Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a box body, a battery monomer and an expansion beam, the battery monomer is accommodated in the box body, and the expansion beam is arranged in the box body. Wherein the expansion beam is detachably connected with the box body through a first fastener. The expansion beams matched with the battery monomers can be replaced by disassembling and assembling the first fasteners, the box body does not need to be redesigned, and the design and manufacturing cost of the battery device can be reduced. When the expansion beam needs to be maintained, only the expansion beam needs to be replaced, and the box body does not need to be integrally replaced, so that the maintenance cost of the battery device is reduced, and the product cost of the battery device is further reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a battery device and an electrical device. Background Art

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

[0003] How to reduce the product cost of battery devices is an urgent problem to be solved in battery technology. Summary of the Utility Model

[0004] In view of the above problems, this application provides a battery device and an electrical device, which can reduce the product cost of the battery device.

[0005] In a first aspect, this application provides a battery device. The battery device includes a box body, battery cells, and an expansion beam. The battery cells are received in the box body, and the expansion beam is disposed in the box body. Among them, the expansion beam is detachably connected to the box body through a first fastener.

[0006] In the technical solution of the embodiment of this application, the expansion beam adapted to the battery cells can be replaced by disassembling and assembling the first fastener, without the need to re-design the box body, which is beneficial to reducing the design and manufacturing costs of the battery device. When the expansion beam needs to be maintained, only the expansion beam needs to be replaced, without the need to replace the box body as a whole, which is beneficial to reducing the maintenance cost of the battery device, and thus beneficial to reducing the product cost of the battery device.

[0007] In one or more embodiments of the first aspect, the box body includes a bottom wall and a first bracket. The first bracket is connected to the bottom wall, and the expansion beam is detachably connected to the first bracket through a first fastener.

[0008] In the technical solution of the embodiment of this application, the setting of the first bracket can provide a certain assembly space for the assembly of the first fastener, reducing the risk that the first fastener is directly connected to the wall of the box body, resulting in an increased difficulty in sealing the box body. 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 also facilitating the positioning of the battery cells.

[0009] In one or more embodiments of the first aspect, the box body further includes a side wall surrounding the periphery of the bottom wall. The box body further includes a second bracket connected to the side wall, and the second bracket is detachably connected to the expansion beam through a second fastener.

[0010] In the above solution, the provision of the second bracket can improve the connection strength between the expansion beam and the box body. At the same time, the second bracket is detachably connected to the expansion beam, enabling the battery device to take into account lower design, manufacturing, and maintenance costs.

[0011] In one or more embodiments of the first aspect, the second bracket is connected to the side of the expansion beam facing away from the battery cell.

[0012] In the above solution, when the battery cell expands, the second bracket can provide a certain holding force, which is beneficial to improving the ability of the expansion beam to resist the expansion force of the battery cell.

[0013] In one or more embodiments of the first aspect, the second bracket includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion is connected to the side of the expansion beam facing away from the battery cell, the third connecting portion is connected to the side wall, and the second connecting portion, the side wall, and the expansion beam enclose a first cavity.

[0014] In the above solution, when the battery cell expands, since the second connecting portion, the side wall, and the expansion beam enclose a first cavity, the stress of the expansion beam can be better released, thereby improving the ability of the expansion beam to resist the expansion force and being beneficial to improving the structural stability of the expansion beam.

[0015] In one or more embodiments of the first aspect, the box body further includes a third bracket. The third bracket is connected to the side wall, and the third bracket is connected to the expansion beam on the side facing the battery cell through a third fastener.

[0016] In the above solution, the provision of the third bracket further improves the structural stability of the expansion beam while enabling the battery device to take into account lower design, manufacturing, and maintenance costs.

[0017] 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 is connected to the side of the expansion beam facing the battery cell, the fifth connecting portion is connected to the side wall, and the fifth connecting portion and the fourth connecting portion are perpendicular to each other.

[0018] In the above solution, the fourth connecting portion is substantially in contact with the expansion beam, the fifth connecting portion is substantially in contact with the side wall, and there is a relatively large space between the fourth connecting portion and the fifth connecting portion, reducing the risk of reducing the energy density of the battery device due to interference between the battery cell and the third bracket.

[0019] In one or more embodiments of the first aspect, the expansion beam is formed by welding a plurality of sheet metal parts.

[0020] In the above solution, the expansion beam formed by welding multiple sheet metal parts can be manufactured at a low cost. At the same time, the expansion beam formed by welding multiple sheet metal parts can be assembled or disassembled as an independent component, which has high assembly efficiency and relatively low assembly cost.

[0021] In one or more embodiments of the first aspect, the expansion beam includes a first sheet metal member, a second sheet metal member, and a third sheet metal member, the first sheet metal member is located on a side of the expansion beam facing the battery cell, the third sheet metal member is located on a side of the expansion beam facing away from the battery cell, at least a portion of the second sheet metal member is located between the first sheet metal member and the third sheet metal member, and the second sheet metal member divides the space between the first sheet metal member and the third sheet metal member into a plurality of second cavities.

[0022] In the above solution, the second sheet metal part enables the multiple second cavities formed between the first sheet metal part and the third sheet metal part to be used as stress release areas, which is beneficial to improving the ability of the expansion beam to resist expansion force, and can also reduce the weight of the expansion beam, so that the battery device has a higher mass energy density.

[0023] In one or more embodiments of the first aspect, the second sheet metal part has a first groove on a side facing the first sheet metal part, and the second sheet metal part has a second groove on a 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.

[0024] In the above solution, the alternating first and second grooves are formed by bending the second sheet metal member, which is easy to process and has low processing costs. Furthermore, the connection between the bottom wall of the second groove and the first sheet metal member can improve the first sheet metal member's ability to resist expansion forces, thereby improving the expansion beam's ability to resist expansion forces.

[0025] In one or more embodiments of the first aspect, the first sheet metal component 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 distal from the bottom wall in the thickness direction of the bottom wall. The third sheet metal component 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 distal from the bottom wall in the thickness direction of the bottom wall. The first flange portion and the third flange portion are welded.

[0026] In the above solution, welding the first flange portion and the third flange portion can reduce the risk of excessive deformation of the first main portion and the third main portion due to welding deformation, thereby facilitating improvement of the structural stability of the expansion beam.

[0027] In one or more embodiments of the first aspect, the first sheet metal member further includes a fourth flange portion connected to an end of the first main body portion that is closer to the bottom wall in a thickness direction of the bottom wall. The fourth flange portion is detachably connected to the first bracket via a first fastener.

[0028] In the above solution, by providing the fourth flanging portion, a larger assembly space is created during the assembly of the first fastener, thereby reducing the assembly difficulty between the expansion beam and the first bracket.

[0029] In one or more embodiments of the first aspect, the second sheet metal part includes a second main body portion and a second flanging portion, and the second flanging portion is connected to one end of the second main body portion close to the bottom wall in the thickness direction of the bottom wall. The expansion beam further includes a fourth sheet metal part, the second flanging portion is located between the first flanging portion and the fourth sheet metal part, and the first flanging portion, the second flanging portion and the fourth sheet metal part are welded.

[0030] In the above solution, by welding once, a connection can be formed among the first sheet metal part, the second sheet metal part and the fourth sheet metal part, and the assembly efficiency is higher.

[0031] In one or more embodiments of the first aspect, the second flanging portion is provided with a first notch, the fourth sheet metal part is provided with a second notch, the positions of the first notch and the second notch correspond to each other, the first flanging portion includes a first part and a second part, the first part is welded to the second flanging portion and the fourth sheet metal part, and the second part is exposed by the first notch and the second notch and is connected to the first bracket.

[0032] In the above solution, due to the provision of the first notch and the second notch, the first fastener can be connected to the first bracket by passing through one sheet metal part, the assembly difficulty is relatively low, and the connection stability between the expansion beam and the first bracket is also relatively high.

[0033] In one or more embodiments of the first aspect, the second part protrudes towards the bottom wall relative to the first part.

[0034] In the above solution, since the second part protrudes towards the bottom wall relative to the first part, the assembly between the expansion beam and the first bracket can be completed without changing the shape of the connection surface of the first bracket to a certain extent, and the processing cost is relatively low.

[0035] In one or more embodiments of the first aspect, the fourth sheet metal part includes a fourth main body portion and a fifth flanging portion, the fifth flanging portion is connected to one end of the fourth main body portion away from the bottom wall in the thickness direction of the bottom wall, and the second notch is provided on the fifth flanging portion. At least part of the fourth main body portion is located on the side of the first bracket facing the battery cell.

[0036] In the above solution, at least part of the fourth main body portion being located on the side of the first bracket facing the battery cell enables most regions of the battery cell to be resisted by the expansion beam when the battery cell expands and deforms, which is beneficial to improving the reliability of the battery device.

[0037] In one or more embodiments of the first aspect, the fourth sheet metal component further includes a sixth flange portion connected to an end of the fourth main body portion, closer to the bottom wall, in the thickness direction of the bottom wall. The third sheet metal component further includes a seventh flange portion connected to an end of the third main body portion, closer to the bottom wall, in the thickness direction of the bottom wall. The sixth flange portion is connected to the seventh flange portion.

[0038] In the above solution, the connection between the sixth flange portion and the seventh flange portion can reduce the risk of excessive deformation of the third main body portion and the fourth main body portion due to assembly stress, thereby facilitating improvement of the structural stability of the expansion beam.

[0039] In one or more embodiments of the first aspect, a plurality of battery cells are provided, and the plurality of battery cells are 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 brackets are provided, and the first brackets are provided in a one-to-one correspondence with the expansion beams. 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.

[0040] In the above solution, the two expansion beams can resist the expansion force of the battery cell in the first direction, so as to reduce the risk of excessive deformation of the box body and sealing failure due to the expansion and deformation of the battery cell.

[0041] In one or more embodiments of the first aspect, the battery device further includes a pressure strip extending along the first direction, with both ends of the pressure strip respectively connected to the two expansion beams, and the pressure strip is pressed against a side of the battery cell facing away from the bottom wall.

[0042] In the above solution, the provision of the pressure strips can compress the battery cells, thereby reducing the risk of shaking of the battery cells and providing the battery device with higher structural stability.

[0043] In one or more embodiments of the first aspect, the two expansion beams are respectively a first expansion beam and a second expansion beam. The battery device includes a heat exchange tube, a liquid inlet nozzle, and a liquid outlet nozzle. The heat exchange tube is disposed on the bottom wall and passes through a first bracket corresponding to the first expansion beam. The liquid inlet nozzle and the liquid outlet nozzle are located on a side of the first expansion beam facing away from the battery cell, and both the liquid inlet nozzle and the liquid outlet nozzle are connected to the heat exchange tube.

[0044] In the above scheme, the liquid inlet nozzle and the liquid outlet nozzle are arranged on the side of the first expansion beam away from the battery cell, and will not occupy the space between the first expansion beam and the second expansion beam. Therefore, most of the battery cells between the first expansion beam and the second expansion beam can be provided with support force by the first expansion beam and the second expansion beam, which is beneficial to improving the reliability of the battery device.

[0045] In a second aspect, the present application provides an electrical device, including the battery device in one or more embodiments of the first aspect, and the battery device is used to provide electrical energy.

[0046] In the above solution, since the battery device in one or more embodiments of the first aspect has a low product cost, the electrical device including the battery device in one or more embodiments of the first aspect also has a low cost.

[0047] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0049] Figure 1 is a schematic structural diagram of a vehicle in some embodiments of the present application;

[0050] Figure 2 is an exploded view of a battery device in some embodiments of the present application;

[0051] Figure 3 is an exploded view of a battery cell in some embodiments of the present application;

[0052] Figure 4 is an axonometric view of a partial structure of a battery device in some other embodiments of the present application;

[0053] Figure 5 is Figure 4 a partial enlarged view of part A in

[0054] Figure 6 is Figure 4 a partial enlarged view of part B in

[0055] Figure 7 is an axonometric view of an expansion beam in some other embodiments of the present application;

[0056] Figure 8 is an exploded view of an expansion beam in some other embodiments of the present application;

[0057] Figure 9 is a cross-sectional schematic view of a partial structure of a battery device in some other embodiments of the present application;

[0058] Figure 10 An axonometric view of a partial structure of a battery device according to some embodiments of the present application.

[0059] The reference numerals in the specific embodiments are as follows:

[0060] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - box body main body; 111 - first box body; 112 - second box body; 12 - battery cell; 121 - outer shell; 1211 - end cover; 1212 - housing; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter plate; 13 - expansion beam; 131 - first sheet metal part; 1311 - first main part; 1312 - first flanging part; 1313 - fourth flanging part; 13131 - first part; 13132 - second part; 1314 - first through hole; 132 - second sheet metal part; 1321 - first groove; 1322 - second groove; 1323 - second main part; 1324 - second flanging part; 13241 - first notch; 1325 - second through hole; 133 - third sheet metal part; 1331 - third main part; 1332 - third flanging part; 1333 - seventh flanging part; 134 - fourth sheet metal part; 1344 - fourth notch; 1341 - fourth main part; 1342 - fifth flanging part; 13421 - second notch; 1343 - sixth flanging part; 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 pole base; 19 - pressing strip; 20 - first cavity; 21 - first fastener; 22 - second fastener; 23 - third fastener; 24 - heat exchange tube; 25 - liquid inlet nozzle; 26 - liquid outlet nozzle; X - first direction; Y - second direction; Z - third direction. Specific Embodiments

[0061] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0064] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] The shape of the battery cell may include but is not limited to a cylinder, a flat body, a rectangular parallelepiped or other shapes, etc. The battery cell may include but is not limited to a cylindrical battery cell, a square battery cell, a soft pack battery cell and a blade battery cell according to the packaging method.

[0067] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0069] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0070] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0071] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0072] As an example, the box can include a first box and a second box. The first box and the second box are snapped together so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box can be a top cover or a bottom plate.

[0073] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0074] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0075] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, and a door is provided on at least one side of the box. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0076] In the following, the description will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, pouch battery cells, or blade battery cells in some aspects.

[0077] In a typical battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a casing, and the end cap closes the opening of the casing to define an accommodation space for accommodating the electrode assembly.

[0078] The electrode assembly is accommodated in an accommodation space. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the coated positive electrode active material layer protrudes from the positive electrode current collector with the coated positive electrode active material layer. The positive electrode current collector without the coated positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery device as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the coated negative electrode active material layer protrudes from the negative electrode current collector with the coated negative electrode active material layer. The negative electrode current collector without the coated negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order not to be fused when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. In addition, the forming method of the electrode assembly can include, but is not limited to, winding type, stacking type, etc.

[0079] Generally, the tabs lead out the electrical energy of the electrode assembly by being electrically connected to the conductive member. In some cases, the conductive member is a transfer piece connecting the tab and the electrode terminal. In some other cases, the conductive member is the electrode terminal.

[0080] The electrode terminal generally includes a positive electrode terminal and a negative electrode terminal. For a cuboid battery cell, the electrode terminal is generally arranged on the end cover part. In some other cases, the electrode terminal can also be arranged on the housing part. Multiple battery cells are connected in series and / or in parallel via the electrode terminals for various application scenarios.

[0081] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as reliability, energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the product cost of the battery device also needs to be considered.

[0082] An expansion beam is usually arranged in the box of a general battery device. On the one hand, it can limit the battery cell, and on the other hand, it can resist the expansion force of the battery cell, so that the overall battery device has high structural stability. Since a specific expansion beam can only adapt to battery cells with a certain expansion force, different expansion beams need to be selected when the expansion forces of the battery cells are different. And usually, the expansion beam is connected to the box by welding. When different expansion beams need to be selected, the entire box needs to be redesigned and the assembly process of the expansion beam needs to be redesigned, resulting in a high product cost of the battery device.

[0083] In view of this, the present application provides a battery device, which includes a box body, battery cells, and an expansion beam. The battery cells are housed in the box body, and the expansion beam is disposed in the box body. Among them, the expansion beam is detachably connected to the box body through a first fastener. By disassembling and assembling the first fastener, the expansion beam adapted to the battery cells can be replaced without re-designing the box body, which is beneficial to reducing the design and manufacturing costs of the battery device. When the expansion beam needs to be maintained, only the expansion beam needs to be replaced without replacing the entire box body, which is beneficial to reducing the maintenance cost of the battery device and thus beneficial to reducing the product cost of the battery device.

[0084] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0085] The electrical devices include but are not limited to: battery cars, electric vehicles, ships, spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0086] For the convenience of description, the following embodiments will take a vehicle 1000 of an embodiment of the present application as an example for description.

[0087] For example, Figure 1 FIG. 14 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A motor 300, a controller 200, and a battery device 100 can be disposed inside the vehicle 1000. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be disposed at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and used for the circuit system of the vehicle 1000, such as the working power requirements for starting, navigating, and running the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0088] To meet different power usage requirements, the battery device 100 may include a plurality of battery cells 12, where the plurality of battery cells 12 may be connected in series, parallel, or in a combination of series and parallel (mixed connection). A mixed connection refers to a combination of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, the plurality of battery cells 12 may first be connected in series, parallel, or in a mixed connection to form battery modules, and then the plurality of battery modules may be connected in series, parallel, or in a mixed connection to form the battery device 100. That is to say, the plurality of battery cells 12 may directly form the battery device 100, or may first form battery modules, and then the battery modules form the battery device 100.

[0089] For example, please refer to Figure 2 , Figure 2 which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may further include a box body main body 11, the interior of the box body main body 11 is a hollow structure, and the plurality of battery cells 12 are accommodated in the box body main body 11. As Figure 2 shown, here they are respectively referred to as the first box body 111 and the second box body 112, and the first box body 111 and the second box body 112 are buckled together. The shapes of the first box body 111 and the second box body 112 may be determined according to the shape of the combination of the plurality of battery cells 12, and the first box body 111 and the second box body 112 may each have an open surface. For example, both the first box body 111 and the second box body 112 may be hollow rectangular parallelepipeds and each has only one open surface, the open surfaces of the first box body 111 and the second box body 112 are oppositely arranged, and the first box body 111 and the second box body 112 are buckled together to form the box body main body 11 with a closed chamber. The plurality of battery cells 12 are connected in parallel, series, or in a mixed connection and then placed in the box body main body 11 formed by buckling the first box body 111 and the second box body 112.

[0090] Optionally, the battery device 100 may further include other structures, which will not be elaborated one by one here. For example, the battery device 100 may further include a busbar component, and the busbar component is used to realize the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component may realize the electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component may be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 may be further led out through a conductive mechanism passing through the box body 14.

[0091] According to different power demands, the number of battery cells 12 can be set to any value. Multiple battery cells 12 can be connected in series, parallel, or a combination of both to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 may be relatively large, for ease of installation, the battery cells 12 can be grouped and set, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery device 100 can include multiple battery modules, and these battery modules can be connected in series, parallel, or a combination of both.

[0092] Please refer to Figure 3 as shown in Figure 3 which is an exploded view of the battery cell 12 according to some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 can include a housing body 1212, and a cavity is formed by multiple wall portions of the housing body 1212, which is the multiple wall portions of the housing 121, and this cavity can be used to accommodate the electrode assembly 122. The housing body 1212 is determined according to the combined shape of one or more electrode assemblies 122. For example, the housing body 1212 can be a hollow cuboid, cube, or regular polyhedron, and one of the faces of the housing body 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the housing body 1212. The housing body 1212 is filled with an electrolyte, such as an electrolyte solution.

[0093] The battery cell 12 can also include two electrode terminals 123, and the two electrode terminals 123 can be provided on the end cap 1211. The end cap 1211 is usually in a flat plate shape, and the two electrode terminals 123 are fixed on the flat plate surface of the end cap 1211. The two electrode terminals 123 are a positive electrode terminal and a negative electrode terminal respectively. Each electrode terminal 123 is correspondingly provided with a jumper 124, which is located between the end cap 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, according to actual usage requirements, the electrode assembly 122 can be set to be single or multiple, and multiple independent electrode assemblies 122 are provided inside the battery cell 12.

[0094] According to some embodiments of the present application, please refer to Figures 4 - 5 , the present application provides a battery device 100, which includes a box body 14, a battery cell 12, and an expansion beam 13. The battery cell 12 is received in the box body 14, and the expansion beam 13 is provided in the box body 14. Among them, the expansion beam 13 is detachably connected to the box body 14 through a first fastener 21.

[0095] In some embodiments, the box body 14 is formed by stamping a recess on a plate body, and the recess forms a receiving space, and both the battery cell 12 and the expansion beam 13 are received in the above-mentioned receiving space.

[0096] The material of the box body 14 can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0097] The material of the expansion beam 13 can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0098] In some embodiments, please refer to Figure 4 , the number of the 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.

[0099] In some embodiments, the battery cell 12 includes an electrode assembly 122 and a housing 121, the electrode assembly 122 is received 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, and 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 a large deformation amplitude on the large surface of the battery cell 12.

[0100] In some embodiments, the following third direction Z is parallel to the thickness direction of the bottom wall 141.

[0101] In some embodiments, the expansion beam 13 is formed by an extrusion process.

[0102] In some embodiments, the expansion beam 13 is formed by welding multiple sheet metals.

[0103] The battery cell 12 can be connected to the inside of the box body 14 by means of bonding or fastener connection, etc. In some embodiments, the battery device 100 further includes other components, such as a heat exchange tube 24, and the battery cell 12 can also be fixed on the surface of the heat exchange tube 24.

[0104] 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 the expansion force.

[0105] The first fastener 21 can be a blind rivet nut and a screw, a bolt and a nut, a screw and a nut, a rivet, etc. In some embodiments, the first fastener 21 includes a bolt and a nut, and one of the above two can be preset on the expansion beam 13 or the box body 14, and during assembly, the two are then matched with each other.

[0106] The expansion beam 13 is detachably connected to the box body 14 through the first fastener 21, which means that removing the first fastener 21 can separate the expansion beam 13 from the box body 14.

[0107] Part of the first fastener 21 can be arranged inside the expansion beam 13, or all of the first fastener 21 can be located outside the expansion beam 13.

[0108] In some embodiments, the box body 14 includes a bottom wall 141 and side walls 142 surrounding the bottom wall 141, and the expansion beam 13 can be detachably connected to the bottom wall 141. In some other embodiments, the expansion beam 13 can be detachably connected to the side walls 142. In some other embodiments, the expansion beam 13 can be detachably connected to both the side walls 142 and the bottom wall 141. In still some other embodiments, the box body 14 may further include a box cover, the side walls 142 surround the bottom wall 141 and form an opening surface, and the box cover covers the opening surface so that the box body 14 includes a sealed accommodation cavity for accommodating the battery cells 12.

[0109] In some embodiments, the battery cells 12 abut against the expansion beam 13 when the battery cells 12 start to expand. In some other embodiments, the battery cells 12 abut against the expansion beam 13 after expanding by a certain amount. After the battery cells 12 abut against the expansion beam 13, the expansion beam 13 can provide a certain supporting force to the battery cells 12 to resist the expansion force of the battery cells 12. During the assembly process of the box body 14 of the battery device 100, the size of the gap between the battery cells 12 and the expansion beam 13 or whether the battery cells 12 and the expansion beam 13 abut against each other after assembly can be determined according to actual requirements.

[0110] In some embodiments, please refer to Figure 5 and Figure 7 , a third notch 1318 may further be provided on the expansion beam 13, and the battery device 100 further includes an output pole base 18, and the output pole base 18 is disposed in 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, a positive output pole base 18 is disposed in the third notch 1318 of one expansion beam 13, and a negative output pole base 18 is disposed in the third notch 1318 of the other expansion beam 13.

[0111] In the technical solution of the embodiment of the present application, the expansion beam 13 adapted to the battery cells 12 can be replaced by disassembling and assembling the first fastener 21, without the need to re - design the box body 14, which is beneficial to reducing the design and manufacturing cost of the battery device 100. When the expansion beam 13 needs to be maintained, only the expansion beam 13 needs to be replaced, without the need to replace the box body 14 as a whole, which is beneficial to reducing the maintenance cost of the battery device 100, and thus beneficial to reducing the product cost of the battery device 100.

[0112] According to some embodiments of the present application, please refer to Figures 4 - 6 and Figure 9 , the box body 14 includes a bottom wall 141 and a first bracket 15, the first bracket 15 is connected to the bottom wall 141, and the expansion beam 13 is detachably connected to the first bracket 15 through the first fastener 21.

[0113] The material of the first bracket 15 can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0114] The cross-sectional shape of the first bracket 15 can be U-shaped, inverted U-shaped, square-shaped, Z-shaped, etc.

[0115] The first bracket 15 and the bottom wall 141 can be connected by bonding, fasteners, welding or other means.

[0116] In some embodiments, the first bracket 15 is detachably connected to the bottom wall 141 by fasteners.

[0117] In some embodiments, please refer to Figure 9 , the first bracket 15 is a beam extending along the second direction Y. The first bracket 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 bracket further includes a fourth wall and a fifth wall. The fourth wall extends from one end of the first wall away from the second wall in a direction away from the third wall, and the fifth wall extends from one end of the third wall away from the second wall in a direction away from the first wall. The fourth wall and the fifth wall are both connected to the bottom wall 141.

[0118] In some embodiments, please refer to Figure 9 , in the first direction X, a part of the expansion beam 13 is located on the side of the first bracket 15 facing the battery cell 12. This setting enables most areas of the battery cell 12 to receive the abutting action of the expansion beam 13 when the battery cell 12 expands.

[0119] In some embodiments, the expansion beam 13 is disposed on the surface of the first bracket 15 that is farthest from the bottom wall 141 in the thickness direction of the bottom wall 141. This setting provides a relatively large assembly space between the expansion beam 13 and the first bracket 15, which is beneficial to reducing the assembly difficulty of the expansion beam 13 and the first bracket 15.

[0120] In some embodiments, the expansion beam 13 is directly connected to the wall of the box body 14 by the first fastener 21. The sealing requirement at the position of the box body 14 where the first fastener 21 is provided is relatively high. However, when the expansion beam 13 is disposed on the first bracket 15 by the first fastener 21, the sealing requirement of the box body 14 itself basically does not need to be considered when arranging the first fastener 21. For example, the first bracket 15 can be directly connected to the box body 14 by welding or bonding.

[0121] The setting of the first bracket 15 limits the boundary of the battery cell 12 during assembly to a certain extent.

[0122] In some embodiments, nuts may be preset on the first bracket 15. When assembling the expansion beam 13, the assembly of screws or bolts that cooperate with the nuts can be completed to finish the assembly of the expansion beam 13.

[0123] In the technical solution of the embodiment of the present application, the setting of 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 box body 14, resulting in an increased sealing difficulty of the box body 14. At the same time, the first bracket 15 can serve as an assembly base for the expansion beam 13, facilitating the pre-positioning of the expansion beam 13 and also facilitating the positioning of the battery cell 12.

[0124] According to some embodiments of the present application, please refer to Figures 4 - 6 , the box body 14 further includes a side wall 142, and the side wall 142 surrounds the bottom wall 141. The box body 14 further includes a second bracket 16, the second bracket 16 is connected to the side wall 142, and the second bracket 16 is detachably connected to the expansion beam 13 through a second fastener 22.

[0125] The material of the second bracket 16 can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0126] In some embodiments, the second bracket 16 is detachably connected to the side wall 142. With such a setting, when assembling or disassembling the expansion beam 13, the second bracket 16 can be separated from the box body 14, providing a larger assembly space for the separation of the expansion beam 13 and the second bracket 16.

[0127] In some embodiments, the second bracket 16 can be fixed to the side wall 142 by welding or bonding.

[0128] The cross-sectional shape of the second bracket 16 can be U-shaped, L-shaped, Z-shaped, etc.

[0129] Part of the second fastener 22 can be arranged inside the expansion beam 13, and the second fastener 22 can also be completely located outside the expansion beam 13.

[0130] The second fastener 22 can be a rivet nut and a screw, a bolt and a nut, a screw and a nut, a rivet, etc. In some embodiments, the second fastener 22 includes a bolt and a nut, and one of the two can be preset on the expansion beam 13 or the second bracket 16 in advance, and the two are then matched with each other during assembly.

[0131] The second bracket 16 can be a solid structure or a hollow structure.

[0132] In the above solution, the setting of the second bracket 16 can improve the connection strength between the expansion beam 13 and the box body 14. At the same time, the second bracket 16 is detachably connected to the expansion beam 13, enabling the battery device 100 to take into account lower design, manufacturing, and maintenance costs.

[0133] According to some embodiments of the present application, please refer to Figures 4 - 6 , the second bracket 16 is connected to the side of the expansion beam 13 facing away from the battery cell 12.

[0134] 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 facing away from the battery cell 12, and the second bracket 16 is connected to the side of the expansion beam 13 facing away from the battery cell 12, it means that the second bracket 16 can provide a certain resisting force when the battery cell 12 expands.

[0135] In the above solution, it is beneficial to improve the ability of the expansion beam 13 to resist the expansion force of the battery cell 12.

[0136] According to some embodiments of the present application, please refer to Figures 4 - 6 , the second bracket 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, the third connecting portion 163 is connected to the side wall 142, and the second connecting portion 162, the side wall 142 and the expansion beam 13 enclose a first cavity 20.

[0137] Please refer to Figure 6 , Figure 6 In [reference], the second connecting portion 162 is inclined, so that a triangular cavity is formed between the second connecting portion 162, the side wall 142 and the expansion beam 13, which is beneficial to improving the supporting force of the second bracket 16 on the expansion beam 13. That is, it is beneficial to the dispersion of stress and reduces the risk of stress concentration.

[0138] In the above solution, when the battery cell 12 expands, since the second connecting portion 162, the side wall 142 and the expansion beam 13 enclose a first cavity 20, the stress of the expansion beam 13 can be better released, thereby improving the ability of the expansion beam 13 to resist the expansion force and being beneficial to improving the structural stability of the expansion beam 13.

[0139] According to some embodiments of the present application, please refer to Figure 4 and Figure 9 , the box body 14 further includes a third bracket 17. The third bracket 17 is connected to the side wall 142, and the third bracket 17 is connected to the side of the expansion beam 13 facing the battery cell 12 through a third fastener 23.

[0140] The material of the third bracket 17 can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0141] In some embodiments, the third bracket 17 is detachably connected to the side wall 142. Such a setting allows the third bracket 17 to be separated from the box body 14 when assembling or disassembling the expansion beam 13, providing a larger assembly space for the separation of the expansion beam 13 and the third bracket 17.

[0142] In some embodiments, the third bracket 17 can be fixed to the side wall 142 by welding or bonding.

[0143] The cross-section of the third bracket 17 may be in an L-shape or the like.

[0144] Part of the third fastener 23 may be disposed inside the expansion beam 13 , or the third fastener 23 may be completely located outside the expansion beam 13 .

[0145] The third fastener 23 can be a rivet nut and a screw, a bolt and a nut, a screw and a 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 can be matched with each other during assembly.

[0146] The third bracket 17 can be a solid structure or a hollow structure.

[0147] In the above solution, the provision of the third bracket 17 not only further improves the structural stability of the expansion beam 13 , but also enables the battery device 100 to have lower design, manufacturing and maintenance costs.

[0148] According to some embodiments of this application, please refer to Figure 4 and Figure 9 The third bracket 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.

[0149] Please refer to Figure 9 The fifth connection portion 172 and the fourth connection portion 171 are perpendicular to each other, which means that in the first direction X and the second direction Y, the third bracket 17 occupies less space and the risk of interference between the battery cell 12 and the second bracket 16 is smaller.

[0150] 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 reduced energy density of the battery device 100 due to interference between the battery cell 12 and the third bracket 17.

[0151] According to some embodiments of this application, please refer toFigures 4 - 9 The expansion beam 13 is formed by welding a plurality of sheet metal parts.

[0152] In some embodiments, the sheet metal member is made of steel.

[0153] The expansion beam 13 can be formed by welding two, three, four, five, six or other sheet metals.

[0154] The expansion beam 13 formed by welding may have no space inside or may have a cavity inside. For example, referring to FIG7 , the expansion beam 13 has six cavities inside.

[0155] The welds can be either butt welds or fillet welds.

[0156] The welding position can be the end of two sheet metal parts, the end of one sheet metal part and the middle of the other sheet metal part, or the middle of both sheet metal parts.

[0157] In the above solution, the expansion beam 13 can be manufactured at a low cost by welding multiple sheet metal parts together. At the same time, the expansion beam 13 formed by welding multiple sheet metal parts can be assembled or disassembled as an independent component, with high assembly efficiency and relatively low assembly cost.

[0158] According to some embodiments of this application, please refer 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. 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.

[0159] In some embodiments, the second cavity is formed by punching a plurality of convex hulls on the surface of the second sheet metal 132. Two opposite outer surfaces of the convex hulls respectively abut against the first sheet metal 131 and the third sheet metal 133. The interior of the convex hulls forms the second cavity.

[0160] In some embodiments, the second cavity may be formed by a plurality of spaced grooves formed by bending the second sheet metal member 132 .

[0161] The second cavity can be used as a stress release area. Therefore, the expansion beam 13 has the second cavity, which is beneficial to the dispersion of stress.

[0162] In some embodiments, a plurality of first through-holes 1314 are provided on the surface of the first sheet metal part 131. 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 walls of the first through-holes 1314 can serve as welding references for welding the second sheet metal part 132 and the first sheet metal part 131. For example, by welding along the hole walls of the first through-holes 1314 to connect the first sheet metal part 131 and the second sheet metal part 132, such a setting results in relatively less welding deformation.

[0163] In some embodiments, a plurality of through second through-holes 1325 are provided in the second sheet metal part 132 along the thickness direction of the bottom wall 141. With such a setting, the expansion beam 13 can have a high ability to resist expansion force while having a relatively light weight, that is, it has a high mass energy density.

[0164] In the above solution, the second sheet metal part 132 enables a plurality of second cavities formed between the first sheet metal part 131 and the third sheet metal part 133 to serve as stress release regions, 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, enabling the battery device 100 to have both a high mass energy density.

[0165] According to some embodiments of the present application, please refer to Figures 4 - 9 , the side of the second sheet metal part 132 facing the first sheet metal part 131 has a first groove 1321, and the side of the second sheet metal part 132 facing the third sheet metal part 133 has a second groove 1322. 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.

[0166] In some embodiments, both the first groove 1321 and the second groove 1322 extend along the second direction Y and both extend to the edge of the second sheet metal part 132 in the second direction Y.

[0167] In some embodiments, since the trend of expansion force transmission is 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 supporting force to the first sheet metal part 131, reducing the risk of excessive deformation of the first sheet metal part 131.

[0168] On the premise that the total thickness of the expansion beam 13 is constant, the provision of the first groove 1321 and the second groove 1322 enables the expansion beam to have a high ability to resist expansion force while having a relatively low weight.

[0169] The shape, quantity, size, etc. of the first groove 1321 can be the same as or different from those of the second groove 1322.

[0170] In the above solution, the first groove 1321 and the second groove 1322 are formed by bending the second sheet metal part 132, with relatively low processing difficulty and cost. At the same time, the connection between the bottom wall of the second groove 1322 and the first sheet metal part 131 can improve the ability of the first sheet metal part 131 to resist the expansion force to a certain extent, thereby enhancing the ability of the expansion beam 13 to resist the expansion force.

[0171] According to some embodiments of the present application, please refer to Figures 4 - 9 , the first sheet metal part 131 includes a first main body part 1311 and a first flanging part 1312, and the first flanging part 1312 is connected to one end of the first main body part 1311 away from the bottom wall 141 in the thickness direction of the bottom wall 141. The third sheet metal part 133 includes a third main body part 1331 and a third flanging part 1332, and the third flanging part 1332 is connected to one end of the third main body part 1331 away from the bottom wall 141 in the thickness direction of the bottom wall 141. The first flanging part 1312 and the third flanging part 1332 are welded.

[0172] In some embodiments, the first flanging part 1312 and the third flanging part 1332 overlap, and welding is performed at the overlapping position to form the connection between the two through fillet welds.

[0173] The welding method can be laser welding, arc welding, etc.

[0174] In the above solution, the welding of the first flanging part 1312 and the third flanging part 1332 can reduce the risk of excessive deformation of the first main body part 1311 and the third main body part 1331 due to welding deformation, which is beneficial to improving the structural stability of the expansion beam 13.

[0175] According to some embodiments of the present application, please refer to Figures 4 - 9 , the first sheet metal part 131 further includes a fourth flanging part 1313, and the fourth flanging part 1313 is connected to one end of the first main body part 1311 close to the bottom wall 141 in the thickness direction of the bottom wall 141. The fourth flanging part 1313 is detachably connected to the first bracket 15 through the first fastener 21.

[0176] The detachable connection of the fourth flanging part 1313 to the first bracket 15 through the first fastener 21 means that in the embodiment of the expansion beam 13 formed by welding multiple sheet metal parts, the first fastener 21 can pass through one of the sheet metal parts to achieve the assembly with the first bracket 15. This is beneficial to reducing the risk that the first fastener 21 cannot smoothly pass through multiple sheet metal parts due to the position tolerance of the holes provided for the fasteners in different sheet metal parts, resulting in increased assembly difficulty.

[0177] The fourth flanging portion 1313 is located on the side of the expansion beam 13 away from the battery cell 12, which can provide a relatively large assembly space for the first sheet metal part 131, thereby reducing the assembly difficulty of the battery device 100.

[0178] In the above solution, by providing the fourth flanging portion 1313, a larger assembly space is created during the assembly of the first fastener 21, thereby reducing the assembly difficulty between the expansion beam 13 and the first bracket 15.

[0179] According to some embodiments of the present application, please refer to Figures 4 - 9 , the second sheet metal part 132 includes a second main body portion 1323 and a second flanging portion 1324. The second flanging portion 1324 is connected to one end of the second main body portion 1323 close to the bottom wall 141 in the thickness direction of the bottom wall 141. The expansion beam 13 further includes a fourth sheet metal part 134. The second flanging portion 1324 is located between the first flanging portion 1312 and the fourth sheet metal part 134, and the first flanging portion 1312, the second flanging portion 1324, and the fourth sheet metal part 134 are welded.

[0180] In some embodiments, please refer to Figures 7 - 10 , in some embodiments, at least a part of the first flanging portion 1312, the second flanging portion 1324, and the fourth sheet metal part 134 overlap, and the overlapping area can be used as the welding area.

[0181] The welding method can be laser welding or arc welding, etc.

[0182] In the above solution, by welding once, a connection can be formed among the first sheet metal part 131, the second sheet metal part 132, and the fourth sheet metal part 134, and the assembly efficiency is higher.

[0183] According to some embodiments of the present application, please refer to Figures 4 - 9 , the second flanging portion 1324 is provided with a first notch 13241, the fourth sheet metal part 134 is provided with a second notch 13421, the positions of the first notch 13241 and the second notch 13421 correspond, the first flanging portion 1312 includes a first part 13131 and a second part 13132. The first part 13131 is welded to the second flanging portion 1324 and the fourth sheet metal part 134, and the second part 13132 is exposed by the first notch 13241 and the second notch 13421 and is connected to the first bracket 15.

[0184] Both the first notch 13241 and the second notch 13421 can avoid the first fastener 21, so that the first fastener 21 can pass through one sheet metal part and be connected to the first bracket 15.

[0185] In some embodiments, the surface of the second part 13132 facing the bottom wall 141, the surface of the fifth flanging part 1342 facing away from the bottom wall 141, and the surface of the first bracket 15 farthest from the bottom wall 141 are coplanar. Such a setting makes the fit between the expansion beam 13 and the first bracket 15 closer, and while the expansion beam 13 has high structural strength, the assembly difficulty of the battery device 100 is relatively lower.

[0186] In the above solution, due to the settings 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 bracket 15 is also relatively high.

[0187] According to some embodiments of the present application, please refer to Figures 4 - 9 , the second part 13132 protrudes from the first part 13131 in the direction close to the bottom wall 141.

[0188] The second part 13132 protruding from the first part 13131 in the direction close to the bottom wall 141 means that a concave portion corresponding to the position of the convex portion will be formed on the surface of the second part 13132 on the side facing away from the bottom wall 141, and the concave portion can accommodate part of the first fastener 21, which is beneficial to improving the energy density of the battery device 100.

[0189] In the above solution, since the second part 13132 protrudes from the first part 13131 in the direction close to the bottom wall 141, to a certain extent, the assembly between the expansion beam 13 and the first bracket 15 can be completed without changing the shape of the connection surface of the first bracket 15, and the processing cost is relatively low.

[0190] According to some embodiments of the present application, please refer to [[ID=I8]] Figures 4 - 9 , the fourth sheet metal part 134 includes a fourth main body part 1341 and a fifth flanging part 1342. The fifth flanging part 1342 is connected to one end of the fourth main body part 1341 far from the bottom wall 141 in the thickness direction of the bottom wall 141, and the second notch 13421 is provided on the fifth flanging part 1342. At least part of the fourth main body part 1341 is located on the side of the first bracket 15 facing the battery cell 12.

[0191] Please refer 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 bracket 15 after expanding for a certain time. Since at least part of the fourth main body part 1341 is located on the side of the first bracket 15 facing the battery cell 12, the expansion force at each position of the large surface of the battery cell 12 can be better resisted.

[0192] In the above solution, at least part of the fourth main body 1341 is located on the side of the first bracket 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 .

[0193] According to some embodiments of this application, please refer to Figures 4 - 9 The fourth sheet metal component 134 further includes a sixth flange portion 1343, which is connected to an end of the fourth main body portion 1341 that is closer to the bottom wall 141 in the thickness direction of the bottom wall 141. The third sheet metal component 133 further includes a seventh flange portion 1333, which is connected to an end of the third main body portion 1331 that is closer to the bottom wall 141 in the thickness direction of the bottom wall 141. The sixth flange portion 1343 is connected to the seventh flange portion 1333.

[0194] The sixth flange portion 1343 and the seventh flange portion 1333 may be connected by welding or fasteners.

[0195] In some embodiments, the sixth flange portion 1343 and the seventh flange portion 1333 are overlapped, and welding is performed at the overlapped position to form a connection between the two by a fillet weld. The welding method can be laser welding, arc welding, etc.

[0196] In the above solution, the connection between the sixth flange portion 1343 and the seventh flange portion 1333 can reduce the risk of excessive deformation of the third main portion 1331 and the fourth main portion 1341 due to assembly stress, thereby facilitating improvement of the structural stability of the expansion beam 13 .

[0197] According to some embodiments of this application, please refer to Figures 4 - 9 A plurality of battery cells 12 are provided, and the battery cells 12 are 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 brackets 15 are provided, and the first brackets 15 are provided in a one-to-one correspondence 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 cells 12 are located between the two expansion beams 13.

[0198] In the first direction X, the battery cell 12 is located between the 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.

[0199] In the above solution, 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 body 14 and sealing failure due to the expansion and deformation of the battery cell 12.

[0200] According to some embodiments of the present application, please refer to Figures 4 - 9 , the battery device 100 further includes a pressing strip 19, the pressing strip 19 extends along the first direction X, both ends of the pressing strip 19 are respectively connected to two expansion beams 13, and the pressing strip 19 is press-connected to the side of the battery cell 12 facing away from the bottom wall 141.

[0201] The material of the pressing strip can be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0202] In some embodiments, the pressing strip can connect the battery cell 12 and the expansion beam 13 through a colloid.

[0203] In some other embodiments, holes matching the fasteners can be reserved on the expansion beam 13. The fasteners can be blind rivet nuts and screws, bolts and nuts, screws and nuts, rivets, etc. The pressing strip can be connected to the expansion beam 13 through the fasteners.

[0204] In the above solution, the setting of the pressing strip 19 can press the battery cell 12 tightly, reducing the risk of the battery cell 12 shaking, and making the battery device 100 have high structural stability.

[0205] According to some embodiments of the present application, please refer to Figures 4 - 10 , the two expansion beams 13 are respectively a first expansion beam and a second expansion beam. The battery device 100 includes a heat exchange tube 24, a liquid inlet nozzle 25 and a liquid outlet nozzle 26. The heat exchange tube 24 is arranged on the bottom wall 141, the heat exchange tube 24 passes through a first bracket 15 corresponding to the first expansion beam, and the liquid inlet nozzle 25 and the liquid outlet nozzle 26 are located on the side of the first expansion beam facing away from the battery cell 12, and both the liquid inlet nozzle 25 and the liquid outlet nozzle 26 are connected to the heat exchange tube 24.

[0206] A heat exchange medium is arranged in the heat exchange tube 24, and the heat exchange medium is used to adjust the temperature of the battery cell 12. The heat exchange medium can be water, gas, etc.

[0207] In some embodiments, a heat 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 heat conductive adhesive.

[0208] In some embodiments, please refer to Figure 10 , the box body 14 is a box body formed by stamping. During the stamping process of the box body 14, a plurality of convex parts can be formed on the bottom wall 141 together through the design of the mold. The setting of the convex parts can define the assembly position of the heat exchange tube 24. At the same time, the convex parts can fill the gaps formed after the heat exchange tube 24 is bent, and the amount of the heat conductive adhesive can be reduced, thereby saving costs. In some other embodiments, the surface of the convex part 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 after the battery cell 12 is assembled.

[0209] The heat exchange tube 24 can be a round tube or a flat tube.

[0210] Please refer to Figure 4 and Figure 5 , Figure 4 Among them, 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.

[0211] In some embodiments, the first expansion beam and the second expansion beam divide the accommodation space in the box body 14 into an electrical compartment and an installation compartment spaced along the first direction X. The side wall 142 includes a first side wall and a second side wall oppositely arranged along the first direction X, and a third side wall and a fourth side wall oppositely arranged along the second direction Y. The first side wall, the third side wall, the fourth side wall and the first expansion beam jointly define the above-mentioned electrical compartment, and components such as a battery device management system and a high-voltage box are arranged in the electrical compartment. The liquid inlet nozzle 25 and the liquid outlet nozzle 26 are located in the electrical compartment. The third side wall, the fourth side wall, the first expansion beam and the second expansion beam jointly define the installation compartment, and the battery cells 12 are arranged in the installation compartment.

[0212] In the above solution, the liquid inlet nozzle 25 and the liquid outlet nozzle 26 are arranged on the side of the first expansion beam away from the battery cells 12, which will not occupy the space between the first expansion beam and the second expansion beam, so that most of the battery cells 12 between the first expansion beam and the second expansion beam can be provided with a supporting force by the first expansion beam and the second expansion beam, which is beneficial to improving the reliability of the battery device 100.

[0213] According to some embodiments of the present application, the present application provides an electrical device, including the battery device 100 in one or more of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0214] In the above solution, since the battery device 100 in one or more of the above embodiments has a low product cost, the electrical device including the battery device 100 in one or more of the above embodiments also has a low cost.

[0215] According to some embodiments of the present application, referring to Figures 4 - 10 , the present application provides a battery device 100. The battery device 100 includes a box body 14, battery cells 12, an expansion beam 13 and a heat exchange tube 24. The battery cells 12 are housed in the box body 14, and the expansion beam 13 is arranged in the box body 14.

[0216] The box body 14 includes a bottom wall 141, side walls 142, a first bracket 15, a second bracket 16, and a third bracket 17. The side walls 142 surround the bottom wall 141. The first bracket 15 is connected to the bottom wall 141, and the expansion beam 13 is detachably connected to the first bracket 15 through a first fastener 21. The box body 14 further includes a second bracket 16. The second bracket 16 is connected to the side wall 142, and the second bracket 16 is detachably connected to the expansion beam 13 through 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 the third bracket 17 is connected to the expansion beam 13 on the side facing the battery cell 12 through a third fastener 23.

[0217] The second bracket 16 includes a first connecting portion 161, a second connecting portion 162, and a third connecting portion 163 that are 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. 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 a first cavity 20. The third bracket 17 includes a fourth connecting portion 171 and a fifth connecting portion 172 that are connected in sequence. The fourth connecting portion 171 is connected to the side of the expansion beam 13 facing the battery cell 12. The fifth connecting portion 172 is connected to the side wall 142, and the fifth connecting portion 172 and the fourth connecting portion 171 are perpendicular to each other.

[0218] 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 facing away from the battery cell 12. At least a portion of the second sheet metal part 132 is located between the first and third sheet metal parts 131, 133. The second sheet metal part 132 divides the space between the first and third sheet metal parts 131, 133 into a plurality of second cavities. The second sheet metal member 132 has a first groove 1321 on its side facing the first sheet metal member 131, and a second groove 1322 on its side facing the third sheet metal member 133. The first grooves 1321 and the second grooves 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 member 133, while the bottom wall of the second groove 1322 is connected to the first sheet metal member 131. The first sheet metal member 131 includes a first main portion 1311 and a first flange portion 1312. The first flange portion 1312 is connected to the end of the first main portion 1311 that is away from the bottom wall 141 in the thickness direction of the bottom wall 141. The third sheet metal member 133 includes a third main portion 1331 and a third flange portion 1332. The third flange portion 1332 is connected to the end of the third main portion 1331 that is away from the bottom wall 141 in the thickness direction of the bottom wall 141. The first flange portion 1312 and the third flange portion 1332 are welded. The first sheet metal component 131 also includes a fourth flange portion 1313, which is connected to an end of the first main body portion 1311 that is close to the bottom wall 141 in the thickness direction of the bottom wall 141. The fourth flange portion 1313 is detachably connected to the first bracket 15 via a first fastener 21. The second sheet metal component 132 includes a second main body portion 1323 and a second flange portion 1324, which is connected to an end of the second main body portion 1323 that is close to the bottom wall 141 in the thickness direction of the bottom wall 141. The expansion beam 13 also includes a fourth sheet metal component 134, the second flange portion 1324 is located between the first flange portion 1312 and the fourth sheet metal component 134, and the first flange portion 1312, the second flange portion 1324, and the fourth sheet metal component 134 are welded. The second flange portion 1324 is provided with a first notch 13241, and the fourth sheet metal component 134 is provided with a second notch 13421. The first notch 13241 and the second notch 13421 correspond in position. The first flange portion 1312 includes a first portion 13131 and a second portion 13132. The first portion 13131 is welded to the second flange portion 1324 and the fourth sheet metal component 134. The second portion 13132 is exposed by the first notch 13241 and the second notch 13421 and is connected to the first bracket 15. The second portion 13132 protrudes from the first portion 13131 in a direction closer to the bottom wall 141.The fourth sheet metal part 134 includes a fourth main body part 1341 and a fifth flanging part 1342. The fifth flanging part 1342 is connected to one end of the fourth main body part 1341 away from the bottom wall 141 in the thickness direction of the bottom wall 141. A second notch 13421 is provided in the fifth flanging part 1342. At least part of the fourth main body part 1341 is located on the side of the first bracket 15 facing the battery cell 12. The fourth sheet metal part 134 further includes a sixth flanging part 1343. The sixth flanging part 1343 is connected to one end of the fourth main body part 1341 close to the bottom wall 141 in the thickness direction of the bottom wall 141. The third sheet metal part 133 further includes a seventh flanging part 1333. The seventh flanging part 1333 is connected to one end of the third main body part 1331 close to the bottom wall 141 in the thickness direction of the bottom wall 141. The sixth flanging part 1343 is connected to the seventh flanging part 1333.

[0219] The heat exchange tube 24 is arranged on the bottom wall 141. A fourth notch 1344 is provided on the expansion beam 13. The fourth notch 1344 can avoid part of the heat exchange tube 24 passing through the first bracket 15.

[0220] By disassembling and assembling the first fastener 21, the second fastener 22 and the third fastener 23, the expansion beam 13 adapted to the battery cell 12 can be replaced without re - designing the box body 14, which is beneficial to reducing the design and manufacturing costs of the battery device 100. When the expansion beam 13 needs to be maintained, only the expansion beam 13 needs to be replaced without replacing the whole box body 14, which is beneficial to reducing the maintenance cost of the battery device 100, and further beneficial to reducing the product cost of the battery device 100. The setting of the second bracket 16 can improve the connection strength between the expansion beam 13 and the box body 14 and the ability of the expansion beam 13 to resist the expansion force while making the battery device 100 take into account lower design, manufacturing and maintenance costs.

[0221] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body; A battery cell, accommodated in the box body; An expansion beam, arranged in the box body; Wherein, the expansion beam is detachably connected to the box body through a first fastener.

2. The battery device according to claim 1, wherein The box body includes a bottom wall and a first bracket, the first bracket is connected to the bottom wall, and the expansion beam is detachably connected to the first bracket through the first fastener.

3. The battery device according to claim 2, characterized in that, The box body further includes a side wall, and the side wall surrounds the periphery of the bottom wall; The box body further includes a second bracket, the second bracket is connected to the side wall, and the second bracket is detachably connected to the expansion beam through 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 facing away from the battery cell.

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

6. The battery device according to claim 3, characterized in that, The box body further includes a third bracket, the third bracket is connected to the side wall, and the third bracket is connected to the side of the expansion beam facing the battery cell through a third fastener.

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

8. The battery device according to claim 2, characterized in that, The expansion beam is formed by welding a plurality of 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, the third sheet metal part is located on the side of the expansion beam facing away from the battery cell, at least part 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 side of the second sheet metal part facing the first sheet metal part has a first groove, and the side of the second sheet metal part facing the third sheet metal part has a second groove. 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, characterized in that, The first sheet metal part includes a first main body part and a first flanging part, and the first flanging part is connected to one end of the first main body part away from the bottom wall in the thickness direction of the bottom wall; The third sheet metal part includes a third main body part and a third flanging part, and the third flanging part is connected to one end of the third main body part away from the bottom wall in the thickness direction of the bottom wall; The first flanging part and the third flanging part are welded.

12. The battery device according to claim 11, characterized in that, The first sheet metal part further includes a fourth flanging part, and the fourth flanging part is connected to one end of the first main body part close to the bottom wall in the thickness direction of the bottom wall; The fourth flanging part is detachably connected to the first bracket through the first fastener.

13. The battery device according to claim 11, wherein, The second sheet metal component includes a second main body portion and a second flange portion, wherein the second flange portion is connected to an end of the second main body portion close to the bottom wall in the thickness direction of the bottom wall; The expansion beam further includes a fourth sheet metal component. The second flanging portion is located between the first flanging portion and the fourth sheet metal component. The first flanging portion, the second flanging portion, and the fourth sheet metal component are welded.

14. The battery device according to claim 13, characterized in that, The second flange portion 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 correspond in position. The first flange portion includes a first part and a second part. The first part is welded to the second flange portion 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 bottom wall.

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

17. The battery device according to claim 16, characterized in that, The fourth sheet metal component further includes a sixth flange portion, the sixth flange portion being connected to an end of the fourth main body portion close to the bottom wall in the thickness direction of the bottom wall; The third sheet metal component further includes a seventh flange portion, the seventh flange portion being connected to an end of the third main body portion close to the bottom wall in the thickness direction of the bottom wall; The sixth flange portion is connected to the seventh flange portion.

18. The battery device according to claim 2, wherein, The battery cells are provided in plurality, and the plurality of battery cells are arranged in a plurality of rows, each row of the battery cells includes a plurality of battery cells arranged along a first direction, and the plurality of 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 brackets are provided. The first brackets are provided in 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, wherein, The battery device further includes a pressure strip extending along the first direction, with two ends of the pressure strip respectively connected to the two expansion beams, and the pressure strip is pressed against a side of the battery cell facing away from the bottom wall.

20. The battery device according to claim 18, wherein The two expansion beams are respectively a first expansion beam and a second expansion beam; The battery device includes a heat exchange tube, a liquid inlet nozzle and a liquid outlet nozzle. The heat exchange tube is arranged on the bottom wall. The heat exchange tube passes through the first bracket corresponding to the first expansion beam. The liquid inlet nozzle and the liquid outlet nozzle are located on the side of the first expansion beam away from the battery cell. The liquid inlet nozzle and the liquid outlet nozzle are both connected to the heat exchange tube.

21. An electrical device, characterized in that, The battery device comprises the battery device according to any one of claims 1 to 20, wherein the battery device is used to provide electrical energy.

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