Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and relates to the field of batteries, the battery device comprises a box body and a battery monomer, the box body is provided with a box body bottom wall, the box body bottom wall is located below the battery monomer to support the battery monomer along the height direction of the battery device, the box body bottom wall defines a mounting cavity, and the box body bottom wall is provided with a supporting wall; the supporting wall is located in the mounting cavity and obliquely connected between the cavity top wall and the cavity bottom wall of the mounting cavity. Therefore, the supporting wall is positioned in the mounting cavity and is obliquely connected between the cavity top wall and the cavity bottom wall, so that when the box body bottom wall is impacted, the cavity bottom wall and the supporting wall can deform to absorb energy, the stress of the battery monomer can be reduced, and the risk of extruding the battery monomer due to deformation of the box body bottom wall can be reduced, thereby reducing the deformation and damage risk of the battery monomer; in addition, the box body bottom wall is simple in structure, the manufacturing difficulty of the box body bottom wall is reduced, and therefore the manufacturing cost of the battery device is reduced.

Description

Technical Field

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

[0002] In the related art, the battery device includes a box body and a battery cell, and the battery cell is installed in the box body. When the bottom of the battery device is hit, the bottom wall of the box body is easily deformed and squeezes the battery cell, causing the battery cell to deform and be damaged, etc., reducing the reliability of the battery device. In addition, the structure of the bottom wall of the box body is complex, resulting in complex processing and high cost of the bottom wall of the box body. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery device, which can reduce the force on the battery cells when the bottom wall of the box body of the battery device is hit, which is conducive to improving the reliability of the battery device, and the structure of the bottom wall of the box body is simple.

[0004] The present application further proposes an electrical device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, including:

[0006] A box body and a battery cell, wherein the battery cell is arranged in the box body, the box body has a box body bottom wall, and along the height direction of the battery device, the box body bottom wall is located below the battery cell to support the battery cell, the box body bottom wall defines a mounting cavity, the box body bottom wall has a supporting wall, the supporting wall is located in the mounting cavity, and the supporting wall is obliquely connected between the cavity top wall and the cavity bottom wall of the mounting cavity;

[0007] The cavity side wall of the installation cavity is parallel to the height direction of the battery device.

[0008] In the above technical solution, the installation cavity is defined by the bottom wall of the box, which is conducive to reducing the weight of the bottom wall of the box, thereby reducing the weight of the battery device, and facilitating the lightweight design of the battery device. In addition, when the bottom wall of the box is hit, it is conducive to the deformation and energy absorption of the bottom wall of the box, which can reduce the force on the battery cell, and can reduce the risk of the bottom wall of the box deforming and squeezing the battery cell, thereby reducing the risk of deformation and damage of the battery cell, which is conducive to improving the reliability of the battery device. By setting the side wall of the installation cavity parallel to the height direction of the battery device, the two adjacent bottom walls of the box are easy to assemble, reducing the risk of deformation of the bottom wall of the box during welding, which is conducive to improving the connection quality and connection strength between the two adjacent bottom walls of the box.

[0009] By obliquely connecting the support wall between the top wall and the bottom wall of the installation cavity, the support wall can reliably support the top wall and the bottom wall of the cavity, so that the bottom wall of the box body has sufficient strength to support the battery cell, and when the bottom wall of the box body is hit, that is, when the bottom wall of the cavity is hit, the inclined setting of the support wall is conducive to the deformation and energy absorption of the bottom wall of the cavity and the support wall, which can further reduce the force on the battery cell, and can further reduce the risk of the bottom wall of the box body deforming and squeezing the battery cell, thereby further reducing the risk of deformation and damage of the battery cell, which is more conducive to improving the reliability of the battery device, and the structure of the bottom wall of the box body is simple, which is conducive to reducing the difficulty of manufacturing the bottom wall of the box body, thereby reducing the manufacturing cost of the battery device.

[0010] In some embodiments, an angle formed by the support wall and the height direction of the battery device is greater than or equal to 15° and less than or equal to 70°.

[0011] In the above technical solution, the angle formed by the support wall and the height direction of the battery device is greater than or equal to 15° and less than or equal to 70°, and the inclination angle of the support wall is appropriate, so that the spacing distance between the cavity top wall and the cavity bottom wall is appropriate. When the bottom wall of the box body is impacted, it is beneficial for the support wall and the cavity bottom wall to deform and absorb energy, thereby facilitating the deformation and energy absorption of the bottom wall of the box body. In addition, the thickness of the bottom wall of the box body can also be made appropriate, which is beneficial to reducing the larger space of the battery device occupied by the bottom wall of the box body along the height direction, so that there is more space in the box body to install battery cells, which is beneficial to improving the energy density of the battery device.

[0012] In some embodiments, at least one of the cavity top wall and the cavity bottom wall is perpendicular to a height direction of the battery device.

[0013] In the above technical solution, the cavity top wall and the height direction of the battery device are perpendicular, which is conducive to improving the surface flatness of the bottom wall of the box body facing the battery cell and reducing the risk of the bottom wall of the box body tilting towards the battery cell. After the battery cell is installed on the bottom wall of the box body, the bottom wall of the box body can reliably support the battery cell and reduce the risk of the battery cell shifting, so that the battery cell can be stably installed on the bottom wall of the box body. The cavity bottom wall and the height direction of the battery device are perpendicular, which is conducive to improving the flatness of the lower surface of the bottom wall of the box body and reducing the risk of the lower surface tilting of the bottom wall of the box body. After the battery device is placed on the ground or on a placement table, the risk of the battery device swinging is reduced, so that the battery device can be stably placed on the ground or on a placement table, and the risk of the battery device falling is reduced when the battery device is placed on the placement table.

[0014] In some embodiments, the thickness of the support wall is greater than or equal to 1 mm and less than or equal to 3 mm.

[0015] In the above technical solution, by making the thickness of the support wall greater than or equal to 1mm and less than or equal to 3mm, the thickness of the support wall can be made appropriate, so that the support wall has sufficient strength. When the impact force on the bottom wall of the box body is less than a certain value, the bottom wall of the cavity can be deformed to absorb the impact force. At this time, the support wall does not deform and can also protect the battery cell. The support wall can be reliably supported between the bottom wall of the cavity and the top wall of the cavity, which is conducive to reducing the deformation of the bottom wall of the cavity and extending the service life of the battery device. When the impact force on the bottom wall of the box body is greater than a certain value, it is conducive to the deformation of the support wall to absorb energy and reduce the risk of the top wall of the cavity deforming and squeezing the battery cell, thereby further reducing the risk of deformation and damage of the battery cell, which is more conducive to improving the reliability of the battery device. In addition, by making the thickness of the support wall greater than or equal to 1mm and less than or equal to 3mm, it is conducive to the manufacturing and molding of the support wall and the lightweight design of the battery device.

[0016] In some embodiments, there are multiple supporting walls, and two adjacent supporting walls are spaced apart.

[0017] In the above technical solution, by setting a plurality of support walls and spacing any two adjacent support walls, the plurality of support walls are dispersedly arranged, and the plurality of support walls are simultaneously supported between the cavity bottom wall and the cavity top wall, which is beneficial to improving the structural strength of the bottom wall of the box body, so that the bottom wall of the box body meets the structural strength requirements, and when the bottom wall of the box body is impacted, the plurality of support walls can deform and absorb energy at the same time, which is beneficial to improving the energy absorption performance of the bottom wall of the box body, can further reduce the force on the battery cell, can further reduce the risk of the bottom wall of the box body deforming and squeezing the battery cell, thereby further reducing the risk of deformation and damage of the battery cell, and is more beneficial to improving the reliability of the battery device.

[0018] In some embodiments, the plurality of support walls are arranged along a first direction, and each support wall extends along a second direction, and the first direction, the second direction, and a height direction of the battery device are perpendicular to each other.

[0019] In the above technical solution, by arranging multiple support walls along the first direction and each support wall extending along the second direction, the multiple support walls can be arranged at different positions of the bottom wall of the box, which is beneficial to improving the consistency of the energy absorption effect at different positions of the bottom wall of the box. In addition, the setting area of ​​the support wall can be increased, which is beneficial to reducing the number of support walls, thereby facilitating the production of the bottom wall of the box and improving the production efficiency of the box.

[0020] In some embodiments, the plurality of support walls are parallel to each other.

[0021] In the above technical solution, multiple supporting walls are parallel to each other, which is helpful to simplify the structure of the bottom wall of the box body and facilitate the production of the bottom wall of the box body, thereby helping to improve the production efficiency of the battery device, and also helping to improve the structural consistency of different positions of the bottom wall of the box body and improve the energy absorption consistency of different positions of the bottom wall of the box body.

[0022] In some embodiments, at least two supporting walls have different inclination directions; and / or

[0023] At least two supporting walls have different inclination angles.

[0024] In the above technical solution, by having at least two supporting walls with different inclination directions and / or at least two supporting walls with different inclination angles, the ability of the bottom wall of the box to resist deformation is improved while ensuring that the bottom wall of the box meets the energy absorption performance.

[0025] In some embodiments, there are multiple battery cells, and the multiple battery cells are all fixed to the cavity top wall. Along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the corresponding battery cells.

[0026] In the above technical solution, along the height direction of the battery device, the connecting ends of the support wall and the cavity top wall are arranged corresponding to the corresponding battery cells. When the bottom wall of the box body is impacted, on the basis of satisfying the deformation energy absorption of the support wall, the battery cells can restrain the deformation of the bottom wall of the box body, so that the impact force can be effectively dispersed, which is beneficial to reducing the deformation of the bottom wall of the box body, thereby helping to reduce the risk of the cavity top wall deformation aggravating the squeezing of the battery cells, thereby further improving the safety of the battery device.

[0027] In some embodiments, a plurality of battery cells form at least one row of battery cells, each row of battery cells includes a plurality of battery cells, and the plurality of battery cells in each row of battery cells are arranged sequentially along a first direction, and along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the middle areas of the corresponding battery cells, and the first direction is perpendicular to the height direction of the battery device.

[0028] In the above technical solution, along the height direction of the battery device, the connecting ends of the support wall and the cavity top wall are arranged corresponding to the middle areas of the corresponding battery cells. When the bottom wall of the box body is impacted, on the basis of satisfying the deformation and energy absorption of the support wall, the battery cells can better restrain the deformation of the bottom wall of the box body, and can better effectively disperse the impact force, which is more conducive to reducing the deformation of the bottom wall of the box body, thereby being more conducive to reducing the risk of aggravated squeezing of the battery cells by the deformation of the cavity top wall, thereby further improving the safety of the battery device. Moreover, when the bottom wall of the box body is impacted, the risk of force being transmitted to the edge of the battery cell can be reduced, thereby reducing the risk of the battery cell being ruptured due to force, which is conducive to improving the safety of the battery cell and is also conducive to the deformation and energy absorption of the support wall.

[0029] In some embodiments, there are multiple battery cells, all of which are fixed to the cavity top wall, forming an assembly gap between two adjacent battery cells, and along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the corresponding assembly gaps.

[0030] In the above technical solution, along the height direction of the battery device, the connecting ends of the support wall and the cavity top wall are arranged corresponding to the corresponding assembly gaps. When the bottom wall of the box body is hit, it is beneficial for the support wall to deform and absorb energy, which is beneficial to reducing the deformation of the bottom wall of the box body, thereby reducing the risk of the cavity top wall deformation exacerbating the squeezing of the battery cell, thereby further improving the safety of the battery device.

[0031] In some embodiments, a supporting boss protruding toward the cavity bottom wall is formed on the inner surface of the cavity top wall, and the supporting boss is spaced apart from the cavity bottom wall.

[0032] In the above technical solution, a supporting boss protruding toward the bottom wall of the cavity is formed through the inner surface of the cavity top wall, and the supporting boss is spaced apart from the cavity bottom wall. When the bottom wall of the box body is impacted and the cavity bottom wall is deformed and squeezes the supporting boss, the supporting boss can deform and absorb energy, which is beneficial to improving the energy absorption capacity of the bottom wall of the box body, can further reduce the force on the battery cell, can further reduce the risk of the bottom wall of the box body deforming and squeezing the battery cell, thereby further reducing the risk of deformation and damage of the battery cell, and is more beneficial to improving the reliability of the battery device.

[0033] In some embodiments, along the height direction of the battery device, the supporting bosses correspond to corresponding battery cells.

[0034] In the above technical solution, along the height direction of the battery device, the supporting bosses are arranged corresponding to the corresponding battery cells. When the bottom wall of the box body is impacted, on the basis of satisfying the deformation energy absorption of the supporting bosses, the battery cells can restrain the deformation of the bottom wall of the box body, and can effectively disperse the impact force, which is beneficial to reducing the deformation of the bottom wall of the box body, thereby helping to reduce the risk of the top wall of the cavity being deformed and aggravating the squeezing of the battery cells, thereby further improving the safety of the battery device.

[0035] In some embodiments, there are multiple battery cells, and the multiple battery cells are all fixed to the top wall of the cavity, an assembly gap is formed between two adjacent battery cells, and the supporting bosses correspond to the corresponding assembly gaps.

[0036] In the above technical solution, along the height direction of the battery device, the supporting bosses are arranged correspondingly to the corresponding assembly gaps. When the bottom wall of the box body is hit, it is beneficial for the supporting bosses to deform and absorb energy, which is beneficial for reducing the deformation of the bottom wall of the box body, thereby reducing the risk of the top wall of the cavity being deformed and aggravating the squeezing of the battery cell, thereby further improving the safety of the battery device.

[0037] In some embodiments, the battery device further includes: a protective layer, the protective layer being disposed on a surface of the cavity bottom wall facing away from the cavity top wall.

[0038] In the above technical solution, the protective layer is arranged on the surface of the cavity bottom wall away from the cavity top wall. When the bottom of the bottom wall of the box body is hit, the protective layer can preferentially absorb the collision energy, and can reduce the collision energy transferred to the bottom wall of the box body and the battery cell. The protective layer can protect the bottom wall of the box body, reduce the risk of the bottom wall of the box body being damaged by the bottom gravel, and is beneficial to improving the impact resistance of the bottom wall of the box body.

[0039] In some embodiments, there are multiple bottom walls of the box body, and the multiple bottom walls of the box body are arranged along a plane perpendicular to the height direction of the battery device, and any two adjacent bottom walls of the box body are fixedly connected by the side walls of the installation cavity.

[0040] In the above technical solution, any two adjacent bottom walls of the box are fixedly connected through the side walls of the mounting cavity, and the side walls of the mounting cavity are arranged parallel to the height direction of the battery device, so that the two adjacent bottom walls of the box are easy to assemble, reducing the risk of deformation of the bottom wall of the box during welding, which is conducive to improving the connection quality and connection strength between the two adjacent bottom walls of the box. In addition, by setting multiple bottom walls of the box, the bottom wall of the second box of the corresponding shape can be assembled, so that the second box meets the use requirements.

[0041] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0046] Figure 3 is a top view of a battery device according to an embodiment of the present application;

[0047] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0048] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0049] Figure 6 is a cross-sectional view of a battery device according to some other embodiments of the present application;

[0050] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0051] Figure 8 yes Figure 6 Enlarged view of point D in the middle;

[0052] Fig. 9 is a schematic diagram of a battery cell according to an embodiment of the present application.

[0053] Reference numerals:

[0054] Battery device 100;

[0055] The second box 10;

[0056] Box bottom wall 11; mounting cavity 111; support wall 112; connection end 113; support boss 114; cavity bottom wall 115; cavity top wall 116; cavity side wall 117;

[0057] Battery cell 20;

[0058] Battery cell row 30;

[0059] Assembly clearance 40;

[0060] Protective layer 50; heat exchange plate 60;

[0061] Vehicle 200 ; controller 201 ; motor 202 . DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0064] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, E and / or F can represent: E exists alone, E and F exist at the same time, and F exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0067] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0068] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0069] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0070] The term “plurality” used in this application refers to two or more (including two).

[0071] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0072] The battery cell can be 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0073] The battery cell can be cylindrical, flat, rectangular or other shapes, and the present application embodiment does not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the present application embodiment does not limit this.

[0074] The battery device 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 a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0075] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0076] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0077] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0078] 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.

[0079] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0080] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box, and the closed space can accommodate the battery cell assembly, that is, the battery cell assembly is installed in the closed space. The closed here means covered or closed, which can be sealed or unsealed. The first box can be one of the upper box and the lower box, and the second box can be the other of the upper box and the lower box.

[0081] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0082] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0083] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of an anode pole piece, a cathode pole piece and a separator. The battery cell mainly relies on the movement of metal ions between the anode pole piece and the cathode pole piece to work. The anode pole piece includes an anode current collector and an anode active material layer, the anode active material layer is coated on the surface of the anode current collector, the anode current collector not coated with the anode active material layer protrudes from the anode current collector coated with the anode active material layer, and the anode current collector not coated with the anode active material layer serves as the anode pole ear. Taking lithium-ion batteries as an example, the material of the anode current collector can be aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The cathode pole piece includes a cathode current collector and a cathode active material layer, the cathode active material layer is coated on the surface of the cathode current collector, the cathode current collector not coated with the cathode active material layer protrudes from the cathode current collector coated with the cathode active material layer, and the cathode current collector not coated with the cathode active material layer serves as the cathode pole ear. The material of the cathode current collector can be copper, and the cathode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of anode tabs is multiple and they are stacked together, and the number of cathode tabs is multiple and they are stacked together.

[0084] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0085] In recent years, battery devices have developed rapidly. Battery devices can be installed in vehicles, laptops, electric vehicles, electric toys, etc. This application takes the installation of battery devices on new energy vehicles as an example for explanation. In recent years, new energy vehicles have made leaps and bounds. In the field of electric vehicles, battery devices play an irreplaceable and important role as the power source of electric vehicles. As the core components of new energy vehicles, battery devices have high requirements in terms of reliability.

[0086] The battery device is installed on the chassis of the vehicle. When the bottom wall of the battery device is hit, the bottom wall of the box is easily deformed and squeezes the battery cells, causing deformation and damage to the battery cells, reducing the reliability of the battery device. In addition, the structure of the bottom wall of the box is complex, resulting in complex and costly processing of the bottom wall.

[0087] Based on the above considerations, in order to solve the problems of deformation and damage of battery cells in a battery device caused by impact on the bottom wall of the box, after in-depth research, a battery device is designed, which includes: a box and a battery cell, the battery cell is arranged in the box, the box has a box bottom wall, along the height direction of the battery device, the box bottom wall is located below the battery cell to support the battery cell, the box bottom wall defines an installation cavity, the box bottom wall has a support wall, the support wall is located in the installation cavity, and the support wall is obliquely connected between the cavity top wall and the cavity bottom wall of the installation cavity. When the bottom of the battery device is impacted, the cavity bottom wall and the support wall can be deformed to absorb energy. Compared with the prior art, the force on the battery cell can be reduced, and the risk of the box bottom wall deforming and squeezing the battery cell can be reduced, thereby reducing the risk of deformation and damage of the battery cell, which is conducive to improving the reliability of the battery device, and the structure of the box bottom wall is simple, which is conducive to reducing the difficulty of manufacturing the box bottom wall, thereby reducing the manufacturing cost of the battery device.

[0088] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 200 provided for some embodiments of the present application. The vehicle 200 may be a fuel vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The battery device 100 is installed on the chassis of the vehicle 200. The battery device 100 can be used to power the vehicle 200, for example, the battery device 100 can be used as an operating power source for the vehicle 200. The vehicle 200 may also include a controller 201 and a motor 202, and the controller 201 is used to control the battery device 100 to power the motor 202, for example, for the starting, navigation, and working power requirements of the vehicle 200 during driving.

[0089] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 200 , but also serve as a driving power source for the vehicle 200 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200 .

[0090] Reference below Figure 2-Figure 8 The battery device 100 according to the embodiment of the present application is described by taking the battery device 100 installed on the chassis of the vehicle 200 as an example.

[0091] like Figure 2-Figure 5 As shown, according to the battery device 100 of the embodiment of the present application, the battery device 100 includes:

[0092] A box body and a battery cell 20, the battery cell 20 is arranged in the box body, the box body has a box body bottom wall 11, along the height direction of the battery device 100, the box body bottom wall 11 is located below the battery cell 20 to support the battery cell 20, the box body bottom wall 11 defines an installation cavity 111, the box body bottom wall 11 has a support wall 112, the support wall 112 is located in the installation cavity 111, and the support wall 112 is obliquely connected between the cavity top wall 116 and the cavity bottom wall 115 of the installation cavity 111.

[0093] When the battery device 100 is installed on the vehicle 200, the length direction of the battery device 100 is parallel to the driving direction of the vehicle 200, and the width direction of the battery device 100 is parallel to the width direction of the vehicle 200. Figure 2 As shown, the length direction of the battery device 100 is Figure 2 The X direction of the battery device 100 is Figure 2 in the Y direction.

[0094] The battery device 100 includes: a box body and a battery cell 20, the box body can define a closed space, and the battery cell 20 is arranged in the closed space. As an example, the box body may include a first box body and a second box body 10, the first box body may be an upper box body, the second box body 10 may be a lower box body, and the first box body and the second box body 10 are fixedly connected to jointly define a closed space. The box body has a box body bottom wall 11, and the bottom wall of the second box body 10 is the bottom wall of the closed space. The box body bottom wall 11 may be at least a partial structure of the bottom wall of the second box body 10. In other words, the box body bottom wall 11 may be at least a partial structure of the bottom wall of the closed space. Along the height direction of the battery device 100, after the battery device 100 is installed on the vehicle 200, the height direction of the battery device 100 is parallel to the height direction of the vehicle 200. The bottom wall 11 of the box is constructed as the bottom wall of the closed space. After the battery cell 20 is installed in the closed space, the bottom wall 11 of the box is located below the battery cell 20. The bottom wall 11 of the box can support the battery cell 20. The battery cell 20 can be fixed to the bottom wall 11 of the box, and the battery cell 20 can be bonded to the bottom wall 11 of the box.

[0095] The bottom wall 11 of the box body defines an installation cavity 111, and the installation cavity 111 can be a closed cavity or an unclosed cavity. The installation cavity 111 is defined by the bottom wall 11 of the box body, which is conducive to reducing the weight of the bottom wall 11 of the box body, thereby reducing the weight of the battery device 100, and facilitating the lightweight design of the battery device 100. Moreover, when the bottom wall 11 of the box body is impacted, it is conducive to the deformation and energy absorption of the bottom wall 11 of the box body, which can reduce the force on the battery cell 20, and can reduce the risk of the bottom wall 11 of the box body deforming and squeezing the battery cell 20, thereby reducing the risk of deformation and damage of the battery cell 20, and is conducive to improving the reliability of the battery device 100. The bottom wall 11 of the box body has a support wall 112, and the support wall 112 is located in the installation cavity 111. At least one support wall 112 can be provided in the installation cavity 111. This application takes the example of multiple support walls 112 provided in the installation cavity 111 as an example for explanation, and any two adjacent support walls 112 can be spaced apart.

[0096] The support wall 112 may be a plate-like structure. As an example, the support wall 112 may be a flat plate-like structure. As another example, the support wall 112 may be a roughly flat plate-like structure. As another example, the support wall 112 may be a plate with a bending structure. This application is described using the support wall 112 as a flat plate-like structure as an example.

[0097] Along the height direction of the battery device 100, the cavity top wall 116 is located above the cavity bottom wall 115, and the cavity top wall 116 and the cavity bottom wall 115 are spaced apart. The battery cell 20 can be fixed to the cavity top wall 116, and the cavity top wall 116 supports the battery cell 20. The support wall 112 is obliquely connected between the cavity top wall 116 and the cavity bottom wall 115 of the installation cavity 111, and the upper end of the support wall 112 is fixedly connected to the cavity top wall 116, and the lower end of the support wall 112 is fixedly connected to the cavity bottom wall 115. Along the height direction of the battery device 100, the upper end of the support wall 112 and the lower end of the support wall 112 are staggered, which can also be understood as that the upper end of the support wall 112 and the lower end of the support wall 112 are at least partially staggered. In other words, along the height direction of the battery device 100, the orthographic projection of the upper end of the support wall 112 and the orthographic projection of the lower end of the support wall 112 are staggered. It can also be understood that the orthographic projection of the upper end of the support wall 112 and the orthographic projection of the lower end of the support wall 112 are at least partially staggered.

[0098] By obliquely connecting the support wall 112 between the cavity top wall 116 and the cavity bottom wall 115 of the installation cavity 111, the support wall 112 can reliably support the cavity top wall 116 and the cavity bottom wall 115, so that the box bottom wall 11 has sufficient strength to support the battery cell 20, and when the box bottom wall 11 is impacted, that is, when the cavity bottom wall 115 is impacted, the inclined setting of the support wall 112 is conducive to the deformation and energy absorption of the cavity bottom wall 115 and the support wall 112, which can further reduce the force on the battery cell 20 and the risk of the box bottom wall 11 deforming and squeezing the battery cell 20, thereby further reducing the risk of deformation and damage of the battery cell 20, which is more conducive to improving the reliability of the battery device 100. In addition, the structure of the box bottom wall 11 is simple, which is conducive to reducing the difficulty of manufacturing the box bottom wall 11, thereby reducing the manufacturing cost of the battery device 100.

[0099] In the above technical solution, the support wall 112 is located in the installation cavity 111 and is obliquely connected between the cavity top wall 116 and the cavity bottom wall 115. When the bottom wall 11 of the box body is impacted, the cavity bottom wall 115 and the support wall 112 can deform and absorb energy, which can reduce the force on the battery cell 20 and reduce the risk of the bottom wall 11 of the box body deforming and squeezing the battery cell 20. The risk of deformation and damage to the battery cell 20 can be reduced, which is beneficial to improving the reliability of the battery device 100. In addition, the structure of the bottom wall 11 of the box body is simple, which is beneficial to reducing the difficulty of manufacturing the bottom wall 11 of the box body, thereby reducing the manufacturing cost of the battery device 100.

[0100] According to some embodiments of the present application, Figure 5 and Figure 7 As shown, the angle formed by the support wall 112 and the height direction of the battery device 100 is greater than or equal to 15° and less than or equal to 70°.

[0101] Among them, Figure 5 As shown, the height direction of the battery device 100 is Figure 5In the Z direction, the angle formed by the support wall 112 and the height direction of the battery device 100 is β1, which satisfies the relationship: 15°≤β1≤70°. The angle formed by the support wall 112 and the height direction of the battery device 100 can be 15°, 20°, 30°, 60°, 70° and other values. The angle formed by the support wall 112 and the height direction of the battery device 100 can be reasonably selected and designed according to actual conditions. As an example, both the cavity top wall 116 and the cavity bottom wall 115 can be flat plates, and both the cavity top wall 116 and the cavity bottom wall 115 are perpendicular to the height direction of the battery device 100. An angle β2 is formed between the support wall 112 and the cavity bottom wall 115, satisfying the relationship: 20°≤β2≤75°. The angle formed between the support wall 112 and the cavity bottom wall 115 can be 20°, 25°, 30°, 60°, 70°, 75° and other values. The angle formed between the support wall 112 and the cavity bottom wall 115 can be reasonably selected and designed according to actual conditions.

[0102] It should be noted that if the angle formed by the support wall 112 and the height direction of the battery device 100 is less than 15°, the distance between the cavity top wall 116 and the cavity bottom wall 115 is large, resulting in a large thickness of the box bottom wall 11, so that the box bottom wall 11 occupies a large space of the battery device 100 along the height direction, affecting the energy density of the battery device 100, and when the box bottom wall 11 is hit, it is not conducive to the deformation and energy absorption of the support wall 112, thereby not conducive to the deformation and energy absorption of the box bottom wall 11. If the angle formed by the support wall 112 and the height direction of the battery device 100 is greater than 70°, the distance between the cavity top wall 116 and the cavity bottom wall 115 is small, so that the volume of the installation cavity 111 is small, and when the box bottom wall 11 is hit, it is not conducive to the deformation and energy absorption of the box bottom wall 11.

[0103] In the above technical solution, the angle formed by the support wall 112 and the height direction of the battery device 100 is greater than or equal to 15° and less than or equal to 70°, and the inclination angle of the support wall 112 is appropriate, so that the spacing distance between the cavity top wall 116 and the cavity bottom wall 115 is appropriate. When the bottom wall 11 of the box body is impacted, it is beneficial for the support wall 112 and the cavity bottom wall 115 to deform and absorb energy, thereby facilitating the deformation and energy absorption of the bottom wall 11 of the box body. In addition, the thickness of the bottom wall 11 of the box body can also be made appropriate, which is beneficial to reducing the larger space occupied by the bottom wall 11 of the box body in the height direction of the battery device 100, so that there is more space in the box body to install the battery cell 20, which is beneficial to improving the energy density of the battery device 100.

[0104] According to some embodiments of the present application, Figure 5 and Figure 7 As shown, at least one of the cavity top wall 116 and the cavity bottom wall 115 is perpendicular to the height direction of the battery device 100 .

[0105] Among them, at least one of the cavity top wall 116 and the cavity bottom wall 115 is perpendicular to the height direction of the battery device 100, that is, the cavity top wall 116 is perpendicular to the height direction of the battery device 100, or the cavity bottom wall 115 is perpendicular to the height direction of the battery device 100, or the cavity top wall 116 and the cavity bottom wall 115 are both perpendicular to the height direction of the battery device 100. This application is described by taking the cavity top wall 116 and the cavity bottom wall 115 as an example that both the cavity top wall 116 and the cavity bottom wall 115 are perpendicular to the height direction of the battery device 100. As an example, the cavity top wall 116 and the cavity bottom wall 115 can both be flat plates, the cavity top wall 116 and the cavity bottom wall 115 can be parallel, and the cavity top wall 116 and the cavity bottom wall 115 are both perpendicular to the height direction of the battery device 100.

[0106] In the above technical solution, the cavity top wall 116 is perpendicular to the height direction of the battery device 100, which is conducive to improving the surface flatness of the bottom wall 11 of the box body facing the battery cell 20, reducing the risk of the surface of the bottom wall 11 of the box body facing the battery cell 20 tilting, and after the battery cell 20 is installed on the bottom wall 11 of the box body, the bottom wall 11 of the box body can reliably support the battery cell 20, reducing the risk of the battery cell 20 shifting, so that the battery cell 20 is stably installed on the bottom wall 11 of the box body. The cavity bottom wall 115 is perpendicular to the height direction of the battery device 100, which is conducive to improving the flatness of the lower surface of the bottom wall 11 of the box body, reducing the risk of the lower surface of the bottom wall 11 of the box body tilting, and after the battery device 100 is placed on the ground or on a placement table, the risk of the battery device 100 swinging is reduced, so that the battery device 100 is stably placed on the ground or on a placement table, and when the battery device 100 is placed on the placement table, the risk of the battery device 100 falling is reduced.

[0107] According to some embodiments of the present application, the thickness of the support wall 112 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0108] Among them, when the support wall 112 is a flat plate, the thickness of the support wall 112 at different positions is the same or approximately the same, the thickness dimension of the support wall 112 is D1, and the relationship: 1mm≤D1≤3mm is satisfied, the thickness dimension of the support wall 112 can be 1mm, 2mm, 2.5mm, 3mm and other values, and the thickness dimension of the support wall 112 can be reasonably selected and set according to actual conditions. When the support wall 112 is not a flat plate, the maximum value of the thickness dimension of the support wall 112 at different positions is 3mm, and the minimum value of the thickness dimension of the support wall 112 at different positions is 1mm.

[0109] In the above technical solution, the thickness of the support wall 112 is greater than or equal to 1 mm and less than or equal to 3 mm, so that the thickness of the support wall 112 can be appropriate, and the support wall 112 has sufficient strength. When the impact force on the bottom wall 11 of the box body is less than a certain value, the cavity bottom wall 115 can be deformed to absorb the impact force. At this time, the support wall 112 does not deform and can also protect the battery cell 20. The support wall 112 can be reliably supported between the cavity bottom wall 115 and the cavity top wall 116, which is conducive to reducing the deformation of the cavity bottom wall 115 and extending the service life of the battery device 100. When the impact force on the bottom wall 11 of the box body is greater than a certain value, it is conducive to the deformation of the support wall 112 to absorb energy and reduce the risk of deformation of the cavity top wall 116 to squeeze the battery cell 20, thereby further reducing the risk of deformation and damage of the battery cell 20, which is more conducive to improving the reliability of the battery device 100. In addition, the thickness of the support wall 112 is greater than or equal to 1 mm and less than or equal to 3 mm, which is conducive to the manufacturing and molding of the support wall 112 and the lightweight design of the battery device 100.

[0110] According to some embodiments of the present application, there are multiple support walls 112 , and two adjacent support walls 112 are spaced apart.

[0111] Among them, the supporting wall 112 can be set to be multiple, and the number of the supporting walls 112 can be set to two, three, four, five, etc. The number of the supporting walls 112 can be reasonably selected and designed according to the setting area of ​​the bottom wall 11 of the box body, and the number of the supporting walls 112 can be reasonably selected and designed according to the actual use. As an example, the structural shapes of the multiple supporting walls 112 can be the same. As another example, the structural shapes of at least two of the multiple supporting walls 112 are different. Any two adjacent supporting walls 112 are spaced apart, and the spacing distance between the two adjacent supporting walls 112 can be reasonably selected and designed according to the actual use. Furthermore, the extension directions of the multiple supporting walls 112 can be the same, and at least two of the multiple supporting walls 112 can have different extension directions.

[0112] In the above technical solution, by setting a plurality of support walls 112 and spacing any two adjacent support walls 112, the plurality of support walls 112 are dispersedly arranged, and the plurality of support walls 112 are simultaneously supported between the cavity bottom wall 115 and the cavity top wall 116, which is beneficial to improving the structural strength of the box bottom wall 11, so that the box bottom wall 11 meets the structural strength requirements, and when the box bottom wall 11 is impacted, the plurality of support walls 112 can deform and absorb energy at the same time, which is beneficial to improving the energy absorption performance of the box bottom wall 11, can further reduce the force on the battery cell 20, can further reduce the risk of the box bottom wall 11 deforming and squeezing the battery cell 20, thereby further reducing the risk of deformation and damage of the battery cell 20, and is more beneficial to improving the reliability of the battery device 100.

[0113] According to some embodiments of the present application, a plurality of support walls 112 are arranged along a first direction, and each support wall 112 extends along a second direction, and the first direction, the second direction, and a height direction of the battery device 100 are perpendicular to each other.

[0114] Among them, the first direction and the second direction extend in a plane perpendicular to the height direction of the battery device 100, the first direction may form an angle with both the length direction of the battery device 100 and the width direction of the battery device 100, and the second direction may also form an angle with both the length direction of the battery device 100 and the width direction of the battery device 100. Or the first direction may be parallel to one of the length direction of the battery device 100 and the width direction of the battery device 100, and the second direction may be parallel to the other of the length direction of the battery device 100 and the width direction of the battery device 100. This application takes the first direction being parallel to the length direction of the battery device 100 and the second direction being parallel to the width direction of the battery device 100 as an example for explanation. Further, a plurality of support walls 112 are evenly arranged along the first direction, and the spacing distance between any two adjacent support walls 112 is the same. Each support wall 112 may extend to the cavity side wall 117 of the mounting cavity 111 along the second direction.

[0115] In the above technical solution, by arranging multiple support walls 112 along the first direction and each support wall 112 extending along the second direction, multiple support walls 112 can be arranged at different positions of the bottom wall 11 of the box, which is beneficial to improving the consistency of energy absorption effects at different positions of the bottom wall 11 of the box, and can increase the setting area of ​​the support walls 112, which is beneficial to reducing the number of support walls 112, thereby facilitating the production of the bottom wall 11 of the box and improving the production efficiency of the box.

[0116] According to some embodiments of the present application, the plurality of support walls 112 are parallel to each other.

[0117] The multiple support walls 112 have the same structural shape, and the multiple support walls 112 extend in the same direction. The multiple support walls 112 can extend in the first direction, or the multiple support walls 112 can extend in the second direction, or the multiple support walls 112 can extend in other directions, as long as the extension direction of the support wall 112 is perpendicular to the height direction of the battery device 100. The multiple support walls 112 are parallel to each other, or the multiple support walls 112 are substantially parallel to each other. Figure 3 and Figure 4 As shown, as an example, the plurality of support walls 112 are spaced apart along the first direction, and the plurality of support walls 112 extend along the second direction.

[0118] In the above technical solution, the multiple supporting walls 112 are parallel to each other, which is helpful to simplify the structure of the bottom wall 11 of the box body, facilitate the production of the bottom wall 11 of the box body, thereby helping to improve the production efficiency of the battery device 100, and also helping to improve the structural consistency of different positions of the bottom wall 11 of the box body, and helping to improve the energy absorption consistency of different positions of the bottom wall 11 of the box body.

[0119] According to some embodiments of the present application, the inclination directions of at least two supporting walls 112 are different; and / or the inclination angles of at least two supporting walls 112 are different.

[0120] Wherein, when the inclination directions of at least two supporting walls 112 are different, along the first direction, one supporting wall 112 may be inclined toward the front of the battery device 100, or one supporting wall 112 may be inclined toward the rear of the battery device 100, and along the second direction, one supporting wall 112 may be inclined toward one side of the battery device 100, or one supporting wall 112 may be inclined toward the other side of the battery device 100. When the inclination angles of at least two supporting walls 112 are different, the angles formed by at least two supporting walls 112 and the height direction of the battery device 100 are different, in other words, the angles formed by at least two supporting walls 112 and the cavity bottom wall 115 are different. As an example, the inclination directions of at least two supporting walls 112 are different. As another example, the inclination angles of at least two supporting walls 112 are different. As another example, the inclination directions of at least two supporting walls 112 are different, and the inclination angles of at least two supporting walls 112 are different.

[0121] In the above technical solution, by having at least two support walls 112 with different inclination directions and / or at least two support walls 112 with different inclination angles, the ability of the bottom wall 11 of the box to resist deformation is improved while ensuring that the bottom wall 11 of the box meets the energy absorption performance.

[0122] According to some embodiments of the present application, Figure 5 and Figure 7 As shown, there are multiple battery cells 20 , and the multiple battery cells 20 are all fixed to the cavity top wall 116 . Along the height direction of the battery device 100 , the connection ends 113 of the support wall 112 and the cavity top wall 116 correspond to the corresponding battery cells 20 .

[0123] Among them, the battery cell 20 can be set to multiple, and the number of the multiple battery cells 20 can be reasonably selected and set according to the actual use situation. The multiple battery cells 20 are all fixed to the cavity top wall 116, and the multiple battery cells 20 can be bonded to the cavity top wall 116 by structural adhesive. Along the height direction of the battery device 100, the connection end 113 of the support wall 112 and the cavity top wall 116 is corresponding to the battery cell 20 at the corresponding position, and the orthographic projection of the connection end 113 of the support wall 112 and the cavity top wall 116 and the orthographic projection of the battery cell 20 at the corresponding position have an overlapping area. Each support wall 112 is corresponding to at least one battery cell 20 along the height direction of the battery device 100. In other words, each battery cell 20 is corresponding to at least one support wall 112 along the height direction of the battery device 100.

[0124] In the above technical solution, along the height direction of the battery device 100, the connection ends 113 through the support walls 112 and the cavity top wall 116 are arranged corresponding to the corresponding battery cells 20. When the bottom wall 11 of the box body is impacted, on the basis of satisfying the deformation and energy absorption of the support walls 112, the battery cells 20 can restrain the deformation of the bottom wall 11 of the box body, so that the impact force can be effectively dispersed, which is beneficial to reducing the deformation of the bottom wall 11 of the box body, thereby helping to reduce the risk of the deformation of the cavity top wall 116 aggravating the squeezing of the battery cells 20, thereby further improving the safety of the battery device 100.

[0125] According to some embodiments of the present application, Figure 2 , Figure 3 , Figure 5 and Fig. 9 As shown, a plurality of battery cells 20 form at least one row of battery cell rows 30, each row of battery cell rows 30 includes a plurality of battery cells 20, and the plurality of battery cells 20 in each row of battery cell rows 30 are arranged in sequence along a first direction, and along the height direction of the battery device 100, the connection ends 113 of the support wall 112 and the cavity top wall 116 correspond to the middle areas of the corresponding battery cells 20, and the first direction is perpendicular to the height direction of the battery device 100.

[0126] Among them, multiple battery cells 20 can form one row, two rows, three rows, etc. of battery cell rows 30. The present application takes multiple battery cells 20 forming multiple rows of battery cell rows 30 as an example for explanation. Each row of battery cell rows 30 includes multiple battery cells 20. The multiple battery cells 20 in each row of battery cell rows 30 are arranged in sequence along a first direction. The multiple battery cells 20 in each row of battery cell rows 30 can be arranged in sequence along the thickness direction of the battery cells 20. Multiple rows of battery cell rows 30 can be arranged in sequence along a second direction. The first direction and the second direction extend in a plane perpendicular to the height direction of the battery device 100. The first direction can form an angle with both the length direction of the battery device 100 and the width direction of the battery device 100. The second direction can also form an angle with both the length direction of the battery device 100 and the width direction of the battery device 100. Alternatively, the first direction may be parallel to one of the length direction of the battery device 100 and the width direction of the battery device 100, and the second direction may be parallel to the other of the length direction of the battery device 100 and the width direction of the battery device 100. This application is described by taking the example that the first direction is parallel to the length direction of the battery device 100 and the second direction is parallel to the width direction of the battery device 100.

[0127] Along the height direction of the battery device 100, the connection end 113 of the support wall 112 and the cavity top wall 116 corresponds to the middle area of ​​the corresponding battery cell 20. Along the first direction, the battery cell 20 has a midline extending along the height direction of the battery device 100. The middle area of ​​the battery cell 20 refers to the area covered by a certain distance on both sides of the midline of the battery cell 20 along the first direction. As an example, Figure 5 As shown, along the first direction, the size of the battery cell 20 is L1 (unit: mm), and the size of the middle area of ​​the battery cell 20 is L2 (unit: mm), satisfying the relationship: 0.25 L1≤L2≤0.75L1, and the size of the middle area of ​​the battery cell 20 can be 0.25 L1, 0.3 L1, 0.5 L1, 0.75L1 and other values.

[0128] In the above technical solution, along the height direction of the battery device 100, the connection end 113 of the support wall 112 and the cavity top wall 116 is arranged corresponding to the middle area of ​​the corresponding battery cell 20. When the bottom wall 11 of the box body is impacted, on the basis of satisfying the deformation and energy absorption of the support wall 112, the battery cell 20 can better restrain the deformation of the bottom wall 11 of the box body, and can better effectively disperse the impact force, which is more conducive to reducing the deformation of the bottom wall 11 of the box body, thereby being more conducive to reducing the risk of the deformation of the cavity top wall 116 aggravating the squeezing of the battery cell 20, thereby further improving the safety of the battery device 100. In addition, when the bottom wall 11 of the box body is impacted, the risk of force being transmitted to the edge of the battery cell 20 can be reduced, thereby reducing the risk of the battery cell 20 being ruptured by force, which is conducive to improving the safety of the battery cell 20. At the same time, it is also conducive to the deformation and energy absorption of the support wall 112.

[0129] According to some embodiments of the present application, Figure 2 , Figure 3 , Figure 5 and Fig. 9 As shown, a plurality of battery cells 20 form a plurality of rows of battery cells 30 , which are arranged in sequence along the second direction, and the support wall 112 extends along the second direction. The first direction, the second direction and the height direction of the battery device 100 are perpendicular to each other.

[0130] Among them, Figure 2 and Figure 3 As shown, the number of battery cell rows 30 can be reasonably selected and set according to actual conditions. The battery cell rows 30 can be set to two rows, three rows, four rows, five rows, six rows, etc. Each row of battery cell rows 30 includes a plurality of battery cells 20. The plurality of battery cells 20 in each row of battery cell rows 30 are arranged in sequence along the first direction. The plurality of battery cells 20 in each row of battery cell rows 30 can be arranged in sequence along the thickness direction of the battery cells 20. Multiple rows of battery cell rows 30 can be arranged in sequence along the second direction. The battery cells 20 in any two adjacent rows of battery cell rows 30 are arranged correspondingly along the second direction. There are a plurality of support walls 112, and the plurality of support walls 112 are arranged in sequence along the first direction. The support walls 112 extend along the second direction. Each battery cell 20 is arranged correspondingly to at least one support wall 112 along the height direction of the battery device 100. By extending the support wall 112 along the second direction, each support wall 112 can be arranged corresponding to the battery cells 20 in the multiple rows of battery cells 30 along the height direction of the battery device 100. The battery cells 20 can better restrain the deformation of the bottom wall 11 of the box body, and can better and effectively disperse the impact force, which is more conducive to reducing the deformation of the bottom wall 11 of the box body.

[0131] According to some embodiments of the present application, there are multiple battery cells 20, and the multiple battery cells 20 are all fixed to the cavity top wall 116, and an assembly gap 40 is formed between two adjacent battery cells 20. Along the height direction of the battery device 100, the connection ends 113 of the support wall 112 and the cavity top wall 116 correspond to the corresponding assembly gaps 40.

[0132] Among them, the battery cell 20 can be set to multiple, and the number of the multiple battery cells 20 can be reasonably selected and set according to the actual use situation. The multiple battery cells 20 are all fixed to the cavity top wall 116, and the multiple battery cells 20 can be bonded to the cavity top wall 116 by structural adhesive. Along the height direction of the battery device 100, the connection end 113 of the support wall 112 and the cavity top wall 116 is set corresponding to the assembly gap 40 at the corresponding position, and the orthographic projection of the connection end 113 of the support wall 112 and the cavity top wall 116 is located at the assembly gap 40. Along the height direction of the battery device 100, each assembly gap 40 is set corresponding to at least one support wall 112.

[0133] In the above technical solution, along the height direction of the battery device 100, the connection ends 113 of the support wall 112 and the cavity top wall 116 are arranged corresponding to the corresponding assembly gaps 40. When the bottom wall 11 of the box body is impacted, it is beneficial for the support wall 112 to deform and absorb energy, which is beneficial for reducing the deformation of the bottom wall 11 of the box body, thereby reducing the risk of the cavity top wall 116 deforming and aggravating the squeezing of the battery cell 20, thereby further improving the safety of the battery device 100.

[0134] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, a supporting boss 114 is formed on the inner surface of the cavity top wall 116 and protrudes toward the cavity bottom wall 115 , and the supporting boss 114 is spaced apart from the cavity bottom wall 115 .

[0135] The inner surface of the cavity top wall 116 is formed with a support boss 114 protruding toward the cavity bottom wall 115. The inner surface of the cavity top wall 116 refers to the surface of the cavity top wall 116 facing the cavity bottom wall 115. The support boss 114 can be integrally formed with the cavity top wall 116. Along the height direction of the battery device 100, the end of the support boss 114 away from the cavity top wall 116 is spaced apart from the cavity bottom wall 115. As an example, the support boss 114 is perpendicular to the cavity top wall 116. As another example, the support boss 114 is arranged to extend obliquely along the height direction of the battery device 100.

[0136] In the above technical solution, a supporting boss 114 protruding toward the cavity bottom wall 115 is formed through the inner surface of the cavity top wall 116, and the supporting boss 114 is spaced apart from the cavity bottom wall 115. When the bottom wall 11 of the box body is impacted and the cavity bottom wall 115 is deformed and squeezes the supporting boss 114, the supporting boss 114 can deform and absorb energy, which is beneficial to improving the energy absorption capacity of the bottom wall 11 of the box body, and can further reduce the force on the battery cell 20, and can further reduce the risk of the bottom wall 11 of the box body deforming and squeezing the battery cell 20, thereby further reducing the risk of deformation and damage of the battery cell 20, and is more beneficial to improving the reliability of the battery device 100.

[0137] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, along the height direction of the battery device 100 , the supporting bosses 114 correspond to the corresponding battery cells 20 .

[0138] Among them, the battery cell 20 can be set to multiple, and the number of the multiple battery cells 20 can be reasonably selected and set according to the actual use situation. The multiple battery cells 20 are all fixed to the cavity top wall 116, and the multiple battery cells 20 can be bonded to the cavity top wall 116 by structural adhesive. Along the height direction of the battery device 100, the support boss 114 is correspondingly arranged with the battery cell 20 at the corresponding position, or the connection end 113 of the support boss 114 and the cavity top wall 116 is correspondingly arranged with the battery cell 20 at the corresponding position, and the orthographic projection of the support boss 114 and the orthographic projection of the battery cell 20 at the corresponding position have an overlapping area. Each support boss 114 is correspondingly arranged with at least one battery cell 20 along the height direction of the battery device 100. In other words, each battery cell 20 is correspondingly arranged with at least one support boss 114 along the height direction of the battery device 100.

[0139] In the above technical solution, along the height direction of the battery device 100, the support bosses 114 are arranged corresponding to the corresponding battery cells 20. When the bottom wall 11 of the box body is impacted, on the basis of satisfying the deformation and energy absorption of the support bosses 114, the battery cells 20 can restrain the deformation of the bottom wall 11 of the box body, so that the impact force can be effectively dispersed, which is beneficial to reducing the deformation of the bottom wall 11 of the box body, thereby helping to reduce the risk of the deformation of the cavity top wall 116 aggravating the squeezing of the battery cells 20, thereby further improving the safety of the battery device 100.

[0140] According to some embodiments of the present application, there are multiple battery cells 20 , and the multiple battery cells 20 are all fixed to the cavity top wall 116 , an assembly gap 40 is formed between two adjacent battery cells 20 , and the supporting bosses 114 correspond to the corresponding assembly gaps 40 .

[0141] Among them, the battery cell 20 can be set to multiple, and the number of the multiple battery cells 20 can be reasonably selected and set according to the actual use situation. The multiple battery cells 20 are all fixed to the cavity top wall 116, and the multiple battery cells 20 can be bonded to the cavity top wall 116 by structural adhesive. Along the height direction of the battery device 100, the support boss 114 is set corresponding to the assembly gap 40 at the corresponding position, or the connection end 113 of the support boss 114 and the cavity top wall 116 is set corresponding to the assembly gap 40 at the corresponding position, and the positive projection of the connection end 113 of the support boss 114 and the cavity top wall 116 is located at the assembly gap 40. Along the height direction of the battery device 100, each assembly gap 40 is set corresponding to at least one support boss 114.

[0142] In the above technical solution, along the height direction of the battery device 100, the support boss 114 is arranged corresponding to the corresponding assembly gap 40. When the bottom wall 11 of the box body is hit, it is beneficial for the support boss 114 to deform and absorb energy, which is beneficial to reducing the deformation of the bottom wall 11 of the box body, thereby reducing the risk of deformation of the cavity top wall 116 and aggravating the squeezing of the battery cell 20, thereby further improving the safety of the battery device 100.

[0143] According to some embodiments of the present application, Figure 6 and Figure 8 As shown, the cavity sidewall 117 of the mounting cavity 111 is parallel to the height direction of the battery device 100 .

[0144] The cavity side wall 117 of the installation cavity 111 is connected between the cavity bottom wall 115 and the cavity top wall 116, the cavity side wall 117 is arranged parallel to the height direction of the battery device 100, and the outer surface of the cavity side wall 117 can be a plane, and the outer surface of the cavity side wall 117 is parallel to the height direction of the battery device 100. When the bottom wall of the second box body 10 includes a plurality of box body bottom walls 11, the plurality of box body bottom walls 11 are laid along a plane perpendicular to the height direction of the battery device 100, and the cavity side walls 117 of any two adjacent box body bottom walls 11 are abutted, and the cavity side walls 117 of any two adjacent box body bottom walls 11 are welded and connected.

[0145] In the above technical solution, the cavity side wall 117 of the installation cavity 111 is arranged parallel to the height direction of the battery device 100, so that the two adjacent box bottom walls 11 are easy to assemble, reducing the risk of deformation of the box bottom wall 11 during welding, which is beneficial to improving the connection quality and connection strength between the two adjacent box bottom walls 11.

[0146] According to some embodiments of the present application, Figure 8As shown, along the height direction of the battery device 100, the joints of any two adjacent bottom walls 11 of the box body can be arranged corresponding to the assembly gap 40 at the corresponding position, and a heat exchange plate 60 can be arranged at the assembly gap 40. The heat exchange plate 60 can exchange heat with the battery cell 20, so as to make the temperature of the battery cell 20 suitable.

[0147] According to some embodiments of the present application, the battery device 100 further includes: a protection layer 50 , and the protection layer 50 is disposed on a surface of the cavity bottom wall 115 away from the cavity top wall 116 .

[0148] Among them, along the height direction of the battery device 100, the surface of the cavity bottom wall 115 away from the cavity top wall 116 refers to the lower surface of the cavity bottom wall 115, and the protective layer 50 can be bonded to the surface of the cavity bottom wall 115 away from the cavity top wall 116, and the protective layer 50 can also be installed on the surface of the cavity bottom wall 115 away from the cavity top wall 116 through fasteners. The protective layer 50 can be made of metal, plastic, rubber and other materials. When the protective layer 50 is a metal part, the protective layer 50 can be welded to the surface of the cavity bottom wall 115 away from the cavity top wall 116. The protective layer 50 can include a coating with an energy absorption effect, and the coating can be a polyurea coating, a foamed PVC coating, etc. The protective layer 50 has an energy absorption effect. The protective layer 50 can also include an anti-wear coating to reduce the risk of the bottom wall 11 of the box body being damaged by bottom gravel.

[0149] In the above technical solution, the protective layer 50 is arranged on the surface of the cavity bottom wall 115 away from the cavity top wall 116. When the bottom of the bottom wall 11 of the box body is hit, the protective layer 50 can preferentially absorb the collision energy, and can reduce the collision energy transferred to the bottom wall 11 of the box body and the battery cell 20. The protective layer 50 can protect the bottom wall 11 of the box body, reduce the risk of the bottom wall 11 of the box body being damaged by the bottom gravel, and is beneficial to improving the impact resistance of the bottom wall 11 of the box body.

[0150] According to some embodiments of the present application, Figure 6 and Figure 8 As shown, there are multiple box bottom walls 11 , which are arranged along a plane perpendicular to the height direction of the battery device 100 , and any two adjacent box bottom walls 11 are fixedly connected by the cavity side walls 117 of the mounting cavity 111 .

[0151] The cavity side wall 117 of the installation cavity 111 is connected between the cavity bottom wall 115 and the cavity top wall 116, and the cavity side wall 117 is arranged parallel to the height direction of the battery device 100. The outer surface of the cavity side wall 117 can be a plane, and the outer surface of the cavity side wall 117 is parallel to the height direction of the battery device 100. The bottom wall of the second box body 10 includes a plurality of box body bottom walls 11, and the plurality of box body bottom walls 11 are laid along a plane perpendicular to the height direction of the battery device 100. The cavity side walls 117 of any two adjacent box body bottom walls 11 are abutted, and the cavity side walls 117 of any two adjacent box body bottom walls 11 are welded and connected.

[0152] In the above technical solution, any two adjacent box bottom walls 11 are fixedly connected through the cavity side wall 117 of the installation cavity 111, and the cavity side wall 117 of the installation cavity 111 is arranged parallel to the height direction of the battery device 100, so that the two adjacent box bottom walls 11 are easy to assemble, and the risk of deformation of the box bottom wall 11 during welding is reduced, which is conducive to improving the connection quality and connection strength between the two adjacent box bottom walls 11. In addition, by providing multiple box bottom walls 11, the bottom wall of the second box 10 of the corresponding shape can be assembled, so that the second box 10 meets the use requirements.

[0153] The electric device according to the embodiment of the present application includes the battery device 100 of the above embodiment.

[0154] According to the electrical device of the embodiment of the present application, the installation cavity 111 is defined by the bottom wall 11 of the box body, which is conducive to reducing the weight of the bottom wall 11 of the box body, thereby helping to reduce the weight of the battery device 100, and is conducive to the lightweight design of the battery device 100 and the electrical device. In addition, when the bottom wall 11 of the box body is impacted, the bottom wall 11 of the box body is conducive to deformation and energy absorption, which can reduce the force on the battery cell 20 and reduce the risk of the bottom wall 11 of the box body deforming and squeezing the battery cell 20, thereby reducing the risk of deformation and damage of the battery cell 20, which is conducive to improving the reliability of the battery device 100 and the electrical device.

[0155] By obliquely connecting the support wall 112 between the cavity top wall 116 and the cavity bottom wall 115 of the installation cavity 111, the support wall 112 can reliably support the cavity top wall 116 and the cavity bottom wall 115, so that the box bottom wall 11 has sufficient strength to support the battery cell 20, and when the box bottom wall 11 is impacted, that is, when the cavity bottom wall 115 is impacted, the inclined setting of the support wall 112 is conducive to the deformation and energy absorption of the cavity bottom wall 115 and the support wall 112, which can further reduce the force on the battery cell 20 and the risk of the box bottom wall 11 deforming and squeezing the battery cell 20, thereby further reducing the risk of deformation and damage of the battery cell 20, which is more conducive to improving the reliability of the battery device 100 and the electrical device. In addition, the structure of the box bottom wall 11 is simple, which is conducive to reducing the difficulty of manufacturing the box bottom wall 11, thereby reducing the manufacturing cost of the battery device 100 and the electrical device.

[0156] According to some embodiments of the present application, see Figure 2-Figure 5As shown, the present application provides a battery device 100, including: a box body and a plurality of battery cells 20, wherein the plurality of battery cells 20 are arranged in the box body, the box body has a box body bottom wall 11, along the height direction of the battery device 100, the box body bottom wall 11 is located below the battery cells 20 to support the battery cells 20, the box body bottom wall 11 defines an installation cavity 111, the box body bottom wall 11 has a support wall 112, the support wall 112 is located in the installation cavity 111, and the support wall 112 is obliquely connected between the cavity top wall 116 and the cavity bottom wall 115 of the installation cavity 111. There are a plurality of support walls 112, and the plurality of support walls 112 are arranged in sequence along the first direction, the plurality of support walls 112 are parallel to each other, and each support wall 112 extends along the second direction. The thickness of the support wall 112 is greater than or equal to 1 mm and less than or equal to 3 mm. Multiple battery cells 20 can form multiple rows of battery cell rows 30, and the multiple rows of battery cell rows 30 are arranged along the second direction. The multiple battery cells 20 in each row of battery cell rows 30 are arranged in sequence along the first direction, and the multiple battery cells 20 in each row of battery cell rows 30 can be arranged in sequence along the thickness direction of the battery cells 20.

[0157] Other components of the battery device 100 according to the embodiment of the present application, such as the electrical components and the controller 201 , and operations are known to those skilled in the art and will not be described in detail here.

[0158] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0159] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0160] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box body and a battery cell, wherein the battery cell is arranged in the box body, the box body has a box body bottom wall, and along the height direction of the battery device, the box body bottom wall is located below the battery cell to support the battery cell, the box body bottom wall defines an installation cavity, the box body bottom wall has a support wall, the support wall is located in the installation cavity, and the support wall is obliquely connected between the cavity top wall and the cavity bottom wall of the installation cavity; The cavity side wall of the installation cavity is parallel to the height direction of the battery device.

2. The battery device according to claim 1, characterized in that: An included angle formed by the support wall and the height direction of the battery device is greater than or equal to 15° and less than or equal to 70°.

3. The battery device according to claim 1, characterized in that: At least one of the cavity top wall and the cavity bottom wall is perpendicular to a height direction of the battery device.

4. The battery device according to claim 1, characterized in that: The thickness of the support wall is greater than or equal to 1 mm and less than or equal to 3 mm.

5. The battery device according to claim 1, characterized in that: There are a plurality of support walls, and two adjacent support walls are spaced apart.

6. The battery device according to claim 5, characterized in that: The plurality of support walls are arranged along a first direction, and each of the support walls extends along a second direction. The first direction, the second direction, and a height direction of the battery device are perpendicular to each other.

7. The battery device according to claim 5, characterized in that: The plurality of support walls are parallel to each other.

8. The battery device according to claim 5, characterized in that: At least two of the support walls have different inclination directions; and / or At least two of the support walls have different inclination angles.

9. The battery device according to claim 1, characterized in that: There are a plurality of battery cells, and the plurality of battery cells are all fixedly mounted on the cavity top wall. Along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the corresponding battery cells.

10. The battery device according to claim 9, characterized in that: A plurality of the battery cells form at least one row of battery cells, each row of the battery cells includes a plurality of the battery cells, and the plurality of battery cells in each row of the battery cells are arranged in sequence along a first direction, and along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the middle areas of the corresponding battery cells, and the first direction is perpendicular to the height direction of the battery device.

11. The battery device according to claim 1, characterized in that: There are multiple battery cells, which are all fixed to the cavity top wall, forming an assembly gap between two adjacent battery cells, and along the height direction of the battery device, the connection ends of the support wall and the cavity top wall correspond to the corresponding assembly gaps.

12. The battery device according to claim 1, characterized in that: A supporting boss protruding toward the cavity bottom wall is formed on the inner surface of the cavity top wall, and the supporting boss is spaced apart from the cavity bottom wall.

13. The battery device according to claim 12, characterized in that: Along the height direction of the battery device, the supporting bosses correspond to the corresponding battery cells.

14. The battery device according to claim 12, characterized in that: There are a plurality of battery cells, and the plurality of battery cells are fixedly mounted on the top wall of the cavity. An assembly gap is formed between two adjacent battery cells, and the supporting bosses correspond to the corresponding assembly gaps.

15. The battery device according to any one of claims 1 to 14, characterized in that: Also includes: A protective layer is provided on a surface of the cavity bottom wall away from the cavity top wall.

16. The battery device according to any one of claims 1 to 14, characterized in that: There are multiple bottom walls of the box body, and the multiple bottom walls of the box body are arranged along a plane perpendicular to the height direction of the battery device, and any two adjacent bottom walls of the box body are fixedly connected through the cavity side walls of the installation cavity.

17. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1-16.

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