Battery apparatus and electrical apparatus

Abstract

The present application relates to the technical field of batteries, and discloses a battery apparatus and an electrical apparatus. The battery apparatus comprises a casing, battery cells, and an expansion beam. The battery cells are accommodated in the casing, and the expansion beam is disposed in the casing. The expansion beam is detachably connected to the casing by means of first fasteners. By detaching and installing the first fasteners, an expansion beam compatible with the battery cells can be installed without needing to redesign the casing, thereby reducing the design and manufacturing costs of the battery apparatus. When the expansion beam requires maintenance, the expansion beam can be replaced directly without replacing the entire casing, which helps reduce the maintenance cost of the battery apparatus and, in turn, reduces the product cost of the battery apparatus.

Description

Battery devices and electrical appliances Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. 202421841202.4, entitled “Battery Device and Power Consumption Device”, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery device 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] How to reduce the product cost of battery devices is an urgent problem to be solved in battery technology. Summary of the Invention

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

[0006] In a first aspect, this application provides a battery device, which includes a housing, battery cells, and an expansion beam. The battery cells are housed within the housing, and the expansion beam is disposed within the housing. The expansion beam is detachably connected to the housing via a first fastener.

[0007] In the technical solution of this application embodiment, the expansion beam adapted to the battery cell can be replaced by disassembling and assembling the first fastener, without the need to redesign the casing, which helps to reduce the design and manufacturing costs of the battery device. When the expansion beam needs maintenance, only the expansion beam needs to be replaced, without the need to replace the entire casing, which helps to reduce the maintenance costs of the battery device, and thus helps to reduce the product cost of the battery device.

[0008] In one or more embodiments of the first aspect, the housing includes a bottom wall and a first support, the first support being connected to the bottom wall, and the expansion beam being detachably connected to the first support via a first fastener.

[0009] In the technical solution of this application embodiment, the first bracket can provide a certain assembly space for the assembly of the first fastener, reducing the risk that the first fastener being directly connected to the wall of the casing would increase the difficulty of sealing the casing. At the same time, the first bracket can serve as an assembly base for the expansion beam, facilitating the pre-positioning of the expansion beam and the positioning of the battery cells.

[0010] In one or more embodiments of the first aspect, the housing further includes side walls surrounding the bottom wall. The housing also includes a second support connected to the side walls and detachably connected to the expansion beam by a second fastener.

[0011] In the above design, the second bracket increases the connection strength between the expansion beam and the housing. Furthermore, the detachable connection between the second bracket and the expansion beam allows the battery device to achieve lower design, manufacturing, and maintenance costs.

[0012] In one or more embodiments of the first aspect, the second bracket is connected to the side of the expansion beam away from the battery cell.

[0013] In the above scheme, the second support can provide a certain supporting force when the battery cell expands, which helps to improve the ability of the expansion beam to resist the expansion force of the battery cell.

[0014] In one or more embodiments of the first aspect, the second bracket includes a first connecting part, a second connecting part and a third connecting part connected in sequence. The first connecting part is connected to the side of the expansion beam away from the battery cell, the third connecting part is connected to the side wall, and the second connecting part, the side wall and the expansion beam enclose a first cavity.

[0015] In the above scheme, when the battery cell expands, the second connecting part, the side wall and the expansion beam form a first cavity, which can better release the stress of the expansion beam, thereby improving the expansion beam's ability to resist expansion force and improving the structural stability of the expansion beam.

[0016] In one or more embodiments of the first aspect, the housing further includes a third support, which is connected to the side wall and is connected to the expansion beam on the side facing the battery cell by a third fastener.

[0017] In the above scheme, the placement of the third support further improves the structural stability of the expansion beam while enabling the battery device to achieve lower design, manufacturing, and maintenance costs.

[0018] In one or more embodiments of the first aspect, the third bracket includes a fourth connecting portion and a fifth connecting portion connected in sequence, the fourth connecting portion being connected to the side of the expansion beam facing the battery cell, the fifth connecting portion being connected to the side wall, and the fifth connecting portion and the fourth connecting portion being perpendicular to each other.

[0019] In the above scheme, the fourth connecting part is basically in contact with the expansion beam, the fifth connecting part is basically in contact with the side wall, and there is a large space between the fourth connecting part and the fifth connecting part, which reduces the risk of the energy density of the battery device being reduced due to interference between the battery cell and the third support.

[0020] In one or more embodiments of the first aspect, the expansion beam is formed by welding together multiple sheet metal parts.

[0021] In the above solution, the expansion beam can be manufactured at a lower cost by welding multiple sheet metal parts together. Furthermore, the expansion beam formed by welding multiple sheet metal parts can be assembled or disassembled as an independent component, resulting in high assembly efficiency and relatively low assembly costs.

[0022] In one or more embodiments of the first aspect, the expansion beam includes a first sheet metal part, a second sheet metal part, and a third sheet metal part. The first sheet metal part is located on the side of the expansion beam facing the battery cell, the third sheet metal part is located on the side of the expansion beam away from the battery cell, and at least a portion of the second sheet metal part is located between the first sheet metal part and the third sheet metal part. The second sheet metal part divides the space between the first sheet metal part and the third sheet metal part into a plurality of second cavities.

[0023] In the above scheme, the second sheet metal part allows the multiple second cavities formed between the first sheet metal part and the third sheet metal part to serve as stress release areas, which helps to improve the expansion beam's ability to resist expansion force and also reduces the weight of the expansion beam, enabling the battery device to achieve a high mass energy density.

[0024] In one or more embodiments of the first aspect, the second sheet metal part has a first groove on the side facing the first sheet metal part, and a second groove on the side facing the third sheet metal part. The first groove and the second groove are alternately arranged along the thickness direction of the bottom wall. The bottom wall of the first groove is connected to the third sheet metal part, and the bottom wall of the second groove is connected to the first sheet metal part.

[0025] In the above solution, alternating first and second grooves are formed by bending the second sheet metal part, which reduces processing difficulty and cost. Simultaneously, the connection between the bottom wall of the second groove and the first sheet metal part improves the first sheet metal part's resistance to expansion forces, thereby enhancing the expansion beam's resistance to expansion forces.

[0026] In one or more embodiments of the first aspect, the first sheet metal part includes a first main body portion and a first flange portion, the first flange portion being connected to an end of the first main body portion away from the bottom wall in the thickness direction of the bottom wall. The third sheet metal part includes a third main body portion and a third flange portion, the third flange portion being connected to an end of the third main body portion away from the bottom wall in the thickness direction of the bottom wall. The first flange portion and the third flange portion are welded together.

[0027] In the above scheme, welding the first flange and the third flange can reduce the risk of excessive deformation of the first main body and the third main body due to welding deformation, thereby improving the structural stability of the expansion beam.

[0028] In one or more embodiments of the first aspect, the first sheet metal part further includes a fourth flange portion, which is connected to one end of the first main body portion near the bottom wall in the thickness direction of the bottom wall. The fourth flange portion is detachably connected to the first bracket by a first fastener.

[0029] In the above scheme, by setting a fourth flange, the assembly space is increased during the assembly of the first fastener, thereby making the assembly between the expansion beam and the first bracket easier.

[0030] In one or more embodiments of the first aspect, the second sheet metal part includes a second main body portion and a second flange portion, the second flange portion being connected to one end of the second main body portion near the bottom wall in the thickness direction of the bottom wall. The expansion beam also includes a fourth sheet metal part, the second flange portion being located between the first flange portion and the fourth sheet metal part, the first flange portion, the second flange portion and the fourth sheet metal part being welded together.

[0031] In the above solution, the first sheet metal part, the second sheet metal part, and the fourth sheet metal part can be connected by a single welding, resulting in higher assembly efficiency.

[0032] In one or more embodiments of the first aspect, the second flange is provided with a first notch, and the fourth sheet metal part is provided with a second notch. The first notch and the second notch are positioned correspondingly. The first flange includes a first part and a second part. The first part is welded to the second flange and the fourth sheet metal part. The second part is exposed by the first notch and the second notch and is connected to the first bracket.

[0033] In the above scheme, due to the setting of the first notch and the second notch, the first fastener can be connected to the first bracket by passing through a sheet metal part, which reduces the assembly difficulty and makes the connection stability between the expansion beam and the first bracket relatively high.

[0034] In one or more embodiments of the first aspect, the second portion protrudes from the first portion toward the bottom wall.

[0035] In the above scheme, since the second part protrudes from the first part towards the bottom wall, the assembly between the expansion beam and the first support can be completed to a certain extent without changing the shape of the first support connection surface, and the processing cost is relatively low.

[0036] In one or more embodiments of the first aspect, the fourth sheet metal part includes a fourth main body portion and a fifth flange portion, the fifth flange portion being connected to the end of the fourth main body portion away from the bottom wall in the thickness direction of the bottom wall, and a second notch being disposed in the fifth flange portion. At least a portion of the fourth main body portion is located on the side of the first bracket facing the battery cell.

[0037] In the above scheme, at least a portion of the fourth main body is located on the side of the first support facing the battery cell, so that when the battery cell expands and deforms, most of its area can be supported by the expansion beam, thereby improving the reliability of the battery device.

[0038] In one or more embodiments of the first aspect, the fourth sheet metal part further includes a sixth flange portion, which is connected to the end of the fourth main body portion near the bottom wall in the thickness direction of the bottom wall. The third sheet metal part further includes a seventh flange portion, which is connected to the end of the third main body portion near the bottom wall in the thickness direction of the bottom wall. The sixth flange portion and the seventh flange portion are connected.

[0039] In the above scheme, the connection between the sixth flange and the seventh flange can reduce the risk of excessive deformation of the third and fourth main bodies due to assembly stress, thereby improving the structural stability of the expansion beam.

[0040] In one or more embodiments of the first aspect, multiple battery cells are provided, arranged in multiple rows. Each row of battery cells includes multiple battery cells arranged along a first direction. The multiple rows of battery cells are arranged along a second direction, and the first direction, the second direction, and the thickness direction of the bottom wall are perpendicular to each other. Two expansion beams and two first supports are provided, with each first support corresponding to one expansion beam. The two expansion beams are spaced apart along the first direction, and the battery cells are located between the two expansion beams in the first direction.

[0041] In the above scheme, the two expansion beams can resist the expansion force of the battery cells in the first direction, so as to reduce the risk of excessive deformation of the box due to the expansion and deformation of the battery cells, which may lead to seal failure.

[0042] In one or more embodiments of the first aspect, the battery device further includes a pressure strip extending along a first direction, with its two ends respectively connected to two expansion beams, and the pressure strip pressing against the side of the battery cell away from the bottom wall.

[0043] In the above scheme, the setting of the pressure bar can compress the battery cells, reduce the risk of battery cell shaking, and make the battery device have high structural stability.

[0044] In one or more embodiments of the first aspect, the two expansion beams are a first expansion beam and a second expansion beam, respectively. The battery device includes a heat exchange tube, an inlet water nozzle, and an outlet water nozzle. The heat exchange tube is disposed on the bottom wall and passes through a first bracket corresponding to the first expansion beam. The inlet water nozzle and the outlet water nozzle are located on the side of the first expansion beam away from the battery cell, and both the inlet water nozzle and the outlet water nozzle are connected to the heat exchange tube.

[0045] In the above scheme, the inlet and outlet water nozzles are located on the side of the first expansion beam away from the battery cell, which does not occupy the space between the first and second expansion beams. This allows most of the battery cells between the first and second expansion beams to be supported by the first and second expansion beams, which helps to improve the reliability of the battery device.

[0046] Secondly, this application provides an electrical device, including the battery device in one or more embodiments of the first aspect, the battery device being used to provide electrical energy.

[0047] In the above solution, since the battery device in one or more embodiments of the first aspect has a lower product cost, the power supply device including the battery device in one or more embodiments of the first aspect also has a lower cost.

[0048] 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 other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0049] 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:

[0050] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0051] Figure 2 is an exploded view of a battery device according to some embodiments of this application;

[0052] Figure 3 is an exploded view of a battery cell according to some embodiments of this application;

[0053] Figure 4 is an isometric view of a portion of the structure of a battery device according to some other embodiments of this application;

[0054] Figure 5 is a magnified view of part A in Figure 4;

[0055] Figure 6 is a magnified view of part B in Figure 4;

[0056] Figure 7 is an isometric view of an expansion beam according to some other embodiments of this application;

[0057] Figure 8 is an exploded view of the expansion beam of some other embodiments of this application;

[0058] Figure 9 is a cross-sectional schematic diagram of a portion of the structure of a battery device according to some other embodiments of this application;

[0059] Figure 10 is an isometric view of a portion of the structure of a battery device according to some embodiments of this application.

[0060] The reference numerals in the detailed embodiments are as follows:

[0061] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Main Body of Housing; 111 - First Housing; 112 - Second Housing; 12 - Battery Cell; 121 - Outer Shell; 1211 - End Cap; 1212 - Housing; 122 - Electrode Assembly; 123 - Electrode Terminal; 124 - Adapter Plate; 13 - Expansion Beam; 131 - First Sheet Metal Part; 1311 - First Main Body; 1312 - First flanged part; 1313 - Fourth flanged part; 13131 - First section; 13132 - Second section; 1314 - First through hole; 132 - Second sheet metal part; 1321 - First groove; 1322 - Second groove; 1323 - Second main body part; 1324 - Second flanged part; 13241 - First notch; 1325 - Second through hole; 133 - Third sheet metal part; 1331 - Third Main body; 1332-Third flange; 1333-Seventh flange; 134-Fourth sheet metal part; 1344-Fourth notch; 1341-Fourth main body; 1342-Fifth flange; 13421-Second notch; 1343-Sixth flange; 1318-Third notch; 14-Box body; 141-Bottom wall; 142-Side wall; 15-First bracket; 16-Second bracket; 161-First connecting part; 162-Second connecting part; 163-Third connecting part; 17-Third bracket; 171-Fourth connecting part; 172-Fifth connecting part; 18-Output electrode base; 19-Pressure strip; 20-First cavity; 21-First fastener; 22-Second fastener; 23-Third fastener; 24-Heat exchange tube; 25-Inlet water nozzle; 26-Outlet water nozzle; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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).

[0067] The shape of a battery cell can include, but is not limited to, cylinders, flat bodies, cuboids, or other shapes. According to the packaging method, battery cells can include, but are not limited to, cylindrical battery cells, prismatic battery cells, pouch battery cells, and blade battery cells.

[0068] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0069] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0075] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0076] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0077] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0078] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the openings of the housing to define a space for accommodating the electrode assemblies.

[0079] The electrode assembly is housed within a containment space and includes a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated one, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. To prevent melting when carrying large currents, multiple positive tabs and multiple negative tabs are stacked together. Furthermore, the electrode assembly can be formed in various ways, including but not limited to wound or stacked configurations.

[0080] Tabs typically draw electrical energy from an electrode assembly by connecting it to a conductive element. In some cases, the conductive element is an adapter that connects the tab and the electrode terminal; in other cases, the conductive element is the electrode terminal.

[0081] Electrode terminals generally include positive and negative electrode terminals. For rectangular battery cells, the electrode terminals are typically located on the end cap. In some other cases, the electrode terminals may also be located on the casing. Multiple battery cells can be connected in series and / or parallel via electrode terminals for various applications.

[0082] The development of battery technology must take into account multiple design factors, such as reliability, energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the product cost of battery devices also needs to be considered.

[0083] Typically, battery pack housings incorporate expansion beams. These beams serve two purposes: they constrain the individual battery cells and they resist the expansion forces of those cells, thus ensuring high structural stability for the entire battery pack. Since specific expansion beams can only accommodate battery cells with varying expansion forces, different expansion beams must be selected for cells with different expansion forces. Furthermore, the expansion beams are usually welded to the housing. Therefore, when different expansion beams are required, the entire housing and the assembly process for the expansion beams must be redesigned, increasing the overall cost of the battery pack.

[0084] In view of this, this application provides a battery device including a housing, battery cells, and an expansion beam. The battery cells are housed within the housing, and the expansion beam is disposed within the housing. The expansion beam is detachably connected to the housing via a first fastener. By removing and installing the first fastener, the expansion beam adapted to the battery cell can be replaced without redesigning the housing, which helps reduce the design and manufacturing costs of the battery device. When maintenance is required, only the expansion beam needs to be replaced, without replacing the entire housing, which helps reduce the maintenance costs of the battery device and thus helps reduce the product cost of the battery device.

[0085] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0086] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0087] 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.

[0088] For example, Figure 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a fuel-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 vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 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. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0089] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 12 can directly form the battery device 100, or they can first be formed into battery modules, and then the battery modules can be combined to form the battery device 100.

[0090] For example, please refer to Figure 2, which is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing body 11, which has a hollow internal structure, and the plurality of battery cells 12 are housed within the housing body 11. As shown in Figure 2, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the shape of the combination of the plurality of battery cells 12. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 may be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing body 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the main body 11 of the housing formed by the first housing 111 and the second housing 112 being fastened together.

[0091] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for electrically connecting multiple battery cells 12, such as in parallel, series, or mixed connections. Specifically, the busbar component can achieve electrical connection between battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 14 via a conductive mechanism.

[0092] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery module. The number of battery cells 12 included in a battery module is unlimited and can be set according to requirements. The battery device 100 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0093] Please refer to Figure 3, which is an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity that can be used to accommodate the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0094] The battery cell 12 may also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211, which are respectively a positive electrode terminal and a negative electrode terminal. Each electrode terminal 123 is provided with a corresponding adapter piece 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be configured as a single unit or multiple units, and multiple independent electrode assemblies 122 are disposed within the battery cell 12.

[0095] According to some embodiments of this application, please refer to Figures 4-5. This application provides a battery device 100, which includes a housing 14, a battery cell 12, and an expansion beam 13. The battery cell 12 is housed within the housing 14, and the expansion beam 13 is disposed within the housing 14. The expansion beam 13 is detachably connected to the housing 14 by a first fastener 21.

[0096] In some embodiments, the housing 14 is formed by stamping a recess into a plate, and the recess forms an accommodating space in which the battery cell 12 and the expansion beam 13 are both housed.

[0097] The enclosure 14 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0098] The expansion beam 13 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0099] In some embodiments, please refer to FIG4, the number of expansion beams 13 is two, the two expansion beams 13 are arranged at intervals along the first direction X, and the battery cell 12 is located between the two expansion beams 13.

[0100] In some embodiments, the battery cell 12 includes an electrode assembly 122 and a housing 121. The electrode assembly 122 is housed in the housing 121. The thickness direction of the wall portion with the largest area of ​​the housing 121 is parallel to the first direction X. Hereinafter, the wall portion with the largest area of ​​the housing 121 is referred to as the large surface of the battery cell 12. Generally, the expansion force of the battery cell 12 will cause the large surface of the battery cell 12 to undergo a large deformation.

[0101] In some embodiments, the third direction Z, as described below, is parallel to the thickness direction of the bottom wall 141.

[0102] In some embodiments, the expansion beam 13 is formed by an extrusion process.

[0103] In some embodiments, the expansion beam 13 is formed by welding together multiple sheet metal pieces.

[0104] The battery cell 12 can be connected to the housing 14 by means of adhesive bonding or fastener connection. In some embodiments, the battery device 100 also includes other components, such as heat exchange tube 24, and the battery cell 12 can also be fixed to the surface of the heat exchange tube 24.

[0105] The expansion beam 13 can be a solid structure or a hollow structure. In some embodiments, the material and thickness of the expansion beam 13 can be changed to change the ability of the expansion beam 13 to resist expansion force.

[0106] The first fastener 21 can be a rivet nut and screw, a bolt and nut, a screw and nut, a rivet, etc. In some embodiments, the first fastener 21 includes a bolt and a nut, one of which can be pre-set on the expansion beam 13 or the housing 14, and then the two are mated together during assembly.

[0107] The expansion beam 13 is detachably connected to the housing 14 by the first fastener 21, which means that the expansion beam 13 can be separated from the housing 14 by removing the first fastener 21.

[0108] The first fastener 21 can be located inside the expansion beam 13, or all of the first fasteners 21 can be located outside the expansion beam 13.

[0109] In some embodiments, the housing 14 includes a bottom wall 141 and side walls 142 surrounding the bottom wall 141, and an expansion beam 13 may be detachably connected to the bottom wall 141. In other embodiments, the expansion beam 13 may be detachably connected to the side walls 142. In still other embodiments, the expansion beam 13 may be detachably connected to both the side walls 142 and the bottom wall 141. In yet another embodiment, the housing 14 may further include a lid, with the side walls 142 surrounding the bottom wall 141 and forming an opening, the lid covering the opening so that the housing 14 includes a sealed receiving cavity that houses the battery cell 12.

[0110] In some embodiments, the battery cell 12 abuts against the expansion beam 13 as soon as it begins to expand. In other embodiments, the battery cell 12 abuts against the expansion beam 13 only after it has expanded to a certain extent. After the battery cell 12 abuts against the expansion beam 13, the expansion beam 13 can provide a certain supporting force to the battery cell 12 to resist the expansion force of the battery cell 12. During the assembly of the housing 14 of the battery device 100, the size of the gap between the battery cell 12 and the expansion beam 13, or whether the battery cell 12 and the expansion beam 13 abut against each other after assembly, can be determined according to actual needs.

[0111] In some embodiments, referring to Figures 5 and 7, a third notch 1318 may also be provided on the expansion beam 13, and the battery device 100 further includes an output electrode base 18 disposed at the third notch 1318. In an embodiment where the battery device 100 includes two expansion beams 13 and a plurality of battery cells 12 are disposed between the two expansion beams 13, the third notch 1318 of one expansion beam 13 is provided with a positive output electrode base 18, and the third notch 1318 of the other expansion beam 13 is provided with a negative output electrode base 18.

[0112] In the technical solution of this application embodiment, the expansion beam 13 adapted to the battery cell 12 can be replaced by disassembling and assembling the first fastener 21, without the need to redesign the housing 14, which helps to reduce the design and manufacturing costs of the battery device 100. When the expansion beam 13 needs maintenance, only the expansion beam 13 needs to be replaced, without the need to replace the entire housing 14, which helps to reduce the maintenance costs of the battery device 100, and thus helps to reduce the product cost of the battery device 100.

[0113] According to some embodiments of this application, please refer to Figures 4-6 and 9. The housing 14 includes a bottom wall 141 and a first support 15. The first support 15 is connected to the bottom wall 141, and the expansion beam 13 is detachably connected to the first support 15 by a first fastener 21.

[0114] The first support 15 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0115] The cross-sectional shape of the first support 15 can be U-shaped, Z-shaped, H-shaped, Z-shaped, etc.

[0116] The first bracket 15 and the bottom wall 141 can be connected by means of bonding, fastener connection, welding, etc.

[0117] In some embodiments, the first bracket 15 is detachably connected to the bottom wall 141 by fasteners.

[0118] In some embodiments, referring to FIG9, the first support 15 is a beam extending along the second direction Y. The first support 15 includes a first wall, a second wall, and a third wall connected in sequence. The first wall and the third wall are disposed opposite to each other along the first direction X, and the second wall is disposed opposite to the bottom wall 141 along the thickness direction of the bottom wall 141. The support also includes a fourth wall and a fifth wall. The fourth wall extends from the end of the first wall away from the second wall in a direction away from the third wall, and the fifth wall extends from the end of the third wall away from the second wall in a direction away from the first wall. Both the fourth wall and the fifth wall are connected to the bottom wall 141.

[0119] In some embodiments, referring to FIG9, in the first direction X, a portion of the expansion beam 13 is located on the side of the first support 15 facing the battery cell 12. This arrangement allows a large portion of the battery cell 12 to be supported by the expansion beam 13 when it expands.

[0120] In some embodiments, the expansion beam 13 is disposed on the surface of the first support 15 that is furthest from the bottom wall 141 in the thickness direction of the bottom wall 141. This arrangement makes the assembly space between the expansion beam 13 and the first support 15 relatively large, which helps to reduce the assembly difficulty of the expansion beam 13 and the first support 15.

[0121] In some embodiments, the expansion beam 13 is directly connected to the wall of the housing 14 via a first fastener 21. The sealing requirements at the location where the first fastener 21 is installed in the housing 14 are relatively high. However, when the expansion beam 13 is installed on the first bracket 15 via the first fastener 21, the sealing requirements of the housing 14 itself are basically not considered when arranging the first fastener 21. For example, the first bracket 15 can be directly connected to the housing 14 by welding or bonding.

[0122] The first bracket 15 defines the boundaries of the battery cell 12 during assembly to some extent.

[0123] In some embodiments, a nut can be pre-set on the first bracket 15. When assembling the expansion beam 13, the assembly of the expansion beam 13 can be completed by assembling the screws or bolts that cooperate with the nut.

[0124] In the technical solution of this application embodiment, the first bracket 15 can provide a certain assembly space for the assembly of the first fastener 21, reducing the risk that the first fastener 21 is directly connected to the wall of the housing 14, which would increase the difficulty of sealing the housing 14. At the same time, the first bracket 15 can serve as the assembly base for the expansion beam 13, which can facilitate the pre-positioning of the expansion beam 13 and the positioning of the battery cell 12.

[0125] According to some embodiments of this application, referring to Figures 4-6, the housing 14 further includes a side wall 142 surrounding the bottom wall 141. The housing 14 also includes a second bracket 16 connected to the side wall 142, and the second bracket 16 is detachably connected to the expansion beam 13 by a second fastener 22.

[0126] The second support 16 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0127] In some embodiments, the second bracket 16 is detachably connected to the side wall 142. This arrangement allows the second bracket 16 to be separated from the housing 14 when assembling or removing the expansion beam 13, providing greater assembly space for the separation of the expansion beam 13 and the second bracket 16.

[0128] In some embodiments, the second bracket 16 may be fixed to the side wall 142 by means of welding or bonding.

[0129] The cross-sectional shape of the second support 16 can be U-shaped, L-shaped, Z-shaped, etc.

[0130] The second fastener 22 can be located inside the expansion beam 13, or it can be located entirely outside the expansion beam 13.

[0131] The second fastener 22 can be a rivet nut and screw, a bolt and nut, a screw and nut, a rivet, etc. In some embodiments, the second fastener 22 includes a bolt and a nut, one of which can be pre-set on the expansion beam 13 or the second bracket 16, and then the two are mated together during assembly.

[0132] The second support 16 can be a solid structure or a hollow structure.

[0133] In the above scheme, the second bracket 16 can improve the connection strength between the expansion beam 13 and the housing 14. At the same time, the second bracket 16 and the expansion beam 13 are detachably connected, which allows the battery device 100 to achieve lower design, manufacturing and maintenance costs.

[0134] According to some embodiments of this application, please refer to Figures 4-6, the second bracket 16 is connected to the side of the expansion beam 13 away from the battery cell 12.

[0135] Since the expansion force is transmitted from the side of the expansion beam 13 facing the battery cell 12 to the side of the expansion beam 13 away from the battery cell 12, the second bracket 16 is connected to the side of the expansion beam 13 away from the battery cell 12, which means that the second bracket 16 can provide a certain supporting force when the battery cell 12 expands.

[0136] The above scheme is beneficial to improving the ability of the expansion beam 13 to resist the expansion force of the battery cell 12.

[0137] According to some embodiments of this application, please refer to Figures 4-6. The second bracket 16 includes a first connecting part 161, a second connecting part 162 and a third connecting part 163 connected in sequence. The first connecting part 161 is connected to the side of the expansion beam 13 away from the battery cell 12, and the third connecting part 163 is connected to the side wall 142. The second connecting part 162, the side wall 142 and the expansion beam 13 enclose and form a first cavity 20.

[0138] Referring to Figure 6, the inclined arrangement of the second connecting part 162 in Figure 6 creates a triangular cavity between the second connecting part 162, the side wall 142, and the expansion beam 13, which helps to increase the support force of the second support 16 on the expansion beam 13. This also helps to disperse stress and reduce the risk of stress concentration.

[0139] In the above scheme, when the battery cell 12 expands, the second connecting part 162, the side wall 142 and the expansion beam 13 enclose and form the first cavity 20, which can better release the stress of the expansion beam 13, thereby improving the ability of the expansion beam 13 to resist the expansion force and improving the structural stability of the expansion beam 13.

[0140] According to some embodiments of this application, referring to Figures 4 and 9, the housing 14 further includes a third bracket 17, which is connected to the side wall 142. The third bracket 17 is connected to the expansion beam 13 on the side facing the battery cell 12 by a third fastener 23.

[0141] The third support 17 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0142] In some embodiments, the third bracket 17 is detachably connected to the side wall 142. This arrangement allows the third bracket 17 to be separated from the housing 14 when assembling or removing the expansion beam 13, providing greater assembly space for the separation of the expansion beam 13 and the third bracket 17.

[0143] In some embodiments, the third bracket 17 may be fixed to the side wall 142 by means of welding or bonding.

[0144] The cross-sectional shape of the third support 17 can be L-shaped or similar.

[0145] The third fastener 23 can be located inside the expansion beam 13, or it can be located entirely outside the expansion beam 13.

[0146] The third fastener 23 can be a rivet nut and screw, a bolt and nut, a screw and nut, a rivet, etc. In some embodiments, the third fastener 23 includes a bolt and a nut, one of which can be pre-set on the expansion beam 13 or the third bracket 17, and then the two are mated together during assembly.

[0147] The third support 17 can be a solid structure or a hollow structure.

[0148] In the above scheme, the placement of the third support 17 further improves the structural stability of the expansion beam 13 while enabling the battery device 100 to achieve lower design, manufacturing and maintenance costs.

[0149] According to some embodiments of this application, referring to Figures 4 and 9, the third bracket 17 includes a fourth connecting part 171 and a fifth connecting part 172 connected in sequence. The fourth connecting part 171 is connected to the side of the expansion beam 13 facing the battery cell 12, and the fifth connecting part 172 is connected to the side wall 142. The fifth connecting part 172 and the fourth connecting part 171 are perpendicular to each other.

[0150] Referring to Figure 9, the fifth connecting part 172 and the fourth connecting part 171 are perpendicular to each other, which means that the third bracket 17 occupies less space in the first direction X and the second direction Y, and the risk of interference between the battery cell 12 and the second bracket 16 is smaller.

[0151] In the above scheme, the fourth connecting part 171 is basically in contact with the expansion beam 13, and the fifth connecting part 172 is basically in contact with the side wall 142. There is a large space between the fourth connecting part 171 and the fifth connecting part 172, which reduces the risk of the energy density of the battery device 100 being reduced due to interference between the battery cell 12 and the third support 17.

[0152] According to some embodiments of this application, please refer to Figures 4-9. The expansion beam 13 is formed by welding together multiple sheet metal parts.

[0153] In some embodiments, the sheet metal parts are made of steel.

[0154] The expansion beam 13 can be assembled and welded from two, three, four, five, or six sheet metal pieces.

[0155] The expansion beam 13, which is assembled by welding, may or may not have internal space or cavity. For example, referring to 7, the expansion beam 13 has six cavities inside.

[0156] The weld can be a butt weld or a fillet weld.

[0157] The welding location can be the ends of two sheet metal parts, the end of one sheet metal part and the middle of another sheet metal part, or the middle of two sheet metal parts.

[0158] In the above solution, the expansion beam 13 can be manufactured by welding multiple sheet metal parts together at a lower cost. At the same time, the expansion beam 13 formed by welding multiple sheet metal parts together can be assembled or disassembled as an independent component, resulting in high assembly efficiency and relatively low assembly cost.

[0159] According to some embodiments of this application, referring to Figures 4-9, the expansion beam 13 includes a first sheet metal part 131, a second sheet metal part 132, and a third sheet metal part 133. The first sheet metal part 131 is located on the side of the expansion beam 13 facing the battery cell 12, and the third sheet metal part 133 is located on the side of the expansion beam 13 away from the battery cell 12. At least a portion of the second sheet metal part 132 is located between the first sheet metal part 131 and the third sheet metal part 133, and the second sheet metal part 132 divides the space between the first sheet metal part 131 and the third sheet metal part 133 into a plurality of second cavities.

[0160] In some embodiments, the second cavity is formed by stamping a plurality of protrusions on the surface of the second sheet metal part 132, the two opposite outer surfaces of the protrusions abutting against the first sheet metal part 131 and the third sheet metal part 133, respectively. The second cavity is formed inside the protrusions.

[0161] In some embodiments, the second cavity may be formed by a plurality of spaced grooves after the second sheet metal part 132 has been bent.

[0162] The second cavity can serve as a stress-relieving area; therefore, the expansion beam 13 has a second cavity, which is beneficial for stress dispersion.

[0163] In some embodiments, the surface of the first sheet metal part 131 is provided with a plurality of first through holes 1314. The provision of the first through holes 1314 can reduce the overall weight of the expansion beam 13, thereby increasing the energy density of the battery device 100. At the same time, the hole wall of the first through hole 1314 can serve as a welding reference for welding the second sheet metal part 132 to the first sheet metal part 131. For example, the first sheet metal part 131 and the second sheet metal part 132 can be welded together by extending the hole wall of the first through hole 1314. With this arrangement, the welding deformation is relatively small.

[0164] In some embodiments, the second sheet metal part 132 is provided with a plurality of through holes 1325 along the thickness direction of the bottom wall 141. This arrangement enables the expansion beam 13 to have a high resistance to expansion force while having a light weight, that is, to have a high mass energy density.

[0165] In the above scheme, the second sheet metal part 132 allows the multiple second cavities formed between the first sheet metal part 131 and the third sheet metal part 133 to serve as stress release areas, which is beneficial to improving the ability of the expansion beam 13 to resist expansion force and can also reduce the weight of the expansion beam 13, so that the battery device 100 can achieve a high mass energy density.

[0166] According to some embodiments of this application, please refer to Figures 4-9. The second sheet metal part 132 has a first groove 1321 on the side facing the first sheet metal part 131, and a second groove 1322 on the side facing the third sheet metal part 133. The first groove 1321 and the second groove 1322 are alternately arranged along the thickness direction of the bottom wall 141. The bottom wall of the first groove 1321 is connected to the third sheet metal part 133, and the bottom wall of the second groove 1322 is connected to the first sheet metal part 131.

[0167] In some embodiments, the first groove 1321 and the second groove 1322 both extend along the second direction Y and both extend to the edge of the second sheet metal part 132 in the second direction Y.

[0168] In some embodiments, since the expansion force is transmitted in the first direction X and the second direction Y is perpendicular to the first direction X, the bottom wall of the second groove 1322 can provide a certain support force for the first sheet metal part 131, reducing the risk of excessive deformation of the first sheet metal part 131.

[0169] Given a fixed total thickness of the expansion beam 13, the arrangement of the first groove 1321 and the second groove 1322 allows the expansion force to have a high resistance to expansion while maintaining a low weight.

[0170] The shape, number, and size of the first groove 1321 may be the same as or different from those of the second groove 1322.

[0171] In the above solution, alternating first grooves 1321 and second grooves 1322 are formed by bending the second sheet metal part 132, which reduces processing difficulty and cost. Simultaneously, the connection of the first sheet metal part 131 to the bottom wall of the second groove 1322 can, to some extent, improve the first sheet metal part 131's resistance to expansion forces, thereby enhancing the expansion beam 13's resistance to expansion forces.

[0172] According to some embodiments of this application, referring to Figures 4-9, the first sheet metal part 131 includes a first main body portion 1311 and a first flange portion 1312, the first flange portion 1312 being connected to the end of the first main body portion 1311 away from the bottom wall 141 in the thickness direction. The third sheet metal part 133 includes a third main body portion 1331 and a third flange portion 1332, the third flange portion 1332 being connected to the end of the third main body portion 1331 away from the bottom wall 141 in the thickness direction. The first flange portion 1312 and the third flange portion 1332 are welded together.

[0173] In some embodiments, the first flange 1312 and the third flange 1332 overlap, and welding is performed at the overlap position to form a connection between the two through a fillet weld.

[0174] Welding methods can include laser welding, arc welding, etc.

[0175] In the above scheme, welding the first flange 1312 and the third flange 1332 can reduce the risk of excessive deformation of the first main body 1311 and the third main body 1331 due to welding deformation, thereby improving the structural stability of the expansion beam 13.

[0176] According to some embodiments of this application, referring to Figures 4-9, the first sheet metal part 131 further includes a fourth flange portion 1313, which is connected to the end of the first main body part 1311 near the bottom wall 141 in the thickness direction. The fourth flange portion 1313 is detachably connected to the first bracket 15 via a first fastener 21.

[0177] The fourth flange 1313 is detachably connected to the first bracket 15 via the first fastener 21. This means that in embodiments where the expansion beam 13 is formed by welding multiple sheet metal parts, the first fastener 21 can be assembled with the first bracket 15 by passing through one of the sheet metal parts. This helps reduce the risk that positional tolerances in the holes for fasteners on different sheet metal parts could prevent the first fastener 21 from smoothly passing through multiple sheet metal parts, thus increasing the assembly difficulty.

[0178] The fourth flange 1313 is located on the side of the expansion beam 13 away from the battery cell 12. It can provide a relatively large assembly space for the first sheet metal part 131, thereby reducing the assembly difficulty of the battery device 100.

[0179] In the above scheme, by setting the fourth flange 1313, the assembly space is larger when the first fastener 21 is assembled, thereby making the assembly between the expansion beam 13 and the first bracket 15 easier.

[0180] According to some embodiments of this application, referring to Figures 4-9, the second sheet metal part 132 includes a second main body portion 1323 and a second flange portion 1324. The second flange portion 1324 is connected to the end of the second main body portion 1323 near the bottom wall 141 in the thickness direction. The expansion beam 13 also includes a fourth sheet metal part 134. The second flange portion 1324 is located between the first flange portion 1312 and the fourth sheet metal part 134. The first flange portion 1312, the second flange portion 1324, and the fourth sheet metal part 134 are welded together.

[0181] In some embodiments, referring to Figures 7-10, the first flange 1312, the second flange 1324, and the fourth sheet metal part 134 overlap at least partially, and the overlapping area can be used as the welding area.

[0182] Welding methods can include laser welding or arc welding, etc.

[0183] In the above solution, the first sheet metal part 131, the second sheet metal part 132 and the fourth sheet metal part 134 can be connected by a single welding, resulting in higher assembly efficiency.

[0184] According to some embodiments of this application, please refer to Figures 4-9. The second flange portion 1324 is provided with a first notch 13241, and the fourth sheet metal part 134 is provided with a second notch 13421. The first notch 13241 and the second notch 13421 are positioned correspondingly. The first flange portion 1312 includes a first part 13131 and a second part 13132. The first part 13131 is welded to the second flange portion 1324 and the fourth sheet metal part 134. The second part 13132 is exposed through the first notch 13241 and the second notch 13421 and is connected to the first bracket 15.

[0185] Both the first notch 13241 and the second notch 13421 can avoid the first fastener 21, so that the first fastener 21 can be connected to the first bracket 15 by passing through a sheet metal part.

[0186] In some embodiments, the surface of the second portion 13132 facing the bottom wall 141, the surface of the fifth flange portion 1342 facing away from the bottom wall 141, and the surface of the first bracket 15 furthest from the bottom wall 141 are coplanar. This arrangement allows the expansion beam 13 and the first bracket 15 to fit more tightly, and while the expansion beam 13 has high structural strength, it also makes the assembly of the battery device 100 relatively easier.

[0187] In the above scheme, due to the setting of the first notch 13241 and the second notch 13421, the assembly difficulty is relatively low, and the connection stability between the expansion beam 13 and the first support 15 is also relatively high.

[0188] According to some embodiments of this application, referring to Figures 4-9, the second portion 13132 protrudes from the first portion 13131 in a direction close to the bottom wall 141.

[0189] The second part 13132 protrudes from the first part 13131 in a direction close to the bottom wall 141, which means that the surface of the second part 13132 on the side away from the bottom wall 141 will form a recess corresponding to the position of the protrusion, and the recess can accommodate part of the first fastener 21, which is beneficial to improving the energy density of the battery device 100.

[0190] In the above scheme, since the second part 13132 protrudes from the first part 13131 in the direction close to the bottom wall 141, the assembly between the expansion beam 13 and the first support 15 can be completed to a certain extent without changing the shape of the connecting surface of the first support 15, and the processing cost is relatively low.

[0191] According to some embodiments of this application, referring to Figures 4-9, the fourth sheet metal part 134 includes a fourth main body portion 1341 and a fifth flange portion 1342. The fifth flange portion 1342 is connected to the end of the fourth main body portion 1341 away from the bottom wall 141 in the thickness direction. A second notch 13421 is provided in the fifth flange portion 1342. At least a portion of the fourth main body portion 1341 is located on the side of the first bracket 15 facing the battery cell 12.

[0192] Referring to Figure 9, most of the large surface of the battery cell 12 will come into contact with the expansion beam 13 or the first support 15 after expanding for a certain period of time. Since at least a portion of the fourth main body 1341 is located on the side of the first support 15 facing the battery cell 12, it can better resist the expansion force at various positions of the large surface of the battery cell 12.

[0193] In the above scheme, at least a portion of the fourth main body 1341 is located on the side of the first support 15 facing the battery cell 12, so that when the battery cell 12 expands and deforms, most of its area can be supported by the expansion beam 13, thereby improving the reliability of the battery device 100.

[0194] According to some embodiments of this application, referring to Figures 4-9, the fourth sheet metal part 134 further includes a sixth flange 1343, which is connected to the end of the fourth main body part 1341 near the bottom wall 141 in the thickness direction. The third sheet metal part 133 further includes a seventh flange 1333, which is connected to the end of the third main body part 1331 near the bottom wall 141 in the thickness direction. The sixth flange 1343 and the seventh flange 1333 are connected.

[0195] The connection between the sixth flange 1343 and the seventh flange 1333 can be welding or fastener connection, etc.

[0196] In some embodiments, the sixth flange 1343 and the seventh flange 1333 overlap, and welding is performed at the overlap position to form a connection between the two through a fillet weld. The welding method can be laser welding, arc welding, etc.

[0197] In the above scheme, the connection between the sixth flange 1343 and the seventh flange 1333 can reduce the risk of excessive deformation of the third main body 1331 and the fourth main body 1341 due to assembly stress, thereby improving the structural stability of the expansion beam 13.

[0198] According to some embodiments of this application, referring to Figures 4-9, multiple battery cells 12 are provided, arranged in multiple rows. Each row of battery cells 12 includes multiple battery cells 12 arranged along a first direction X. The multiple rows of battery cells 12 are arranged along a second direction Y. The first direction X, the second direction Y, and the thickness direction of the bottom wall 141 are perpendicular to each other. Two expansion beams 13 and two first supports 15 are provided. The first supports 15 are arranged one-to-one with the expansion beams 13. The two expansion beams 13 are spaced apart along the first direction X. In the first direction X, the battery cell 12 is located between the two expansion beams 13.

[0199] In the first direction X, the battery cell 12 is located between two expansion beams 13, which means that the two expansion beams 13 can resist the expansion force of the battery cell 12 in the first direction X.

[0200] In the above scheme, the two expansion beams 13 can resist the expansion force of the battery cell 12 in the first direction X, so as to reduce the risk of excessive deformation of the box 14 and sealing failure due to the expansion and deformation of the battery cell 12.

[0201] According to some embodiments of this application, please refer to Figures 4-9. The battery device 100 further includes a pressure strip 19, which extends along a first direction X. The two ends of the pressure strip 19 are respectively connected to two expansion beams 13. The pressure strip 19 is pressed against the side of the battery cell 12 away from the bottom wall 141.

[0202] The materials used for the molding strip can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0203] In some embodiments, the pressure strip can connect the battery cell 12 and the expansion beam 13 via an adhesive.

[0204] In other embodiments, holes for fasteners may be pre-drilled on the expansion beam 13. The fasteners may be rivet nuts and screws, bolts and nuts, screws and nuts, rivets, etc. Pressure strips can be connected to the expansion beam 13 via fasteners.

[0205] In the above scheme, the setting of the pressure strip 19 can compress the battery cell 12, reduce the risk of the battery cell 12 shaking, and make the battery device 100 have high structural stability.

[0206] According to some embodiments of this application, please refer to Figures 4-10. The two expansion beams 13 are the first expansion beam and the second expansion beam, respectively. The battery device 100 includes a heat exchange tube 24, an inlet water nozzle 25, and an outlet water nozzle 26. The heat exchange tube 24 is disposed on the bottom wall 141 and passes through the first bracket 15 corresponding to the first expansion beam. The inlet water nozzle 25 and the outlet water nozzle 26 are located on the side of the first expansion beam away from the battery cell 12, and both the inlet water nozzle 25 and the outlet water nozzle 26 are connected to the heat exchange tube 24.

[0207] A heat exchange medium is installed inside the heat exchange tube 24 to regulate the temperature of the battery cell 12. The heat exchange medium can be water, gas, etc.

[0208] In some embodiments, thermally conductive adhesive is filled between the heat exchange tube 24 and the battery cell 12, and the battery cell 12 is connected to the heat exchange tube 24 and the bottom wall 141 through the thermally conductive adhesive.

[0209] In some embodiments, referring to Figure 10, the housing 14 is a stamped housing. During the stamping process of the housing 14, multiple protrusions can be formed on the bottom wall 141 simultaneously through mold design. The protrusions can define the assembly position of the heat exchange tube 24, and at the same time, the protrusions can fill the gaps formed after the heat exchange tube 24 is bent, which can reduce the amount of thermally conductive adhesive used and thus save costs. In other embodiments, the surface of the protrusion facing the battery cell 12 is flush with the surface of the heat exchange tube 24 facing the battery cell 12, which is beneficial to improving the structural stability of the battery cell 12 after assembly.

[0210] The heat exchange tube 24 can be either a round tube or a flat tube.

[0211] Please refer to Figures 4 and 5. In Figure 4, the expansion beam 13 on the left is the first expansion beam, and the expansion beam 13 on the right is the second expansion beam.

[0212] In some embodiments, the first expansion beam and the second expansion beam divide the accommodating space within the housing 14 into an electrical compartment and an installation compartment spaced apart along a first direction X. The sidewall 142 includes a first sidewall and a second sidewall disposed opposite each other along the first direction X, and a third sidewall and a fourth sidewall disposed opposite each other along a second direction Y. The first sidewall, the third sidewall, the fourth sidewall, and the first expansion beam together define the electrical compartment, which houses components such as a battery device management system and a high-voltage box. An inlet water nozzle 25 and an outlet water nozzle 26 are located within the electrical compartment. The third sidewall, the fourth sidewall, the first expansion beam, and the second expansion beam together define the installation compartment, where a battery cell 12 is disposed.

[0213] In the above scheme, the inlet water nozzle 25 and the outlet water nozzle 26 are located on the side of the first expansion beam away from the battery cell 12, and will not occupy the space between the first expansion beam and the second expansion beam. This allows most of the battery cells 12 between the first expansion beam and the second expansion beam to be supported by the first expansion beam and the second expansion beam, which is beneficial to improving the reliability of the battery device 100.

[0214] According to some embodiments of this application, this application provides an electrical device including a battery device 100 as described in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0215] In the above solutions, since the battery device 100 in one or more of the above embodiments has a low product cost, the power supply device including the battery device 100 in one or more of the above embodiments also has a low cost.

[0216] According to some embodiments of this application, referring to Figures 4-10, this application provides a battery device 100. The battery device 100 includes a housing 14, a battery cell 12, an expansion beam 13, and a heat exchange tube 24. The battery cell 12 is housed in the housing 14, and the expansion beam 13 is disposed in the housing 14.

[0217] The housing 14 includes a bottom wall 141, a side wall 142, a first bracket 15, a second bracket 16, and a third bracket 17. The side wall 142 surrounds the bottom wall 141. The first bracket 15 is connected to the bottom wall 141. The expansion beam 13 is detachably connected to the first bracket 15 via a first fastener 21. The housing 14 also includes a second bracket 16, which is connected to the side wall 142 and detachably connected to the expansion beam 13 via a second fastener 22. The second bracket 16 is connected to the side of the expansion beam 13 facing away from the battery cell 12. The third bracket 17 is connected to the side wall 142 and is connected to the side of the expansion beam 13 facing the battery cell 12 via a third fastener 23.

[0218] The second support 16 includes a first connecting portion 161, a second connecting portion 162, and a third connecting portion 163 connected in sequence. The first connecting portion 161 is connected to the side of the expansion beam 13 facing away from the battery cell 12, and the third connecting portion 163 is connected to the side wall 142. The second connecting portion 162, the side wall 142, and the expansion beam 13 enclose and form a first cavity 20. The third support 17 includes a fourth connecting portion 171 and a fifth connecting portion 172 connected in sequence. The fourth connecting portion 171 is connected to the side of the expansion beam 13 facing the battery cell 12, and the fifth connecting portion 172 is connected to the side wall 142. The fifth connecting portion 172 and the fourth connecting portion 171 are perpendicular to each other.

[0219] The expansion beam 13 is formed by welding together multiple sheet metal parts. The expansion beam 13 includes a first sheet metal part 131, a second sheet metal part 132, and a third sheet metal part 133. The first sheet metal part 131 is located on the side of the expansion beam 13 facing the battery cell 12, and the third sheet metal part 133 is located on the side of the expansion beam 13 away from the battery cell 12. At least a portion of the second sheet metal part 132 is located between the first sheet metal part 131 and the third sheet metal part 133, and the second sheet metal part 132 divides the space between the first sheet metal part 131 and the third sheet metal part 133 into multiple second cavities. The second sheet metal part 132 has a first groove 1321 on the side facing the first sheet metal part 131, and a second groove 1322 on the side facing the third sheet metal part 133. The first groove 1321 and the second groove 1322 are alternately arranged along the thickness direction of the bottom wall 141. The bottom wall of the first groove 1321 is connected to the third sheet metal part 133, and the bottom wall of the second groove 1322 is connected to the first sheet metal part 131. The first sheet metal part 131 includes a first main body portion 1311 and a first flange portion 1312. The first flange portion 1312 is connected to the end of the first main body portion 1311 that is away from the bottom wall 141 in the thickness direction. The third sheet metal part 133 includes a third main body portion 1331 and a third flange portion 1332. The third flange portion 1332 is connected to the end of the third main body portion 1331 that is away from the bottom wall 141 in the thickness direction. The first flange 1312 and the third flange 1332 are welded together. The first sheet metal part 131 also includes a fourth flange 1313, which is connected to the end of the first main body 1311 near the bottom wall 141 in the thickness direction. The fourth flange 1313 is detachably connected to the first bracket 15 via a first fastener 21. The second sheet metal part 132 includes a second main body 1323 and a second flange 1324, which is connected to the end of the second main body 1323 near the bottom wall 141 in the thickness direction. The expansion beam 13 also includes a fourth sheet metal part 134, with the second flange 1324 located between the first flange 1312 and the fourth sheet metal part 134. The first flange 1312, the second flange 1324, and the fourth sheet metal part 134 are welded together. The second flange portion 1324 is provided with a first notch 13241, and the fourth sheet metal part 134 is provided with a second notch 13421. The first notch 13241 and the second notch 13421 are positioned correspondingly. The first flange portion 1312 includes a first part 13131 and a second part 13132. The first part 13131 is welded to the second flange portion 1324 and the fourth sheet metal part 134. The second part 13132 is exposed through the first notch 13241 and the second notch 13421 and is connected to the first bracket 15. The second part 13132 protrudes from the first part 13131 in a direction close to the bottom wall 141.The fourth sheet metal part 134 includes a fourth main body portion 1341 and a fifth flange portion 1342. The fifth flange portion 1342 is connected to the end of the fourth main body portion 1341 away from the bottom wall 141 in the thickness direction. A second notch 13421 is provided in the fifth flange portion 1342. At least a portion of the fourth main body portion 1341 is located on the side of the first bracket 15 facing the battery cell 12. The fourth sheet metal part 134 also includes a sixth flange portion 1343, which is connected to the end of the fourth main body portion 1341 near the bottom wall 141 in the thickness direction. The third sheet metal part 133 also includes a seventh flange portion 1333, which is connected to the end of the third main body portion 1331 near the bottom wall 141 in the thickness direction. The sixth flange portion 1343 is connected to the seventh flange portion 1333.

[0220] The heat exchange tube 24 is installed on the bottom wall 141, and the expansion beam 13 is provided with a fourth notch 1344, which can avoid the part of the heat exchange tube 24 that passes through the first support 15.

[0221] The expansion beam 13, which is compatible with the battery cell 12, can be replaced by disassembling and assembling the first fastener 21, the second fastener 22, and the third fastener 23, without the need to redesign the housing 14, which helps reduce the design and manufacturing costs of the battery device 100. When the expansion beam 13 requires maintenance, it can be replaced without replacing the entire housing 14, which helps reduce the maintenance costs of the battery device 100 and thus the product cost of the battery device 100. The second bracket 16, while ensuring low design, manufacturing, and maintenance costs, also improves the connection strength between the expansion beam 13 and the housing 14, as well as the ability of the expansion beam 13 to resist expansion forces.

[0222] 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 device, characterized in that, include: Box; The battery cell is housed within the casing; An expansion beam is installed inside the box. The expansion beam is detachably connected to the box body via a first fastener.

2. The battery device according to claim 1, characterized in that, The housing includes a bottom wall and a first support, the first support being connected to the bottom wall, and the expansion beam being detachably connected to the first support via the first fastener.

3. The battery device according to claim 2, characterized in that, The enclosure also includes side walls that surround the bottom wall; The housing also includes a second bracket, which is connected to the side wall and is detachably connected to the expansion beam via a second fastener.

4. The battery device according to claim 3, characterized in that, The second bracket is connected to the side of the expansion beam opposite to the battery cell.

5. The battery device according to claim 3 or 4, characterized in that, The second bracket includes a first connecting part, a second connecting part, and a third connecting part connected in sequence. The first connecting part is connected to the side of the expansion beam away from the battery cell, and the third connecting part is connected to the side wall. The second connecting part, the side wall, and the expansion beam enclose a first cavity.

6. The battery device according to any one of claims 3-5, characterized in that, The housing also includes a third bracket, which is connected to the side wall and is connected to the expansion beam on the side facing the battery cell by a third fastener.

7. The battery device according to claim 6, characterized in that, The third bracket includes a fourth connecting part and a fifth connecting part connected in sequence. The fourth connecting part is connected to the side of the expansion beam facing the battery cell, and the fifth connecting part is connected to the side wall. The fifth connecting part and the fourth connecting part are perpendicular to each other.

8. The battery device according to any one of claims 2-7, characterized in that, The expansion beam is formed by welding together multiple sheet metal parts.

9. The battery device according to claim 8, characterized in that, The expansion beam includes a first sheet metal part, a second sheet metal part, and a third sheet metal part. The first sheet metal part is located on the side of the expansion beam facing the battery cell, and the third sheet metal part is located on the side of the expansion beam away from the battery cell. At least a portion of the second sheet metal part is located between the first sheet metal part and the third sheet metal part, and the second sheet metal part divides the space between the first sheet metal part and the third sheet metal part into a plurality of second cavities.

10. The battery device according to claim 9, characterized in that, The second sheet metal part has a first groove on the side facing the first sheet metal part and a second groove on the side facing the third sheet metal part. The first groove and the second groove are alternately arranged along the thickness direction of the bottom wall. The bottom wall of the first groove is connected to the third sheet metal part, and the bottom wall of the second groove is connected to the first sheet metal part.

11. The battery device according to claim 9 or 10, characterized in that, The first sheet metal part includes a first main body and a first flange, wherein the first flange is connected to the end of the first main body away from the bottom wall in the thickness direction of the bottom wall; The third sheet metal part includes a third main body and a third flange, wherein the third flange is connected to the end of the third main body away from the bottom wall in the thickness direction of the bottom wall; The first flange and the third flange are welded together.

12. The battery device according to claim 11, characterized in that, The first sheet metal part further includes a fourth flange portion, which is connected to the end of the first main body portion near the bottom wall in the thickness direction of the bottom wall; The fourth flange is detachably connected to the first bracket via the first fastener.

13. The battery device according to claim 11 or 12, characterized in that, The second sheet metal part includes a second main body and a second flange, wherein the second flange is connected to one end of the second main body near the bottom wall in the thickness direction of the bottom wall; The expansion beam also includes a fourth sheet metal part, the second flange is located between the first flange and the fourth sheet metal part, and the first flange, the second flange and the fourth sheet metal part are welded together.

14. The battery device according to claim 13, characterized in that, The second flange is provided with a first notch, and the fourth sheet metal part is provided with a second notch. The first notch and the second notch are in corresponding positions. The first flange includes a first part and a second part. The first part is welded to the second flange and the fourth sheet metal part. The second part is exposed by the first notch and the second notch and is connected to the first bracket.

15. The battery device according to claim 14, characterized in that, The second portion protrudes from the first portion toward the direction of the bottom wall.

16. The battery device according to claim 14 or 15, characterized in that, The fourth sheet metal part includes a fourth main body and a fifth flange, the fifth flange being connected to the end of the fourth main body away from the bottom wall in the thickness direction, and the second notch being provided in the fifth flange; At least a portion of the fourth main body is located on the side of the first bracket facing the battery cell.

17. The battery device according to claim 16, characterized in that, The fourth sheet metal part also includes a sixth flange, which is connected to the end of the fourth main body part near the bottom wall in the thickness direction of the bottom wall; The third sheet metal part also includes a seventh flange, which is connected to the end of the third main body part near the bottom wall in the thickness direction of the bottom wall; The sixth flange is connected to the seventh flange.

18. The battery device according to any one of claims 2-17, characterized in that, The battery cells are provided in multiple rows, and each row of battery cells includes multiple battery cells arranged along a first direction. The multiple rows of battery cells are arranged along a second direction, and the first direction, the second direction and the thickness direction of the bottom wall are perpendicular to each other. Two expansion beams and two first supports are provided. The first support is provided in a one-to-one correspondence with the expansion beams. The two expansion beams are spaced apart along the first direction. In the first direction, the battery cell is located between the two expansion beams.

19. The battery device according to claim 18, characterized in that, The battery device further includes a pressure strip that extends along the first direction. The two ends of the pressure strip are respectively connected to the two expansion beams, and the pressure strip is pressed against the side of the battery cell away from the bottom wall.

20. The battery device according to claim 18 or 19, characterized in that, The two expansion beams are the first expansion beam and the second expansion beam, respectively; The battery device includes a heat exchange tube, an inlet water nozzle, and an outlet water nozzle. The heat exchange tube is disposed on the bottom wall and passes through the first bracket corresponding to the first expansion beam. The inlet water nozzle and the outlet water nozzle are located on the side of the first expansion beam away from the battery cell. Both the inlet water nozzle and the outlet water nozzle are connected to the heat exchange tube.

21. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-20, the battery device being used to provide electrical energy.

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