Battery device, reinforcer and electric equipment

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device, a reinforcing piece and electric equipment. The battery device comprises a box body, a battery monomer assembly and a reinforcing piece, the box body is provided with an accommodating cavity, and the battery monomer assembly and the reinforcer are arranged in the accommodating cavity; the battery monomer assembly comprises a plurality of battery monomers distributed along a first direction, each battery monomer comprises a shell, the shell comprises a first wall perpendicular to the first direction and a second wall parallel to the first direction, and the area of the first wall is larger than that of the second wall; the reinforcer comprises an extruded sheet, a hollow channel is formed in the extruded sheet, and the extruded sheet is arranged at at least one end of the battery monomer assembly along the first direction. According to the technical scheme provided by the embodiment of the invention, the support and constraint on the battery monomer are enhanced, and the technical problem of relatively large deformation of a shell caused by the expansion of the battery monomer in the related technology is solved.

Description

Technical Field

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

[0002] During long-term battery operation, battery cells are susceptible to volume expansion due to factors such as charge and discharge cycles, ambient temperature fluctuations, and material aging. Without effective support and restraint structures, the battery cell casing will rapidly deform and bulge under internal pressure, and in severe cases, even rupture. Utility Model Content

[0003] In view of this, the embodiments of the present application provide a battery device, a reinforcement member and an electrical device, which are intended to enhance the support and restraint of the battery cell and solve the technical problem in the related art that the battery cell itself undergoes significant deformation due to the expansion of the battery cell.

[0004] An embodiment of the first aspect of the present application provides a battery device, comprising: a box body having a accommodating cavity; a battery cell assembly, arranged in the accommodating cavity, the battery cell assembly including a plurality of battery cells distributed along a first direction, the battery cell including a shell, the shell including a first wall perpendicular to the first direction and a second wall parallel to the first direction, the area of the first wall being greater than the area of the second wall; a reinforcement, arranged in the accommodating cavity, the reinforcement including an extruded plate, the interior of the extruded plate having a hollow channel, the extruded plate being arranged at at least one end of the battery cell assembly along the first direction.

[0005] In the above embodiment, in the expansion direction of the battery cell, at least one end of the battery cell assembly is against the extruded plate. Due to its high strength and rigidity, the extruded plate can provide reliable support and constraint for multiple battery cells. When the battery cell expands in volume, the reaction force provided by the extruded plate offsets the outward expansion force of the battery cell, which can effectively suppress the expansion of the battery cell, thereby reducing the deformation degree and rupture risk of the battery cell shell itself. At the same time, the expansion of the battery cell is suppressed, and the extrusion caused by it on the box is also reduced accordingly, thereby effectively reducing the deformation and rupture risk of the box caused by the expansion of the battery cell; in addition, the hollow channel design inside the extruded plate enables the extruded plate to deform to a certain extent when subjected to external force, thereby absorbing more energy, further reducing the impact of the expansion and deformation of the battery cell on the box. At the same time, this design can improve the thermal insulation performance of the extruded plate, and can effectively reduce the overall weight of the reinforcement and the battery device while ensuring the compressive strength of the reinforcement, thereby improving the performance of the battery device.

[0006] In some embodiments, the box body includes a box beam, the length direction of the box beam is perpendicular to the first direction, and the extruded plate is arranged between the battery cell assembly and the box beam.

[0007] In the above design, the reinforcement can physically isolate the battery cell and the relative box beam, playing a good buffering role between the two, thereby helping to further reduce the risk of box deformation and rupture caused by battery cell expansion. At the same time, the extruded board has good thermal insulation performance and can also inhibit heat transfer between the battery cell and the box, thereby improving the temperature distribution within the battery device and reducing the impact of temperature changes on the performance and life of the battery device.

[0008] In some embodiments, the box beam includes two side beams distributed along a first direction, a receiving cavity is formed between the two side beams, and reinforcements are provided between the two side beams and the battery cell assembly.

[0009] In the above design, the two reinforcements can jointly support and restrain the battery cell on different sides along the first direction, thereby suppressing the expansion of the battery cell on opposite sides of the battery cell at the same time. This is conducive to further reducing the degree of deformation of the battery cell shell itself and reducing the risk of deformation and rupture of the box.

[0010] In some embodiments, the box body includes a bottom plate and a surrounding plate arranged on the bottom plate. The bottom plate and the surrounding plate together form a storage space. One of the two side beams is used to constitute part of the surrounding plate, and the other is arranged in the storage space and is used to separate the storage cavity and the electrical cavity in the storage space.

[0011] In the above design, the side beams can divide the box into independent accommodating cavities to store battery cells separately, which improves the flexibility of the box structure design. In some cases, the safety of the battery device can be improved by storing electrical components and battery cells separately.

[0012] In some embodiments, the box beam includes a limiting beam located in the accommodating cavity, and the limiting beam is used to separate a plurality of sub-cavities for storing battery cell assemblies in the accommodating cavity; a reinforcement member is provided between the battery cell assembly and the limiting beam.

[0013] In the above design, the use of limiting beams and adjacent reinforcements to abut against the battery cells can further improve the support and restraint effect on the battery cells, thereby helping to further reduce the degree of deformation of the battery cell shell itself and reduce the risk of deformation and rupture of the box.

[0014] In some embodiments, the extruded plate is opposite the plurality of battery cell assemblies.

[0015] In the above design, the extruded plate can provide the same support and constraint for the battery cells in the multiple battery cell assemblies, thereby helping to keep the expansion of the battery cells in the multiple battery cell assemblies consistent.

[0016] In some embodiments, the battery device further includes a water cooling plate, which is disposed between the battery cells and the extruded plate.

[0017] In the above design, the water-cooling plate is directly attached to the first wall of the battery cell, which can achieve efficient heat conduction and thus have a good heat dissipation effect. At the same time, the water-cooling plate is integrated with the reinforcement to form an overall structure and jointly support the battery cell. This is conducive to improving the support and restraint effect on the battery cell, thereby further alleviating the harm caused by the expansion of the battery cell.

[0018] In some embodiments, at least a portion of the hollow channel extends in a direction parallel to the first wall.

[0019] In the above design, the hollow channel can be opposite to the battery cell, so that the extruded plate has higher reliability.

[0020] In some embodiments, the interior of the extruded board has a plurality of hollow channels, the plurality of hollow channels penetrate the extruded board along the length direction of the extruded board, and the plurality of hollow channels are arranged in parallel.

[0021] In the above design, the extruded plate can better disperse the pressure. This dispersion effect can prevent the extruded plate from being subjected to excessive local force, thereby improving the compression and deformation resistance of the reinforcement, so that the reinforcement can better support and restrain the battery cell.

[0022] In some embodiments, the hollow channels account for more than 10% of the volume of the extruded board.

[0023] In the above design, the larger proportion of hollow channels can provide a larger deformation space, thereby absorbing more energy and improving the buffering capacity of the reinforcement.

[0024] In some embodiments, the extruded sheet is a polycarbonate sheet.

[0025] In the above design, the polycarbonate plate has good impact resistance and can withstand large external forces without deformation or damage.

[0026] In some embodiments, the extruded sheet is a polypropylene sheet.

[0027] In the above design, the polypropylene plate is lighter in weight and is suitable for battery devices with strict product requirements.

[0028] In some embodiments, the reinforcement comprises a buffer pad, which is disposed on a side of the extruded board facing the first wall, and has elastic deformation capability.

[0029] In the above design, the buffer pad can physically isolate the battery cell from the extruded plate, and can undergo elastic deformation when squeezed, absorbing and dispersing part of the pressure. Therefore, the provision of the buffer pad can reduce the impact of the battery cell expansion on the extruded plate.

[0030] In some embodiments, the thickness of the cushion in the first direction is 0.5 mm to 3 mm.

[0031] In the above design, the thickness of the buffer pad is greater than 0.5 mm, which can ensure that the buffer pad has good buffering capacity. At the same time, the thickness of the buffer pad is less than 3 mm, which can avoid the buffer pad taking up too much space and help improve the energy density of the battery device.

[0032] In some embodiments, the surface of the reinforcement facing the first wall has an adhesive layer, and the adhesive layer has double-sided adhesiveness.

[0033] In the above design, the adhesive layer can connect the extruded board with structures such as battery cells or water-cooling plates, thereby fixing the position of the reinforcement and preventing the reinforcement from being displaced due to vibration, impact or other external forces, thereby ensuring that the reinforcement can play a reliable buffering and supporting role.

[0034] An embodiment of the second aspect of the present application provides a reinforcement member for use in the battery device of the first aspect. The reinforcement member includes an extruded plate and a buffer pad that are fitted together. The buffer pad has elastic deformation capability.

[0035] The reinforcement provided in the embodiment of the present application can be used in a battery device. When it is arranged close to the battery cell, it can play a good buffering and supporting role, thereby reducing the deformation degree of the battery cell shell itself, and reducing the risk of deformation and rupture of the box when the battery cell expands, thereby improving the reliability and safety of the battery device.

[0036] An embodiment of the third aspect of the present application provides an electrical device, including the battery device in each embodiment of the first aspect, and the battery device is used to store or provide electrical energy.

[0037] The electrical equipment provided in the embodiment of the present application improves the reliability and safety of the electrical equipment by adopting the battery device in the first aspect.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or conventional technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 is an exploded view of a battery device provided in an embodiment of the present application;

[0042] Figure 3 is an exploded view of a battery cell provided in an embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of a battery device provided in an embodiment of the present application;

[0044] Figure 5 yes Figure 4 a cross-sectional view of the battery device shown;

[0045] Figure 6 yes Figure 5 A magnified view of the structure shown in middle A;

[0046] Figure 7 yes Figure 5 A magnified view of the structure shown in B;

[0047] Figure 8 is a schematic structural diagram of a reinforcement member provided in an embodiment of the present application;

[0048] Figure 9 yes Figure 8 a front view of the reinforcement member shown;

[0049] Figure 10 is a cross-sectional view of a reinforcement member provided in some embodiments of the present application;

[0050] Figure 11 is a cross-sectional view of a reinforcement member provided in some other embodiments of the present application;

[0051] Figure 12 is a cross-sectional view of a reinforcement member provided in some other embodiments of the present application;

[0052] Figure 13 2 is a cross-sectional view of a reinforcement member provided in some other embodiments of the present application.

[0053] The meanings of the marks in the figure are:

[0054] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0055] 10. Box body; 11. First box body; 12. Second box body; 121. Accommodation cavity; 122. Box body beam; 1221. Side beam; 1222. Limit beam; 123. Electrical cavity; 12a. Bottom plate; 12b. Enclosure;

[0056] 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 221. First wall; 222. Second wall; 23. Electrode assembly; 23a. Tab;

[0057] 30. Reinforcement member; 31. Extruded board; 311. Hollow channel; 312. Contact wall; 313. Reinforcement rib; 32. Buffer pad; 33. Adhesive layer;

[0058] 40. Water cooling plate. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] 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.

[0062] 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.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] 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).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0067] During long-term battery operation, the volume of battery cells may expand due to various reasons. For example, during the cycling of battery cells, the positive and negative active materials undergo ion insertion and extraction, which causes the volume of the electrode materials to change, leading to battery cell expansion.

[0068] In related technologies, a battery assembly includes a housing and several battery cells housed within it. However, due to limitations in material and structural design, some housings are relatively weak, failing to provide reliable support and restraint for the battery cells. This makes the battery cell housings susceptible to internal pressure, causing deformation, bulging, and even rupture. Furthermore, the expansion of the battery cells generates significant expansion force, which, if continuously applied to the housing, can also cause deformation or rupture.

[0069] Based on the above considerations, in order to alleviate the problem of deformation of the battery cell shell and box caused by the expansion of the battery cell, the present application provides a battery device, including a box, a battery cell assembly disposed within the box, and a reinforcement. The battery cell assembly includes a plurality of battery cells, each of which includes a first wall having a large surface. The reinforcement includes an extruded plate having a hollow channel therein. The extruded plate is disposed at at least one end of the battery cell assembly and is opposite to the first wall of the battery cell. In this battery device, the reinforcement can abut against the battery cell in the direction of battery cell expansion, providing reliable support and restraint for the battery cell. The reaction force provided by the reinforcement offsets the outward expansion force of the battery cell, which can resist the expansion of the battery cell, thereby effectively reducing the degree of deformation and rupture risk of the battery cell shell. At the same time, the expansion of the battery cell is suppressed, and the extrusion caused by the battery cell on the box is correspondingly reduced, thereby effectively reducing the deformation and rupture risk of the box caused by the expansion of the battery cell.

[0070] The battery device provided in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The power-consuming device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0071] For the convenience of explanation, the embodiment of the present application is described by taking a vehicle 1000 as an example of an electrical device.

[0072] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0073] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0074] Please refer to Figure 2 , Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 may include a first housing 11 and a second housing 12, and the first housing 11 and the second housing 12 cover each other, and the first housing 11 and the second housing 12 jointly define a storage space for accommodating the battery cell 20. The second housing 12 may be a hollow structure with one end open, and the first housing 11 may be a plate-shaped structure, and the first housing 11 covers the open side of the second housing 12, so that the first housing 11 and the second housing 12 jointly define a storage space; the first housing 11 and the second housing 12 may also be hollow structures with one side open, and the open side of the first housing 11 covers the open side of the second housing 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0075] In some embodiments, the box 10 can serve as part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross member and longitudinal member of the vehicle 1000.

[0076] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell assembly may be housed within the housing 10. Alternatively, the multiple battery cells 20 may be first connected in series, in parallel, or in a hybrid connection to form a battery cell assembly, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery cell assembly, which is then housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0077] A battery cell 20 is the smallest unit that makes up the battery device 100. Each battery cell 20 may be a secondary battery, which is a battery cell 20 that can be recharged to activate its active material after discharge and continue to be used. The battery cell 20 may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, or a lead-acid battery. The battery cell 20 may be cylindrical, flat, rectangular, or have other shapes.

[0078] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0079] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 21 from deforming under compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0080] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0081] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0082] The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings. In the embodiments provided in the present application, the X direction represents the width of the battery cell 20, the Y direction represents the length of the battery cell 20, and the Z direction represents the height of the battery cell 20. The X, Y, and Z directions are perpendicular to each other.

[0083] Please refer to Figure 4-Figure 9 , Figure 4 This is a schematic structural diagram of a battery device 100 provided in some embodiments of the present application. Figure 5 for Figure 4 A cross-sectional view of the battery device 100 is shown, Figure 6 for Figure 5 A partial enlarged view of the structure shown in Figure 1. Figure 7 for Figure 5 A partial enlarged view of the structure shown in B. Figure 8 This is a schematic diagram of the structure of the reinforcement member 30 provided in some embodiments of the present application. Figure 9 for Figure 8 The embodiment of the first aspect of the present application provides a battery device 100, comprising a housing 10, a battery cell assembly, and a reinforcement 30. The housing 10 has a receiving cavity 121, and the battery cell assembly and the reinforcement 30 are both disposed within the receiving cavity 121 of the housing 10. The battery cell assembly includes a plurality of battery cells 20 distributed along a first direction X. The battery cell 20 includes a housing 22. The housing 22 includes a first wall 221 perpendicular to the first direction X and a second wall 222 parallel to the first direction X. The area of the first wall 221 is greater than the area of the second wall 222. It is understood that the first wall 221 can be referred to as the "large surface" of the battery cell 20. The reinforcement 30 includes an extruded plate 31 having a hollow channel 311 therein. The extruded plate 31 is disposed at at least one end of the battery cell assembly along the first direction X and opposite the first wall 221 of the battery cell 20.

[0084] The housing 10 is a structure within the battery device 100 that provides space and a secure base for the battery cells 20 or other structures. The housing 10 can have various shapes and sizes, such as a prismatic or cylindrical shape. The housing 10 can be made of metal, plastic, or other materials.

[0085] A battery cell assembly refers to a component in the battery device 100 that is used to provide voltage and capacity. The battery device 100 may include one or more battery cell assemblies. The multiple battery cell assemblies may be arranged in a single row or multiple rows within the accommodating cavity 121. When the multiple battery cell assemblies are arranged in a single row or multiple rows, they may be further arranged in two or more layers. The battery cell assembly may be a battery module. A battery module is composed of multiple battery cells arranged and fixed into an independent module. For example, a battery module may be formed by bundling multiple battery cells 20 by cable ties. The battery cell assembly may be accommodated in the case 10 by fixing the battery module in the case 10, or the battery cell assembly may be accommodated in the case 10 by directly fixing the multiple battery cells 20 in the case 10.

[0086] Please refer to Figure 2 The battery cell 20 refers to the smallest unit that makes up the battery device 100. The number of battery cells 20 can be two, three, or more. The multiple battery cells 20 are arranged at least along the first direction X. For example, the multiple battery cells 20 can be arranged in a row, linearly arranged in a single direction along the first direction X. Alternatively, the multiple battery cells 20 can be arranged in multiple rows, with the multiple battery cells 20 in each row linearly arranged in a single direction along the first direction X, and the multiple rows of battery cells 20 arranged along the second direction Y. For example, when the multiple battery cells 20 are arranged in one or more rows, they can be further arranged in two or more layers. The shape of the battery cells 20 can be, but is not limited to, a rectangular parallelepiped.

[0087] Please refer to Figure 2 and Figure 3The housing 22 is the structure within the battery cell 20 that encloses the electrode assembly 23, electrolyte, and other components. The housing 22 can be a hollow structure with one end open. The battery cell 20 also includes an end cap 21, which covers the open side of the housing 22. The end cap 21 is used to seal the housing 22 and together with the housing 22, form a sealed space. For example, the housing 22 may be in the shape of a rectangular parallelepiped and include two first walls 221, two second walls 222, and a bottom wall 223. The two first walls 221 and the two second walls 222 are disposed on one side of the bottom wall 223 and are sequentially connected around the circumference. The first walls 221 extend along the second direction Y and the third direction Z, the second walls 222 extend along the first direction X and the third direction Z, and the bottom wall 223 extends along the first direction X and the second direction Y. The first walls 221 are perpendicular to the first direction X, i.e., the normal direction of the first walls 221 is parallel to the first direction X, and the second walls 222 are parallel to the first direction X, i.e., the normal direction of the second walls 222 is perpendicular to the first direction X. When multiple battery cells 20 are arranged along the first direction X, the first walls 221 of adjacent battery cells 20 face each other.

[0088] Please refer to Figure 5 、 Figure 6 and Figure 8 The reinforcement member 30 is used to enhance the structural stability of the battery assembly 100. The number of reinforcement members 30 can be one, two, or more. The reinforcement member 30 is located at at least one end of the battery cell assembly, facing the first wall 221 of at least one battery cell 20. The reinforcement member 30 can be an extruded sheet 31 or a composite structure formed by combining the extruded sheet 31 with other components. The reinforcement member 30 can be flat or have grooves, protrusions, or other shapes to accommodate the shape of the battery cell 20 or the housing 10.

[0089] Extruded board 31, also known as extruded polystyrene foam board, is a rigid foam plastic board made from polystyrene resin supplemented with polymers through a heated extrusion molding process. Extruded board 31 has high compressive strength and good thermal insulation. Hollow channel 311 refers to a hollow tubular structure formed within extruded board 31. Hollow channel 311 can be linear, curved, or other shapes. There can be one or more hollow channels 311. When multiple hollow channels 311 are provided within extruded board 31, they can be independent or interconnected. The cross-sectional shape of hollow channel 311 can be circular, triangular, square, trapezoidal, hexagonal, or other shapes.

[0090] It can be understood that the expansion of the positive and negative electrode materials mainly affects the thickness of the electrode sheets, so that the volume expansion of the battery cells 20 mainly occurs in the thickness direction (that is, the width direction), and the expansion effect accumulates in the arrangement direction of the battery cells 20. The battery cells 20 in this embodiment are arranged along the first direction X, so when the multiple battery cells 20 arranged along the first direction X undergo volume expansion, the expansion force accumulates along the first direction X, and finally squeezes the reinforcement 30 through the battery cells 20 located at the end along the first direction X.

[0091] In the embodiment provided by the present application, the battery device 100 includes a box body 10, and a battery cell assembly and a reinforcement 30 arranged in the accommodating cavity 121 of the box body 10, wherein the battery cell assembly includes a plurality of battery cells 20 distributed along a first direction X, the battery cell 20 includes a large first wall 221, and the first wall 221 is perpendicular to the first direction X, the reinforcement 30 includes an extruded plate 31, and the extruded plate 31 is provided at least at one end of the battery cell assembly along the first direction X, so that in the expansion direction of the battery cell 20, at least one end of the battery cell assembly abuts against the extruded plate 31, and the extruded plate 31 has high strength and rigidity, and can provide reliable support and constraint for the plurality of battery cells 20, and when the battery cell 20 expands in volume, the reaction force provided by the extruded plate 31 offsets the force of the battery cell 20 expanding outward, which can It can effectively suppress the expansion of the battery cell 20, thereby reducing the degree of deformation and the risk of rupture of the battery cell 20's own shell 22. At the same time, the expansion of the battery cell 20 is suppressed, and the extrusion caused by it on the box body 10 is correspondingly reduced, thereby effectively reducing the deformation and rupture risks of the box body 10 caused by the expansion of the battery cell 20. Furthermore, the extruded plate 31 has a hollow channel 311 inside. The design of the hollow channel 311 enables the extruded plate 31 to deform to a certain extent when impacted by external force, thereby absorbing more energy, further reducing the impact of the expansion and deformation of the battery cell 20 on the box body 10. At the same time, this design can improve the thermal insulation performance of the extruded plate 31, and can effectively reduce the overall weight of the reinforcement 30 and the battery device 100 while ensuring the compressive strength of the reinforcement 30, thereby improving the performance of the battery device 100.

[0092] Please refer to Figure 2 、 Figure 4 and Figure 5 In some embodiments, the box body 10 includes a box beam 122 , the length direction of the box beam 122 is perpendicular to the first direction X, and the extruded plate 31 is disposed between the battery cell assembly and the box beam 122 .

[0093] The box beam 122 may include side beams 1221 and position-limiting beams 1222. The side beams 1221 may be beam structures disposed around the box body 10, and the position-limiting beams 1222 may be beam structures disposed within the box body 10. The battery device 100 may include one or more reinforcement members 30, with reinforcement members 30 disposed between at least some of the box beams 122 and the battery cell assemblies.

[0094] In the above design, on the one hand, the reinforcement 30 can physically isolate the battery cell 20 and the relative box beam 122, and play a good buffering role between the two, thereby helping to further reduce the risk of deformation and rupture of the box 10 caused by the expansion of the battery cell 20. On the other hand, since the extruded board 31 has good thermal insulation properties, this design can also suppress heat transfer between the battery cell 20 and the box 10, thereby improving the temperature distribution within the battery device 100 and reducing the impact of temperature changes on the performance and life of the battery device 100.

[0095] Please refer to Figure 2 、 Figure 4 and Figure 5 In some embodiments, the box beam 122 includes two side beams 1221 spaced apart along the first direction X, a receiving cavity 121 is formed between the two side beams 1221 , and reinforcement members 30 are provided between the two side beams 1221 and the battery cell assembly.

[0096] The side beams 1221 are beam structures within the housing 10 that define the boundaries of the accommodating cavity 121. Depending on the structure of the housing 10, the side beams 1221 can serve as the side structures of the housing 10 and as the outermost structural components of the housing 10, or they can be located inside the housing 10, that is, inside the outermost structural components of the housing 10. The side beams 1221 can be made of metal, plastic, or other materials.

[0097] For example, two side beams 1221 define a receiving cavity 121 inside the box body 10 along the first direction X. The battery device 100 includes at least two reinforcement members 30. Along the first direction X, the two reinforcement members 30 are respectively arranged on the inner side of the two side beams 1221 facing the receiving cavity 121.

[0098] With the above design, the two reinforcement members 30 can jointly support and restrain the battery cell 20 on different sides along the first direction X, thereby suppressing the expansion of the battery cell 20 on opposite sides of the battery cell 20 at the same time. This is conducive to further reducing the degree of deformation of the battery cell 20's own shell 22 and reducing the risk of deformation and rupture of the box body 10.

[0099] Please refer to Figure 4In some embodiments, the box body 10 includes a bottom plate 12a and a surrounding plate 12b arranged on the bottom plate 12a. The bottom plate 12a and the surrounding plate 12b together form a storage space. One of the two side beams 1221 is used to constitute a portion of the surrounding plate 12b, and the other is arranged in the storage space and is used to separate the storage cavity 121 and the electrical cavity 123 in the storage space.

[0100] For example, the side beam 1221 located in the accommodation space can divide the accommodation space into an accommodation cavity 121 and an electrical cavity 123, wherein the accommodation cavity 121 is used to arrange the battery cell 20 and the cooling system, and the electrical cavity 123 is used to install the battery management system, fuses, relays or other electrical components.

[0101] In the above design, the side beam 1221 can divide the box body 10 into an independent accommodating cavity 121 to store the battery cell 20 separately, thereby improving the flexibility of the structural design of the box body 10. In some cases, by storing the electrical components and the battery cell 20 separately, the safety of the battery device 100 can be improved.

[0102] Please refer to Figure 4 、 Figure 5 and Figure 7 In some embodiments, the box body 10 includes a limiting beam 1222 located in the accommodating cavity 121, and the limiting beam 1222 is used to separate a plurality of sub-cavities for storing battery cell assemblies in the accommodating cavity 121; a reinforcement member 30 is provided between the battery cell assembly and the limiting beam 1222.

[0103] The limiting beam 1222 is a beam structure located between the side beams 1221. It divides the interior space of the housing 10, defines the assembly position of the battery cells 20, and maintains the structural strength of the housing 10. The number and location of the limiting beams 1222 are not unique. Optionally, in one embodiment, the housing 10 includes one limiting beam 1222, which is positioned in the middle of the accommodating cavity 121 along the first direction X and parallel to the side beams 1221. The limiting beam 1222 can be made of metal, plastic, or other materials.

[0104] The two sides of the limiting beam 1222 along the first direction X face different sub-cavities, each of which can accommodate one, two, or more battery cell assemblies. A reinforcement member 30 is provided on one or both sides of the limiting beam 1222. For example, in one specific embodiment, the box body 10 includes two spaced-apart side beams 1221, with a limiting beam 1222 provided between the two side beams 1221. Reinforcements 30 are provided on both sides of the limiting beam 1222 and on the inner sides of the two side beams 1221.

[0105] In the above design, the limiting beam 1222 and the adjacent reinforcement 30 are used to abut against the battery cell 20, which can further improve the support and restraint effect on the battery cell 20, thereby helping to further reduce the deformation degree of the battery cell 20's own shell 22 and reduce the deformation and rupture risk of the box body 10.

[0106] Please refer to Figure 4 and Figure 5 In some embodiments, the extruded plate 31 is opposite to the plurality of battery cell assemblies.

[0107] For example, the battery device 100 includes multiple battery cell assemblies, and the multiple battery cell assemblies are arranged in multiple columns. The battery cells 20 in each column are linearly arranged in a single direction along a first direction X, and the multiple columns of battery cell assemblies are arranged along a second direction Y. In this way, the extruded plate 31 can be simultaneously set at one end of the multiple columns of battery cell assemblies.

[0108] With the above design, the extruded plate 31 can provide the same support and constraint for the battery cells 20 in the multiple battery cell assemblies, thereby helping to keep the expansion of the battery cells in the multiple battery cell assemblies consistent.

[0109] It can be understood that in some other embodiments, multiple battery cell assemblies can be arranged in a row and linearly arranged in a single direction, and each extruded plate 31 corresponds to a column of battery cell assemblies; or, multiple battery cell assemblies can be arranged in multiple columns, and the extruded plates 31 correspond to one column or part of a column of battery cell assemblies.

[0110] Please refer to Figure 5 、 Figure 6 and Figure 7 In some embodiments, the battery device 100 further includes a water cooling plate 40 , which is disposed between the battery cell 20 and the extruded plate 31 .

[0111] The water cooling plate 40 is a heat dissipation structure integrated into the battery device 100. It absorbs heat generated by the battery cells 20 during operation, maintaining the battery cells 20 within a suitable operating temperature range. The water cooling plate 40 can be a flat plate structure to fit well with the battery cells 20 or other components.

[0112] There may be multiple water cooling plates 40 , and the multiple water cooling plates 40 may be arranged along the first direction X and respectively disposed between adjacent battery cells 20 or between a battery cell 20 and the reinforcement 30 .

[0113] In the above design, on the one hand, the water-cooling plate 40 is directly attached to the first wall 221 of the battery cell 20, which can achieve efficient heat conduction and thus have a good heat dissipation effect. On the other hand, the water-cooling plate 40 is integrated with the reinforcement 30 to form an integral structure and jointly support the battery cell 20, which is conducive to improving the support and restraint effect on the battery cell 20, thereby further alleviating the harm caused by the expansion of the battery cell 20.

[0114] Please refer to Figure 10-13 , Figure 10-13 This is a cross-sectional view of a reinforcement member 30 provided in some embodiments of the present application. In some embodiments, at least a portion of the hollow channel 311 extends in a direction parallel to the first wall 221 .

[0115] The hollow channel 311 may extend, but is not limited to, along the second direction Y or the third direction Z. At least a portion of the hollow channel 311 extends parallel to the first wall 221 , so that the hollow channel 311 can face the battery cell 20 , thereby increasing the reliability of the extruded plate 31 .

[0116] In some embodiments, the interior of the extruded plate 31 has a plurality of hollow channels 311 , the plurality of hollow channels 311 penetrate the extruded plate 31 along the length direction of the extruded plate 31 , and the plurality of hollow channels 311 are arranged in parallel.

[0117] The extruded plate 31 includes two contact walls 312 and reinforcing ribs 313 connected between the two contact walls 312. The reinforcing ribs 313 can separate multiple hollow channels 311 inside the extruded plate 31. It can be understood that the setting method of the reinforcing ribs 313 determines the arrangement, shape and size of the hollow channels 311; the multiple hollow channels 311 have multiple arrangement methods in the extruded plate 31, and the cross-sectional shapes and sizes of the multiple hollow channels 311 can be the same or different, and can be specifically designed according to the use requirements of the reinforcement 30.

[0118] With the above design, the extruded plate 31 can better disperse the pressure. This dispersion effect can prevent the extruded plate 31 from being subjected to excessive local force, thereby improving the compression resistance and deformation resistance of the reinforcement 30, so that the reinforcement 30 can better support and restrain the battery cell 20.

[0119] In some embodiments, the volume of the hollow channel 311 in the extruded plate 31 accounts for more than 10%.

[0120] The volume proportion of the hollow channel 311 in the extruded plate 31 refers to the proportion of the volume of the hollow channel 311 occupied by the entire extruded plate 31 .

[0121] The volume ratio of the hollow channels 311 will affect the overall strength and stiffness of the extruded plate 31 . A larger proportion of the hollow channels 311 can provide a larger deformation space, thereby absorbing more energy and improving the buffering capacity of the reinforcement 30 .

[0122] In some embodiments, the extruded sheet 31 is a polycarbonate sheet.

[0123] Polycarbonate is a high-strength, high-toughness engineering plastic. Polycarbonate sheet has good impact resistance and can withstand large external forces without being easily deformed or damaged.

[0124] In some embodiments, the extruded sheet 31 is a polypropylene sheet.

[0125] Polypropylene is a lightweight and high-strength plastic material. Polypropylene boards are lighter in weight and are suitable for use in battery devices 100 that have strict product requirements.

[0126] It is understandable that in some other embodiments, the material of the extruded board 31 can also be polystyrene, polyethylene or other high-strength materials.

[0127] Please refer to Figure 6 and Figure 11 In some embodiments, the reinforcement 30 includes a buffer pad 32 . The buffer pad 32 is disposed on a side of the extruded board 31 facing the first wall 221 . The buffer pad 32 has elastic deformation capability.

[0128] The cushioning pad 32 is made of a material with good elasticity, flexibility, and compressive resistance. For example, the cushioning pad 32 may be made of silicone, rubber, polyurethane foam, etc. The cushioning pad 32 may be directly provided on the entire surface of the extruded plate 31, or may be provided on a portion of the surface of the extruded plate 31 depending on the shape and arrangement of the battery cells 20. The extruded plate 31 may be fixed to the surface of the extruded plate 31 by bonding, snap-fit connection, screw connection, etc.

[0129] In the above design, the buffer pad 32 can physically isolate the battery cell 20 from the extruded plate 31, and can undergo elastic deformation when squeezed, absorb and disperse part of the pressure, so that the buffer pad 32 can reduce the impact of the expansion of the battery cell 20 on the extruded plate 31. In addition, in some cases, reinforcing ribs 313 are formed inside the extruded plate 31, and the structural strength of the extruded plate 31 is higher at the position where the reinforcing ribs 313 are formed. The buffer pad 32 can also evenly disperse the pressure and reduce the stress concentration problem, thereby preventing the battery cell 20's own shell 22 from being deformed and damaged due to uneven force.

[0130] In some embodiments, the thickness of the buffer pad 32 in the first direction X is 0.5 mm to 3 mm.

[0131] For example, the thickness of the buffer pad 32 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0132] The thickness of the cushioning pad 32 directly affects its cushioning capacity. Specifically, as the thickness of the cushioning pad 32 increases, more material is available for elastic deformation, thereby being able to absorb and disperse more pressure.

[0133] In the above design, the thickness of the buffer pad 32 is greater than 0.5 mm, which can ensure that the buffer pad 32 has good buffering capacity. At the same time, the thickness of the buffer pad 32 is less than 3 mm, which can prevent the buffer pad 32 from occupying too much space, thereby helping to improve the energy density of the battery device 100.

[0134] It is understandable that the thickness of the buffer pad 32 can be adjusted according to usage requirements. In some other embodiments, if the buffer pad 32 is required to provide a greater buffering effect, the thickness of the buffer pad 32 can also be designed to be 4 mm, 5 mm, or even a larger size.

[0135] Please refer to Figure 6 、 Figure 8 and Figure 12 In some embodiments, the surface of the reinforcement 30 facing the first wall 221 has an adhesive layer 33 , and the adhesive layer 33 has double-sided adhesiveness.

[0136] The adhesive layer 33 may be made of a polymer material having double-sided adhesive properties, such as double-sided tape, pressure-sensitive adhesive, and the like.

[0137] The adhesive layer 33 can be directly provided on one side surface of the extruded plate 31. Alternatively, in some cases, if a buffer pad 32 is provided on the surface of the extruded plate 31, the adhesive layer 33 can also be provided on one side surface of the buffer pad 32. The adhesive layer 33 can cover the entire surface of the extruded plate 31 or the buffer pad 32, or can be provided on a partial surface of the extruded plate 31 or the buffer layer depending on the shape and arrangement of the battery cells 20.

[0138] The side of the adhesive layer 33 away from the extruded plate 31 can be directly bonded to the first wall 221 of the battery cell 20, or, in some cases, the battery device 100 also includes a water-cooling plate 40, which is arranged in contact with the first wall 221 of the battery cell 20, and the side of the adhesive layer 33 away from the extruded plate 31 can also be bonded to the water-cooling plate 40.

[0139] With the above design, on the one hand, the adhesive layer 33 can connect the extruded board 31 with structures such as the battery cell 20 or the water-cooling plate 40, thereby fixing the position of the reinforcement 30 and preventing the reinforcement 30 from being displaced due to vibration, impact or other external forces, thereby ensuring that the reinforcement 30 can play a reliable buffering and supporting role. On the other hand, the adhesive layer 33 is arranged on the side facing the battery cell 20, so that it can be pre-combined with structures such as the battery cell 20 or the water-cooling plate 40 and assembled in the box body 10 together with these structures. Therefore, this design is also conducive to reducing the difficulty of assembling the reinforcement 30.

[0140] It can be understood that in some other embodiments, the extruded plate 31 is arranged between the battery cell 20 and the box beam 122, and an adhesive layer 33 can also be provided on the side of the extruded plate 31 facing the box beam 122. Before assembling the battery cell 20, the reinforcement 30 can be fixed to the box beam 122 in advance.

[0141] Please refer to Figure 8 and Figure 9 In some embodiments, the adhesive layer 33 includes a double-sided tape adhered to the surface of the buffer pad 32, and the surface of the double-sided tape is covered with a protective film layer such as a release film. In the direction parallel to the surface of the extruded board 31, a portion of the adhesive layer 33 can protrude from the extruded board 31 and the buffer pad 32, which makes it convenient to tear off the release film during the assembly process.

[0142] In some embodiments, the box body 10 includes a bottom plate 12 a , and the side of the reinforcement member 30 facing the bottom plate 12 a is bonded to the bottom plate 12 a by structural adhesive.

[0143] By adopting the above design, the reinforcement 30 can be directly fixed to the box body 10, which can prevent the reinforcement 30 from being displaced due to vibration, impact or other external forces, ensuring that the reinforcement 30 can play a reliable buffering and supporting role between the battery cell 20 and the box body 10. At the same time, this design can also reduce the risk of deformation of the reinforcement 30.

[0144] In a specific embodiment provided in the present application, the battery device 100 includes a box 10 , a battery cell assembly, a reinforcement 30 and a water-cooling plate 40 .

[0145] The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 may be a plate-like structure, and the second housing 12 may be a hollow structure with one end open. The first housing 11 covers the open side of the second housing 12, so that the first housing 11 and the second housing 12 jointly define a storage space. The second housing 12 includes two side beams 1221 and a limiting beam 1222 distributed along a first direction X. One of the two side beams 1221 is located inside the second housing 12, and the other is used to form a panel 12b of the second housing 12. The two side beams 1221 define a storage cavity 121 for placing the battery cell 20 within the second housing 12 along the first direction X. The limiting beam 1222 is arranged between the two side beams 1221 and separates two sub-cavities within the storage cavity 121.

[0146] The battery cell assembly is housed in the housing 10's accommodating cavity 121. Optionally, multiple battery cell assemblies can be housed in different sub-cavities. The battery cell assembly includes multiple battery cells 20 arranged along a first direction X. Each battery cell 20 includes a housing 22 and an end cap 21. The housing 22 can be a hollow structure with one end open. The end cap 21 covers the open side of the housing 22, sealing the housing 22 and forming a sealed space together with the housing 22. The housing 22 can be a rectangular parallelepiped, comprising a first wall 221 extending from the first wall 221 and a second wall 222 connecting the first wall 221. The first wall 221 is perpendicular to the first direction X.

[0147] The water cooling plate 40 is arranged in affixed relation to the battery cell 20. Optionally, the water cooling plate 40 can be arranged in affixed relation to the first wall 221 of the battery cell 20. Along the first direction X, the water cooling plate 40 can be arranged between adjacent battery cells 20, and between the battery cells and the side beams 1221 and the limiting beams 1222.

[0148] A plurality of reinforcement members 30 are respectively arranged between the battery cell 20 and the side beam 1221 or the limiting beam 1222. The reinforcement member 30 includes an extruded plate 31, a buffer pad 32 and an adhesive layer 33 that are stacked. The extruded plate 31 can be a polycarbonate plate or a polypropylene plate; a plurality of hollow channels 311 are formed inside the extruded plate 31, and the volume of the plurality of hollow channels 311 in the extruded plate 31 accounts for more than 10%, and the cross-sectional shape of the plurality of hollow channels 311 can be, but not limited to, circular, triangular, square, trapezoidal, and hexagonal; the buffer pad 32 is arranged on the side of the extruded plate 31 facing the battery cell 20, and the buffer pad 32 has elastic deformation ability. The thickness of the buffer pad 32 in the first direction X is 0.5mm-3mm. For example, the thickness of the buffer pad 32 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. The adhesive layer 33 is arranged on the side of the buffer pad 32 facing the battery cell 20. The adhesive layer 33 can be made of a polymer material with double-sided adhesiveness, such as double-sided tape, pressure-sensitive adhesive, etc. Under the action of the adhesive layer 33, the reinforcement 30 can be directly adhered to the surface of the water-cooling plate 40 to fix its position.

[0149] In the battery device 100 provided in the above embodiment, a reinforcement 30 is provided between the side beams 1221 and the limiting beams 1222 of the box body 10 and the battery cell 20. The reinforcement 30 can provide reliable support and restraint for the battery cell 20, resist the expansion of the battery cell, thereby effectively reducing the degree of deformation of the shell 22 of the battery cell 20 itself, and the reinforcement 30 can also act as a buffer when the battery cell 20 expands, reducing the impact of the expansion of the battery cell 20 on the side beams 1221 and the limiting beams 1222, thereby effectively reducing the risk of deformation and rupture of the box body 10 when the battery cell 20 expands.

[0150] The embodiment of the second aspect of the present application provides a reinforcement member 30 for use in the battery device 100 of the first aspect. The reinforcement member 30 includes an extruded plate 31 and a buffer pad 32 that are fitted together. The buffer pad 32 has elastic deformation capability.

[0151] The reinforcement member 30 provided in the embodiment of the present application can be applied to the battery device 100. When it is arranged close to the battery cell 20, it can play a good buffering and supporting role, thereby reducing the deformation degree of the shell 22 of the battery cell 20 itself, and reducing the risk of deformation and rupture of the box 10 when the battery cell 20 expands, thereby improving the reliability and safety of the battery device 100.

[0152] An embodiment of the third aspect of the present application provides an electrical device, comprising the battery device 100 of the first aspect, and the battery device 100 is used to store or provide electrical energy.

[0153] The electric device provided in the embodiment of the present application improves the reliability and safety of the electric device by adopting the battery device 100 in the first aspect.

[0154] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: A box body having a receiving cavity; a battery cell assembly disposed in the accommodating cavity, the battery cell assembly comprising a plurality of battery cells distributed along a first direction, the battery cell comprising a housing, the housing comprising a first wall perpendicular to the first direction and a second wall parallel to the first direction, the area of the first wall being greater than the area of the second wall; A reinforcement member is arranged in the accommodating cavity, and the reinforcement member includes an extruded plate with a hollow channel inside. The extruded plate is arranged at at least one end of the battery cell assembly along the first direction.

2. The battery device according to claim 1, wherein: The box body includes a box beam, the length direction of the box beam is perpendicular to the first direction, and the extruded plate is arranged between the battery cell assembly and the box beam.

3. The battery device according to claim 2, wherein: The box beam includes two side beams spaced apart along the first direction, the accommodation cavity is formed between the two side beams, and the reinforcement is provided between the two side beams and the battery cell assembly.

4. The battery device according to claim 3, wherein: The box body includes a bottom plate and a surrounding plate arranged on the bottom plate, and the bottom plate and the surrounding plate together form a storage space. One of the two side beams is used to constitute part of the surrounding plate, and the other is arranged in the storage space and is used to separate the storage cavity and the electrical cavity in the storage space.

5. The battery device according to claim 3, wherein: The box beam includes a limiting beam located in the accommodating cavity, and the limiting beam is used to separate a plurality of sub-cavities in the accommodating cavity for storing the battery cell assemblies; the reinforcement is provided between the battery cell assemblies and the limiting beam.

6. The battery device according to claim 1, wherein: The extruded plate is opposite to the plurality of battery cell assemblies.

7. The battery device according to claim 1, wherein: The battery device further includes a water cooling plate, which is arranged between the battery cells and the extruded plate.

8. The battery device according to any one of claims 1 to 7, wherein: At least a portion of the hollow channel extends in a direction parallel to the first wall.

9. The battery device according to claim 8, wherein: The interior of the extruded board is provided with a plurality of hollow channels, the plurality of hollow channels penetrate the extruded board along the length direction of the extruded board, and the plurality of hollow channels are arranged in parallel.

10. The battery device according to claim 8, wherein The volume of the hollow channel in the extruded board accounts for more than 10%.

11. The battery device according to any one of claims 1 to 7, wherein: The extruded board is a polycarbonate board or a polypropylene board.

12. The battery device according to any one of claims 1 to 7, wherein: The reinforcement comprises a buffer pad, which is arranged on a side of the extruded plate facing the first wall, and has elastic deformation capability.

13. The battery device according to claim 12, wherein: The thickness of the buffer pad in the first direction is 0.5 mm to 3 mm.

14. The battery device according to any one of claims 1 to 3, wherein: The surface of the reinforcement facing the first wall has an adhesive layer, and the adhesive layer has double-sided adhesiveness.

15. A reinforcement member, characterized in that: Used in the battery device according to any one of claims 1 to 14, the reinforcement comprises an extruded plate and a buffer pad that are closely arranged, and the buffer pad has elastic deformation capability.

16. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 14, wherein the battery device is used to store or provide electrical energy.

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