Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and relates to the technical field of batteries, the battery device comprises a battery monomer and a box body, the box body comprises a box body and a beam body, the box body is provided with a containing cavity, the containing cavity is used for containing the battery monomer, the beam body is installed in the containing cavity, and the beam body is used for containing the battery monomer. The box body comprises a bottom plate and a plurality of side plates which surround the periphery of the bottom plate and are sequentially connected end to end, and the beam body is connected with the bottom plate through a mortise and tenon joint structure. According to the battery device provided by the invention, the bottom plate of the box body is connected with the beam body through the mortise and tenon joint structure, so that the bottom plate and the beam body have better connection strength, and when the battery monomers expand, the expansive force borne by the beam body can be better transferred to the bottom plate, so that the expansive force can be better decomposed and transferred; the expansion resistance of the box body can be improved, so that the reliability and the stability of the battery device are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, the battery device plays an irreplaceable important role as the power source of electric vehicles. Among them, the battery device as the core part of new energy vehicles has higher requirements in terms of energy density and reliability. However, with the increase of battery energy density, the change of active substances in the battery leads to the increase of the expansion force of the battery cell. In the related technology, the battery pack is usually connected by welding or screwing between the expansion beam and the box body, which is easy to cause stress concentration between the expansion beam and the box body, and thus may affect the safety and overall performance of the battery pack. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery device and a power utilization device comprising the battery device. The bottom plate and the beam body of the box body are connected through a mortise and tenon structure, which can improve the anti-expansion ability of the box body and thus improve the reliability and stability of the battery device.

[0004] In the first aspect, the embodiments of the present application provide a battery device. The battery device comprises a battery monomer and a box body. The box body comprises a box body and a beam body. The box body has a receiving cavity for accommodating the battery monomer. The beam body is installed in the receiving cavity. The box body comprises a bottom plate and a plurality of side plates which are connected in sequence around the periphery of the bottom plate. The beam body is connected to the bottom plate through a mortise and tenon structure.

[0005] In the above technical manner, the bottom plate and the beam body of the box body are connected through a mortise and tenon structure, so that the bottom plate and the beam body have good connection strength. When the battery monomer expands, the expansion force borne by the beam body can be well transmitted to the bottom plate, so that the expansion force can be well decomposed and transmitted. The anti-expansion ability of the box body can be improved, and thus the reliability and stability of the battery device can be improved.

[0006] In some embodiments, the plurality of side plates are all profile frames, and at least one end of the beam body is connected to the side plate through the mortise and tenon structure.

[0007] In the above technical manner, the side plate is a profile frame, which can have good structural strength and is not easy to be damaged. Therefore, it can well resist the expansion force transmitted from the beam body, has high reliability and good stability, and can well decompose the expansion force formed by the battery monomer, so that the battery device has good reliability and stability.

[0008] In some embodiments, the bottom plate has a heat exchange channel.

[0009] In the above technical manner, the heat exchange manner of the application is to perform heat exchange at the bottom of the battery device, and the heat exchange plate in the application can be directly configured as a bottom plate to carry the battery monomer. In the related art, the bottom plate and the heat exchange plate are often separately arranged. In the application, one plate is equivalent to being reduced, and the battery device can be thinned.

[0010] In some embodiments, the bottom plate includes a water-cooled plate and a reinforcing beam, the water-cooled plate has a heat exchange channel, and the two ends of the reinforcing beam are connected with the two side plates respectively, wherein the beam body and the water-cooled plate are connected through the mortise and tenon structure, and / or the water-cooled plate is provided with a avoiding hole, and the mortise and tenon structure passes through the avoiding hole to connect the beam body and the reinforcing beam.

[0011] In the above technical manner, the connection between the beam body, the water-cooled plate and the reinforcing beam can be arranged according to actual needs. When the battery monomer forms an expansion force, the beam body can better decompose the acting force towards the water-cooled plate and the reinforcing beam, so as to better reduce the damage of the expansion force of the battery monomer to the box body.

[0012] In some embodiments, the box body is an integrated stamping part.

[0013] In the above technical manner, the box body formed by stamping has good structural consistency. After the beam body is connected with the box wall through the mortise and tenon structure, the beam body can better transmit the expansion force to the box wall, and then to the entire box body, which is beneficial to the decomposition of the expansion force. At the same time, the mortise and tenon structure can better reduce the stress concentration between the beam body and the box wall, and can better improve the reliability and stability of the box body.

[0014] In some embodiments, the mortise and tenon structure includes a tenon and a mortise hole, the tenon is arranged on one of the bottom plate and the beam body, and the mortise hole is arranged on the other one of the bottom plate and the beam body.

[0015] In the above technical manner, the concave-convex engagement structure formed between the bottom plate and the beam body can better improve the connection stability between the bottom plate and the beam body, can reduce the risk of loosening between the bottom plate and the beam body in long-term charge and discharge cycles, and can better improve the overall anti-deformation capability and service life of the box body, so as to better provide a continuous and stable working environment for the battery monomer, and then improve the reliability and stability of the battery device.

[0016] In some embodiments, the beam body extends along a first direction, and in the first direction, the end of the beam body is configured as the tenon, and the side plate is formed with a recess configured as the mortise, and the end of the beam body is completely accommodated in the recess.

[0017] In the above technical manner, the end of the beam body can be completely accommodated in the recess, without the need for special structural changes to the end of the beam body, which can reduce the processing difficulty of the beam body, and the end of the beam body is completely accommodated in the recess, which can better decompose the concentrated expansion force into compressive stress along the depth direction of the recess and shear stress along the circumferential direction of the hole wall, which can better reduce the stress concentration between the end of the beam body and the side plate, and can make the force more evenly distributed in the recess, which can better reduce the risk of loosening between the side plate and the beam body in long-term charge and discharge cycles.

[0018] In some embodiments, the beam body extends along a first direction, and in a second direction, the side wall of the beam body is formed with a protruding rib or a groove extending along the first direction, and in the second direction, the size H of the protruding rib or the groove satisfies: 0.5mm≤H≤5mm, and the first direction and the second direction are perpendicular to each other.

[0019] In the above technical manner, by making the protruding rib or the groove satisfy the above size, the connection strength between the beam body and the box body can be better improved, thereby better improving the reliability and stability of the box.

[0020] In some embodiments, the beam body is an expansion beam, and the expansion beam is arranged on the side of the battery monomer, and the expansion beam is adapted to expand or contract.

[0021] In the above technical manner, when the battery monomer is charged and discharged to expand, the expansion beam can contract to absorb part of the expansion force, avoiding sudden increase of stress in the hard rigid structure to damage the battery monomer or the beam body; when the monomer contracts, the expansion beam can restore to maintain stable support, which can reduce the wear caused by the shaking of the battery monomer. After the expansion beam buffers the expansion force, the expansion beam can also disperse and transmit the remaining expansion force to the box body through the mortise and tenon structure, which can reduce the stress concentration between the beam body and the box body, and is conducive to improving the reliability and stability of the box.

[0022] In some embodiments, the beam body and the box body have a welding area to weld and connect the beam body and the box body, and / or the beam body and the box body each have a bolt hole to bolt and connect the beam body and the box body.

[0023] In the above technical manner, the beam body and the box body are connected through the mortise and tenon structure in combination with welding or bolt connection, which can further improve the reliability of the connection between the beam body and the box body, thereby being conducive to improving the reliability and stability of the box.

[0024] In a second aspect, embodiments of the present application provide a power consuming device, comprising the battery device according to the first aspect of the present application.

[0025] In the above technical manner, the battery device can provide power for the power consuming device, and by having the battery device with better reliability and stability, the power consuming device can have better reliability and stability.

[0026] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0028] Figure 1 is a schematic view of a vehicle according to an embodiment of the present application.

[0029] Figure 2 is a structural schematic view of one angle of a box according to an embodiment of the present application.

[0030] Figure 3 is a structural schematic view of another angle of a box according to an embodiment of the present application.

[0031] Figure 4 is a structural schematic view of a box according to an embodiment of the present application. Figure 3 is a sectional view along line A-A in FIG. 1.

[0032] Figure 5 is a structural schematic view of a box according to an embodiment of the present application. Figure 4 is an enlarged view of region C in FIG. 1.

[0033] Figure 6 is a structural schematic view of a box according to an embodiment of the present application.

[0034] Figure 7 is a structural schematic view of a box according to an embodiment of the present application. Figure 2 is an enlarged view of region A in FIG. 1.

[0035] REFERENCE SIGNS:

[0036] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0037] 2, box; 21, box body; 211, bottom plate; 212, side plate; 22, beam body;

[0038] 31, water-cooling plate; 32, reinforcing beam;

[0039] 41, recess; 42, groove;

[0040] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0041] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0044] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can 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 all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. The skilled person explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0046] In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include one or more battery cells, and when there are multiple, the multiple battery cells are connected in series, parallel or mixed connection through bus components.

[0050] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0051] In some embodiments, the battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0052] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0053] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0054] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that the inside of the box forms a closed space to accommodate the battery monomer assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0055] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that the inside of the box forms a closed space to accommodate the battery monomer assembly.

[0056] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0057] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0058] The battery monomer mentioned in the embodiments of the present application can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto.

[0059] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0060] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, the battery device plays an irreplaceable important role as the power source of the electric vehicle. Among them, the battery device as a core part of new energy vehicles has higher requirements in terms of energy density and reliability. However, with the increase of battery energy density, the change of active substances in the battery leads to the corresponding increase of the expansion force of the battery cell. In the related technology, the battery pack is usually connected by welding or screwing between the expansion beam and the box, which is easy to cause stress concentration at the connection between the expansion beam and the box, and thus may affect the safety and overall performance of the battery pack.

[0061] Based on the above considerations, in order to improve the reliability and stability of the battery device, the applicant designs a battery device after in-depth research. In the box body of the battery device, the box body and the beam body are connected through the mortise and tenon structure, so that the box body and the beam body have good connection strength. When the battery monomer expands, the expansion force borne by the beam body can be well transmitted to the box body, so that the expansion force can be well decomposed and transmitted, which can improve the anti-expansion ability of the box body, thereby improving the reliability and stability of the battery device.

[0062] The embodiments of the present application provide a power consumption device using the battery device of the present application as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] The following embodiments take the vehicle 1000 as an example for the convenience of description, and introduce the structure of the power consumption device, the battery device 100 and the battery monomer in detail.

[0064] Please refer to Figure 1 , Figure 1 The vehicle 1000 structure schematic diagram provided by some embodiments of the present application. The vehicle 1000 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle 1000 is provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving. In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0065] The following refers to Figures 2-7 The battery device 100 according to the first aspect of the present application is described.

[0066] Please refer to Figures 2-5 , Figure 2 is a structure schematic diagram of one angle of the box body 2 according to the embodiments of the present application. Figure 3This is a structural schematic diagram of the housing 2 from another angle according to an embodiment of this application. Figure 4 yes Figure 3 A cross-sectional view along line AA. Figure 5 yes Figure 4 A magnified view of region C in the middle.

[0067] This application provides a battery device 100, such as... Figures 2-5 As shown, the battery device 100 includes a battery cell and a housing 2. The housing 2 includes a housing body 21 and a beam 22. The housing body 21 has a receiving cavity for receiving the battery cell. The beam 22 is installed in the receiving cavity. The housing body 21 includes a bottom plate 211 and a plurality of side plates 212 surrounding the bottom plate 211 and connected end to end. The beam 22 is connected to the bottom plate 211 by a tenon and mortise structure.

[0068] In other words, the battery cells can be placed inside the housing 21, which effectively protects them and reduces damage. The beam 22 is installed within the housing, effectively dividing it into a first area for housing the battery cells and a second area for housing the electronic control components. For example, multiple battery cells can be arranged to form a battery cell assembly. When the battery cells expand during charge / discharge cycles, the expansion force generated by the battery cells acts on the beam 22. The beam 22 and the base plate 211... The mortise and tenon structure connects the beam 22 and the base plate 211, creating multiple contact surfaces in various directions. This ensures a reliable connection between the beam 22 and the base plate 211, allowing for better transmission of expansion force from the beam 22 to the base plate 211. Furthermore, the multiple contact surfaces also help to decompose the expansion force during transmission, reducing its concentration at the connection point. This results in better reliability and stability for the housing 2, providing a more stable cavity for the battery cells.

[0069] In addition, the base plate 211 and the beam 22 of this application are connected by a mortise and tenon structure, which can reduce the use of connecting parts, thereby reducing the assembly difficulty and improving the assembly efficiency. Moreover, the mortise and tenon structure can be an interference fit connection structure, which can better improve the compactness of the connection.

[0070] In the above-mentioned technical method, the bottom plate 211 of the housing 2 is connected to the beam 22 by a mortise and tenon structure, which makes the connection between the bottom plate 211 and the beam 22 have good strength. When the battery cell expands, the expansion force borne by the beam 22 can be well transferred to the bottom plate 211, thereby effectively decomposing and transferring the expansion force, which can improve the expansion resistance of the housing 2, thereby improving the reliability and stability of the battery device 100.

[0071] Please refer to Figure 7 , Figure 7 is Figure 2 is an enlarged view of the A area in FIG. 1.

[0072] In some embodiments of the present application, as shown in Figure 2 , Figure 7 The plurality of side plates 212 are profiled frames, and at least one end of the beam body 22 is connected to the side plate 212 through a mortise and tenon structure.

[0073] For example, the beam body 22 extends in the first direction X, and both ends of the beam body 22 can be connected to the side plate 212 through a mortise and tenon structure. On one side of the beam body 22 in the second direction Y, the beam body 22 can be connected to the bottom plate 211. In some free areas between the beam body 22 and the box body 21, the beam body 22 can be connected through riveting, screwing or welding.

[0074] In the above technical manner, the side plate 212 is a profiled frame, which can make the side plate 212 have good structural strength and not be easily damaged. Therefore, the side plate 212 can better resist the expansion force transmitted from the beam body 22, has high reliability and good stability, and can better decompose the expansion force formed by the battery monomer, so that the battery device 100 has good reliability and stability.

[0075] In some embodiments of the present application, the bottom plate 211 has a heat exchange channel.

[0076] For example, the bottom plate 211 has a first area and a second area. The heat exchange channel can be arranged in the first area, and the beam body 22 can be connected to the second area through a mortise and tenon structure.

[0077] In the above technical manner, the heat exchange manner of the present application is to exchange heat at the bottom of the battery device 100. In the present application, the heat exchange plate can be directly configured as the bottom plate 211 to bear the battery monomer. In the related art, the bottom plate 211 and the heat exchange plate are often separately arranged. In the present application, one plate is equivalent to being reduced, and the battery device 100 can be thinned.

[0078] Please refer to Figure 6 , Figure 6 is a structure schematic view of the reinforcing beam 32 of the box body 2 and the mortise and tenon connection of the expansion beam according to the embodiments of the present application.

[0079] In some embodiments of the present application, as shown in Figure 2 , Figures 3-6As shown, the bottom plate 211 includes a water-cooled plate 31 having heat exchange channels inside and a reinforcing beam 32, two ends of the reinforcing beam 32 are connected with two side plates 212 respectively, wherein the beam body 22 is connected with the water-cooled plate 31 through a mortise and tenon structure, and / or the water-cooled plate 31 is provided with a relief hole, and the mortise and tenon structure passes through the relief hole to connect the beam body 22 and the reinforcing beam 32.

[0080] Exemplarily, for the connection between the bottom plate 211 and the beam body 22, only the beam body 22 and the water-cooled plate 31 can be connected through the mortise and tenon structure, and the reinforcing beam 32 can play a role in improving the structural strength of the water-cooled plate 31. For example, the thickness of the water-cooled plate 31 is relatively thin, and the water-cooled plate 31 needs to bear the battery monomer as a bearing structure of the bottom of the battery device 100. By increasing the reinforcing beam 32, the structural strength of the battery monomer can be improved, thereby better bearing the battery monomer. Optionally, the reinforcing beam 32 can be provided with a plurality of reinforcing beams 32, which can be arranged in a spaced apart manner or in a staggered manner, and the present application does not limit this.

[0081] Exemplarily, for the connection between the bottom plate 211 and the beam body 22, only the beam body 22 and the reinforcing beam 32 can be connected through the mortise and tenon structure. Understandably, the beam body 22 and the reinforcing beam 32 can have good structural strength, and the tenon or mortise can be better constructed on the beam body 22 and the reinforcing beam 32, thereby reducing the processing difficulty.

[0082] Exemplarily, for the connection between the bottom plate 211 and the beam body 22, the beam body 22 and the water-cooled plate 31 can be connected through the mortise and tenon structure, and the beam body 22 and the reinforcing beam 32 can also be connected through the mortise and tenon structure. Therefore, the connection between the beam body 22, the water-cooled plate 31 and the reinforcing beam 32 can be better established, so that the beam body 22, the water-cooled plate 31 and the reinforcing beam 32 are better constructed as a whole. When the battery monomer forms an expansion force, the beam body 22 can better decompose the force towards the water-cooled plate 31 and the reinforcing beam 32, thereby better reducing the damage of the expansion force of the battery monomer to the box body 2.

[0083] In the above technical manner, the connection between the beam body 22, the water-cooled plate 31 and the reinforcing beam 32 can be set according to actual needs. When the battery monomer forms an expansion force, the beam body 22 can better decompose the force towards the water-cooled plate 31 and the reinforcing beam 32, thereby better reducing the damage of the expansion force of the battery monomer to the box body 2.

[0084] In some embodiments of the present application, the box body 21 is an integrated stamping part, and the box body 21 includes a plurality of box walls, at least one of the plurality of box walls being connected with the beam body 22 through a mortise and tenon structure.

[0085] In the above technical manner, the box body 21 formed by stamping has good structural consistency. After the beam body 22 is connected to the box wall through the mortise and tenon structure, the beam body 22 can well transmit the expansion force to the box wall, and then to the entire box body 21, which is beneficial to the decomposition of the expansion force. Meanwhile, the mortise and tenon structure can well reduce the stress concentration between the beam body 22 and the box wall, and can well improve the reliability and stability of the box body 2.

[0086] In some embodiments of the present application, the mortise and tenon structure includes a tenon and a mortise hole. The tenon is arranged on one of the bottom plate 211 and the beam body 22, and the mortise hole is arranged on the other one of the bottom plate 211 and the beam body 22.

[0087] For example, the tenon can be arranged on the bottom plate 211, and the mortise hole can be arranged on the beam body 22. The concave-convex engagement structure can be formed between the bottom plate 211 and the beam body 22. When the battery monomer forms the expansion force, the expansion force can first act on the box wall or the beam body 22, and then be decomposed into compressive stress along the inner walls of the mortise hole through the multiple directional contact surfaces of the tenon and the mortise hole. The risk of local damage caused by the acting force can be well reduced, thereby effectively improving the reliability of the box body 2.

[0088] Compared with the bolt connection in the related art, the matching of the tenon and the mortise hole can well reduce the connection gap between the beam body 22 and the bottom plate 211, which can be beneficial to the uniform decomposition of the expansion force between the beam body 22 and the bottom plate 211. Meanwhile, the one-to-one embedded structure, in combination with the structural characteristics of the integral stamping of the box body 21, can well improve the connection stability between the box body 21 and the beam body 22, can reduce the risk of loosening between the box body 21 and the beam body 22 in long-term charge-discharge cycles, thereby well improving the overall anti-deformation capability and service life of the box body 2, can well provide a continuous and stable working environment for the battery monomer, and further improves the reliability and stability of the battery device 100.

[0089] In the above technical manner, the concave-convex engagement structure formed between the bottom plate 211 and the beam body 22 can well improve the connection stability between the bottom plate 211 and the beam body 22, can reduce the risk of loosening between the bottom plate 211 and the beam body 22 in long-term charge-discharge cycles, thereby well improving the overall anti-deformation capability and service life of the box body 2, can well provide a continuous and stable working environment for the battery monomer, and further improves the reliability and stability of the battery device 100.

[0090] In some embodiments of the present application, the beam body 22 extends along the first direction X. In the first direction X, the end of the beam body 22 is configured as a tenon, the side plate 212 is formed with a recess 41, the recess 41 is configured as a mortise hole, and the end of the beam body 22 is completely accommodated in the recess 41.

[0091] Exemplarily, in the third direction Z, the beam body 22 is arranged at one side of the battery monomer, the battery monomer can expand along the third direction Z, thereby, when the beam body 22 bears the expansion force from the third direction Z, the end of the beam body 22 is completely accommodated in the recess 41, the concentrated expansion force can be better decomposed into the compressive stress along the depth direction of the recess 41 and the shear stress along the circumferential direction of the hole wall, the stress concentration between the end of the beam body 22 and the side plate 212 can be better reduced, and the acting force can be more uniformly distributed in the recess 41, and the risk of loosening between the box body 21 and the beam body 22 in the long-term charge and discharge cycle can be better reduced.

[0092] In addition, since the end of the beam body 22 can be completely accommodated in the recess 41, the end of the beam body 22 does not need to be specially changed in structure, and the processing difficulty of the beam body 22 can be reduced.

[0093] In the above technical manner, the end of the beam body 22 can be completely accommodated in the recess 41, the end of the beam body 22 does not need to be specially changed in structure, the processing difficulty of the beam body 22 can be reduced, and the end of the beam body 22 is completely accommodated in the recess 41, the concentrated expansion force can be better decomposed into the compressive stress along the depth direction of the recess 41 and the shear stress along the circumferential direction of the hole wall, the stress concentration between the end of the beam body 22 and the side plate 212 can be better reduced, and the acting force can be more uniformly distributed in the recess 41, and the risk of loosening between the box body 21 and the beam body 22 in the long-term charge and discharge cycle can be better reduced.

[0094] In some embodiments of the present application, the beam body 22 extends along the first direction X, and in the second direction Y, the side wall of the beam body 22 is formed with a convex rib or a groove 42 extending along the first direction X, and in the second direction Y, the size H of the convex rib or the groove 42 satisfies: 0.5mm≤H≤5mm, and the first direction X and the second direction Y are perpendicular to each other.

[0095] Exemplarily, the size H of the convex rib or the groove 42 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm.

[0096] That is, the structure of the convex ribs and the grooves 42 is simple, which can reduce the processing difficulty. For example, the beam body 22 can be an integral molding, and the convex ribs or the grooves 42 can be directly constructed during the integral molding. The box body 21 can be correspondingly constructed with the grooves 42 matched with the convex ribs, and the convex ribs matched with the grooves 42. In addition, by making the convex ribs or the grooves 42 meet the above-mentioned size, the connection strength between the beam body 22 and the box body 21 can be improved. It can be understood that, if the size of the convex ribs or the grooves 42 is less than 0.5 mm, the convex ribs or the grooves 42 of the beam body 22 are prone to be separated from the box body 21 under the action of the expansion force. If the size of the convex ribs or the grooves 42 is greater than 5 mm, the structural strength of the beam body 22 or the box body 21 is prone to be affected, and the beam body 22 or the box body 21 is prone to be damaged.

[0097] Exemplarily, the convex ribs or the grooves 42 on the beam body 22 can be provided in plurality, and the plurality of convex ribs or the plurality of grooves 42 are arranged at intervals.

[0098] Exemplarily, the beam body 22 can simultaneously have the convex ribs and the grooves 42.

[0099] In the above technical manner, by making the convex ribs or the grooves 42 meet the above-mentioned size, the connection strength between the beam body 22 and the box body 21 can be improved, so that the reliability and stability of the box body 2 can be improved.

[0100] In some embodiments of the present application, the beam body 22 is an expansion beam, which is arranged on the side of the battery monomer and is adapted to expand or contract.

[0101] In the above technical manner, when the battery monomer is charged or discharged and expands, the expansion beam can contract to absorb part of the expansion force, so as to avoid the damage of the battery monomer or the beam body 22 caused by the sudden increase of the stress of the hard rigid structure. When the monomer contracts, the expansion beam can restore to maintain stable support, so as to reduce the abrasion of the battery monomer caused by the shaking. After the expansion beam buffers the expansion force, the expansion beam can also disperse and transmit the remaining expansion force to the box body 21 through the mortise and tenon structure, so as to reduce the stress concentration between the beam body 22 and the box body 21, which is beneficial to improve the reliability and stability of the box body 2.

[0102] In some embodiments of the present application, the beam body 22 and the box body 21 have a welding area, so as to be welded and connected. In addition, the beam body 22 and the box body 21 can each have a bolt hole, so as to be bolted and connected.

[0103] That is, the beam body 22 and the box body 21 can be connected not only through the mortise and tenon structure, but also through welding and bolt connection, so that the connection between the beam body 22 and the box body 21 is more firm and reliable.

[0104] Exemplarily, the beam body 22 and the box body 21 can be connected through welding and mortise and tenon structure.

[0105] Exemplarily, the beam body 22 and the box body 21 can be connected through bolt connection and mortise and tenon structure.

[0106] Exemplarily, the beam body 22 and the box body 21 can be connected through welding, bolt connection and mortise and tenon structure.

[0107] In the above technical manner, the beam body 22 and the box body 21 are connected through the mortise and tenon structure in combination with the welding or bolt connection, which can further improve the reliability of the connection between the beam body 22 and the box body 21, thereby facilitating to improve the reliability and stability of the box body 2.

[0108] The embodiment of the present application provides a power utilization device with the battery device 100.

[0109] In some embodiments of the present application, the power utilization device comprises the battery device 100, and the battery device 100 can provide power for the power utilization device. Through the battery device 100 with good reliability and stability, the power utilization device can have good reliability and stability.

[0110] The other configurations and operations of the battery device 100 and the power utilization device according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0111] In the description of the present application, the description of the terms “some embodiments”, “optionally”, “further”, “some examples” and the like means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: Battery cell; The box body (2) includes a box body (21) and a beam (22). The box body (21) has a receiving cavity for accommodating individual battery cells. The beam (22) is installed in the receiving cavity. The box body (21) includes a bottom plate (211) and a plurality of side plates (212) arranged around the bottom plate (211) and connected end to end. The beam (22) is connected to the bottom plate (211) by a tenon and mortise structure.

2. The battery device according to claim 1, characterized in that, The multiple side panels (212) are all profile frames, and at least one end of the beam (22) is connected to the side panel (212) through the mortise and tenon structure.

3. The battery device according to claim 1, characterized in that, The base plate (211) has heat exchange channels.

4. The battery device according to claim 3, characterized in that, The base plate (211) includes a water-cooled plate (31) and a reinforcing beam (32). The water-cooled plate (31) has heat exchange channels inside. The two ends of the reinforcing beam (32) are respectively connected to the two side plates (212). The beam (22) and the water-cooled plate (31) are connected by the mortise and tenon structure, and / or, The water-cooled plate (31) is provided with a clearance hole, and the tenon structure passes through the clearance hole to connect the beam (22) and the reinforcing beam (32).

5. The battery device according to claim 1, characterized in that, The box body (21) is an integral stamped part.

6. The battery device according to claim 1, characterized in that, The mortise and tenon structure includes a tenon and a mortise, the tenon being disposed on one of the base plate (211) and the beam (22), and the mortise being disposed on the other of the base plate (211) and the beam (22).

7. The battery device according to claim 6, characterized in that, The beam (22) extends along a first direction (X), and in the first direction (X), the end of the beam (22) is constructed as the tenon, the side plate (212) is formed with a recess (41), the recess (41) is constructed as the mortise, and the end of the beam (22) is completely accommodated in the recess (41).

8. The battery device according to claim 6, characterized in that, The beam (22) extends along a first direction (X) and in a second direction (Y), the sidewall of the beam (22) is formed with a protruding rib or a groove (42) extending along the first direction (X). Along the second direction (Y), the size H of the protruding rib or the groove (42) satisfies: 0.5mm≤H≤5mm, and the first direction (X) and the second direction (Y) are perpendicular to each other.

9. The battery device according to claim 1, characterized in that, The beam (22) is an expansion beam, which is disposed on the side of the battery cell and is adapted to expand or contract.

10. The battery device according to claim 1, characterized in that, The beam (22) and the box body (21) have a welding area to weld the beam (22) and the box body (21) together, and / or the beam (22) and the box body (21) both have bolt holes to bolt the beam (22) and the box body (21) together.

11. An electrical appliance, characterized in that, The battery device includes any one of claims 1-10.

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