding portion 13 and the second welding portion 14, so as to reduce the mutual thermal influence between the welding of the second surface 1121 and the second wall 12, and between the welding of the third surface 1122 and the second wall 12, thereby improving the reliability of the battery device 1.

[0098] Please refer to Figures 4 to 7In some embodiments, the second wall 12 further has a sixth surface 124, the sixth surface 124 and the fourth surface 122 are arranged opposite to each other in the second direction Y, the fifth surface 123 connects the sixth surface 124 and the fourth surface 122, the second welding portion 14 extends from the fourth surface 122 to the sixth surface 124, and the second direction Y is parallel to the thickness direction of the second wall 12. In some embodiments, the second direction can be represented by the direction indicated by the letter Y in the figure.

[0099] In some embodiments, the sixth surface 124 may be an outer surface of the second wall 12 in the second direction Y. The outer surface is a surface facing away from the battery cell assembly 20 .

[0100] In some embodiments, the second welding portion 14 extends from the fourth surface 122 to the sixth surface 124 , that is, the size of the second welding portion 14 in the second direction Y is equal to the thickness of the second wall 12 .

[0101] According to the technical solution of the embodiment of the present application, the fourth surface 122 and the sixth surface 124 are arranged relative to each other, the second welding portion 14 extends from the fourth surface 122 to the sixth surface 124, and the second welding portion 14 has a longer length in the second direction Y, which can improve the reliability of the connection between the first wall 11 and the second wall 12.

[0102] Please refer to Figures 4 to 7 In some embodiments, the second wall 12 further has a seventh surface 125, the seventh surface 125 is connected to the first surface 1111, and the seventh surface 125 connects the fourth surface 122 and the fifth surface 123, and the groove 121 is arranged at the intersection of the fourth surface 122, the fifth surface 123 and the seventh surface 125.

[0103] In some embodiments, the seventh surface 125 connects the first surface 1111, the fourth surface 122 and the fifth surface 123, that is, the seventh surface 125 is a surface of the second wall 12 facing the first wall 11. The seventh surface 125 may be disposed opposite to the first surface 1111.

[0104] In some embodiments, the groove 121 is disposed at the intersection of the fourth surface 122 , the fifth surface 123 , and the seventh surface 125 , that is, the groove 121 has an opening in the first direction X, and the groove 121 also has an opening in the second direction Y.

[0105] In some embodiments, the groove 121 may extend to the sixth surface 124 , that is, both ends of the groove 121 in the second direction Y are open.

[0106] In some embodiments, the groove 121 may be disposed at the intersection of the fifth surface 123 , the sixth surface 124 , and the seventh surface 125 .

[0107] According to the technical solution of the embodiment of the present application, the groove 121 is arranged at the intersection of the fourth surface 122, the fifth surface 123 and the seventh surface 125, that is, the groove 121 is arranged at a corner of the second wall 12, which facilitates the connection between the groove 121 and the protrusion 112, thereby improving the convenience of connecting the first wall 11 and the second wall 12.

[0108] Please refer to Figures 3 to 5 In some embodiments, the fifth surface 123 is coplanar with the third surface 1122 .

[0109] In some embodiments, the fifth surface 123 is an outer surface of the second wall 12 in the first direction X, and the third surface 1122 is an outer surface of the protrusion 112 in the first direction X.

[0110] In some embodiments, the fifth surface 123 and the third surface 1122 are welded to form a second welding portion 14, and the second welding portion 14 can be polished to be smooth to improve the aesthetics and the flatness of the outer surface of the box body 10, so that the fifth surface 123, the third surface 1122 and the second welding portion 14 are coplanar.

[0111] In some implementations, the second wall 12 is provided with a groove 121 so that the protrusion 112 is disposed in the groove 121 , that is, at least a portion of the second wall 12 overlaps the protrusion 112 .

[0112] According to the technical solution of the embodiment of the present application, the fifth surface 123 is coplanar with the third surface 1122. After the protrusion 112 cooperates with the groove 121, the structure formed by the first wall 11 and the second wall 12 occupies less space in the first direction X, which is convenient for the use and transportation of the battery device 1.

[0113] Please refer to Figure 4 and Figure 5 In some embodiments, the first welding portion 13 extends along a third direction Z, and the third direction Z is parallel to a thickness direction of the first wall 11 .

[0114] In some embodiments, the third direction may be represented by the direction indicated by the letter Z in the figure.

[0115] In some embodiments, the first welding portion 13 may extend along the third direction Z. The first welding portion 13 may connect one end of the first surface 1111 with the second surface 1121 , and extend to the other end of the second surface 1121 in the third direction Z.

[0116] In some embodiments, the fourth surface 122 and the second surface 1121 are welded to form a first welding portion 13, and the first welding portion 13 extends along the third direction Z. The second surface 1121 extends along the third direction Z, and the edge of the fourth surface 122 contacting the second surface 1121 extends along the third direction Z. That is, the protrusion 112 does not bulge inward toward the accommodation space 15, and the second wall 12 does not bulge inward toward the accommodation space 15.

[0117] According to the technical solution of the embodiment of the present application, the first welding portion 13 extends along the thickness direction of the first wall 11, that is, the protrusion 112 and at least part of the second wall 12 extend along the third direction Z, thereby reducing the risk of the protrusion 112 or the inward bulge of the second wall 12 affecting the accommodating space 15 and improving the energy density of the battery device 1; at the same time, the first welding portion 13 extends along the thickness direction of the first wall 11, and the protrusion 112 and the second wall 12 have a larger connection area in the thickness direction of the first wall 11, which can improve the connection reliability between the protrusion 112 and the second wall 12.

[0118] Please refer to Figures 3 to 6 In some embodiments, the first direction X, the third direction Z and the second direction Y are perpendicular to each other.

[0119] In some embodiments, the first direction X may be a width direction of the box body 10 , the second direction Y may be a length direction of the box body 10 , and the third direction Z may be a height direction of the box body 10 .

[0120] In some embodiments, the first direction X can be parallel to the thickness direction of the protrusion 112, the second direction Y can be parallel to the thickness direction of the second wall 12, and the third direction Z can be parallel to the thickness direction of the first wall 11, that is, the protrusion 112, the first wall 11 and the second wall 12 are perpendicular to each other.

[0121] In the technical solution of the embodiment of the present application, the first direction X, the third direction Z and the second direction Y are perpendicular to each other, so that after the protrusion 112 and the groove 121 cooperate, the accommodating space 15 formed by the first wall 11 and the second wall 12 is relatively regular, which is convenient for accommodating the battery cell assembly 20. At the same time, the structure of the first wall 11 and the second wall 12 is simple and easy to process.

[0122] Please refer to Figure 8 , Figure 8 Schematic diagram of the first welding portion provided in some other embodiments of the present application. In some embodiments, with the first direction X as the projection direction, the extension direction of the projection of the first welding portion 13 intersects with the thickness direction of the first wall 11 .

[0123] In some embodiments, the thickness direction of the first wall 11 may be parallel to the third direction Z.

[0124] In some embodiments, the extension direction of the first welding portion 13 may intersect with the thickness direction of the first wall 11. That is, in the third direction Z, the end of the first welding portion 13 close to the body portion 111 points to the end of the first welding portion 13 away from the body portion 111, and the distance between the first welding portion 13 and the third surface 1122 may gradually increase or decrease.

[0125] In some embodiments, the extension direction of the first welding portion 13 depends on the extension direction of the second surface 1121 and the extension direction of the fourth surface 122. The extension direction of the first welding portion 13 can be parallel to the extension direction of the second surface 1121 or the extension direction of the fourth surface 122.

[0126] In some embodiments, an end of the first welding portion 13 close to the body portion 111 points to an end of the first welding portion 13 away from the body portion 111 , and a distance between the first welding portion 13 and the third surface 1122 gradually decreases.

[0127] According to the technical solution of the embodiment of the present application, the extension direction of the first welding portion 13 intersects with the thickness direction of the first wall 11, that is, the extension direction of the second surface intersects with the thickness direction of the first wall. The processing accuracy requirement when processing the protrusion is relatively low, thereby facilitating processing.

[0128] In some embodiments, on the same projection plane perpendicular to the first direction X, the orthographic projection of the first welding portion 13 and the orthographic projection of the second welding portion 14 are set at an angle, and the angle between the orthographic projection of the first welding portion 13 and the orthographic projection of the second welding portion 14 is α, satisfying: 0<α<180°.

[0129] In some embodiments, the first direction X is used as a projection direction, and the first welding portion 13 and the second welding portion 14 are projected onto the same plane perpendicular to the first direction X to obtain a projection of the first welding portion 13 and a projection of the second welding portion 14 .

[0130] In some embodiments, the angle α between the projection of the first welding portion 13 and the projection of the second welding portion 14 satisfies the condition: 0<α<180°. That is, α can be any value among 1°, 30°, 60°, 90°, 120°, 150°, 179° or any value between 0-180°.

[0131] In some embodiments, the first welding portion 13 extends along the third direction Z, and the extension direction of the second welding portion 14 is not parallel to the third direction Z at all times.

[0132] According to the technical solution of the embodiment of the present application, in the first direction X, the angle α between the orthographic projection of the first welding portion 13 and the orthographic projection of the second welding portion 14 satisfies the above conditions, which can increase the distance between the first welding portion 13 and the second welding portion 14, reduce the thermal impact when forming the first welding portion 13 and the second welding portion 14, and improve the reliability of the battery device 1.

[0133] In some embodiments, 0<α<90°.

[0134] In some embodiments, the angle α between the projection of the first welding portion 13 and the projection of the second welding portion 14 satisfies the condition: 0<α<90°. That is, α can be any value among 1°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 89° or any value between 0-90°.

[0135] In some embodiments, the angle between the projection of the first welding portion 13 and the projection of the second welding portion 14 may be an acute angle. The first welding portion 13 may extend along the third direction Z, and the fifth surface 123 and the third surface 1122 are welded to form the second welding portion 14. From one end of the second welding portion 14 facing the accommodation space 15 to the end away from the accommodation space 15, the distance from the first surface 1111 of the body portion 111 gradually decreases.

[0136] In some embodiments, one end of the second welding portion 14 facing away from the receiving space 15 may be connected to the first surface 1111 .

[0137] In some embodiments, the thickness of the second wall 12 may be greater than the thickness of the protrusion 112. The thickness of the second wall 12 is the dimension of the second wall 12 in the second direction Y, and the thickness of the protrusion 112 is the dimension of the protrusion 112 in the first direction X. The second welding portion 14 extends along the second direction Y, and the greater the thickness of the second wall 12, the greater the distance between the end of the second welding portion 14 away from the accommodation space 15 and the first welding portion 13, and the smaller the degree of heat influence.

[0138] According to the technical solution of the embodiment of the present application, in the first direction X, the angle α between the projection of the first welding portion 13 and the projection of the second welding portion 14 meets the above conditions, thereby reducing the influence of the groove 121 on the structural strength of the second wall 12 .

[0139] Please refer to Fig. 9 , Fig. 9 Schematic diagram of the first welding part and the second welding part provided in some other embodiments of the present application. In order to facilitate the display of the first welding part and the second welding part, Fig. 9 The first wall is partially hidden in the embodiment. In some embodiments, α=90°.

[0140] In some embodiments, the angle α between the projection of the first welding portion 13 and the projection of the second welding portion 14 is 90°, the extension direction of the first welding portion 13 can be parallel to the third direction Z, and the extension direction of the second welding portion 14 can be parallel to the second direction Y.

[0141] In the technical solution of the embodiment of the present application, in the first direction X, the angle α between the projection of the first welding portion 13 and the projection of the second welding portion 14 meets the above conditions, which is beneficial to the processing and manufacturing of the groove 121 of the second wall 12.

[0142] Please refer to Figure 3 In some embodiments, the number of the grooves 121 is two, and the two grooves 121 are disposed at both ends of the second wall 12 in the first direction X. The number of the protrusions 112 is two, and the two protrusions 112 are disposed at both ends of the body 111 in the first direction X. One protrusion 112 is correspondingly disposed in one groove 121.

[0143] In some embodiments, grooves 121 are provided at both ends of the second wall 12 in the first direction X, and protrusions 112 are provided at both ends of the main body 111 in the first direction X, wherein one protrusion 112 is provided in one of the grooves 121 , and the other protrusion 112 is provided in the other groove 121 .

[0144] In some embodiments, the two grooves 121 are disposed at two ends of the second wall 12 in the first direction X, and the two grooves 121 may be symmetrically disposed relative to an axis of the second wall 12 in the third direction Z.

[0145] In some embodiments, two grooves 121 are disposed at two ends of the second wall 12 in the first direction X. The structures and sizes of the two grooves 121 may be the same or different.

[0146] The technical solution of the embodiment of the present application provides two grooves 121 to cooperate with the two protrusions 112 to improve the reliability of the connection between the first wall 11 and the second wall 12 and improve the reliability of the battery device 1 .

[0147] Please refer to Figure 3 In some embodiments, the number of the second walls 12 is two, and the two second walls 12 are spaced apart along the second direction Y. The protrusion 112 extends along the second direction Y, and the two ends of the protrusion 112 in the second direction Y are respectively corresponding to the grooves 121 of the two second walls 12 .

[0148] In some embodiments, the two second walls 12 are spaced apart along the second direction Y, and the battery cell assembly 20 is located between the two second walls 12 .

[0149] In some embodiments, the number of second walls 12 can be two, the protrusion 112 can extend along the second direction Y, one end of the protrusion 112 in the second direction Y cooperates with the groove 121 of one of the second walls 12, and the other end of the protrusion 112 in the second direction Y cooperates with the groove 121 of the other second wall 12.

[0150] In some embodiments, the number of the second walls 12 may be two, and the two second walls 12 are spaced apart along the second direction Y, and the second walls 12 may be provided with grooves 121 at both ends in the first direction X. The number of the protrusions 112 may be two, and the two protrusions 112 are respectively provided at both ends of the body 111 in the first direction X, and the protrusions 112 extend along the second direction Y.

[0151] One end of a protrusion 112 in the first direction X can be disposed in a groove 121 at one end of a second wall 12 , and the other end of a protrusion 112 in the first direction X can be disposed in a groove 121 at one end of another second wall 12 .

[0152] One end of the other protrusion 112 in the first direction X can be disposed in the groove 121 at the other end of one second wall 12 , and the other end of the other protrusion 112 in the first direction X can be disposed in the groove 121 at the other end of the other second wall 12 .

[0153] In some embodiments, the grooves 121 of the two second walls 12 may be the same or different.

[0154] For example, one end of the protrusion 112 is disposed in the groove 121 of one second wall 12 to form the first welding portion 13 and the second welding portion 14, and the angle between the projection of the first welding portion 13 and the projection of the second welding portion 14 can be less than 90°. The other end of the protrusion 112 is disposed in the groove 121 of another second wall 12 to form the first welding portion 13 and the second welding portion 14, and the angle between the projection of the first welding portion 13 and the projection of the second welding portion 14 can be equal to 90°.

[0155] In the technical solution of the embodiment of the present application, the two second walls 12 are spaced apart along the second direction Y and connected to the two ends of the protrusion 112 in the second direction Y, thereby improving the reliability of the box body 10 and the reliability of the battery device 1 .

[0156] An embodiment of the present application further provides an electrical device, comprising the battery device 1 of any of the above embodiments, wherein the battery device 1 is used to provide electrical energy.

[0157] Please refer to Figures 3 to 7In some embodiments, the box body 10 of the battery device 1 includes a first wall 11 and a second wall 12, the first wall 11 includes a main body 111 and a protrusion 112, one end of the second wall 12 in the third direction Z is connected to the first surface 1111, and the first surface 1111 is the surface of the main body 111 in the third direction Z.

[0158] In some embodiments, the protrusion 112 is protruded from the first surface 1111. The protrusion 112 has a second surface 1121 and a third surface 1122 that are oppositely arranged in the first direction X, the second surface 1121 is welded with the second wall 12 to form a first welding portion 13, the third surface 1122 is welded with the second wall 12 to form a second welding portion 14, and with the first direction X as the projection direction, one end of the projection of the first welding portion 13 in the third direction Z and one end of the projection of the second welding portion 14 in the second direction Y intersect, and the other parts of the projection of the first welding portion 13 and the other parts of the projection of the second welding portion 14 do not overlap.

[0159] According to the technical solution of the embodiment of the present application, in the first direction X, the projection of the first welding portion 13 and the projection of the second welding portion 14 do not overlap, thereby reducing the mutual thermal influence between the welding of the second surface 1121 and the second wall 12, and the welding of the third surface 1122 and the second wall 12, improving the quality of the first welding portion 13 and the second welding portion 14, improving the reliability of the connection between the first wall 11 and the second wall 12, improving the reliability of the box body 10, and thus improving the reliability of the battery device 1.

[0160] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: The invention comprises a box body and a battery monomer assembly arranged in the box body, wherein the box body comprises: A first wall, comprising a main body and a protruding portion, wherein the main body has a first surface for supporting the battery cell assembly, and the protruding portion is protruding from the first surface; a second wall, disposed on the first surface, the second wall being provided with a groove, at least a portion of the protrusion being disposed in the groove; In which, the protrusion has a second surface and a third surface arranged opposite to each other along a first direction, the first direction is perpendicular to the third surface, along the first direction, the second surface is closer to the center of the first surface than the third surface, the second surface is welded to the second wall to form a first welding portion, and the third surface is welded to the second wall to form a second welding portion, and on the same projection plane perpendicular to the first direction, the orthographic projection of the first welding portion and the orthographic projection of the second welding portion at least partially do not overlap.

2. The battery device according to claim 1, characterized in that: The second wall has a fourth surface and a fifth surface connected to each other, the first surface, the second surface and the fourth surface together enclose a receiving space, and the receiving space is used to receive the battery monomer assembly; The fourth surface and the second surface are welded to form the first welding portion, and the fifth surface and the third surface are welded to form the second welding portion.

3. The battery device according to claim 2, characterized in that: The second wall also has a sixth surface, which is arranged opposite to the fourth surface in the second direction, the fifth surface connects the sixth surface and the fourth surface, the second welding portion extends from the fourth surface to the sixth surface, and the second direction is parallel to the thickness direction of the second wall.

4. The battery device according to claim 2, characterized in that: The second wall further has a seventh surface, the seventh surface is connected to the first surface, and the seventh surface is connected to the fourth surface and the fifth surface, and the groove is arranged at the intersection of the fourth surface, the fifth surface and the seventh surface.

5. The battery device according to claim 2, characterized in that: The fifth surface is coplanar with the third surface.

6. The battery device according to claim 1, characterized in that: The first welding portion extends along a third direction, the third direction is parallel to a thickness direction of the first wall, and the first direction and the second direction are perpendicular to the third direction in pairs.

7. The battery device according to claim 1, characterized in that: Taking the first direction as a projection direction, an extension direction of the projection of the first welding portion intersects with a thickness direction of the first wall.

8. The battery device according to claim 1, characterized in that: On the same projection plane perpendicular to the first direction, the orthographic projection of the first welding part and the orthographic projection of the second welding part are set at an angle, and the angle between the orthographic projection of the first welding part and the orthographic projection of the second welding part is α, satisfying: 0<α<180°.

9. The battery device according to claim 8, characterized in that: 0＜α＜90°。 10. The battery device according to claim 8, characterized in that: α＝90°。 11. The battery device according to claim 1, characterized in that: The number of the grooves is two, and the two grooves are arranged at two ends of the second wall in the first direction; The number of the protrusions is two, and the two protrusions are arranged at two ends of the main body in the first direction; Wherein, one of the protrusions is correspondingly arranged in one of the grooves.

12. The battery device according to claim 1, characterized in that: The number of the second walls is two, and the two second walls are spaced apart along the second direction; The protruding portion extends along the second direction, and two ends of the protruding portion in the second direction are respectively correspondingly arranged at the grooves of the two second walls.

13. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy.

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