Battery and electric device

Abstract

The invention discloses a battery and an electric device, and belongs to the technical field of batteries. The battery comprises a single battery, a first box body and a second box body, the first box body comprises a first end wall, the second box body and the first box body jointly define a closed space used for containing the single battery, the second box body comprises a second end wall and two third side walls, and the second end wall and the first end wall are oppositely arranged in the first direction; the two third side walls are oppositely arranged in the third direction and connected to the second end wall. The third side wall comprises a third surface facing the closed space, a fourth surface deviating from the closed space and a second side surface connecting the third surface and the fourth surface; the second side face comprises a flat straight face and a transition face which are used for being connected with the first box body in a sealed mode, and the flat straight face and the transition face are connected and are in smooth transition. Due to the design, the battery has relatively high sealing performance and reliability.

Description

[0001] This application is a divisional application based on the invention with application number 2023800272450, application date December 28, 2023, applicant CATL, and invention title "Battery and Power Consumption Device". Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and 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.

[0004] In the development of battery technology, how to improve battery reliability is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] In view of the above problems, this application provides a battery and an electrical device that can improve the reliability of the battery.

[0006] In a first aspect, this application provides a battery, which includes a battery cell, a first housing, and a second housing. The first housing includes a first end wall. The second housing and the first housing together form a closed space for accommodating the battery cell. The second housing includes a second end wall and two third side walls. The second end wall and the first end wall are disposed opposite each other along a first direction, and the two third side walls are disposed opposite each other along a third direction and connected to the second end wall. The third side wall includes a third surface facing the closed space, a fourth surface facing away from the closed space, and a second side surface connecting the third surface and the fourth surface. The second side surface includes a straight surface and a transition surface for sealing connection with the first housing, and the straight surface and the transition surface are connected and smoothly transitioned.

[0007] In the technical solution of this application embodiment, the second side includes a straight surface and a transition surface for sealing connection with the first housing, and the straight surface and the transition surface are connected and smoothly transitioned. This design can form a good sealing surface when the first housing and the second housing are connected, reducing the risk of seal failure after the first housing and the second housing are connected, and the battery has high sealing performance, thereby improving the reliability of the battery.

[0008] In some embodiments, the flat surface includes a first flat surface and a second flat surface. The first flat surface is disposed at one end of the third sidewall away from the second endwall. The two second flat surfaces are respectively disposed at both ends of the third sidewall along the second direction. A transition surface connects the first flat surface and the second flat surface so that the first flat surface and the second flat surface transition smoothly. The second direction, the first direction and the third direction intersect each other.

[0009] In the above scheme, the first flat surface and the second flat surface are non-coplanar surfaces, and the transition surface connects the first flat surface and the second flat surface to make the first flat surface and the second flat surface transition smoothly, which can significantly reduce the risk of sealing failure at the transition position of the first flat surface and the second flat surface.

[0010] In some embodiments, the transition surface is a circular arc transition surface.

[0011] In the above scheme, by setting the transition surface as an arc transition surface, the first flat surface and the second flat surface can be smoothly transitioned, so that the sealing structure can be smoothly set between the third side wall and the first housing, reducing the risk of sealing failure due to stress concentration damage to the sealing structure, which is beneficial to the sealing performance between the second side and the first housing, and improving the sealing performance and reliability of the battery.

[0012] In some embodiments, the transition surface has a first edge in the third direction, the first edge being arc-shaped, and the radius of the first edge being greater than or equal to 10 mm.

[0013] The first edge can correspond to the extension trajectory of the transition surface, or it can refer to the edge of the transition surface parallel to its extension direction. In the above scheme, by defining the first edge of the transition surface as an arc, that is, defining the first edge as an arc line, the transition surface extends in an arc trajectory. And by setting the radius of the first edge to be greater than or equal to 10mm, the first flat surface and the second flat surface can be smoothly transitioned. This allows the sealing structure to be smoothly set between the third side wall and the first housing, effectively reducing the risk of sealing failure due to stress concentration damage to the sealing structure. This is beneficial to the sealing performance between the second side wall and the first housing, and improves the sealing performance and reliability of the battery.

[0014] In some embodiments, the transition surface includes a first transition surface and a second transition surface that are connected to each other. The first transition surface has a straight edge in the third direction, and the second transition surface has an arc-shaped edge in the third direction.

[0015] In the above scheme, by setting a first transition surface and a second transition surface, on the one hand, the first flat surface and the second flat surface can be smoothly transitioned, which is conducive to improving the sealing performance between the second side and the first housing, and improving the sealing performance and reliability of the battery; on the other hand, the first transition surface can provide a flat surface for the locking of the third side wall and the first housing, so that the locking component (such as bolt) can stably and with good sealing performance pass through the first housing and lock in the first transition surface, thereby improving the structural stability of the battery and making the battery have high reliability.

[0016] In some embodiments, the number of first transition surfaces is n, where n≥1, and the number of second transition surfaces is n+1; any one of the first transition surfaces is disposed between two adjacent second transition surfaces.

[0017] In the above scheme, by setting the number of second transition surfaces to be one more than the number of first transition surfaces, and by placing any one of the first transition surfaces between two adjacent second transition surfaces, on the one hand, the first flat surface and the second flat surface can be smoothly transitioned, that is, the transition surfaces connected to the first flat surface and the second flat surface are all arc-shaped second transition surfaces, reducing the risk of sealing failure caused by sharp corners formed between flat surfaces. On the other hand, by setting the first transition surfaces, multiple locking positions can be provided between the third side wall and the first housing, which is conducive to the effective connection of the locking components between the third side wall and the first housing, improving the structural stability of the battery and making the battery more reliable.

[0018] In some embodiments, the length of the first transition surface is greater than or equal to 6 mm.

[0019] In the above scheme, by setting the length of the first transition surface to be greater than or equal to 6mm, one or more locking positions can be set on the first transition surface, which is conducive to the effective connection of the locking component between the third side wall and the first housing, improving the structural stability of the battery and making the battery have high reliability.

[0020] In some embodiments, the flat surface includes two second flat surfaces, which are respectively disposed at both ends of the third sidewall along the second direction. The ends of the two second flat surfaces opposite to the second endwall are connected by a transition surface, and the second direction, the first direction, and the third direction intersect each other.

[0021] In the above scheme, the smooth transition between the two oppositely arranged second flat surfaces through the arc surface can facilitate the formation of a good sealing surface between the first housing and the second side, thus giving the battery a high degree of sealing performance.

[0022] In some embodiments, the second end wall has a first side surface in the second direction, the second direction, the first direction, and the third direction intersect each other, and the second straight surface is flush with the first side surface.

[0023] In the above solution, the second flat surface is flush with the first side surface, which can reduce the risk of gaps between the first sidewall and the second side surface, reduce the risk of gaps between the connecting part and the second flat surface, and thus improve the battery's sealing performance.

[0024] In some embodiments, the second end wall includes a first portion and a second portion, wherein the second portion is located on one side of the first portion and connected to the first portion along a third direction. The dimension of the first portion in the second direction is larger than the dimension of the second portion in the second direction.

[0025] In the above scheme, the second end wall includes a first part and a second part. By setting the dimension of the first part in the second direction to be larger than the dimension of the second part in the second direction, a gap is formed between the first part and the second part, or in other words, the end of the second end wall is narrowed. Since the end of the second end wall is not used by the battery cell, narrowing this part can reduce the volume of the battery and save battery installation space, and can also achieve the effect of battery weight reduction, making the battery lighter.

[0026] In some embodiments, the second portion has a third side surface in the second direction, the third side surface being flush with the second flat surface.

[0027] In the above solution, by setting the second flat surface to be flush with the third side surface of the second part, the sealing between the third side wall and the second end wall and the first housing is improved, reducing the risk of the first housing and the second housing failing to seal due to gaps generated at the second part by the third side wall and the second end wall, thus making the battery more reliable.

[0028] In some embodiments, the first portion has a fourth side surface in the second direction, and the fourth side surface protrudes from the third side surface along the second direction.

[0029] In the above scheme, along the third direction, the fourth side protrudes from the third side, which allows the first and second boxes to form a gap at the part corresponding to the third and fourth sides, or it can be understood that the first and second boxes narrow at this part. On the one hand, it can reduce the volume of the battery and save the battery installation space, and on the other hand, it can achieve the effect of battery weight reduction, making the battery lightweight.

[0030] In some embodiments, the first part has a third flat surface in a third direction, and along the second direction, one end of the third flat surface is connected to a third side surface by an arc transition, and the other end of the third flat surface is connected to a fourth side surface by an arc transition.

[0031] In the above scheme, a third flat surface is provided between the third side and the fourth side. By setting the third flat surface to be connected to the third side with an arc transition at one end and to the fourth side with an arc transition at the other end, the risk of damage to the sealing structure between the second end wall, the third side wall and the first housing due to stress concentration can be reduced, which is beneficial to the sealing performance between the first housing and the second housing, and makes the battery have high reliability.

[0032] In some embodiments, the second end wall has a first side surface in the second direction, and the flat surface includes a first flat surface. The first flat surface is disposed at one end of the third side wall away from the second end wall, and the end of the first flat surface smoothly transitions to the first side surface through a transition surface. The second direction, the first direction, and the third direction intersect each other.

[0033] In the above scheme, the flat surface includes a first flat surface and a transition surface. The first flat surface can form a good seal with the first housing. By setting a transition surface between the side surfaces of the first flat surface and the second end wall, the side surfaces of the first flat surface and the second end wall can be smoothly transitioned, which can facilitate the formation of a good sealing surface between the first housing and the second housing, so that the battery has high sealing performance.

[0034] In some embodiments, the second end wall has a first side surface in the second direction, and the first housing also includes a first side wall, one end of which is connected to the first end wall and the other end of which is connected to the first side surface, and the second direction, the first direction and the third direction intersect each other.

[0035] In the above solution, the connection between the first and second housings is achieved by connecting one end of the first side wall of the first housing to the first side of the second housing. This connection can be achieved without setting a flange structure protruding in the second direction, thereby improving the space utilization rate of the battery in the second direction, so as to accommodate more battery cells or reduce the volume of the battery, and thus improve the volumetric energy density of the battery.

[0036] In some embodiments, the inner surface of the first sidewall is connected to the first side surface.

[0037] In the above scheme, by connecting the inner surface of the first sidewall (i.e. the surface of the first sidewall facing the first side) to the first side, the size of the battery in the second direction can be effectively reduced, so as to maximize the volumetric energy density of the battery.

[0038] In some embodiments, the second end wall has a first surface facing the first end wall, and in a direction from the first end wall to the second end wall, one end of the first side wall extends beyond the first surface away from the first end wall.

[0039] In the above scheme, the end of the first sidewall that is away from the first end plate extends beyond the first surface, which can enable the first sidewall to be directly connected to the first side. On the one hand, it can effectively reduce the assembly difficulty and manufacturing cost caused by the indirect connection between the first sidewall and the first side through the intermediate connector. On the other hand, the inner surface of the part of the first endwall that extends beyond the first surface can be connected to the first side, which can effectively reduce the size of the battery in the second direction, so as to maximize the volumetric energy density of the battery.

[0040] In some embodiments, the second end wall has a second surface facing away from the first end wall, and in the direction from the first end wall to the second end wall, the end of the first side wall away from the first end wall does not extend beyond the second surface.

[0041] In the above scheme, the end of the first sidewall that is away from the first endwall does not extend beyond the second surface, so that the size of the battery in the first direction is controlled, and the battery has a high volumetric energy density.

[0042] In some embodiments, the battery further includes a first fastener, through which the first sidewall is connected to the first side surface.

[0043] In the above solution, by setting a first fastener to connect the first sidewall and the first side surface, the connection between the first sidewall and the first side surface is made more stable, thereby improving the structural stability of the battery.

[0044] In some embodiments, a first through hole is provided on the first sidewall, a first threaded hole is provided on the first side surface, and a first fastener passes through the first through hole and is connected to the first threaded hole.

[0045] In the above scheme, the first fastener can be a connecting component with external threads, such as a bolt or screw, which can be effectively connected to the first threaded hole, improving the connection stability between the first sidewall and the first side surface and ensuring good sealing between the first sidewall and the first side surface.

[0046] In some embodiments, the battery further includes a first seal disposed between a first sidewall and a first side surface.

[0047] In the above solution, by providing a first sealing element between the first sidewall and the first side surface, the sealing performance between the first sidewall and the first side surface can be improved, thereby improving the sealing performance of the battery.

[0048] In some embodiments, there are two first sidewalls, which are disposed opposite to each other along a second direction; a second endwall is located between the two first sidewalls, and the second endwall has two first side surfaces disposed opposite to each other along the second direction; the first side surfaces and the first sidewalls correspond one to one.

[0049] In the above scheme, there are two first sidewalls arranged opposite each other along the second direction and connected to the corresponding first sidewalls, which can effectively improve the space utilization of the battery in the second direction, thereby improving the volumetric energy density of the battery.

[0050] In some embodiments, the second housing further includes two second sidewalls, which are disposed opposite to each other along a second direction and connected to the second end wall, and the battery cell is disposed between the two second sidewalls.

[0051] In the above scheme, two opposing second sidewalls are provided on the second end wall along the second direction. On the one hand, this can improve the structural strength of the second housing. On the other hand, it can define the installation area of ​​the battery cells, so that the battery cells can be stably assembled in the second housing. Furthermore, since the second sidewalls protrude from the surface of the second end wall, when the battery cells are glued to the second housing, the overflow space can be effectively controlled, reducing the risk of waste and environmental pollution caused by glue overflow.

[0052] In some embodiments, the first housing has openings at both ends along a third direction, and the two third sidewalls respectively close the two openings.

[0053] In the above solution, by setting a third sidewall, on the one hand, components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors can be installed on the third sidewall, so that the battery can charge and discharge normally; on the other hand, compared with the flange structure that is set between the first and second housings and protrudes in the third direction, by setting a third sidewall to close the opening, the space utilization rate of the battery in the third direction can be improved, and the volumetric energy density of the battery can be increased.

[0054] In some embodiments, the dimension of one of the third sidewalls along the first direction is smaller than the dimension of the other third sidewall along the first direction.

[0055] In the above scheme, the larger third sidewall can be used to install components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors, so that the battery can charge and discharge normally. By reducing the size of the other third sidewall, the size of the first housing corresponding to the third sidewall can be adaptively increased, thereby increasing the proportion of the battery in the first housing (in this embodiment, the first housing can be the upper housing with lower material cost and density), thereby reducing the manufacturing cost of the battery and increasing the weight energy density of the battery.

[0056] In some embodiments, the first housing includes two connecting portions located at both ends of the first housing along a third direction, forming an opening, and the connecting portions are connected to a second side.

[0057] In the above solution, by setting a connecting part to connect with the second side of the third sidewall, the connection stability and sealing of the first and second housings can be improved.

[0058] In some embodiments, the first housing further includes a fourth sidewall, which is adjacent to the first sidewall. One end of the fourth sidewall is connected to the first endwall, and the connection portion protrudes from the fourth sidewall in a direction away from the enclosed space.

[0059] In the above scheme, the first box can be the upper box and the second box can be the lower box. In the battery manufacturing process, the material cost and density of the upper box can be lower than those of the lower box. Therefore, by setting a fourth side wall to increase the proportion of the first box in the battery, the manufacturing cost of the battery can be effectively reduced and the weight energy density of the battery can be increased.

[0060] In some embodiments, the battery further includes a second fastener, through which the connecting portion is connected to the second side.

[0061] In the above solution, by setting a second fastener to connect the second side and the connecting part, the connection stability between the connecting part and the second side is improved, thereby improving the structural stability of the battery.

[0062] In some embodiments, the connecting portion is provided with a second through hole, the second side is provided with a second threaded hole, and the second fastener passes through the second through hole and is connected to the second threaded hole.

[0063] In the above scheme, the second fastener can be a connecting component with external threads, such as a bolt or screw, which can be effectively connected to the second threaded hole, improving the connection stability between the connecting part and the second side, and making the connecting part and the second side have good sealing performance.

[0064] In some embodiments, the battery further includes a second seal disposed between the connection portion and the second side.

[0065] In the above solution, by providing a second seal between the connecting part and the second side, the sealing performance between the connecting part and the second side can be improved, thereby improving the sealing performance of the battery.

[0066] In some embodiments, the battery further includes a first seal disposed between a first sidewall and a first side surface. The two ends of the first seal are respectively connected to two second seals.

[0067] In the above solution, the first and second sealing elements can be integrally formed or separately connected. By setting the first and second sealing elements, a good seal can be achieved between the first and second housings, improving the reliability of the battery.

[0068] In some embodiments, the second end wall is provided with a mounting portion for mounting the battery to the power device.

[0069] In the above scheme, a mounting part is provided on the second end wall to achieve stable battery assembly, so that the battery can stably provide power.

[0070] In some embodiments, the material density of the first housing is less than that of the second housing.

[0071] In the above scheme, since the first sidewall is connected to the first side, the proportion of the battery in the first housing is increased, and the material density of the first housing is smaller than that of the second housing, so the density of the battery is reduced. Under the same volume, the weight of the battery is reduced, thereby increasing the weight energy density of the battery.

[0072] In some embodiments, the first housing is made of plastic, and the second housing is made of aluminum alloy.

[0073] In the above design, the first housing can be the upper housing of the battery, and the second housing can be the lower housing. The second housing is made of aluminum alloy, which gives it high structural strength and rigidity, providing excellent protection for the battery cells. The first housing, as the upper housing, seals the battery cells between the upper and lower housings. Its plastic construction effectively reduces battery manufacturing costs and weight, thereby increasing the battery's gravimetric energy density.

[0074] In some embodiments, the second end wall is used to carry a battery cell.

[0075] In the above scheme, the second end wall can serve as an assembly base when assembling battery cells, which facilitates the assembly of battery cells.

[0076] Secondly, this application also provides an electrical device including a battery as described in any of the first aspects, the battery being used to provide electrical energy.

[0077] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0078] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0079] Figure 1 This is a schematic diagram of a vehicle according to some embodiments of this application;

[0080] Figure 2 This is a schematic diagram of a battery in some embodiments of this application;

[0081] Figure 3 This is an exploded perspective view of the battery in some embodiments of this application;

[0082] Figure 4This is a schematic diagram of the first housing in some embodiments of this application;

[0083] Figure 5 This is a schematic diagram of the second housing in some embodiments of this application;

[0084] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0085] Figure 7 This is a partial schematic diagram of the first housing in some embodiments of this application;

[0086] Figure 8 This is a schematic diagram of the third sidewall in some embodiments of this application;

[0087] Figure 9 This is a schematic diagram of the first flat surface, the second flat surface, and the transition surface in some embodiments of this application;

[0088] Figure 10 This is a schematic diagram of the third sidewall in some other embodiments of this application;

[0089] Figure 11 This is a partial schematic diagram of the second housing in some other embodiments of this application;

[0090] Figure 12 This is a partial structural diagram of the second housing in some other embodiments of this application;

[0091] Figure 13 This is a partial schematic diagram of the first housing in some other embodiments of this application;

[0092] Figure 14 This is a partial schematic diagram of the second housing in some embodiments of this application;

[0093] Figure 15 This is a schematic diagram of the second housing in some other embodiments of this application;

[0094] Figure 16 This is a partial schematic diagram of the first housing in some embodiments of this application.

[0095] Icons: 100-Battery; 1000-Vehicle; 200-Controller; 300-Motor; 10-First housing; 11-First end wall; 12-First side wall; 120-First through hole; 13-Opening; 14-Connecting part; 140-Second through hole; 15-Fourth side wall; 20-Second housing; 21-Second end wall; 210-First side surface; 2100-First threaded hole; 211-First surface; 212-Second surface; 213-First part; 2130-Fourth side surface; 2131-Third flat surface; 214-Second part; 2 140 - Third side surface; 22 - Second side wall; 23 - Third side wall; 230 - Third surface; 231 - Fourth surface; 232 - Second side surface; 2320 - First flat surface; 2321 - Second flat surface; 2322 - Transition surface; 2322a - First transition surface; 2322b - Second transition surface; 23220 - First edge; 2324 - Arc surface; 2323 - Second threaded hole; 24 - Crossbeam; 30 - First seal; 31 - Second seal; 40 - Mounting part; z - First direction; x - Second direction; y - Third direction. Detailed Implementation

[0096] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0097] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0098] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0099] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0100] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0101] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0102] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0103] In this application, the battery cell may include, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of the battery cell may include, but is not limited to, cylinders, flat bodies, cuboids, or other shapes. According to the packaging method, the battery cell may include, but is not limited to, cylindrical battery cells, cuboid battery cells, blade battery cells, and pouch battery cells.

[0104] In high-power applications such as electric vehicles, battery applications involve three levels: individual battery cells, battery modules, and the battery itself. A battery module is formed by electrically connecting a number of individual battery cells and placing them in a frame to protect them from external shocks, heat, vibration, etc. The battery refers to the final state of the battery system installed in an electric vehicle. In the embodiments of this application, the battery refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity.

[0105] A battery typically includes a first housing and a second housing, which are connected to form a closed space. The battery cells are placed inside the closed space to reduce the risk of liquids or other foreign objects affecting the charging or discharging of the battery cells.

[0106] After assembly, the surfaces of the first and second housings that come into contact with each other are generally sealing surfaces. Sealing structures are usually provided on the sealing surfaces to improve the sealing performance of the first and second housings.

[0107] In the development of battery technology, improving battery reliability is a pressing technical problem that needs to be solved. Sealing surfaces typically consist of multiple surfaces, and the junctions between adjacent surfaces often form sharp angles. The presence of these angles increases the risk of seal failure at these junctions, thus reducing battery reliability.

[0108] In view of this, this application provides a battery, which includes a battery cell, a first housing, and a second housing. The first housing includes a first end wall. The second housing and the first housing together form a closed space for accommodating the battery cell. The second housing includes a second end wall and two third side walls. The second end wall and the first end wall are disposed opposite each other along a first direction, and the two third side walls are disposed opposite each other along a third direction and connected to the second end wall. The third side wall includes a third surface facing the closed space, a fourth surface facing away from the closed space, and a second side surface connecting the third surface and the fourth surface. The second side surface includes a straight surface and a transition surface for sealing connection with the first housing, and the straight surface and the transition surface are connected and smoothly transitioned. This design can form a good sealing surface when the first housing and the second housing are connected, reducing the risk of seal failure after the first housing and the second housing are connected, resulting in higher battery sealing performance and thus improving battery reliability.

[0109] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries, and electrical devices that use batteries.

[0110] Electrical equipment includes, but is not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0111] The batteries disclosed in this application can be used, but are not limited to, in battery cabinets, containerized energy storage devices, etc. An energy storage device may include multiple batteries disclosed in this application.

[0112] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using batteries disclosed in this application.

[0113] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0114] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0115] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The type of vehicle 1000 can be a sedan, SUV, heavy truck, or bus, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0116] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0117] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0118] To meet different power demands, battery 100 may include multiple battery cells, which can be connected in series, parallel, or a combination of both. Battery 100 can also be referred to as a battery pack. Optionally, multiple battery cells can first be connected in series, parallel, or a combination of both to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination of both to form battery 100. That is, multiple battery cells can be directly assembled into battery 100, or they can first be assembled into battery modules, and then the battery modules can be assembled into battery 100.

[0119] For example, please refer to Figure 2 The battery 100 may include multiple battery cells (not shown in the figure). The battery 100 may also include a housing with a sealed chamber inside, in which the multiple battery cells are housed. Figure 3 As shown, the enclosure includes a first enclosure 10 and a second enclosure 20, which are fastened together. The shapes of the first enclosure 10 and the second enclosure 20 can be determined based on the shape of the combination of multiple battery cells. Both the first enclosure 10 and the second enclosure 20 can have an opening 13, or they can be a frame structure composed of multiple walls. For example, please refer to... Figure 3The first housing 10 may include three walls forming a U-shaped frame, with two openings 13 at both ends along the length of the first housing 10. The second housing 20 may also include three walls forming another U-shaped frame, with two opposing walls along the length of the second housing 20 corresponding one-to-one with the openings 13 and used to close their corresponding openings 13. The two U-shaped frames are interlocked to form a housing with a closed chamber. Multiple battery cells are connected in parallel, series, or mixed and placed within the closed chamber.

[0120] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery may also include a busbar component for electrically connecting multiple battery cells, such as in parallel, series, or mixed connections. Specifically, the busbar component can achieve electrical connection between battery cells by connecting the electrode terminals of the battery cells. Further, the busbar component can be fixed to the electrode terminals of the battery cells by welding. The electrical energy of the multiple battery cells can be further led out through the housing via a conductive mechanism.

[0121] The number of battery cells can be set to any value depending on different power requirements. Multiple battery cells can be connected in series, parallel, or a combination thereof to achieve a larger capacity or power. Since each battery 100 may contain a large number of battery cells, for ease of installation, the battery cells can be grouped, with each group forming a battery module. The number of battery cells in a battery module is unlimited and can be set according to requirements. Battery 100 may include multiple battery modules, which can be connected in series, parallel, or a combination thereof. Multiple battery cells can also be arranged in groups and bundled together to form one or more battery packs, which are then housed in an enclosed space. Multiple battery packs can be arranged along the length, width, or height of the housing.

[0122] According to some embodiments of this application, please refer to Figures 2-3 , Figures 8-12 , Figure 14 and Figure 15The battery 100 includes a battery cell (not shown in the figure), a first housing 10, and a second housing 20. The first housing 10 includes a first end wall 11. The second housing 20 and the first housing 10 together form a closed space for accommodating the battery cell. The second housing 20 includes a second end wall 21 and two third side walls 23. The second end wall 21 and the first end wall 11 are disposed opposite each other along a first direction z, and the two third side walls 23 are disposed opposite each other along a third direction y and connected to the second end wall 21. The third side wall 23 includes a third surface 230 facing the closed space, a fourth surface 231 facing away from the closed space, and a second side surface 232 connecting the third surface 230 and the fourth surface 231. The second side surface 232 includes a straight surface and a transition surface 2322 for sealing connection with the first housing 10. The straight surface and the transition surface 2322 are connected and smoothly transitioned.

[0123] The flat surface can be the upper surface of the third sidewall 23 in the first direction z, or the outer surface of the third sidewall 23 in the second direction x, etc.

[0124] The flat surface and transition surface 2322 used for sealing connection with the first housing 10 can be understood as at least part of the sealing structure being set on the flat surface and transition surface 2322 after the first housing 10 and the second housing 20 are assembled. The sealing structure can be a seal or a weld, etc.

[0125] The connection and smooth transition between the flat surface and the transition surface 2322 can be understood as a non-right-angle transition between the flat surface and the transition surface 2322.

[0126] The transition surface 2322 can be an arc surface, or a combination of one or more inclined surfaces and one or more arc surfaces.

[0127] In some embodiments, the first housing 10 can be regarded as the upper housing of the battery 100, the first end wall 11 can be regarded as the top wall of the battery 100, and the first side wall 12 can be a part that is connected to the first end wall 11 at one end and is not on the same plane as the first end wall 11. The first side wall 12 can be connected to the first end wall 11 by welding, bonding or bolting, etc., and the first side wall 12 can also be integrally formed with the first end wall 11.

[0128] The second housing 20 can be considered as the lower housing of the battery 100, and the second end wall 21 can be considered as the bottom wall of the battery 100. The first direction z can be the height direction of the battery 100, that is, the top wall and the bottom wall are set opposite each other along the height direction of the battery 100. The first direction z can also be understood as the direction of gravity.

[0129] The first housing 10 and the second housing 20 are connected to each other to form a closed space that can accommodate individual battery cells.

[0130] The intersection of the first direction z and the second direction x can mean that the first direction z and the second direction x are not parallel.

[0131] In the technical solution of this application embodiment, the second side surface 232 includes a straight surface and a transition surface 2322 for sealing connection with the first housing 10. The straight surface and the transition surface 2322 are connected and smoothly transitioned. This design can form a good sealing surface when the first housing 10 and the second housing 20 are connected, reducing the risk of sealing failure after the first housing 10 and the second housing 20 are connected. The battery 100 has high sealing performance, thereby improving the reliability of the battery 100.

[0132] According to some embodiments of this application, please refer to Figures 8-11 The flat surface includes a first flat surface 2320 and a second flat surface 2321. The first flat surface 2320 is disposed at one end of the third side wall 23 away from the second end wall 21. The two second flat surfaces 2321 are respectively disposed at both ends of the third side wall 23 along the second direction x. The transition surface 2322 connects the first flat surface 2320 and the second flat surface 2321 so that the first flat surface 2320 and the second flat surface 2321 transition smoothly. The second direction x, the first direction z and the third direction y intersect each other.

[0133] The first flat surface 2320 can be the upper surface of the third sidewall 23, and it can be a flat surface. The second flat surface 2321 can be the outer surface of the third sidewall 23, and it can be a flat surface. In some embodiments, the first flat surface 2320 and the second flat surface 2321 are perpendicular to each other. The transition surface 2322 is the portion connecting the first flat surface 2320 and the second flat surface 2321, which enables a smooth transition between the first flat surface 2320 and the second flat surface 2321. A smooth transition can refer to a non-right-angle transition relationship between the first flat surface 2320 and the second flat surface 2321.

[0134] In some embodiments, the transition surface 2322 can be an arc surface, or a combination of one or more inclined surfaces and one or more arc surfaces.

[0135] In the above scheme, the first flat surface 2320 and the second flat surface 2321 are non-coplanar surfaces, and the transition surface 2322 connects the first flat surface 2320 and the second flat surface 2321 so that the first flat surface 2320 and the second flat surface 2321 transition smoothly, which can significantly reduce the risk of sealing failure at the transition position of the first flat surface 2320 and the second flat surface 2321.

[0136] According to some embodiments of this application, see Figure 9 The transition surface 2322 is a circular arc transition surface.

[0137] The transition surface 2322 is a circular arc transition surface, which can be understood as the entire transition surface 2322 being a circular arc transition surface.

[0138] An arc transition surface can refer to a surface that extends along an arc-shaped trajectory. The transition surface 2322 being an arc transition surface can be understood as the first flat surface 2320 and the second flat surface 2321 being connected by an arc surface 2324, that is, the first flat surface 2320 and the second flat surface 2321 may not have any sharp corners.

[0139] In some embodiments, a sealing structure may be provided between the first housing 10 and the second housing 20 to ensure a sealed connection between them. For example, a second seal 31 may be provided between the second side 232 and the first housing 10 (see...). Figure 3 The second seal 31 can be supported by the transition surface 2322. Since the first flat surface 2320 and the second flat surface 2321 are transitioned by the arc surface 2324, the risk of stress concentration in the second seal 31 is small.

[0140] In the above scheme, by setting the transition surface 2322 as an arc transition surface, the first flat surface 2320 and the second flat surface 2321 can be smoothly transitioned, so that the sealing structure can be gently set between the third side wall 23 and the first housing 10, reducing the risk of sealing failure due to stress concentration damage to the sealing structure, which is beneficial to the sealing performance between the second side 232 and the first housing 10, and improving the sealing performance and reliability of the battery 100.

[0141] According to some embodiments of this application, the transition surface 2322 has a first edge in the third direction y, the first edge is arc-shaped, and the radius of the first edge is greater than or equal to 10 mm.

[0142] The first edge 23220 may correspond to the extension trajectory of the transition surface 2322, and the first edge 23220 may also refer to the edge of the transition surface 2322 parallel to its extension direction. In some embodiments, one end of the first edge 23220 is connected to the first flat surface 2320, and the other end is connected to the second flat surface 2321.

[0143] In some embodiments, the first edge 23220 can be an arc, and the radius of the first edge 23220 is greater than or equal to 10 mm. For example, the first edge 23220 can be 10 mm, 11 mm, 12 mm, 13 mm or larger.

[0144] In some embodiments, rounding the first flat surface 2320 and the second flat surface 2321 can form a transition surface 2322 with an arc shape.

[0145] In the above scheme, by defining the first edge of the transition surface 2322 as an arc, that is, defining the first edge as an arc line, the transition surface 2322 extends in an arc trajectory, and the radius of the first edge is set to be greater than or equal to 10mm, so that the first flat surface 2320 and the second flat surface 2321 can be smoothly transitioned. This allows the sealing structure to be smoothly set between the third side wall 23 and the first housing 10, effectively reducing the risk of sealing failure due to stress concentration damage to the sealing structure. This is beneficial to the sealing performance between the second side 232 and the first housing 10, and improves the sealing performance and reliability of the battery 100.

[0146] According to some embodiments of this application, please refer to Figure 8 The transition surface 2322 includes a first transition surface 2322a and a second transition surface 2322b that are connected to each other. The edge of the first transition surface 2322a in the third direction y is straight, and the edge of the second transition surface 2322b in the third direction y is arc-shaped.

[0147] The statement "The edge of the first transition surface 2322a in the third direction y is flat" can be understood as the first transition surface 2322a being a straight surface, with a flat surface, not a curved surface. The statement "The edge of the second transition surface 2322b in the third direction y is arc-shaped" can be understood as the second transition surface 2322b being an arc-shaped surface, with a curved surface.

[0148] The first transition surface 2322a may be provided with a locking position for cooperating with a locking component. For example, the first transition surface 2322a may be provided with a second threaded hole 2323 for cooperating with a locking component (e.g., a second fastener) so that the second side surface 232 is connected to the first housing 10.

[0149] In the above scheme, by setting the first transition surface 2322a and the second transition surface 2322b, on the one hand, the first flat surface 2320 and the second flat surface 2321 can be smoothly transitioned, which is beneficial to improving the sealing performance between the second side surface 232 and the first housing 10, and improving the sealing performance and reliability of the battery 100; on the other hand, the first transition surface 2322a can provide a flat surface for the locking of the third side wall 23 and the first housing 10, so that the locking component (e.g., bolt) can stably and with good sealing performance pass through the first housing 10 and be locked in the first transition surface 2322a, thereby improving the structural stability of the battery 100 and making the battery 100 have high reliability.

[0150] According to some embodiments of this application, please refer to Figure 8 The number of first transition surfaces 2322a is n, n≥1, and the number of second transition surfaces 2322b is n+1; any one of the first transition surfaces 2322a is set between two adjacent second transition surfaces 2322b.

[0151] The number of second transition surfaces 2322b is one more than the number of first transition surfaces 2322a. Any first transition surface 2322a is disposed between two adjacent second transition surfaces 2322b. It can be understood that the first transition surfaces 2322a and the second transition surfaces 2322b are alternately connected, and the part where the transition surface 2322 connects with the first flat surface 2320 and the second flat surface 2321 is the second transition surface 2322b.

[0152] In some embodiments, such as Figure 8 There is one first transition surface 2322a and two second transition surfaces 2322b. The first transition surface 2322a is located between the two second transition surfaces 2322b.

[0153] In some embodiments, the number of first transition surfaces 2322a can be three. When there are three first transition surfaces 2322a, the number of second transition surfaces 2322b is four. In other embodiments, when the number of first transition surfaces 2322a can be other values, such as four, five, or six, the number of second transition surfaces 2322b is always one more than the number of first transition surfaces 2322a, such as five, six, or seven.

[0154] In the above scheme, by setting the number of second transition surfaces 2322b to be one more than the number of first transition surfaces 2322a, and by setting any one of the first transition surfaces 2322a between two adjacent second transition surfaces 2322b, on the one hand, the first flat surface 2320 and the second flat surface 2321 can be smoothly transitioned, that is, the transition surfaces 2322 connected to the first flat surface 2320 and the second flat surface 2321 are all arc-shaped second transition surfaces 2322b, reducing the risk of sealing failure caused by the formation of sharp corners between flat surfaces. On the other hand, by setting the first transition surface 2322a, multiple locking positions can be provided between the third side wall 23 and the first housing 10, which is conducive to the effective connection of the locking components between the third side wall 23 and the first housing 10, improving the structural stability of the battery 100 and making the battery 100 have higher reliability.

[0155] According to some embodiments of this application, the length of the first transition surface 2322a is greater than or equal to 6 mm.

[0156] The length of the first transition surface 2322a is L, and the length direction of the first transition surface 2322a can be perpendicular to the thickness direction of the third sidewall 23.

[0157] The length of the first transition surface 2322a can be 6mm, 7mm, 8mm or a larger value.

[0158] In the above scheme, by setting the length of the first transition surface 2322a to be greater than or equal to 6mm, one or more locking positions can be set on the first transition surface 2322a, which is conducive to the effective connection of the locking component between the third side wall 23 and the first housing 10, improving the structural stability of the battery 100 and making the battery 100 have high reliability.

[0159] According to some embodiments of this application, please refer to Figure 10 The flat surface includes two second flat surfaces 2321, which are respectively disposed at both ends of the third side wall 23 along the second direction x. The ends of the two second flat surfaces 2321 that are away from the second end wall 21 are connected by a transition surface 2322. The second direction x, the first direction z and the third direction y intersect each other.

[0160] The second side surface 232 includes an arc surface 2324 and a straight surface 2321. The two straight surfaces 2321 are respectively disposed at both ends of the third side wall 23 along the second direction x. The ends of the two straight surfaces 2321 that are away from the second end wall 21 are connected by the arc surface 2324.

[0161] The arc surface 2324 can be the upper surface of the third side wall 23. The arc surface 2324 is a curved surface, and the outer edge of the curved surface is arc-shaped. The second flat surface 2321 can be the outer surface of the third side wall 2140, and it can be a flat surface. Multiple locking positions can be provided on the second flat surface 2321, for example, multiple second threaded holes 2323 can be provided to connect the third side wall 23 to the first housing 10.

[0162] In the above scheme, the two oppositely arranged second flat surfaces 2321 are smoothly transitioned by the arc surface 2324, which helps to form a good sealing surface between the first housing 10 and the second side surface 232, so that the battery 100 has high sealing performance.

[0163] According to some embodiments of this application, see Figure 8 The second end wall 21 has a first side surface 210 in the second direction x, and the second direction x, the first direction z and the third direction y intersect each other. The second straight surface 2321 is flush with the first side surface 210.

[0164] The second flat surface 2321 is flush with the first side surface 210. This can mean that the outer side surface of the third side wall 23 in the second direction x is flush with the outer side surface of the second end wall 21 in the second direction x, that is, the surface of the second box 20 in the second direction x is a flat surface.

[0165] In the above solution, the second flat surface 2321 is flush with the first side surface 210, which can reduce the risk of gaps between the first side wall 12 and the second side surface 232, reduce the risk of gaps between the connecting part 14 and the second flat surface 2321, and thus improve the sealing performance of the battery 100.

[0166] According to some embodiments of this application, please refer to Figure 11 and Figure 16 The second end wall 21 includes a first portion 213 and a second portion 214. Along the third direction y, the second portion 214 is located on one side of the first portion 213 and connected to the first portion 213. The dimension of the first portion 213 in the second direction x is larger than the dimension of the second portion 214 in the second direction x.

[0167] The second end wall 21 includes a first portion 213 and a second portion 214. Along the second direction x, the second portion 214 is located on one side of the first portion 213 and connected to the first portion 213. The dimension of the first portion 213 in the second direction x is larger than the dimension of the second portion 214 in the second direction x.

[0168] The second end wall 21 may include a first portion 213 and a second portion 214. The phrase "along the second direction x, the second portion 214 is located on one side of the first portion 213 and connected to the first portion 213" can mean that, in the third direction y, the end of the first portion 213 can be connected to the second portion 214. In some embodiments, in the third direction y, the second portion 214 can be provided at both ends of the first portion 213.

[0169] The statement “the dimension of the first part 213 in the second direction x is greater than the dimension of the second part 214 in the second direction x” can be understood as the dimension of the second end wall 21 in the second direction x being reduced.

[0170] In some embodiments, the first portion 213 may be the part of the second end wall 21 used to support the battery cell, and the second portion 214 may not support the battery cell. For example, along the first direction z, the projection of the battery cell does not fall on the second portion 214.

[0171] In the above scheme, the second end wall 21 includes a first part 213 and a second part 214. By setting the dimension of the first part 213 in the second direction x to be larger than the dimension of the second part 214 in the second direction x, a gap is formed between the first part 213 and the second part 214, or in other words, the end of the second end wall 21 is narrowed. Since the end of the second end wall 21 is not used by the battery cell, by narrowing this part, on the one hand, the volume of the battery 100 can be reduced, saving the installation space of the battery 100, and on the other hand, the weight of the battery 100 can be reduced, making the battery 100 lighter.

[0172] According to some embodiments of this application, please refer to Figure 11 and Figure 16 The second part 214 has a third side surface 2140 in the second direction x, and the third side surface 2140 is flush with the second flat surface 2321.

[0173] The third side surface 2140 is the surface of the second part 214 in the second direction x. The third side surface 2140 may be parallel to the first side surface 210.

[0174] The third side 2140 is flush with the second flat surface 2321, and the dimension of the third side wall 23 in the second direction x can be equal to the dimension of the second part 214 in the second direction x.

[0175] In the above solution, by setting the second flat surface 2321 to be flush with the third side surface 2140 of the second part 214, the sealing between the third side wall 23 and the second end wall 21 and the first housing 10 is improved, reducing the risk of the first housing 10 and the second housing 20 failing to seal due to gaps generated at the second part 214 by the third side wall 23 and the second end wall 21, thus making the battery 100 have high reliability.

[0176] According to some embodiments of this application, please refer to Figure 11 and Figure 16 The first part 213 has a fourth side 2130 in the second direction x, and the fourth side 2130 protrudes from the third side 2140 along the second direction x.

[0177] The fourth side surface 2130 is the surface of the first part 213 in the second direction x. The fourth side surface 2130 may be parallel to the first side surface 210.

[0178] Along the third direction y, the fourth side 2130 protrudes beyond the third side 2140, which can be understood as the fourth side 2130 extending beyond the third side 2140 in the third direction y.

[0179] In the above scheme, along the third direction y, the fourth side 2130 protrudes from the third side 2140, which allows the first housing 10 and the second housing 20 to form a gap at the part corresponding to the third side 2140 and the fourth side 2130. Alternatively, it can be understood that the first housing 10 and the second housing 20 narrow at this part. On the one hand, this can reduce the volume of the battery 100 and save the installation space of the battery 100. On the other hand, it can achieve the effect of reducing the weight of the battery 100, making the battery 100 lightweight.

[0180] According to some embodiments of this application, see Figure 11 and Figure 16The first part 213 has a third flat surface 2131 in the third direction y, and along the second direction x, one end of the third flat surface 2131 is connected to the third side surface 2140 by an arc transition, and the other end of the third flat surface 2131 is connected to the fourth side surface 2130 by an arc transition.

[0181] The third flat surface 2131 is the surface of the first part 213 in the third direction y. The third flat surface 2131 may be parallel to the fourth surface 231.

[0182] The third flat surface 2131 and the third side surface 2140 can be rounded to allow for a smooth, arc-like transition between them. The third flat surface 2131 and the fourth side surface 2130 can also be rounded to allow for a smooth, arc-like transition between them.

[0183] In the above scheme, a third flat surface 2131 is provided between the third side 2140 and the fourth side 2130. By setting the third flat surface 2131 to be connected to the third side 2140 by an arc at one end and to the fourth side 2130 by an arc at the other end, the risk of damage to the sealing structure between the second end wall 21, the third side wall 23 and the first housing 10 due to stress concentration can be reduced, which is beneficial to the sealing performance between the first housing 10 and the second housing 20, so that the battery 100 has high reliability.

[0184] According to some embodiments of this application, please refer to Figure 12 The second end wall 21 has a first side surface 210 in the second direction x. The flat surface includes a first flat surface 2320. The first flat surface 2320 is disposed at one end of the third side wall 23 away from the second end wall 21. The end of the first flat surface 2320 smoothly transitions to the first side surface 210 through a transition surface 2322. The second direction x, the first direction z, and the third direction y intersect each other.

[0185] The second side surface 232 includes a first flat surface 2320 and a transition surface 2322. The first flat surface 2320 is disposed at one end of the third side wall 23 away from the second end wall 21. The end of the first flat surface 2320 smoothly transitions to the side surface of the second end wall 21 through the transition surface 2322.

[0186] In some embodiments, the first flat surface 2320 can be the upper surface of the third sidewall 23, which can be a flat surface. The transition surface 2322 can be the outer surface of the third sidewall 23, which can be an arc surface, for example, the transition surface 2322 is a circular arc surface.

[0187] "The end of the first flat surface 2320 is smoothly connected to the side of the second end wall 21 through the transition surface 2322" can be understood as the first flat surface 2320 and the side of the second end wall 21 having no sharp corners, and the first flat surface 2320 and the second end wall 21 being connected by the arc-shaped transition surface 2322.

[0188] In the above scheme, the flat surface includes a first flat surface 2320 and a transition surface 2322. The first flat surface 2320 can form a good seal with the first housing 10. By setting the transition surface 2322 between the side surface of the first flat surface 2320 and the side surface of the second end wall 21, the side surface of the first flat surface 2320 and the side surface of the second end wall 21 can be smoothly transitioned, which can facilitate the formation of a good sealing surface between the first housing 10 and the second housing 20, so that the battery 100 has high sealing performance.

[0189] According to some embodiments of this application, please refer to Figures 2-6 The second end wall 21 has a first side surface 210 in the second direction x. The first housing 10 also includes a first side wall 12, one end of which is connected to the first end wall 11 and the other end is connected to the first side surface 210. The second direction x, the first direction z and the third direction y intersect each other.

[0190] In some embodiments, the first side surface 210 may be a surface of the second end wall 21 in the second direction x. In some embodiments, the first side surface 210 may not be a surface of the second end wall 21 in the second direction x; for example, the first side surface 210 may be a surface of other components disposed on the second end wall 21 in the second direction x. In some embodiments, the first side surface 210 may protrude from the surface of the second end wall 21 in the second direction x toward the first housing 10.

[0191] Correspondingly, the first side surface 210 can be understood as the surface of the second end wall 21 that does not face or deviate from the first end wall 11. In some embodiments, the first direction z is perpendicular to the second direction x.

[0192] "One end of the first sidewall 12 is connected to the first endwall 11, and the other end is connected to the first sidewall 210" can mean that the first sidewall 12 connects the first endwall 11 and the second endwall 21 to each other, and the end of the first sidewall 12 away from the first endwall 11 is directly or indirectly connected to the first sidewall 210. This can be understood as the connection surface between the first sidewall 12 and the first endwall 11 being located on the first sidewall 210 and not protruding from the outer contour of the first housing 10 and the second housing 20 in the second direction x. "The end of the first sidewall 12 away from the first endwall 11 is directly or indirectly connected to the first sidewall 210" can mean that the first sidewall 12 is directly connected to the first sidewall 210, or the first sidewall 12 is indirectly connected to the first sidewall 210 through an intermediate connector.

[0193] In the above scheme, by connecting one end of the first side wall 12 of the first housing 10 to the first side surface 210 of the second housing 20 to realize the connection between the first housing 10 and the second housing 20, the connection between the first housing 10 and the second housing 20 can be realized without setting a flange structure protruding along the second direction x, thereby improving the space utilization rate of the battery 100 in the second direction x, so as to accommodate more battery cells or reduce the volume of the battery 100, thereby increasing the volumetric energy density of the battery 100.

[0194] According to some embodiments of this application, please refer to Figures 2-6 The inner surface of the first sidewall 12 is connected to the first sidewall 210.

[0195] The inner surface of the first sidewall 12 can refer to the surface of the first sidewall 12 facing the inside of the battery 100. "The inner surface of the first sidewall 12 is connected to the first side surface 210" can mean that the connection between the inner surface of the first sidewall 12 and the first side surface 210 is a surface-to-surface connection.

[0196] In the above scheme, by connecting the inner surface of the first sidewall 12 (i.e. the surface of the first sidewall 12 facing the first side 210) to the first side 210, the size of the battery 100 in the second direction x can be effectively reduced, so as to maximize the volumetric energy density of the battery 100.

[0197] According to some embodiments of this application, such as Figure 5 and Figure 6 The second end wall 21 has a first surface 211 facing the first end wall 11, and the first side wall 12 extends beyond the first surface 211 in the direction from the first end wall 11 to the second end wall 21.

[0198] The second end wall 21 has a first surface 211 in the first direction z, and the first surface 211 is the surface of the second end wall 21 facing the first end wall 11. The first surface 211 can be regarded as the upper surface of the second end wall 21. In some embodiments, the battery cell is located between the first surface 211 and the first end wall 11.

[0199] "Along the direction from the first end wall 11 to the second end wall 21, the end of the first side wall 12 that is away from the first end wall 11 extends beyond the first surface 211" can refer to the first side wall 12's orthographic projection on the plane where the first side surface 210 is located overlapping the first side surface 210. The overlapping part of the first side wall 12 and the first side surface 210 can be the part where the first side wall 12 and the first side surface 210 are connected to each other.

[0200] In the above scheme, the end of the first sidewall 12 away from the first end plate extends beyond the first surface 211, which enables the first sidewall 12 to be directly connected to the first side surface 210. On the one hand, it can effectively reduce the assembly difficulty and manufacturing cost caused by the indirect connection between the first sidewall 12 and the first side surface 210 through the intermediate connector. On the other hand, the inner surface of the part of the first endwall 11 that extends beyond the first surface 211 can be connected to the first side surface 210, which can effectively reduce the size of the battery 100 in the second direction x, so as to maximize the volumetric energy density of the battery 100.

[0201] According to some embodiments of this application, such as Figure 5 and Figure 6 The second end wall 21 has a second surface 212 that is away from the first end wall 11. In the direction from the first end wall 11 to the second end wall 21, the end of the first side wall 12 that is away from the first end wall 11 does not extend beyond the second surface 212.

[0202] The second end wall 21 has a second surface 212 in the first direction z, and the second surface 212 is the surface of the second end wall 21 that is opposite to the first end wall 11. The second surface 212 can be regarded as the lower surface of the second end wall 21.

[0203] "The end of the first sidewall 12 away from the first endwall 11 does not extend beyond the second surface 212 in the direction from the first endwall 11 to the second endwall 21" can refer to the end of the first sidewall 12 away from the first endwall 11 being flush with the second surface 212 or located between the second surface 212 and the first endwall 11.

[0204] In the above scheme, the end of the first sidewall 12 that is away from the first endwall 11 does not extend beyond the second surface 212, so that the size of the battery 100 in the first direction z is controlled, and the battery 100 has a high volumetric energy density.

[0205] In some embodiments, such as Figure 3The second direction x represents the width direction of battery 100. Battery 100 can be a square battery. The height direction of battery 100 can be the first direction z. The width and length directions of battery 100 can be mutually perpendicular and both perpendicular to the height direction. The dimension of battery 100 in the length direction is generally larger than its dimension in the width direction. In some embodiments, the side of battery 100 in the width direction is the larger surface area of ​​battery 100, i.e., the large surface. The first housing 10 can be the upper housing of the battery 100. In the manufacturing process of the battery 100, the material cost and density of the upper housing can be lower than those of the lower housing. Therefore, when the second direction x is the width direction of the battery 100, the first sidewall 12 can be regarded as the large surface (large area) of the battery 100. The first sidewall 12 can be set as large as possible so that the part of the second housing 20 corresponding to the first sidewall 12 can be set as small as possible, thereby reducing the cost of the second housing 20 and the overall weight of the battery 100, making the battery 100 lighter and improving the weight energy density of the battery 100.

[0206] According to some embodiments of this application, the battery 100 further includes a first fastener (not shown in the figure), and the first sidewall 12 is connected to the first sidewall 210 by the first fastener.

[0207] The first fastener is a connecting component that connects the first sidewall 12 and the first side surface 210. In some embodiments, the first fastener can be a rivet, screw, bolt or other connecting component. In other embodiments, the first fastener can also be an adhesive layer disposed between the first sidewall 12 and the first side surface 210.

[0208] In the above scheme, by setting a first fastener to connect the first sidewall 12 and the first side surface 210, the connection stability between the first sidewall 12 and the first side surface 210 is improved, thereby enhancing the structural stability of the battery 100.

[0209] Based on some embodiments of this application, please refer to... Figure 6 and Figure 7 The first sidewall 12 is provided with a first through hole 120, and the first sidewall 210 is provided with a first threaded hole 2100. The first fastener passes through the first through hole 120 and is connected to the first threaded hole 2100.

[0210] The first through hole 120 can refer to a hole-like structure that penetrates both the outer and inner surfaces of the first sidewall 12. "The first sidewall 210 is provided with a first threaded hole 2100" can refer to a hole-like structure with internal threads formed on the first sidewall 210, such as a self-tapping thread; or it can refer to the threaded hole of a rivet nut or a press-fit nut provided on the first sidewall 210. Please refer to... Figure 6 and Figure 7The number of first through holes 120 can be multiple, and multiple first through holes 120 are arranged at intervals along the extension direction of the first sidewall 12 (the extension direction of the first sidewall 12 is perpendicular to the first direction z and the second direction x); the number of first threaded holes 2100 is also multiple, and the first threaded holes 2100 are correspondingly arranged with the first through holes 120.

[0211] "The first fastener passes through the first through hole 120 and is connected to the first threaded hole 2100" can mean that the first fastener has an external thread that mates with the first threaded hole 2100 so that it can be threadedly connected to the first threaded hole 2100.

[0212] In the above scheme, the first fastener can be a connecting component with external threads, such as a bolt or screw, which can be effectively connected to the first threaded hole 2100, improving the connection stability between the first sidewall 12 and the first side surface 210 and ensuring good sealing between the first sidewall 12 and the first side surface 210.

[0213] According to some embodiments of this application, such as Figure 3 The battery 100 also includes a first seal 30, which is disposed between the first sidewall 12 and the first side surface 210.

[0214] The first seal 30 may be a component having sealing properties and disposed between the first sidewall 12 and the first side surface 210. In some embodiments, the first seal 30 may be a sealant or a gasket, and the first seal 30 is clamped between the first sidewall 12 and the first side surface 210.

[0215] In the above solution, by providing a first sealing element 30 between the first sidewall 12 and the first side surface 210, the sealing performance between the first sidewall 12 and the first side surface 210 can be improved, thereby improving the sealing performance of the battery 100.

[0216] According to some embodiments of this application, such as Figure 3 , Figure 4 and Figure 7 There are two first sidewalls 12, which are arranged opposite each other along the second direction x; the second endwall 21 is located between the two first sidewalls 12, and the second endwall 21 has two first sidewalls 210 arranged opposite each other along the second direction x; the first sidewalls 210 and the first sidewalls 12 correspond one to one.

[0217] In some embodiments, there are two first sidewalls 12, which are disposed opposite to each other along the second direction x, corresponding to the two first sidewalls 210 of the second end wall 21 disposed opposite to each other in the second direction x. The second end wall 21 is located between the two first sidewalls 12, and it can be understood that the outer contour of the battery 100 in the second direction x is defined by the two first sidewalls 12.

[0218] In the above scheme, there are two first sidewalls 12, which are arranged opposite each other along the second direction x and are respectively connected to the corresponding first sidewalls 210. This can effectively improve the space utilization of the battery 100 in the second direction x, thereby improving the volumetric energy density of the battery 100.

[0219] In some other embodiments, the number of first sidewalls 12 may be one, which can save space for the battery 100 on one side in the second direction x.

[0220] According to some embodiments of this application, such as Figure 6 The second housing 20 also includes two second side walls 22, which are arranged opposite to each other along the second direction x and connected to the second end wall 21, and the battery cell is disposed between the two second side walls 22.

[0221] The second sidewall 22 is a component disposed on the second endwall 21. The second sidewall 22 can be disposed on the second endwall 21 by means of welding, bonding, or bolting, or the second sidewall 22 can be integrally formed with the second endwall 21. The second endwall 21 has a first surface 211 facing the first endwall 11, and the second sidewall 22 protrudes from the first surface 211 in the direction from the second endwall 21 to the first endwall 11.

[0222] In some embodiments, the first side surface 210 may be a surface on which the second side wall 22 is connected to the first side wall 12.

[0223] In some embodiments, the outer surface of the second sidewall 22 may be flush with the first sidewall 210.

[0224] In the above scheme, two opposing second sidewalls 22 are provided on the second end wall 21 along the second direction x. On the one hand, this can improve the structural strength of the second housing 20. On the other hand, it can define the installation area of ​​the battery cell, so that the battery cell can be stably assembled in the second housing 20. Furthermore, since the second sidewalls 22 protrude from the surface of the second end wall 21, when the battery cell is glued to the second housing 20, the overflow space can be effectively controlled, reducing the risk of waste and environmental pollution caused by glue overflow.

[0225] According to some embodiments of this application, please refer to Figure 4 and Figure 7 The first box 10 has openings 13 at both ends along the third direction y, and the two third side walls 23 respectively close the two openings 13.

[0226] When the first direction z is the height direction of battery 100 and the second direction x is the width direction of battery 100, the third direction y can be the length direction of battery 100.

[0227] The third sidewall 23 is a component disposed on the second end wall 21. The third sidewall 23 can be connected to the second end wall 21 by means of welding, bonding, or bolting, or the third sidewall 23 can be integrally formed with the second end wall 21. The second end wall 21 has a first surface 211 facing the first end wall 11, and the third sidewall 23 protrudes from the first surface 211 in the direction from the second end wall 21 to the first end wall 11. The third sidewall 23 can improve the structural strength of the first housing 10. In some embodiments, the third sidewall 23 can be used to install components such as explosion-proof valves, water-cooled connectors, or high and low voltage connectors, so that the battery 100 can charge and discharge normally.

[0228] The openings 13 formed at both ends of the first housing 10 along the third direction y can be notches corresponding to the third sidewall 23. The third sidewall 23 can correspondingly close the openings 13, reducing the risk of additional mutual interference or overlap of the battery 100, thereby improving the utilization rate of the manufacturing materials of the battery 100 and making the battery 100 have a lower manufacturing cost; at the same time, it also reduces the risk of the battery 100 generating additional mutual interference or overlap, resulting in wasted space. In some embodiments, the cross-sectional shape of the first housing 10 can be U-shaped.

[0229] In the above scheme, by setting the third sidewall 23, on the one hand, components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors can be installed on the third sidewall 23, so that the battery 100 can charge and discharge normally; on the other hand, compared with the flange structure that protrudes along the third direction y between the first housing 10 and the second housing 20, by setting the third sidewall 23 to close the opening 13, the space utilization rate of the battery 100 in the third direction y can be improved, and the volumetric energy density of the battery 100 can be improved.

[0230] According to some embodiments of this application, please refer to Figure 15 The dimension of one of the third sidewalls 23 along the first direction z is smaller than the dimension of the other third sidewall 23 along the first direction z.

[0231] The dimension of the third sidewall 23 in the first direction z can be regarded as the height of the third sidewall 23. "The dimension of one third sidewall 23 in the first direction z is smaller than the dimension of the other third sidewall 23 in the first direction z" can mean that one third sidewall 23 is higher and the other third sidewall 23 is lower. Since the heights of the two third sidewalls 23 are different, the resulting height difference can be compensated by the first housing 10.

[0232] In the above scheme, the larger third sidewall 23 can be used to install components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors, so that the battery 100 can charge and discharge normally. By reducing the size of the other third sidewall 23, the size of the first housing 10 corresponding to the third sidewall 23 can be adaptively increased, thereby increasing the proportion of the first housing 10 in the battery 100 (in this embodiment, the first housing 10 can be an upper housing with lower material cost and density), thereby reducing the manufacturing cost of the battery 100 and increasing the weight energy density of the battery 100.

[0233] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The first housing 10 includes two connecting parts 14, which are located at both ends of the first housing 10 along the third direction y. The connecting parts 14 form an opening 13 and are connected to the second side 232.

[0234] The third surface 230 can be the inner surface of the third sidewall 23, the fourth surface 231 can be the outer surface of the third sidewall 23, and the second side surface 232 can be the outer peripheral surface of the third sidewall 23 located between the inner surface and the outer surface. The outer peripheral surface of the third sidewall 23 can refer to the outer surface of the third sidewall 23 in the first direction z and the second direction x.

[0235] The connecting part 14 is a component located at the end of the first housing 10 in the third direction y, which surrounds the opening 13 of the first housing 10 and the outline of the connecting part 14 fits the second side surface 232 of the third side wall 23.

[0236] "Connecting part 14 is connected to the second side 232" can refer to the fact that, in the third direction y, the first housing 10 and the second housing 20 are connected to each other through the connecting part 14 and the second side 232.

[0237] See Figure 7 The connecting portion 14 may be in the form of a sheet, which mates with the second side surface 232. In some embodiments, the connection between the connecting portion 14 and the second side surface 232 is a surface-to-surface connection.

[0238] In the above solution, by providing a connecting part 14 to connect with the second side 232 of the third side wall 23, the connection stability and sealing performance of the first housing 10 and the second housing 20 can be improved.

[0239] According to some embodiments of this application, please refer to Figure 13 and Figure 14 The first housing 10 also includes a fourth side wall 15, which is adjacent to the first side wall 12. One end of the fourth side wall 15 is connected to the first end wall 11, and the connecting part 14 protrudes from the fourth side wall 15 in a direction away from the enclosed space.

[0240] The first end wall 11 has a lower surface facing the second end wall 21. The fourth side wall 15 is a component protruding from the lower surface and adjacent to the first side wall 12. The fourth side wall 15 can be welded, bonded, or bolted to the first end wall 11, or it can be integrally formed with the first end wall 11. When the first housing 10 has two first side walls 12 arranged opposite each other along the second direction x, the fourth side wall 15 is located between the two first side walls 12, and one end of the fourth side wall 15 is connected to the first end wall 11. The opposite ends of the fourth side wall 15 in the second direction x are respectively connected to the two first side walls 12.

[0241] The connecting part 14 can protrude from inside the closed space to outside the closed space onto the fourth side wall 15. The connecting part 14 can be integrally formed with the fourth side wall 15, or the connecting part 14 can be connected to the fourth side wall 15 by welding, bonding or bolting.

[0242] In some embodiments, combined with Figure 13 and Figure 14 By setting a fourth sidewall 15, the size of the third sidewall 23 in the first direction z can be reduced. That is, the larger the size of the fourth sidewall 15 in the first direction z, the smaller the size of the third sidewall 23 in the first direction z can be.

[0243] In the above scheme, the first box 10 can be the upper box and the second box 20 can be the lower box. In the manufacturing process of the battery 100, the material cost and density of the upper box can be lower than those of the lower box. Therefore, by setting the fourth side wall 15, the proportion of the first box 10 in the battery 100 is increased, thereby effectively reducing the manufacturing cost of the battery 100 and increasing the weight energy density of the battery 100.

[0244] According to some embodiments of this application, the battery 100 further includes a second fastener (not shown in the figure), and the connecting portion 14 is connected to the second side 232 via the second fastener.

[0245] The second fastener is a connecting component that connects the second side 232 and the connecting portion 14. In some embodiments, the second fastener can be a rivet, screw, bolt, or other connecting member. In other embodiments, the second fastener can also be an adhesive layer disposed between the connecting portion 14 and the second side 232. Please refer to [link / reference]. Figure 8 When the second fastener is a threaded part, such as a bolt, a corresponding second threaded hole 2323 can be provided on the second side 232.

[0246] In the above solution, by setting a second fastener to connect the second side 232 and the connecting part 14, the connection stability between the connecting part 14 and the second side 232 is improved, thereby improving the structural stability of the battery 100.

[0247] According to some embodiments of this application, such as Figure 7 and Figure 8 The connecting part 14 is provided with a second through hole 140, and the second side 232 is provided with a second threaded hole 2323. The second fastener passes through the second through hole 140 and is connected to the second threaded hole 2323.

[0248] The second through hole 140 can refer to a hole-like structure that penetrates both the outer and inner surfaces of the connecting part 14. "The second side surface 232 is provided with a second threaded hole 2323" can refer to a hole-like structure with internal threads formed on the second side surface 232, such as a self-tapping thread; or it can refer to a rivet nut or press-fit nut provided on the second side surface 232. Please refer to... Figure 7 and Figure 8 The number of second through holes 140 can be multiple, and multiple second through holes 140 are arranged at intervals; the number of second threaded holes 2323 is also multiple, and the first threaded hole 2100 is set corresponding to the first through hole 120.

[0249] "The second fastener passes through the second through hole 140 and is connected to the second threaded hole 2323" can refer to the second fastener having an external thread that mates with the second threaded hole 2323 so that it can be threadedly connected to the second threaded hole 2323.

[0250] In the above scheme, the second fastener can be a connecting component with external threads, such as a bolt or screw, which can be effectively connected to the second threaded hole 2323, improving the connection stability between the connecting part 14 and the second side 232, and making the connecting part 14 and the second side 232 have good sealing performance.

[0251] According to some embodiments of this application, please refer to Figure 3 The battery 100 also includes a second seal 31, which is disposed between the connecting portion 14 and the second side 232.

[0252] The second seal 31 may be a component with sealing properties and disposed between the connecting portion 14 and the second side surface 232. In some embodiments, the second seal 31 may be a sealant or a sealing gasket, and the second seal 31 is sandwiched between the first flat surface 2320 and the connecting portion 14, between the second flat surface 2321 and the connecting portion 14, and between the transition surface 2322 and the connecting portion 14.

[0253] In the above solution, by providing a second seal 31 between the connecting part 14 and the second side 232, the sealing performance between the connecting part 14 and the second side 232 can be improved, thereby improving the sealing performance of the battery 100.

[0254] According to some embodiments of this application, please refer to Figure 3The battery 100 also includes a first seal 30, which is disposed between the first sidewall 12 and the first side surface 210. The two ends of the first seal 30 are respectively connected to two second seals 31.

[0255] exist Figure 3 In the first seal 30, the first seal 30 corresponds to the connection between the first side 210 and the first side wall 12, and it can extend along the length direction of the battery 100. The second seal 31 corresponds to the connection between the second side 232 and the first housing 10, and it includes a portion extending along the width direction of the battery 100, a portion extending along the height direction of the battery 100, and a portion corresponding to the transition surface 2322.

[0256] In some embodiments, the first seal 30 and the second seal 31 can be independent structures, and the first seal 30 and the second seal 31 can be connected by bonding or an intermediate connector. In other embodiments, the first seal 30 and the second seal 31 can be an integral structure.

[0257] In the above scheme, the first sealing element 30 and the second sealing element 31 can be integrally formed or separately connected. By setting the first sealing element 30 and the second sealing element 31, good sealing performance can be achieved between the first housing 10 and the second housing 20, thereby improving the reliability of the battery 100.

[0258] According to some embodiments of this application, such as Figure 3 and Figure 5 The second end wall 21 is provided with a mounting part 40 for mounting the battery 100 to the power device.

[0259] The mounting part 40 is a component disposed on the second end wall 21 for mounting the battery 100 to the electrical device. The mounting part 40 can be a connecting structure such as a nut or a connecting bracket disposed on the second end wall 21. In some embodiments, there can be multiple mounting parts 40, which can be arranged along the third direction y and the second direction x. In some embodiments, the mounting part 40 can be an M8, M10, M12, or M16 threaded hole structure disposed on the second end wall 21.

[0260] In the above scheme, a mounting part 40 is provided on the second end wall 21 to achieve stable assembly of the battery 100, so that the battery 100 can stably provide power.

[0261] According to some embodiments of this application, the material density of the first housing 10 is less than the material density of the second housing 20.

[0262] Material density is the mass per unit volume of a material under a specific volume condition.

[0263] The material density of the first housing 10 is smaller than that of the second housing 20, so the density of the battery 100 is reduced. Under the same volume, the weight of the battery 100 is reduced, thereby increasing the weight energy density of the battery 100.

[0264] In some other embodiments, the material density of the first housing 10 may also be equal to or greater than the material density of the second housing 20.

[0265] According to some embodiments of this application, the first housing 10 is made of plastic, and the second housing 20 is made of aluminum alloy.

[0266] Plastics are cheaper and have a lower density than aluminum alloys. Aluminum alloys have higher structural strength and stiffness than plastics.

[0267] In the above scheme, the first housing 10 can be the upper housing of the battery 100, and the second housing 20 can be the lower housing of the battery 100. The second housing 20 is made of aluminum alloy, which gives it high structural strength and rigidity, providing excellent protection for the battery cells. The first housing 10, as the upper housing, seals the battery cells between the upper and lower housings. Being made of plastic, it effectively reduces the manufacturing cost of the battery 100 and its weight, thereby increasing its gravimetric energy density.

[0268] In some other embodiments, the first housing 10 may also be made of materials such as aluminum, aluminum alloy, steel, or stainless steel. In some other embodiments, the second housing 20 may also be made of materials such as plastic, aluminum, steel, or stainless steel.

[0269] According to some embodiments of this application, the second end wall 21 is used to carry a battery cell.

[0270] During assembly, the battery cell can be assembled onto the inner surface of the second end wall 21, and the second end wall 21 supports the battery cell, which facilitates the positioning of the battery cell.

[0271] In the above scheme, the second end wall 21 can serve as an assembly base when assembling battery cells, which facilitates the assembly of battery cells.

[0272] According to some embodiments of this application, an electrical device is also provided, including the battery 100 described above, which is used to provide electrical energy. In some embodiments, the electrical device may be a vehicle 1000, which may be a heavy truck or a bus.

[0273] According to some embodiments of this application, this application also provides a battery 100, please refer to [link to relevant documentation]. Figures 3-8The battery 100 includes a first housing 10, a second housing 20, and individual battery cells. The first housing 10 is the upper housing of the battery 100, and the second housing 20 is the lower housing of the battery 100. The second housing 20 and the first housing 10 are connected to each other to form a closed space, within which the individual battery cells are disposed. The first housing 10 includes a first end wall 11, two first side walls 12, and two connecting portions 14. The first end wall 11 can be the top wall of the battery 100, and the two first side walls 12 are disposed opposite each other on the first end wall 11 along a second direction x (the width direction of the battery 100). The two connecting portions 14 are located at both ends of the first housing 10 along a third direction y (the length direction of the battery 100), forming an opening 13. The second housing 20 includes a second end wall 21 and two second side walls 22. The second end wall 21 can be the bottom wall of the battery 100, and the second housing 20 has two first surfaces 211 disposed opposite each other along the second direction x. The second end wall 21 may be provided with crossbeams 24, and there may be multiple crossbeams 24, which are spaced apart along the third direction y. The crossbeams 24 can improve the structural strength of the second housing 20, and the battery cells can also be connected to the crossbeams 24. Two second side walls 22 are arranged opposite to each other along the third direction y (the length direction of the battery 100) of the second end wall 21. The second side walls 22 have a first flat surface 2320 facing the first end wall 11, two second flat surfaces 2321 arranged opposite each other along the second direction x, and a transition surface 2322 connecting the first flat surface 2320 and the second flat surface 2321.

[0274] The first end wall 11 and the second end wall 21 are arranged opposite each other along the first direction z (the height direction of the battery 100). The inner surface of the first side wall 12 is connected to the first side surface 210. A first sealing element 30 is provided between the first side wall 12 and the first side surface 210. The first side wall 12 and the second side surface 232 are connected by a first fastener. The second side wall 22 corresponds to the connecting part 14. A second sealing element 31 is provided between the second side wall 22 and the connecting part 14. The first flat surface 2320, the second flat surface 2321, and the transition surface 2322 are all connected to the connecting part 14 by a second fastener.

[0275] A mounting part 40 for mounting the battery 100 to an electrical device (such as a heavy truck or bus) is provided on the crossbeam 24.

[0276] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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, characterized in that, include: Battery cell; The first housing includes the first end wall; The second housing, together with the first housing, forms a closed space for accommodating the battery cell. The second housing includes a second end wall and two third side walls. The second end wall and the first end wall are arranged opposite to each other along a first direction, and the two third side walls are arranged opposite to each other along a third direction and connected to the second end wall. The third sidewall includes a third surface facing the enclosed space, a fourth surface facing away from the enclosed space, and a second side surface connecting the third surface and the fourth surface; the second side surface includes a straight surface and a transition surface for sealing connection with the first housing, the straight surface and the transition surface being connected and smoothly transitioning.

2. The battery according to claim 1, characterized in that, The flat surface includes a first flat surface and a second flat surface. The first flat surface is disposed at one end of the third sidewall away from the second endwall. The two second flat surfaces are respectively disposed at both ends of the third sidewall along the second direction. The transition surface connects the first flat surface and the second flat surface so that the first flat surface and the second flat surface transition smoothly. The second direction, the first direction and the third direction intersect each other.

3. The battery according to claim 2, characterized in that, The transition surface is a circular arc transition surface.

4. The battery according to claim 2, characterized in that, The transition surface includes a first transition surface and a second transition surface that are connected to each other. The first transition surface has a straight edge in the third direction, and the second transition surface has an arc-shaped edge in the third direction.

5. The battery according to claim 4, characterized in that, The number of first transition surfaces is one, and the number of second transition surfaces is two, with the first transition surface disposed between two adjacent second transition surfaces.

6. The battery according to claim 1, characterized in that, The flat surface includes two second flat surfaces, which are respectively disposed at both ends of the third sidewall along the second direction. The ends of the two second flat surfaces opposite to the second endwall are connected by the transition surface. The second direction, the first direction, and the third direction intersect each other.

7. The battery according to any one of claims 2-6, characterized in that, The second end wall has a first side surface in the second direction, and the second direction, the first direction, and the third direction intersect each other, with the second straight surface flush with the first side surface.

8. The battery according to claim 1, characterized in that, The second end wall has a first side surface in the second direction. The flat surface includes a first flat surface. The first flat surface is disposed at one end of the third side wall away from the second end wall. The end of the first flat surface smoothly transitions to the first side surface through the transition surface. The second direction, the first direction, and the third direction intersect each other.

9. The battery according to claim 1, characterized in that, The second end wall has a first side surface in the second direction, and the first housing also includes a first side wall, one end of which is connected to the first end wall and the other end of which is connected to the first side surface. The second direction, the first direction, and the third direction intersect each other.

10. The battery according to claim 9, characterized in that, The inner surface of the first sidewall is connected to the first side surface.

11. The battery according to claim 9, characterized in that, The second end wall has a first surface facing the first end wall, and in a direction from the first end wall to the second end wall, the end of the first side wall away from the first end wall extends beyond the first surface.

12. The battery according to claim 9, characterized in that, The second end wall has a second surface facing away from the first end wall, and the end of the first side wall away from the first end wall does not extend beyond the second surface.

13. The battery according to claim 9, characterized in that, The battery also includes a first fastener, through which the first sidewall is connected to the first side surface.

14. The battery according to claim 13, characterized in that, The first sidewall is provided with a first through hole, the first side is provided with a first threaded hole, and the first fastener passes through the first through hole and is connected to the first threaded hole.

15. The battery according to claim 9, characterized in that, The battery also includes a first seal, which is disposed between the first sidewall and the first side surface.

16. The battery according to claim 9, characterized in that, There are two first sidewalls, which are arranged opposite each other along the second direction; the second end wall is located between the two first sidewalls, and the second end wall has two first side surfaces arranged opposite each other along the second direction; the first side surfaces and the first sidewalls correspond one to one.

17. The battery according to claim 9, characterized in that, The second housing also includes two second side walls, which are arranged opposite to each other along the second direction and connected to the second end wall, and the battery cell is disposed between the two second side walls.

18. The battery according to claim 9, characterized in that, The first housing has openings at both ends along the third direction, and the two third sidewalls respectively close the two openings.

19. The battery according to claim 18, characterized in that, The dimension of one of the third sidewalls along the first direction is smaller than the dimension of the other third sidewall along the first direction.

20. The battery according to claim 18, characterized in that, The first housing includes two connecting parts, which are located at both ends of the first housing along the third direction. The connecting parts form the opening and are connected to the second side.

21. The battery according to claim 20, characterized in that, The first housing also includes a fourth side wall, which is adjacent to the first side wall; One end of the fourth sidewall is connected to the first endwall, and the connecting portion protrudes from the fourth sidewall in a direction away from the enclosed space.

22. The battery according to claim 20, characterized in that, The battery also includes a second fastener, and the connecting portion is connected to the second side via the second fastener.

23. The battery according to claim 22, characterized in that, The connecting part is provided with a second through hole, and the second side is provided with a second threaded hole. The second fastener passes through the second through hole and is connected to the second threaded hole.

24. The battery according to claim 20, characterized in that, The battery also includes a second seal, which is disposed between the connecting portion and the second side.

25. The battery according to claim 24, characterized in that, The battery further includes a first seal, which is disposed between the first sidewall and the first side surface; The first sealing element is connected to two second sealing elements at both ends.

26. The battery according to claim 1, characterized in that, The second end wall is provided with a mounting part for mounting the battery to the power device.

27. The battery according to claim 1, characterized in that, The material density of the first box is less than that of the second box.

28. The battery according to claim 1, characterized in that, The first box is made of plastic, and the second box is made of aluminum alloy.

29. The battery according to claim 1, characterized in that, The second end wall is used to support the battery cell.

30. An electrical device, characterized in that, Includes the battery according to any one of claims 1-29, said battery being used to provide electrical energy.

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