Battery device and electric device

Abstract

Expansion beams of the battery device are arranged in a box body at intervals in the first direction, a partition plate extends in the first direction and is arranged in a containing space, the two ends of the partition plate are fixedly connected with the expansion beams, and the partition plate is provided with a first end and a second end in the first direction; the first expansion beam is provided with a first groove, and the first groove is in insertion fit with the first end part; a second groove is formed in the second expansion beam, and the second groove is matched with the second end part in an inserting manner; in the direction close to the first expansion beam in the first direction, the maximum size of the first end part in the second direction is gradually increased, and in the direction close to the second expansion beam in the first direction, the maximum size of the second end part in the second direction is gradually increased; the second direction is perpendicular to the first direction. The expansion resistance of the expansion beam of the battery device can be improved, so that the expansion resistance of the battery device is improved, the expansion force in the battery device is stabilized under various working conditions, and the stability of the battery device is improved.

Description

Technical Field

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

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field and so on.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power wholly or partly. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side. With the continuous increase in the demand for batteries, the industry's requirements for the anti-expansion ability of battery devices are also constantly improving. Therefore, how to improve the anti-expansion ability of battery devices is one of the research topics in the industry. Utility Model Content

[0004] To solve the above technical problems, this application provides a battery device and an electrical device.

[0005] This application is implemented through the following technical solutions.

[0006] In a first aspect of an embodiment of this application, a battery device is provided, including a box body, at least two expansion beams, at least one partition board, and at least one battery monomer group. The expansion beams are arranged in the box body at intervals along a first direction, and define an accommodation space with the box body. The accommodation space accommodates the battery monomer group. The battery monomer group includes a plurality of battery monomers arranged along the first direction. The partition board extends along the first direction. The partition board is arranged in the accommodation space and both ends of the partition board are fixedly connected to the expansion beams, dividing the accommodation space into a plurality of sub-spaces. Each of the sub-spaces accommodates the battery monomer group; the battery device includes a first expansion beam and a second expansion beam. Along the first direction, the partition board has a first end and a second end. The first expansion beam is provided with a first groove, and the first groove is in plug-in fit with the first end; the second expansion beam is provided with a second groove, and the second groove is in plug-in fit with the second end; along the direction close to the first expansion beam along the first direction, the maximum dimension of the first end along a second direction gradually increases, and / or, along the direction close to the second expansion beam along the first direction, the maximum dimension of the second end along the second direction gradually increases; the second direction is perpendicular to the first direction.

[0007] Since the partition plate extends in the first direction and is fixedly connected to the expansion beam at both ends, the support structure formed after the partition plate is fixedly connected to the expansion beam can disperse the mechanical stress generated by the expansion of the battery cell, enabling the expansion beam to have good load-bearing capacity in the first direction, providing a buffering effect on the battery cell and an inward pressure, enhancing the anti-expansion ability of the battery device, and preventing the excessive expansion amount and deformation amount of the battery cell. Additionally, the partition plate can also enhance the bending resistance of the expansion beam, making the force on the expansion beam more uniform, reducing the risk of bending and breakage due to stress concentration, stabilizing the expansion force within the battery device under various working conditions, and improving the stability of the battery device. Moreover, the plug-in connection is convenient and reliable, which can simplify the assembly process and improve the assembly efficiency. The end of the partition plate and the expansion beam are in plug-in fit, and the mating surface is inclined at an angle to the first direction, which can increase the friction force of the plug-in fit part and reduce the risk of the partition plate loosening or sliding after being subjected to external vibration and impact. The size of the end gradually increases in the second direction, further reducing the risk of the partition plate loosening or sliding, and enhancing the stability of the battery device and the anti-expansion ability of the expansion beam.

[0008] In some embodiments, the battery cell has a plurality of wall surfaces, and the side wall surface with the largest area among the plurality of wall surfaces is perpendicular to the first direction.

[0009] Thereby, the expansion beam can better resist the expansion of the battery cell in the first direction during the cycling process, reducing the risk of deformation and rupture after expansion.

[0010] In some embodiments, the relative two sides of the first end in the second direction have a first side surface and a second side surface, the first side surface and the second side surface are arc-shaped surfaces, the first side surface protrudes towards the side where the second side surface is located in the second direction, the second side surface protrudes towards the side where the first side surface is located in the second direction, and / or the relative two sides of the second end in the second direction have a third side surface and a fourth side surface, the third side surface and the fourth side surface are arc-shaped surfaces, the third side surface protrudes towards the side where the fourth side surface is located in the second direction, and the fourth side surface protrudes towards the side where the third side surface is located in the second direction.

[0011] Since the shape of the mating surface between the partition plate and the expansion beam is arc-shaped, it can reduce the stress concentration at the end of the partition plate, lower the risk of breakage or tearing in the groove, and can also improve the stress-bearing performance of the partition plate and enhance the tensile strength.

[0012] In some embodiments, the first end is provided with a first welding portion, and the first welding portion is welded to the inner surface of the first groove, and / or the second end is provided with a second welding portion, and the second welding portion is welded to the inner surface of the second groove.

[0013] Thus, welding can further enhance the bonding strength of the insertion fit portion between the partition plate and the expansion beam, improving the stability of the battery device.

[0014] In some embodiments, the expansion beam extends along the second direction, and a plurality of the partition plates are arranged along the second direction.

[0015] Thus, the bending resistance and expansion resistance of the expansion beam can be further improved.

[0016] In some embodiments, the depth dimension of the first groove along the gravity direction is 50% to 80% of the dimension of the first expansion beam along the gravity direction; and / or, the depth dimension of the second groove along the gravity direction is 50% to 80% of the dimension of the second expansion beam along the gravity direction; the gravity direction, the first direction, and the second direction are perpendicular to each other.

[0017] Thus, with the groove depth within a suitable range, both the fixing strength of the insertion joint and the structural strength of the expansion beam can be taken into account.

[0018] In some embodiments, the dimension of the first groove along the first direction is smaller than the dimension of the first expansion beam along the first direction, and / or, the dimension of the second groove along the first direction is smaller than the dimension of the second expansion beam along the first direction.

[0019] Thus, stress concentration at the groove can be avoided, preventing the expansion beam from cracking or breaking, and reducing the influence of the groove on the bending resistance of the expansion beam.

[0020] In some embodiments, the dimension of the first groove along the first direction is equal to the dimension of the first expansion beam along the first direction, and / or, the dimension of the second groove along the first direction is equal to the dimension of the second expansion beam along the first direction.

[0021] Thus, the first groove and the second groove can be arranged more flexibly to adapt to the dimensions of the first end and the second end.

[0022] In some embodiments, the first end is configured to be inserted into the first groove along the gravity direction, and / or, the second end is configured to be inserted into the second groove along the gravity direction, the gravity direction, the first direction, and the second direction are perpendicular to each other.

[0023] Thus, it is convenient for the partition plate and the expansion beam to be inserted and fitted, simplifying the assembly process. And the bottom of the groove can support the partition plate, disperse the load, and reduce local stress concentration.

[0024] In some embodiments, the first groove is provided with a first opening on one side of the first expansion beam along the first direction. Along the direction of gravity, the first opening is provided in the middle of the expansion beam, and the first end portion is configured to be inserted into the first groove along the first direction, and / or the second groove is provided with a second opening on one side of the second expansion beam along the first direction. Along the direction of gravity, the second opening is provided in the middle of the expansion beam, and the second end portion is configured to be inserted into the second groove along the first direction.

[0025] Thereby, the insertion part of the partition plate and the expansion beam can be configured more flexibly, and the partition plate can be inserted more reasonably according to the size, material and end shape of the partition plate.

[0026] In some embodiments, the partition plate includes an intermediate section between the first end portion and the second end portion, and an insulating layer is provided on the outer peripheral surface of the intermediate section.

[0027] Thereby, the risk of the partition plate being electrically connected to the battery cell can be reduced, the insulation withstand voltage performance of the partition plate can be improved, and the risk of thermal runaway explosion when the battery cell catches fire can be avoided.

[0028] In some embodiments, the first groove penetrates the first expansion beam along the first direction, and / or the second groove penetrates the second expansion beam along the first direction.

[0029] Thereby, the installation and disassembly of the partition plate are further facilitated, and the assembly dimensional tolerance between the partition plate and the expansion beam is absorbed.

[0030] In some embodiments, the partition plate is configured as an integrally formed part.

[0031] Since the partition plate is configured as an integrally formed part, the tensile strength and stiffness of the partition plate can be improved, and further the anti-expansion ability and stability of the battery device can be improved.

[0032] A second aspect of the embodiments of the present application provides an electrical device, including the battery device described in the first aspect of the embodiments of the present application, and the battery device is used to provide electric energy.

[0033] Since the electrical device includes the battery device described in the first aspect of the embodiments of the present application, the electrical device also has good stability.

[0034] Through the present application, the anti-expansion ability of the expansion beam of the battery device can be improved, and further the anti-expansion ability of the battery device can be improved, the expansion force in the battery device can be stabilized under various working conditions, and the stability of the battery device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0036] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0037] Figure 2 Schematic structural diagram of a battery device provided by some embodiments of the present application;

[0038] Figure 3 Schematic structural diagram of a box body part provided by some embodiments of the present application;

[0039] Figure 4 is Figure 3 Partial schematic diagram at position A in;

[0040] Figure 5 Schematic structural diagram of an expansion beam part provided by some embodiments of the present application;

[0041] Figure 6 is Figure 5 Partial schematic diagram at position B in;

[0042] Figure 7 Partial schematic diagram at position B in some other embodiments of the present application;

[0043] Figure 8 Top view of a battery device provided by some embodiments of the present application;

[0044] Figure 9 Top view of a box body part provided by some embodiments of the present application;

[0045] Figure 10 is Figure 9 Partial schematic diagram at position C in;

[0046] Figure 11 Schematic structural diagram of a partition board provided by some embodiments of the present application.

[0047] Description of reference numerals

[0048] 1000. Vehicle; 100. Battery device; 200. Controller; 300. Motor; 10. Box body; 20. Expansion beam; 21. First expansion beam; 21A. First groove; 22. Second expansion beam; 22A. Second groove; 30. Partition board; 31. First end; 31A. First side; 31B. Second side; 32. Second end; 32A. Third side; 32B. Fourth side; 33. Intermediate section; 40. Battery cell group; 41. Battery cell; S. Accommodating space; S1. Subspace. Detailed implementation manners

[0049] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this specification and the above drawings are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term " / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0054] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "parallel" and "perpendicular" are allowed to have a certain degree of tolerance and / or error, including the situations of being approximately parallel and approximately perpendicular.

[0058] Below, this application is described in detail.

[0059] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0060] In new energy vehicles equipped with batteries, these batteries can provide all or part of the power. In the energy storage sector, batteries can be installed in energy storage boxes or directly at the user's side. As demand for batteries continues to increase, so too does the industry's demand for battery expansion resistance. Therefore, improving this resistance is a key research topic in the industry.

[0061] Through research and design, installing expansion beams in the box body of the battery device can improve the anti-expansion ability of the battery device and resist the expansion of battery cells. Fixing partition plates between adjacent expansion beams can further enhance the anti-expansion ability of the expansion beams and disperse the expansion force of the battery cells, enabling the battery device to better cope with various working conditions, such as climbing constant-frequency conditions, rapid acceleration conditions, rapid deceleration conditions, variable-speed conditions, idle conditions, etc., and improving the stability of the battery device.

[0062] Based on such a design concept, the present application designs a battery device, including a box body, at least two expansion beams, at least one partition plate, and at least one battery cell group. The expansion beams are arranged at intervals in the box body along a first direction and define an accommodation space with the box body. The accommodation space houses the battery cell group. The battery cell group includes a plurality of battery cells arranged along the first direction. The partition plate extends along the first direction. The partition plate is arranged in the accommodation space and both ends of the partition plate are fixedly connected to the expansion beams, dividing the accommodation space into a plurality of sub-spaces, and each sub-space houses the battery cell group; the battery device includes a first expansion beam and a second expansion beam. Along the first direction, the partition plate has a first end and a second end. The first expansion beam is provided with a first groove, and the first groove is in plug-in fit with the first end; the second expansion beam is provided with a second groove, and the second groove is in plug-in fit with the second end; along the direction close to the first expansion beam in the first direction, the maximum dimension of the first end along a second direction gradually increases, and / or, along the direction close to the second expansion beam in the first direction, the maximum dimension of the second end along the second direction gradually increases; the second direction is perpendicular to the first direction.

[0063] Since the partition plate extends along the first direction and both ends are fixedly connected to the expansion beams, the support structure formed after the partition plate is fixedly connected to the expansion beams can disperse the mechanical stress generated by the expansion of the battery cells, enabling the expansion beams to have good load-bearing capacity in the first direction, which can buffer the battery cells and provide an inward pressure, improving the anti-expansion ability of the battery device and preventing the excessive expansion amount and deformation amount of the battery cells. In addition, the partition plate can also enhance the bending resistance of the expansion beams, make the force on the expansion beams more uniform, reduce the risk of bending and breaking due to stress concentration, stabilize the expansion force in the battery device under various working conditions, and improve the stability of the battery device. In addition, the plug-in connection is convenient and reliable, which can simplify the assembly process and improve the assembly efficiency. The end of the partition plate is in plug-in fit with the expansion beam, and the mating surface is inclined at an angle with the first direction, which can increase the friction force of the plug-in fit part and reduce the risk of the partition plate loosening or sliding after being subjected to external vibration and impact. The dimension of the end gradually increases along the second direction, further reducing the risk of the partition plate loosening or sliding, and improving the stability of the battery device and the anti-expansion ability of the expansion beams.

[0064] In the following embodiments, for convenience of description, the electrical device in an embodiment of the present application is taken as an example of a vehicle 1000 for illustration. The following will be described with reference to the accompanying drawings.

[0065] Figure 1 FIG. is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed 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 serve as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0066] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source of the vehicle 1000, but also serve as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] In an embodiment of the present application, the battery cell can be a secondary battery. A secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0068] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0069] Although not shown, generally, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes and allowing active ions to pass through at the same time.

[0070] In some embodiments, the electrode assembly is provided with tabs (not shown). The tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0071] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0072] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly and an electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0073] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in this application.

[0074] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealed bag is further included between the housing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating part or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0075] The emissions from the battery cell mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, and so on.

[0076] The battery apparatus mentioned in the embodiments of this 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, parallel, or in a hybrid connection through a current collecting component.

[0077] 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 to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0078] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0079] 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.

[0080] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0081] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0082] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0083] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0084] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0085] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0086] Next, with reference to Figures 2 to 11 Some embodiments of the present application will be described in detail.

[0087] Figure 2 Schematic structural diagram of the battery device provided for some embodiments of the present application; Figure 3 Schematic structural diagram of the box body part provided for some embodiments of the present application; Figure 4 For Figure 3 Partial schematic diagram at A in Figure 5 Schematic structural diagram of the expansion beam part provided for some embodiments of the present application; Figure 6 For Figure 5 Partial schematic diagram at B in Figure 7 Partial schematic diagram at B in some other embodiments of the present application; Figure 8 Top view of the battery device provided for some embodiments of the present application; Figure 9 Top view of the box body part provided for some embodiments of the present application; Figure 10 For Figure 9 Partial schematic diagram at C in Figure 11 Schematic structural diagram of the partition plate provided for some embodiments of the present application.

[0088] In some embodiments of the present application, for ease of description, a first direction, a second direction, and a gravity direction are defined. The directions in which the first direction, the second direction, and the gravity direction are located are directions that intersect each other, where intersecting each other includes perpendicular intersection. To facilitate understanding of the embodiments of the present application, in Figure 2 In the embodiments shown in FIGS. 2 to 10, an example in which the first direction, the second direction, and the gravity direction are perpendicular to each other is used for illustration. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the three directions are perpendicular to each other. For ease of description, as shown by the arrows in FIGS. 2 to 10, the direction in which the arrow X is located is defined as the first direction, the direction in which the arrow Y is located is defined as the second direction, and the direction in which the arrow Z is located is defined as the gravity direction. Sometimes the direction in which the arrow Z points along the gravity direction is also referred to as "upward", and the opposite direction is referred to as "downward".

[0089] A first aspect of the embodiments of the present application provides a battery device 100. In the embodiments of the present application, the battery device 100 includes a box body 10, at least two expansion beams 20, at least one partition plate 30, and at least one battery cell group 40. The expansion beams 20 are arranged in the box body 10 at intervals along the first direction (X), and define an accommodation space S with the box body 10. The accommodation space S accommodates the battery cell group 40. The battery cell group 40 includes a plurality of battery cells 41 arranged along the first direction (X). The partition plate 30 extends along the first direction (X). The partition plate 30 is disposed in the accommodation space S and both ends of the partition plate 30 are fixedly connected to the expansion beams 20, dividing the accommodation space S into a plurality of sub-spaces S1. Each sub-space S1 accommodates the battery cell group 40. The battery device 100 includes a first expansion beam 21 and a second expansion beam 22. Along the first direction (X), the partition plate 30 has a first end 31 and a second end 32. The first expansion beam 21 is provided with a first groove 21A, and the first groove 21A is in plug-in fit with the first end 31; the second expansion beam 22 is provided with a second groove 22A, and the second groove 22A is in plug-in fit with the second end 32. Along the direction of approaching the first expansion beam 21 along the first direction (X), the maximum dimension of the first end 31 along the second direction (Y) gradually increases, and / or along the direction of approaching the second expansion beam 22 along the first direction (X), the maximum dimension of the second end 32 along the second direction (Y) gradually increases; the second direction (Y) is perpendicular to the first direction (X).

[0090] Optionally, the box body 10 at least includes a frame and a bottom plate. The frame is arranged around the edge of the bottom plate, and the frame defines the accommodation space S.

[0091] It can be understood that the material of the frame should have sufficient strength, stiffness, and corrosion resistance, and while playing a supporting and protective role in the battery device 100, the weight should be reduced as much as possible to improve energy efficiency. Commonly used materials include aluminum alloy, high-strength steel, or composite materials, etc.

[0092] Optionally, the frame can be made of a metallic material with a certain strength. Exemplarily, an L-shaped angle steel, I-beam, C-shaped steel, or Z-shaped steel can be used for manufacturing. The present application does not limit the forming method of the frame.

[0093] Optionally, the frame can be formed by die casting, roll forming, extrusion forming, or cutting a profile.

[0094] Optionally, the shapes of multiple interconnected frames include, but are not limited to, a rectangular structure, a circular structure, a triangular structure, a pentagonal structure, a hexagonal structure, a rhombic structure, or an elliptical structure, etc. Correspondingly, the shape of the accommodation space S matches the shape of the frame.

[0095] Exemplarily, as Figure 2 shown, the frame is formed into a rectangular frame structure.

[0096] The expansion beam 20 is a beam structural member that can withstand and limit the expansion force, and can buffer the expansion of the battery cell 41 and provide an inward pressure to prevent the excessive expansion amount and deformation amount of the battery cell 41.

[0097] It can be understood that the expansion beam 20 can be a hollow beam structure, a hollow shell plate structure, or a cylindrical structure, etc. The outer contour of the cross-section of the expansion beam 20 can be circular, elliptical, or polygonal. The expansion beam 20 can be formed by assembling and enclosing with plate structures, or formed by stretching process, or obtained by processes such as extrusion and roll forming.

[0098] Optionally, the hollow part inside the expansion beam 20 can form a cavity. The function of the cavity is that when the expansion beam 20 is subjected to an extrusion force, it deforms to absorb and disperse stress, and can absorb the expansion deformation of the battery cell 41. At the same time, it can also reduce the material usage of the beam body, which is beneficial to the lightweight of the battery device 100. The cross-section of the cavity can be a polygon such as a triangle or a rectangle. Reinforcing ribs can also be provided in the cavity to improve the torsional stiffness and bending stiffness of the beam.

[0099] Optionally, the expansion beam 20 can be made of a metal material or a composite material. The metal material can be, for example, aluminum alloy. The composite material can include fiber materials, resin materials, etc. The resin material matrix is responsible for transmitting stress and providing environmental adaptability and durability. The fiber material can be unidirectional continuous fiber, and the resin material can be polyurethane, epoxy, vinyl, etc. The fiber material is mainly responsible for increasing the strength and stiffness of the material and can also withstand a certain load. In addition, the composite material can also include fillers, such as glass powder, talc powder, carbon black, etc., which can improve the performance of the composite material, such as reducing costs, improving wear resistance or improving electromagnetic properties, etc. The composite material can also include functional additives, such as curing agents, catalysts, flame retardants, ultraviolet stabilizers, etc., which are chemical substances used to improve the material properties.

[0100] Optionally, the expansion beam 20 can be fixed to the frame of the box body 10, or can be fixed to the bottom plate of the box body 10, or can be fixed to both the frame and the bottom plate at the same time. In some other embodiments, the expansion beam 20 and the box body 10 can be formed into an integrally formed structure by means of roll pressing, casting, etc. The embodiments of the present application do not limit this.

[0101] Optionally, the expansion beam 20 and the box body 10 can be further strengthened by means of bonding, welding, connecting with fastening components, etc.

[0102] In a specific embodiment, the expansion beam 20 is connected to the frame of the box body 10 by means of welding, bolt connection, etc. The expansion beam 20 extends along the second direction (Y), and both ends are connected to the frame.

[0103] Exemplarily, two expansion beams 20 are arranged at intervals along the first direction (X) inside the box body 10, and define an accommodation space S with the box body 10. The accommodation space S accommodates the battery cell group 40, and the battery cell group 40 includes a plurality of battery cells 41 arranged along the first direction (X). That is, the first expansion beam 21 is arranged at one end of the battery cell group 40 along the first direction (X), and the second expansion beam 22 is arranged at the other end of the battery cell group 40 along the first direction (X).

[0104] It can be understood that the battery cells 41 in the battery cell group 40 are arranged along the first direction (X), that is, the first direction (X) is the stacking arrangement direction of the battery cells 41.

[0105] Exemplarily, the partition plate 30 can be connected to both the first expansion beam 21 and the second expansion beam 22 at the same time, so as to be able to restrict the relative positions of the first expansion beam 21 and the second expansion beam 22 along the first direction (X). In this way, the constraint ability and expansion resistance ability of the first expansion beam 21 and the second expansion beam 22 on the battery cells 41 in the first direction (X) can be improved.

[0106] Optionally, the partition plate 30 is a steel plate, an iron plate, an aluminum plate, an aluminum alloy plate or a polymer material plate.

[0107] Exemplarily, the partition plate 30 is made of aluminum alloy and formed into an aluminum alloy profile by extrusion molding. Its cross-section may have a cavity or may not have one, and the embodiments of the present application do not limit this.

[0108] In a specific embodiment, the partition plate 30 divides the accommodation space S into a plurality of sub-spaces S1, and each sub-space S1 accommodates a battery cell group 40, so that the battery cell group 40 is stably installed and a certain distance is provided between adjacent battery cell groups 40 along the second direction (Y).

[0109] It can be understood that the shape and size of the first groove 21A are adapted to those of the first end 31, and the shape and size of the second groove 22A are adapted to those of the second end 32.

[0110] Optionally, the sizes of the first end 31 and the second end 32 may be the same or different.

[0111] Exemplarily, as Figure 11 shown, the sizes of the first end 31 and the second end 32 may be the same, which is convenient for processing and assembly and also makes the force on the partition plate 30 more uniform.

[0112] Optionally, the opening of the first groove 21A may be located on one side of the first expansion beam 21 along the gravity direction (Z) or on one side of the first expansion beam 21 along the first direction (X).

[0113] Optionally, the opening of the second groove 22A may be located on one side of the second expansion beam 22 along the gravity direction (Z) or on one side of the second expansion beam 22 along the first direction (X).

[0114] Thus, the plug-in connection is convenient and reliable, which can simplify the assembly process of the partition plate 30 and the two expansion beams and improve the assembly efficiency. The plug-in fit between the end and the groove can also transfer loads and prevent loosening.

[0115] In a specific embodiment, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 , Figure 11As shown, along the first direction (X), the partition plate 30 has a first end 31 and a second end 32. The first expansion beam 21 is provided with a first groove 21A, and the first groove 21A is in plug-in fit with the first end 31; the second expansion beam 22 is provided with a second groove 22A, and the second groove 22A is in plug-in fit with the second end 32; on opposite sides of the first end 31 along the second direction (Y), there are a first side 31A and a second side 31B. Along the direction of the first expansion beam 21 in the first direction (X), the maximum dimension of the first end 31 along the second direction (Y) gradually increases, that is, the first side 31A and the second side 31B move away from each other; when observed along the gravity direction (Z), the shapes of the first end 31 and the first groove 21A are wedge-shaped. On opposite sides of the second end 32 along the second direction (Y), there are a third side 32A and a fourth side 32B. Along the direction of the second expansion beam 22 in the first direction (X), the maximum dimension of the second end 32 along the second direction (Y) gradually increases, that is, the third side 32A and the fourth side 32B move away from each other; when observed along the gravity direction (Z), the shapes of the second end 32 and the second groove 22A are wedge-shaped.

[0116] Optionally, the angle between the first side 31A and the first direction (X) and the angle between the second side 31B and the first direction (X) can be the same or different. The embodiments of the present application do not limit this.

[0117] Optionally, the angle between the third side 32A and the first direction (X) and the angle between the fourth side 32B and the first direction (X) can be the same or different. The embodiments of the present application do not limit this.

[0118] Through the cooperation between the first end 31 and the first groove 21A and the cooperation between the second end 32 and the second groove 22A, the mortise and tenon plug-in limit between the partition plate 30, the first expansion beam 21, and the second expansion beam 22 is realized. There is a self-locking characteristic between the partition plate 30, the first expansion beam 21, the second expansion beam 22, and the box body 10, which is beneficial to improving the connection reliability between the above-mentioned parts.

[0119] Because the separator 30 extends along the first direction (X) and is fixedly connected to the expansion beam 20 at both ends, the support structure formed by the fixed connection between the separator 30 and the expansion beam 20 can disperse the mechanical stress generated by the expansion of the battery cells 41, ensuring that the expansion beam 20 has good load-bearing capacity in the first direction (X). This acts as a buffer for the battery cells 41 and provides inward pressure, thereby improving the battery assembly 100's resistance to expansion and preventing excessive expansion and deformation of the battery cells 41. Furthermore, the separator 30 improves the expansion beam 20's bending resistance, ensuring more uniform force distribution and reducing the risk of bending and breakage due to stress concentration. This stabilizes the expansion force within the battery assembly 100 under various operating conditions, enhancing the stability of the battery assembly 100. Furthermore, the ends of the separator 30 are plugged into the expansion beam 20, with the mating surfaces angled with respect to the first direction (X). This increases friction between the plugged and mated parts and reduces the risk of the separator 30 loosening or slipping due to external vibration. In addition, the two side surfaces of the end portion gradually approach each other, further reducing the risk of the partition plate 30 being loosened or slipped, thereby improving the stability of the battery device 100 and the anti-expansion capability of the expansion beam 20 .

[0120] In the embodiment of the present application, the battery cell 41 has a plurality of wall surfaces, and the side wall surface with the largest area among the plurality of wall surfaces is perpendicular to the first direction (X).

[0121] In a specific embodiment, the battery cell 41 may be a square shell battery, such as Figure 2 、 Figure 8 As shown, the sidewalls refer to the walls of the battery cell 41 along both sides of the first direction (X) and the second direction (Y). The sidewalls with the largest area are the large surfaces of the prismatic battery. In the battery cell group 40, the large surfaces of each battery cell 41 are perpendicular to the first direction (X).

[0122] It is understandable that the expansion of the battery cell 41 usually occurs along its thickness direction. This is because the design of the battery cell 41 is usually to stack electrode materials together, and the space between layers is limited. When gas is generated inside, the direction that is most likely to expand is the thickness direction of the battery cell 41.

[0123] In a specific embodiment, Figure 2 、 Figure 8 As shown, the thickness direction of the battery cells 41 is the first direction (X), the large surface of each battery cell 41 is perpendicular to the first direction (X), and the stacking direction of the battery cells 41 is also the first direction (X).

[0124] In a specific embodiment, the first expansion beam 21 contacts the large surface of one battery cell 41 in the battery cell group 40 , and the second expansion beam 22 contacts the large surface of another battery cell 41 in the battery cell group 40 , which can better resist the expansion of the battery cell 41 .

[0125] Thus, the expansion beam 20 can better resist the expansion of the battery cell 41 in the first direction (X) during cycling, reducing the risk of deformation and rupture after expansion.

[0126] In an embodiment of the present application, opposite sides of the first end portion 31 in the second direction (Y) have a first side surface 31A and a second side surface 31B. The first side surface 31A and the second side surface 31B are arc-shaped surfaces. The first side surface 31A protrudes towards the side where the second side surface 31B is located in the second direction (Y), and the second side surface 31B protrudes towards the side where the first side surface 31A is located in the second direction (Y). And / or, opposite sides of the second end portion 32 in the second direction (Y) have a third side surface 32A and a fourth side surface 32B. The third side surface 32A and the fourth side surface 32B are arc-shaped surfaces. The third side surface 32A protrudes towards the side where the fourth side surface 32B is located in the second direction (Y), and the fourth side surface 32B protrudes towards the side where the third side surface 32A is located in the second direction (Y).

[0127] Exemplarily, as Figure 10 、 Figure 11 shown, the first side surface 31A and the second side surface 31B are arc-shaped surfaces. The first side surface 31A protrudes towards the side where the second side surface 31B is located in the second direction (Y), and the second side surface 31B protrudes towards the side where the first side surface 31A is located in the second direction (Y); the third side surface 32A and the fourth side surface 32B are arc-shaped surfaces. The third side surface 32A protrudes towards the side where the fourth side surface 32B is located in the second direction (Y), and the fourth side surface 32B protrudes towards the side where the third side surface 32A is located in the second direction (Y).

[0128] It can be understood that the arc-shaped mating surfaces of the groove and the end portion can form a more uniform contact pressure, dispersing the stress to a wider contact area. The curvature of the arc-shaped surface is not limited in the embodiment of the present application.

[0129] Since the mating surface shape of the separator 30 and the expansion beam 20 is arc-shaped, it can reduce the stress concentration at the end portion of the separator 30, reducing the risk of disconnection or tearing in the groove, and can also improve the stress-bearing performance of the separator 30 and enhance the tensile strength.

[0130] In an embodiment of the present application, the first end portion 31 is provided with a first welding portion, and the first welding portion is welded to the inner surface of the first groove 21A. And / or, the second end portion 32 is provided with a second welding portion, and the second welding portion is welded to the inner surface of the second groove 22A.

[0131] Optionally, welding can be performed at the edge position, gap position, etc. of the inserted part, and this welding position is defined as the first welding portion and the second welding portion.

[0132] Exemplarily, the edges where the first side surface 31A contacts the first groove 21A and the edges where the second side surface 31B contacts the first groove 21A can be defined as the first welding part, and welding is performed at the above positions.

[0133] Also exemplarily, the edges where the third side surface 32A contacts the second groove 22A and the edges where the fourth side surface 32B contacts the second groove 22A can be defined as the second welding part, and welding is performed at the above positions.

[0134] Thus, welding can further improve the bonding strength of the inserted and mated part of the partition plate 30 and the expansion beam 20, and improve the stability of the battery device 100.

[0135] In the embodiment of the present application, the expansion beam 20 extends along the second direction (Y), and multiple partition plates 30 are arranged along the second direction (Y).

[0136] The number of partition plates 30 is multiple. Exemplarily, as Figure 3 , Figure 9 shown, three partition plates 30 are arranged at intervals in the accommodation space S of the box body 10, forming four sub-spaces S1. As Figure 8 shown, four battery monomer groups 40 can be accommodated.

[0137] Or, also exemplarily, in an embodiment not shown, at least two partition plates 30 are arranged in a staggered manner in the accommodation space S of the box body 10.

[0138] Or, in some other possible designs, at least two partition plates 30 are arranged at intervals in the accommodation space S of the box body 10, and at least two partition plates 30 are arranged in a staggered manner in the accommodation space S of the box body 10.

[0139] Optionally, the battery device 100 may include at least two partition plates 30 that are spaced and parallel, or may include at least two partition plates 30 that are spaced and non-parallel. That is, at least two partition plates 30 are spaced and parallel; or, at least two partition plates 30 are spaced and non-parallel; or, at least two partition plates 30 are spaced and parallel, and at least two partition plates 30 are spaced and non-parallel. Among them, at least one partition plate 30 may be spaced and parallel to a part of the partition plates 30 and spaced and non-parallel to another part of the partition plates 30.

[0140] At least two partition plates 30 are arranged in a staggered manner in the accommodation space S of the box body 10 means that at least two partition plates 30 are not arranged at intervals, and their extending directions intersect, and at least two partition plates 30 have an overlapping part.

[0141] When at least two partition plates 30 are spaced apart from each other on the first box wall and at least two partition plates 30 are staggered on the first box wall, at least one partition plate 30 can be staggered with a part of the partition plates 30 and spaced apart from another part of the partition plates 30.

[0142] By providing a plurality of partition plates 30, the plurality of partition plates 30 can be flexibly distributed in the accommodation space S of the box body 10 in a variety of states, thereby improving the structural strength and anti-expansion ability of the box body 10.

[0143] Thereby, the bending resistance and anti-expansion ability of the expansion beam 20 can be further enhanced.

[0144] In the embodiment of the present application, the depth dimension of the first groove 21A in the gravity direction (Z) is 50% to 80% of the dimension of the first expansion beam 21 in the gravity direction (Z); and / or, the depth dimension of the second groove 22A in the gravity direction (Z) is 50% to 80% of the dimension of the second expansion beam 22 in the gravity direction (Z); the gravity direction (Z), the first direction (X), and the second direction (Y) are perpendicular to each other.

[0145] Optionally, the dimensions of the first expansion beam 21 and the second expansion beam 22 in the gravity direction (Z) may be the same or different, and the depth dimensions of the first groove 21A and the second groove 22A in the gravity direction (Z) may be the same or different.

[0146] Optionally, Figure 6 the depth dimension H1 of the first groove 21A in the gravity direction (Z) may be 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. of the dimension H of the first expansion beam 21 in the gravity direction (Z). Other values are not listed.

[0147] Optionally, the depth dimension of the second groove 22A in the gravity direction (Z) may be 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. of the dimension of the second expansion beam 22 in the gravity direction (Z), and other values are not listed.

[0148] Thereby, the groove depth is within a suitable range, which can take into account both the fixing strength of the plug-in connection and the structural strength of the expansion beam 20. It is also convenient to weld the plug-in mating part.

[0149] In the embodiment of the present application, the dimension of the first groove 21A in the first direction (X) is smaller than the dimension of the first expansion beam 21 in the first direction (X), and / or, the dimension of the second groove 22A in the first direction (X) is smaller than the dimension of the second expansion beam 22 in the first direction (X).

[0150] It is understandable that the dimension of the first expansion beam 21 in the first direction (X) refers to the dimension of the partial beam section provided with the first groove 21A, and the dimension of the second expansion beam 22 in the first direction (X) refers to the dimension of the partial beam section provided with the second groove 22A.

[0151] Exemplarily, as Figure 5 , Figure 6 shown, the dimension of the first groove 21A in the first direction (X) is smaller than the dimension of the first expansion beam 21 in the first direction (X), and the first groove 21A does not penetrate through the first expansion beam 21 in the first direction (X). The dimension of the second groove 22A in the first direction (X) is smaller than the dimension of the second expansion beam 22 in the first direction (X), and the second groove 22A does not penetrate through the second expansion beam 22 in the first direction (X).

[0152] Thereby, it is possible to avoid cracking or breaking of the expansion beam caused by stress concentration at the groove, and reduce the influence of the groove on the bending resistance of the expansion beam.

[0153] In some embodiments not shown, the dimension of the first groove 21A in the first direction (X) is equal to the dimension of the first expansion beam 21 in the first direction (X), and / or the dimension of the second groove 22A in the first direction (X) is equal to the dimension of the second expansion beam 22 in the first direction (X).

[0154] That is, the first groove 21A penetrates through the first expansion beam 21 in the first direction (X), and / or the second groove 22A penetrates through the second expansion beam 22 in the first direction (X).

[0155] Exemplarily, the first groove 21A penetrates through the first expansion beam 21 in the first direction (X), and the second groove 22A penetrates through the second expansion beam 22 in the first direction (X).

[0156] Also exemplarily, the first groove 21A may penetrate through the first expansion beam 21 in the first direction (X), and the second groove 22A may not penetrate through the second expansion beam 22.

[0157] Still exemplarily, the first groove 21A may not penetrate through the first expansion beam 21, and the second groove 22A may penetrate through the second expansion beam 22 in the first direction (X).

[0158] Thereby, it is further convenient for the installation and disassembly of the partition plate 30, and the assembly dimensional tolerance between the partition plate and the expansion beam can be absorbed.

[0159] In an embodiment of the present application, a first opening is provided on one side of the first expansion beam 21 along the first direction (X) in the first groove 21A. Along the gravity direction (Z), the first opening is provided in the middle of the expansion beam. The first end portion is configured to be inserted into the first groove 21A along the first direction (X), and / or a second opening is provided on one side of the second expansion beam 22 along the first direction (X) in the second groove 22A. Along the gravity direction (Z), the second opening is provided in the middle of the expansion beam. The second end portion is configured to be inserted into the second groove 22A along the first direction (X).

[0160] It can be understood that the opening of the groove is provided on one side of the expansion beam along the first direction (X), and the middle refers to the middle area of the expansion beam along the gravity direction (Z).

[0161] Exemplarily, as Figure 7 shown, a first opening is provided on one side of the first expansion beam 21 along the first direction (X) in the first groove 21A. Along the gravity direction (Z), the first opening is provided in the middle of the expansion beam.

[0162] Exemplarily, in this embodiment, the first end portion or the second end portion may be a pair of elastic pieces oppositely arranged along the second direction (Y), which can be inserted into the first groove 21A or the second groove 22A in a compressed state and engage with the groove after restoration. Other embodiments will not be listed.

[0163] Thus, the insertion part of the partition plate 30 and the expansion beam can be configured more flexibly, and the partition plate 30 can be inserted more reasonably according to the size, material and end shape of the partition plate 30.

[0164] In an embodiment of the present application, the first end portion 31 is configured to be inserted into the first groove 21A along the gravity direction (Z), and / or the second end portion 32 is configured to be inserted into the second groove 22A along the gravity direction (Z), and the gravity direction (Z), the first direction (X) and the second direction (Y) are perpendicular to each other.

[0165] Thus, it is convenient for the partition plate 30 to be inserted and matched with the expansion beam, simplifying the assembly process. And the bottom of the groove can support the partition plate 30, disperse the load and reduce local stress concentration.

[0166] In an embodiment of the present application, as Figure 10 , Figure 11 shown, the partition plate 30 includes an intermediate section 33 between the first end portion 31 and the second end portion 32, and an insulating layer is provided on the outer peripheral surface of the intermediate section 33.

[0167] In a specific embodiment, a TC composite tape (ceramic composite tape) can be wound or pasted on the outer peripheral surface of the middle section 33 to avoid insulation failure, improve the insulation withstand voltage performance of the battery device 100, and prevent thermal runaway explosion when the battery cell 41 catches fire. Thus, the risk of conduction between the separator 30 and the battery cell 41 can be reduced, the insulation withstand voltage performance of the separator 30 can be improved, and the risk of thermal runaway explosion when the battery cell 41 catches fire can be avoided.

[0168] Optionally, a foam layer can also be wrapped around the outer peripheral surface of the middle section 33 of the separator 30. The foam layer plays a buffering and supporting role for the battery cell group 40, avoiding the shaking and collision of each battery cell group 40, and at the same time also playing a flame retardant and insulating role.

[0169] Optionally, the insulating layer can also be an insulating coating, and the embodiments of the present application do not limit this.

[0170] In the embodiment of the present application, the separator 30 is configured as an integrally formed part.

[0171] Optionally, the separator 30 is a metal part and can be integrally formed by extrusion, stamping, casting, etc.

[0172] Since the separator 30 is configured as an integrally formed part, the tensile strength and stiffness of the separator 30 can be improved, and the anti-expansion ability and stability of the battery device 100 can be further improved.

[0173] The second aspect of the embodiments of the present application provides an electrical device. In the embodiments of the present application, the electrical device includes the battery device 100 of the first aspect of the embodiments of the present application, and the battery device 100 is used to provide electrical energy.

[0174] Exemplarily, as Figure 1 shown, the electrical device can be a vehicle 1000. The battery device 100 is arranged inside the vehicle 1000, and the battery device 100 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 source 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, it is used for the working power consumption requirements during the start, navigation and driving of the vehicle 1000.

[0175] Since the electrical device includes the battery device 100 of the first aspect of the embodiments of the present application, the electrical device also has good stability.

[0176] The following describes the specific solutions of the embodiments of the present application with reference to the drawings.

[0177] This embodiment provides a battery device 100, which includes a box body 10, at least two expansion beams 20, at least one partition plate 30, and at least one battery cell group 40. The expansion beams 20 are arranged in the box body 10 at intervals along the first direction (X), and define an accommodation space S with the box body 10. The accommodation space S houses the battery cell group 40. The battery cell group 40 includes a plurality of battery cells 41 arranged along the first direction (X). The partition plate 30 extends along the first direction (X), is disposed in the accommodation space S, and both ends of the partition plate 30 are fixedly connected to the expansion beams 20, dividing the accommodation space S into a plurality of sub-spaces S1, and each sub-space S1 houses the battery cell group 40.

[0178] As Figure 11 shown, the cross-sectional shapes of both ends of the partition plate 30 designed in this embodiment are wedge-shaped, and the middle section 33 is a long plate. The wedge-shaped mechanical structure has more uniform stress, is more conducive to withstanding the tensile force of the expansion beam 20, and realizes better anti-expansion force performance.

[0179] The structure of the partition plate 30 designed in this embodiment realizes the function of resisting the expansion force during charge and discharge of the battery cell 41 by making multiple slots on the first expansion beam 21 and the second expansion beam 22 of the box body 10, placing the ends of the partition plate 30 in the first groove 21A and the second groove 22A, and welding at the mating part of the partition plate 30 and the expansion beam 20.

[0180] As Figure 5 、 Figure 6 shown, the expansion beam 20 designed in this embodiment is slotted, and the shape of the slot matches the wedge-shaped cross-sectional shape of the end of the partition plate 30, which is convenient for installation and makes the force transmission between the expansion beam 20 and the partition plate 30 more uniform. The expansion force is transmitted from the expansion beam 20 to the partition plate 30, and the partition plate 30 bears the tensile force, improving the service life and stability of the overall structure.

[0181] This embodiment also designs the side surface of the end of the partition plate 30 to be an arc surface. By making grooves with the same radian to fit the end of the partition plate 30, the stress performance is good, the tensile performance of a single partition plate 30 is improved, and the anti-expansion ability is further improved.

[0182] As Figure 4 、 Figure 10 shown, the partition plate 30 designed in this embodiment is assembled with the slotted expansion beam 20, and the fitting seam is small after assembly, which is convenient for welding. After the partition plate 30 and the expansion beam 20 are assembled, welding is completed to improve the bonding strength, and the combination of the partition plate 30 and the expansion beam 20 is strengthened secondly, further improving the overall anti-expansion performance.

[0183] As Figure 3 、 Figure 9As shown, multiple partition plates 30 can be arranged on the side of the multi-column battery cells 41 designed in this embodiment. The thickness of the partition plate 30 can be increased, and the width of the slot can be increased accordingly. The width of the partition plate 30 can be increased to the same width as the expansion beam 20, making the most of the space in the battery device 100 in the gravity direction (Z). As the thickness and width of the partition plate 30 increase, the expansion force that the partition plate 30 can withstand also increases, and the overall anti-expansion performance of the battery device 100 is improved.

[0184] In addition, in this embodiment, a TC composite tape is wound around the partition plate 30 as an insulating layer to improve the insulation and voltage withstand performance of the partition plate 30. To avoid insulation failure and prevent thermal runaway explosion when the battery catches fire.

[0185] Through the above structural design, the box body 10 combines the anti-expansion performance of the partition plate 30, better resists the expansion force of the battery pack, improves the overall anti-expansion ability of the battery device 100, avoids the risk of fatigue fracture, reduces the bolt installation process of the battery device 100, saves the space in the gravity direction (Z) of the battery device 100, improves the overall anti-expansion performance of the battery device 100, and improves the reliability of the battery device 100. It also increases the main frequency of the battery pack and ensures that the battery pack will not fail due to expansion force within the service life. When the battery device 100 is applied to a vehicle, it can provide a stable expansion force under various working conditions such as climbing at a fixed frequency, rapid acceleration, rapid deceleration, gear shifting, and idling, so that the main frequency of the battery device 100 is stable.

[0186] If there is no special indication, all the implementation manners and optional implementation manners of this application can be combined with each other to form a new technical solution.

[0187] If there is no special indication, all the technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0188] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the protection claimed in this application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. This application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claimed protection.

Claims

1. A battery device, characterized in that, It includes a box body, at least two expansion beams, at least one partition board, and at least one battery cell group. The expansion beams are arranged in the box body at intervals along a first direction, and define a receiving space with the box body, and the battery cell group is received in the receiving space. The battery cell group includes a plurality of battery cells arranged along the first direction. The partition board extends along the first direction, the partition board is arranged in the receiving space and both ends of the partition board are fixedly connected to the expansion beams, dividing the receiving space into a plurality of sub-spaces, and each of the sub-spaces receives the battery cell group. The battery device includes a first expansion beam and a second expansion beam. Along the first direction, the partition board has a first end and a second end. The first expansion beam is provided with a first groove, and the first groove is in plug-in fit with the first end; the second expansion beam is provided with a second groove, and the second groove is in plug-in fit with the second end. Along the first direction and in the direction close to the first expansion beam, the maximum dimension of the first end along a second direction gradually increases, and / or Along the first direction and in the direction close to the second expansion beam, the maximum dimension of the second end along the second direction gradually increases; the second direction is perpendicular to the first direction.

2. The battery device according to claim 1, characterized in that The battery cell has a plurality of wall surfaces, and the side wall surface with the largest area among the plurality of wall surfaces is perpendicular to the first direction.

3. The battery device according to claim 1, wherein, The opposite sides of the first end along the second direction have a first side surface and a second side surface, the first side surface and the second side surface are arc-shaped surfaces, the first side surface protrudes towards the side where the second side surface is located along the second direction, and the second side surface protrudes towards the side where the first side surface is located along the second direction, and / or The opposite sides of the second end along the second direction have a third side surface and a fourth side surface, the third side surface and the fourth side surface are arc-shaped surfaces, the third side surface protrudes towards the side where the fourth side surface is located along the second direction, and the fourth side surface protrudes towards the side where the third side surface is located along the second direction.

4. The battery device according to claim 1, wherein, The first end is provided with a first welding part, and the first welding part is welded to the inner surface of the first groove, and / or the second end is provided with a second welding part, and the second welding part is welded to the inner surface of the second groove.

5. The battery device according to claim 1, wherein The expansion beams extend along the second direction, and a plurality of the partition boards are arranged in a row along the second direction.

6. The battery device according to any one of claims 1, 3, and 5, characterized in that The depth dimension of the first groove along the gravity direction is 50% to 80% of the dimension of the first expansion beam along the gravity direction; and / or the depth dimension of the second groove along the gravity direction is 50% to 80% of the dimension of the second expansion beam along the gravity direction; the gravity direction, the first direction, and the second direction are perpendicular to each other.

7. The battery device according to any one of claims 1 to 5, characterized in that, The dimension of the first groove along the first direction is smaller than the dimension of the first expansion beam along the first direction, and / or the dimension of the second groove along the first direction is smaller than the dimension of the second expansion beam along the first direction.

8. The battery device according to any one of claims 1 to 5, characterized in that, The dimension of the first groove along the first direction is equal to the dimension of the first expansion beam along the first direction, and / or the dimension of the second groove along the first direction is equal to the dimension of the second expansion beam along the first direction.

9. The battery device according to any one of claims 1, 3, and 5, characterized in that, The first end portion is configured to be inserted into the first groove along the direction of gravity, and / or the second end portion is configured to be inserted into the second groove along the direction of gravity, and the direction of gravity, the first direction and the second direction are perpendicular to each other.

10. The battery device according to any one of claims 1 to 5, characterized in that, The first groove is provided with a first opening on one side of the first expansion beam along the first direction, and along the direction of gravity, the first opening is provided in the middle of the expansion beam. The first end portion is configured to be inserted into the first groove along the first direction, and / or the second groove is provided with a second opening on one side of the second expansion beam along the first direction, and along the direction of gravity, the second opening is provided in the middle of the expansion beam. The second end portion is configured to be inserted into the second groove along the first direction.

11. The battery device according to any one of claims 1 to 5, characterized in that, The partition plate includes an intermediate section between the first end portion and the second end portion, and an insulating layer is provided on the outer peripheral surface of the intermediate section.

12. The battery device according to any one of claims 1 to 5, characterized in that, The first groove penetrates through the first expansion beam along the first direction, and / or the second groove penetrates through the second expansion beam along the first direction.

13. The battery device according to any one of claims 1 to 5, characterized in that, The partition plate is configured to be an integrally formed part.

14. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1 to 13, the battery device being configured to provide electrical energy.

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