Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, the battery device comprises a box body and a plurality of battery modules, the box body is provided with an accommodating space, the plurality of battery modules are arranged in the accommodating space, and the plurality of battery modules are arranged in a first direction. Wherein the battery module comprises a shell and a plurality of electrode assemblies, the shell comprises a plurality of accommodating cavities, the plurality of accommodating cavities are arranged along a second direction and are not communicated with one another, each accommodating cavity is internally provided with one electrode assembly, and the plurality of accommodating cavities and the electrode assemblies in the accommodating cavities form a plurality of battery units; one of the first direction and the second direction is the length direction of the battery device, and the other of the first direction and the second direction is the width direction of the battery device. And each battery module forms a plurality of battery units along the second direction, and the plurality of battery units share one shell, so that the overall rigidity of the battery device can be improved in the second direction, and the condition that the battery device is damaged due to external impact is reduced.

Description

Technical Field

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

[0002] With the development of new energy, more and more fields are adopting new energy as a power source. Due to its advantages such as high energy density, rechargeable, safe and environmentally friendly, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] The overall rigidity of the battery device is poor, and the battery device is easily damaged when subjected to external impact. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which solves the problem of poor overall rigidity of the battery device.

[0005] A first aspect of the present application provides a battery device, comprising:

[0006] The box body has a receiving space;

[0007] A plurality of battery modules are arranged in the accommodating space, and the plurality of battery modules are arranged in a first direction;

[0008] In which, the battery module includes a shell and multiple electrode assemblies, the shell includes multiple accommodating cavities, the multiple accommodating cavities are arranged along the second direction and are not connected to each other, each accommodating cavity is respectively provided with an electrode assembly, and the multiple accommodating cavities and the electrode assemblies therein constitute multiple battery cells, one of the first direction and the second direction is the length direction of the battery device, and the other of the first direction and the second direction is the width direction of the battery device.

[0009] In the present application, multiple battery modules are arranged along a first direction inside the box, and each battery module forms multiple battery cells along a second direction. The multiple battery cells share a shell, thereby improving the overall rigidity of the battery device in the second direction and reducing damage to the battery device caused by external impact.

[0010] In some embodiments of the present application, the housing comprises:

[0011] A housing, wherein a plurality of receiving slots having a first opening are provided on the housing, and the receiving slots are arranged along a second direction;

[0012] The cover body is connected to the shell and closes the first opening of each receiving groove. The cover body and the receiving groove surround an receiving cavity.

[0013] The housing is set as a combined structure of a cover body and a shell, which facilitates the assembly of the electrode assembly into the accommodation cavity, thereby improving the convenience of assembly.

[0014] In some embodiments of the present application, the cover body includes a plurality of top covers. The plurality of top covers are correspondingly arranged with a plurality of accommodation grooves. The plurality of top covers are arranged along the second direction and are all connected to the shell. The top cover is used to close the first opening of the corresponding accommodation groove.

[0015] The cover body is set as a plurality of top covers, and the top covers are used to connect with the shell to close the opening of the accommodation groove, which can reduce the situation that the cover body fails to tightly close the first opening due to manufacturing tolerances and other reasons, and improves the sealing performance of the accommodation cavity.

[0016] In some embodiments of the present application, both the shell and the top cover are metal parts. Along the second direction, any two adjacent top covers are arranged at intervals. The electrode assembly is insulated from the shell and the top cover respectively. Setting the shell and the top cover as metal parts can improve the structural strength of the housing, thereby improving the impact resistance of the battery module and further enhancing the overall rigidity of the battery device.

[0017] In some embodiments of the present application, the top cover and the shell are fixed by welding. The welding fixing connection method is convenient for processing, and at the same time, the structural strength of the connection position is relatively high. In addition, it can improve the sealing performance of the accommodation cavity.

[0018] In some embodiments of the present application, the weld seam between the top cover and the shell is arranged along the circumference of the first opening and surrounds the first opening for one week. Such a setting can further improve the structural strength of the connection position and the sealing performance of the accommodation cavity.

[0019] In some embodiments of the present application, along the second direction, there is a first distance between two adjacent top covers. The first distance is in the range of 2 mm to 15 mm. By setting the first distance, the influence on adjacent top covers during the welding process between the top cover and the shell is reduced, and the product quality of the battery module is improved.

[0020] In some embodiments of the present application, the first distance is in the range of 5 mm to 8 mm. By further setting the first distance, on the basis of having an effective interval space between two adjacent top covers, controlling the first distance can reduce the occupation of the size of the battery module in the second direction, thereby reducing the influence on the energy density of the battery device.

[0021] In some embodiments of the present application, the top cover is arranged outside the first opening of the accommodation groove and abuts against the shell. Such a setting facilitates the positioning of the top cover during the assembly process and can improve the convenience of the assembly process.

[0022] In some embodiments of the present application, the top cover is embedded in the first opening of the receiving groove, and the circumferential edge of the top cover abuts against the inner wall of the receiving groove. With this arrangement, the situation where the top cover protrudes relative to the housing can be reduced, thereby effectively reducing the overall volume of the battery module.

[0023] In some embodiments of the present application, the side surface of the top cover facing away from the receiving cavity is flush with the outer surface of the housing having the first opening. With this arrangement, the situation where the top cover protrudes relative to the housing can be further reduced, and the overall volume of the battery module is further reduced.

[0024] In some embodiments of the present application, a mating structure is provided on the side surface of the top cover facing the housing. The mating structure is arranged along the circumference of the first opening of the receiving groove, and one end of the housing having the first opening is in concave-convex fit with the mating structure. With this arrangement, the positioning between the top cover and the housing can be achieved, thereby improving the position accuracy during the welding process and further improving the product quality of the battery module.

[0025] In some embodiments of the present application, an embedding groove is formed on the side surface of the top cover facing the housing. The embedding groove constitutes the mating structure. One side wall of the embedding groove is in through connection with the edge of the top cover. One end of the housing having the first opening is embedded in the embedding groove. Among them, a part of the body of the top cover is embedded in the first opening of the receiving groove, and the other part of the body of the top cover is located outside the first opening of the receiving groove. With this arrangement, the structure is simple and convenient for processing and manufacturing, and the manufacturing cost can be effectively reduced.

[0026] In some embodiments of the present application, along the direction parallel to the top surface of the top cover, the width of the embedding groove is in the range of 0.2 mm to 3 mm. With this arrangement, the positioning effect during the assembly of the top cover can be improved, and the assembly accuracy of the battery module is improved.

[0027] In some embodiments of the present application, the width is in the range of 0.4 mm to 1.5 mm. With this arrangement, while meeting the fit between the top cover and the housing, the positioning effect during the assembly of the top cover can be further improved, and the assembly accuracy of the battery module is improved.

[0028] In some embodiments of the present application, along the direction perpendicular to the top surface of the top cover, the depth of the embedding groove is in the range of 0.1 mm to 2 mm. With this arrangement, the top cover and the housing can have an embedding depth, thereby improving the positioning effect on the top cover and further improving the welding accuracy during the welding process.

[0029] In some embodiments of the present application, the depth is in the range of 0.3 mm to 1 mm. With this arrangement, while improving the welding accuracy between the top cover and the housing, the occupation of the dimension in the thickness direction of the top cover is reduced, and the influence on the structural strength of the top cover is reduced.

[0030] In some embodiments of the present application, an insulating structure is provided between the inner wall of the receiving groove and the electrode assembly, and the insulating structure includes at least one of an insulating coating, an insulating electrophoresis layer, and an insulating component.

[0031] With such a setting, effective insulation can be achieved between the electrode assembly and the housing, improving the safety performance of the battery module.

[0032] In some embodiments of the present application, the housing is an integral structure. With such a setting, the processing procedures can be reduced, and the processing efficiency can be lowered.

[0033] In some embodiments of the present application, the housing includes a housing body and a plugging member. The housing body is provided with a plurality of channels arranged along a second direction. One port of the channel forms a first opening, and the other port of the channel forms a second opening. The plugging member is connected to the housing body, and the plugging member closes the second opening and encloses a receiving groove with the housing body. With such a setting, the processing difficulty of the housing can be reduced, and the processing cost can be lowered.

[0034] In some embodiments of the present application, adjacent two battery modules are connected by a buffer pad and / or structural adhesive. With such a setting, a plurality of battery modules can be connected in a first direction, further improving the overall stiffness of the battery device.

[0035] In some embodiments of the present application, the connecting structure includes a buffer pad or structural adhesive. With such a setting, on the basis of realizing the connection of adjacent two battery modules, the manufacturing cost can be effectively reduced.

[0036] A second aspect of the present application provides an electrical device, and the electrical device includes the battery device as above.

[0037] In the present application, a plurality of battery modules are arranged along a first direction inside the box body of the battery device. Each battery module forms a plurality of battery cells along a second direction, and the plurality of battery cells share a common housing, thereby improving the overall rigidity of the battery device in the second direction and reducing the damage of the battery device caused by external impacts.

[0038] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. Description of the Drawings

[0039] Figure 1 Schematically shows a structural diagram of a vehicle according to an embodiment of the present application;

[0040] Figure 2 Schematically shows a schematic structural diagram of a battery device according to an embodiment of the present application;

[0041] Figure 3 Schematically shows a schematic structural diagram of a battery module according to an embodiment of the present application;

[0042] Figure 4 is Figure 3 A cross-sectional view taken at the A-A position of the battery module shown;

[0043] Figure 5 is Figure 4 An enlarged structural diagram of part B of the battery cell shown;

[0044] Figure 6 Schematically shows a schematic structural diagram of a battery module according to an embodiment of the present application;

[0045] Figure 7 is Figure 6 A cross-sectional view taken at the C-C position of the battery module shown;

[0046] Figure 8 is Figure 7 An enlarged structural diagram of part D of the battery module shown;

[0047] Figure 9 is Figure 2 An exploded structural diagram of the battery module shown in;

[0048] Figure 10 is Figure 9 A schematic structural diagram of another embodiment of the housing in the battery module shown in;

[0049] The reference numerals are as follows:

[0050] 1000, vehicle;

[0051] 100, battery device; 200, controller; 300, motor;

[0052] 10, battery module;

[0053] 11, outer shell;

[0054] 111, housing; 1111, receiving groove; 1112, first opening; 1113, housing body; 1114, plugging member; 1115, channel; 112, cover body; 1121, top cover; 11211, embedding groove;

[0055] 12, electrode terminal;

[0056] 121, first electrode terminal; 122, second electrode terminal;

[0057] 13. Pressure relief mechanism;

[0058] 14. Battery unit;

[0059] 15. Electrode assembly;

[0060] 16. Accommodating cavity;

[0061] 20. Box body;

[0062] 21. First part; 22. Second part; 23. Accommodating space;

[0063] X. First direction; Y. Second direction; Z. Third direction; a. First distance; b. Width; c. Depth. Detailed implementation manners

[0064] 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, so they are only examples and cannot be used to limit the protection scope of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" 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 this application, "a plurality of" means more than two unless otherwise specifically defined.

[0067] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions 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 explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0070] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0072] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0073] In the related art, the overall rigidity of the battery device is poor, and it is easy to cause damage to the battery device when subjected to external impacts.

[0074] In this application, the battery device includes a box body and a plurality of battery modules. The box body has an accommodation space, and the plurality of battery modules are arranged in the accommodation space and arranged in a first direction. Among them, each battery module includes a housing and a plurality of electrode assemblies. The housing includes a plurality of accommodation cavities, and the plurality of accommodation cavities are arranged in a second direction and are not communicated with each other. Each accommodation cavity is respectively provided with an electrode assembly, and the plurality of accommodation cavities and the electrode assemblies therein respectively form a plurality of battery cells. One of the first direction and the second direction is the length direction of the battery device, and the other of the first direction and the second direction is the width direction of the battery device. The plurality of battery modules are arranged in the first direction inside the box body, and each battery module forms a plurality of battery cells in the second direction. The plurality of battery cells share one housing, so that the overall rigidity of the battery device can be improved in the second direction, and the situation of damage to the battery device caused by external impact is reduced.

[0075] The battery involved in the embodiments of this application can be used, but is not limited to, power-consuming devices such as vehicles, ships or aircraft. The power supply system of the power-consuming device can be composed of the battery monomers and batteries involved in this application.

[0076] In addition, the power-consuming devices using the battery as the power source can be, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, energy storage cabinets, and so on. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0077] The technical solutions described in the embodiments of this application are not only limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of brevity of description, the following embodiments are all described by taking electric vehicles as examples.

[0078] For example, as Figure 1As shown in the figure, it is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 300, a controller 200 and a battery device 100 can be arranged inside the vehicle 1000. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front or the rear 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 and applied to the circuit system of the vehicle 1000, such as for the working power requirements during the start, navigation and operation of the vehicle 1000. In another embodiment 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 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0079] As Figure 2 shown, the battery device 100 can include a plurality of battery modules 10 and a box body 20. The plurality of battery modules 10 are accommodated inside the box body 20.

[0080] In order to meet different power usage requirements, the battery module 10 can be the smallest unit of the battery device 100 or an integrated structure of a plurality of battery cells 14 (the smallest charge and discharge unit inside the battery device 100). Taking the integrated structure of the battery module as a plurality of battery cells 14 as an example, a busbar component is used to realize the electrical connection between the plurality of battery cells 14 for various application scenarios, such as parallel connection, series connection or mixed connection. Specifically, the busbar component can realize the electrical connection between the plurality of battery cells 14 by connecting the electrode lead-out parts of the plurality of battery cells 14. The battery cell 14 can include, but is not limited to, a lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc. In addition, the shape of the battery module 10 includes, but is not limited to, a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0081] The box body 20 is used to accommodate the battery module 10 to reduce the influence of liquid or other foreign objects on the charging or discharging of the battery module 10. The box body 20 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder or sphere, etc. The material of the box body 20 can be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin, etc.

[0082] As Figure 2As shown, the box body 20 may include a first part 21 and a second part 22. The first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a space for accommodating the battery module 10. The second part 22 may be a hollow structure with one end open, and the first part 21 may be a plate-like structure. The first part 21 covers the open side of the second part 22 so that the first part 21 and the second part 22 jointly define a space for accommodating the battery module 10. The first part 21 and the second part 22 may also both be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22.

[0083] In some embodiments of the present application, as Figures 2 to 10 shown, a battery device 100 is proposed. The battery device 100 includes a box body 20 and a plurality of battery modules 10. The box body 20 has an accommodation space 23, and the plurality of battery modules 10 are arranged in the accommodation space 23 and arranged in the first direction X. Among them, the battery module 10 includes a housing 11 and a plurality of electrode assemblies 15. The housing 11 includes a plurality of accommodation cavities 16. The plurality of accommodation cavities 16 are arranged in the second direction Y and are not communicated with each other. Each accommodation cavity 16 is respectively provided with an electrode assembly 15. The plurality of accommodation cavities 16 and the electrode assemblies 15 therein respectively form a plurality of independent battery cells 14. One of the first direction X and the second direction Y is the length direction of the battery device 100, and the other of the first direction X and the second direction Y is the width direction of the battery device 100.

[0084] It should be understood that in the present application, the battery device 100 is a cuboid structure. Among them, the cuboid structure includes a length direction, a width direction, and a height direction, and the length direction, the width direction, and the height direction are perpendicular to each other.

[0085] In the present application, one of the first direction X and the second direction Y is the length direction of the battery device 100, and the other is the width direction of the battery. For example, the first direction X is the length direction of the battery device 100, and the second direction Y is the width direction of the battery device 100. In addition, the third direction Z in the present application is the height direction of the battery device 100.

[0086] In addition, the shape of the box body 20 is consistent with the shape of the battery device 100. The accommodation space 23 in the box body 20 is a cuboid space, and this space is a closed structure. After the plurality of battery modules 10 are arranged in the accommodation space 23, the outside is isolated from the plurality of battery modules 10 by the box body 20 to reduce the adverse effects of the external environment on the battery modules 10.

[0087] A plurality of battery modules 10 are arranged in the accommodation space 23 of the box body 20. The plurality of battery modules 10 are arranged in the first direction X to form the structure of a battery assembly. The accommodation space 23 in the box body 20 may include the structures of a plurality of battery assemblies. The plurality of battery assemblies may be arranged in the second direction Y, may also be arranged in the third direction Z, or may be arranged both in the second direction Y and in the third direction Z.

[0088] In this application, the outer shell 11 is of a rigid shell structure, that is, the outer shell 11 has a certain structural strength so as to be able to maintain its shape. An accommodation cavity 16 is provided in the outer shell 11. The number of the accommodation cavities 16 is plural (specifically, it may be two, three, four, five, six, seven, eight, etc.), and the plurality of accommodation cavities 16 are arranged in the second direction Y. The plurality of accommodation cavities 16 are non-connecting structures, that is, one accommodation cavity 16 is not connected to any other accommodation cavity 16, and each accommodation cavity 16 is an independent chamber.

[0089] The accommodation cavity 16 in the outer shell 11 is used to accommodate the electrode assembly 15. The number of the electrode assemblies 15 in each accommodation cavity 16 may be one or plural. The shape of the accommodation cavity 16 may be determined according to the shape of one or a combination of a plurality of electrode assemblies 15. For example, the accommodation space 23 is a cuboid. The embodiments of this application include but are not limited to this. The accommodation space 23 may also be a cube, a cylinder or other shapes.

[0090] The material of the outer shell 11 may be various. For example, the material of the outer shell 11 may be metal or plastic. As some examples, the material of the outer shell 11 may be copper, iron, aluminum, steel, aluminum alloy, etc.

[0091] In addition, the processing method of the outer shell 11 may be an integrally formed structure (such as injection molding, casting, die casting, extrusion, etc.), or may be formed by assembling components (such as sheet metal welding, etc.).

[0092] In this application, the electrode assembly 15 is disposed in the accommodation cavity 16 of the housing 11. The electrode assembly 15 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cells 14 of the battery module 10 mainly operate by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The current collector without the coated positive electrode active material layer serves as the positive electrode tab. Taking the lithium-ion battery module 10 as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The current collector without the coated negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to allow a large current to pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly 15 can be a wound structure or a stacked structure, and the embodiments of this application are not limited thereto.

[0093] The tabs can be provided in multiple numbers. The multiple tabs include positive electrode tabs and negative electrode tabs. The positive electrode tabs and the negative electrode tabs can be led out from the same side of the electrode assembly 15 or from different sides of the electrode assembly 15.

[0094] At least one electrode terminal 12 is provided on the housing 11, and the electrode terminal 12 is electrically connected to the tab. The electrode terminal 12 can be directly connected to the tab or indirectly connected to the tab through a current collecting member.

[0095] In this application, inside the box body 20, multiple battery modules 10 are arranged in the first direction X. Each battery module 10 forms multiple battery cells 14 in the second direction Y. The multiple battery cells 14 share one housing 11, so that the overall rigidity of the battery device 100 can be improved in the second direction Y, and the situation of damage to the battery device 100 caused by external impact is reduced.

[0096] In some embodiments of this application, as Figure 9 shown, the housing 11 includes a housing body 111 and a cover body 112. The housing body 111 is provided with multiple accommodation grooves 1111 having a first opening 1112. The accommodation grooves 1111 are arranged in the second direction Y. The cover body 112 is connected to the housing body 111 and closes the first opening 1112 of each accommodation groove 1111. The cover body 112 and the accommodation groove 1111 enclose the accommodation cavity 16.

[0097] The shape of the housing 111 is a cuboid, a cube, a cylinder or other structures. Hereinafter, taking the housing 111 as a cuboid as an example for specific description:

[0098] It should be understood that the cuboid-shaped housing 111 is convenient for positioning during the assembly process, and is convenient for layout and installation in the box body 20, which can reduce the waste of space in the box body 20 and improve the energy density of the battery device 100.

[0099] A plurality of receiving grooves 1111 are provided on the housing 111 (the number can be specifically two, three, four, five, six, seven or eight, etc.). The plurality of receiving grooves 1111 are arranged in the second direction Y, and adjacent two receiving grooves 1111 are separated from each other by a partition structure. The shape of the receiving groove 1111 is adapted to the shape of the electrode assembly 15. For example, when the electrode assembly 15 is a cuboid structure, the receiving groove 1111 at this time is also a cuboid structure.

[0100] Along the third direction Z (the height direction of the battery device 100), a first opening 1112 is provided at the top of the receiving groove 1111. During assembly, first, the electrode assembly 15 is assembled into the receiving groove 1111, and then the cover body 112 is connected to the top of the housing 111. After connection, the cover body 112 closes the first opening 1112 of the receiving groove 1111 to isolate the electrode assembly 15 from the outside, thereby forming a plurality of independent battery units 14.

[0101] The receiving groove 1111 can be integrally formed with the housing 111 or formed by subsequent processing (such as milling machine processing, etc.). For example, when the receiving groove 1111 is integrally formed with the housing 111, the processing procedures can be reduced and the processing efficiency can be improved. For example, when the receiving groove 1111 is formed on the housing 111 by subsequent processing, the processing difficulty can be reduced and the manufacturing cost can be reduced.

[0102] The cover body 112 can be a plate-shaped member or a block-shaped member with a mating structure. For example, the cover body 112 is a plate-shaped member. The structure of the plate-shaped member is simple, which is convenient for processing and manufacturing. Corresponding mounting structures can be provided on the plate-shaped member to meet the mounting requirements of other components of the battery module 10.

[0103] In this application, the outer shell 11 is set as a combined structure of the cover body 112 and the housing 111, so as to facilitate the assembly of the electrode assembly 15 into the receiving cavity 16, thereby improving the assembly convenience.

[0104] It should be noted that the connection method between the cover body 112 and the housing 111 includes but is not limited to snap connection, welding or connection through a connecting member, etc.

[0105] In addition, the cover body 112 and the housing 111 can be made of the same material or different materials. At the same time, the materials of the cover body 112 and the housing 111 can both be metal parts or non-metal parts, or one of the cover body 112 and the housing 111 is a metal part and the other is a non-metal part.

[0106] In addition, the structure of the cover body 112 can be an integral structure (that is, the integral structure simultaneously closes the first openings 1112 of all the receiving grooves 1111), or a split structure (that is, it includes multiple parts, and each part closes the first opening 1112 of a receiving groove 1111).

[0107] In some embodiments of the present application, as Figure 9 shown, the cover body 112 includes a plurality of top covers 1121. The plurality of top covers 1121 are arranged corresponding to the plurality of receiving grooves 1111, and the plurality of top covers 1121 are arranged in a row along the second direction Y and are all connected to the housing 111. The top cover 1121 is used to close the first opening 1112 of the corresponding receiving groove 1111.

[0108] Specifically, due to manufacturing processes and equipment, manufacturing tolerances are likely to occur during the manufacturing process. Under the influence of manufacturing tolerances, when all the first openings 1112 of the receiving grooves 1111 are closed by an integral cover plate, problems such as poor contact or interference are likely to occur, which will affect the assembly accuracy of the cover body 112 and the housing 111, and may result in poor sealing.

[0109] In the present application, the cover body 112 is provided as a plurality of top covers 1121, and the top covers 1121 are used to connect to the housing 111 to close the openings of the receiving grooves 1111, thereby reducing the situation where the cover body 112 fails to tightly seal the first openings 1112 due to manufacturing tolerances and other reasons, and improving the sealing performance of the receiving cavity 16.

[0110] In some embodiments of the present application, both the housing 111 and the top cover 1121 are metal parts. Along the second direction Y, any two adjacent top covers 1121 are spaced apart, and the electrode assembly 15 is insulated from both the housing 111 and the top cover 1121.

[0111] Specifically, by setting the housing 111 and the top cover 1121 as metal parts, the structural strength of the outer shell 11 can be improved, thereby improving the impact resistance of the battery module 10 and further enhancing the overall rigidity of the battery device 100.

[0112] It should be noted that the metal parts can be aluminum parts, copper parts, steel parts, etc. For example, the top cover 1121 and the housing 111 are both aluminum parts. Aluminum parts are lightweight and can effectively reduce the weight of the battery module 10, enabling the overall mass of the battery device 100 to be reduced. At the same time, the manufacturing cost of aluminum parts is low, which can effectively reduce the manufacturing cost of the battery module 10, and also effectively reduce the manufacturing cost of the battery device 100.

[0113] In addition, the battery module 10 further includes electrode terminals 12. The electrode terminals 12 include a first electrode terminal 121, a second electrode terminal 122, and a pressure relief mechanism 13. Among them, the first electrode terminal 121 and the second electrode terminal 122 can be jointly arranged on the top cover 1121 and are respectively electrically connected to the electrode assembly 15. The first electrode terminal 121 and the second electrode terminal 122 can be simultaneously arranged on the side walls of the housing 111 and the top cover 1121 that are oppositely arranged and are respectively electrically connected to the electrode assembly 15. The first electrode terminal 121 and the second electrode terminal 122 can also be arranged, one on the top cover 1121 and electrically connected to the electrode assembly 15, and the other on the side wall of the housing 111 that is oppositely arranged with the top cover 1121 and electrically connected to the electrode assembly 15.

[0114] The pressure relief mechanism 13 can be arranged on the same surface as the electrode terminals or on different surfaces.

[0115] In some embodiments of the present application, the top cover 1121 and the housing 111 are fixedly connected by welding.

[0116] Specifically, the housing 11 of the battery module 10 includes a housing 111 and a cover body 112. The cover body 112 includes a plurality of top covers 1121. The number of top covers 1121 is the same as the number of receiving grooves 1111 on the housing 111. Each top cover 1121 is connected to the housing 111 by welding (such as laser welding. The laser welding method has high precision and is easy to implement, and can effectively improve the welding quality) to close the first opening 1112 of the receiving groove 1111, so as to enclose a receiving cavity 16 for arranging the electrode assembly 15 by the top cover 1121 and the receiving groove 1111.

[0117] Both the housing 111 and the top cover 1121 are metal parts. The welded and fixed connection method is convenient for processing. At the same time, the structural strength of the connection position is relatively high. In addition, it can improve the sealing performance of the receiving cavity 16.

[0118] In some embodiments of the present application, the weld seam between the top cover 1121 and the housing 111 is arranged along the circumference of the first opening 1112 of the receiving groove 1111 and surrounds the first opening 1112 for one week.

[0119] Specifically, the housing 11 of the battery module 10 includes a housing body 111 and a cover body 112. The cover body 112 includes a plurality of top covers 1121. The number of the top covers 1121 is the same as the number of the receiving grooves 1111 on the housing body 111. Both the housing body 111 and the top covers 1121 are metal parts. Each top cover 1121 is connected to the housing body 111 by welding (such as laser welding, which has high precision and is easy to implement, and can effectively improve the welding quality) to close the first opening 1112 of the receiving groove 1111, so as to enclose a receiving cavity 16 for arranging the electrode assembly 15 by the top cover 1121 and the receiving groove 1111.

[0120] The weld between the cover and the housing body 111 is arranged along the circumferential direction of the first opening 1112 of the receiving groove 1111 and surrounds the first opening 1112. Such an arrangement can further improve the structural strength of the connection position and the sealing performance of the receiving cavity 16.

[0121] In some embodiments of the present application, as Figure 3 or Figure 6 shown, along the second direction Y, there is a first distance a between two adjacent top covers 1121, and the first distance a is in the range of 2 mm to 15 mm.

[0122] Specifically, the housing 11 of the battery module 10 includes a housing body 111 and a cover body 112. The cover body 112 includes a plurality of top covers 1121. The number of the top covers 1121 is the same as the number of the receiving grooves 1111 on the housing body 111. Both the housing body 111 and the top covers 1121 are metal parts. Each top cover 1121 is connected to the housing body 111 by welding (such as laser welding, which has high precision and is easy to implement, and can effectively improve the welding quality) to close the first opening 1112 of the receiving groove 1111, so as to enclose a receiving cavity 16 for arranging the electrode assembly 15 by the top cover 1121 and the receiving groove 1111.

[0123] During the welding process, heat is generated. By setting the first distance a, the isolation of the welding heat is realized, the influence on the adjacent top covers 1121 during the welding process of the top cover 1121 and the housing body 111 is reduced, and the product quality of the battery module 10 is improved.

[0124] It should be noted that the first distance a can specifically be 2 mm, 3 mm, 4 mm, 4.9 mm, 5.9 mm, 6.9 mm, 7.9 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0125] In some embodiments of the present application, as Figure 3 or Figure 6 shown, the first distance a is in the range of 5 mm to 8 mm.

[0126] Specifically, the first distance a is further set. On the basis of having an effective spacing space between two adjacent top covers 1121, by controlling the first distance a, the occupation of the size of the battery module 10 in the second direction Y can be reduced, thereby reducing the influence on the energy density of the battery device 100.

[0127] It should be noted that the first distance a can specifically be 5 mm, 6 mm, 7 mm, 8 mm, etc.

[0128] In some embodiments of the present application, the top cover 1121 is provided outside the first opening 1112 of the receiving groove 1111 and abuts against the housing 111.

[0129] Specifically, the outer shell 11 of the battery module 10 includes a housing 111 and a cover body 112. The cover body 112 includes a plurality of top covers 1121. The number of top covers 1121 is the same as the number of receiving grooves 1111 on the housing 111. Both the housing 111 and the top covers 1121 are metal parts. Each top cover 1121 is connected to the housing 111 by welding (such as laser welding. The laser welding method has high precision and is easy to implement, and can effectively improve the welding quality) to close the first opening 1112 of the receiving groove 1111, so as to enclose a receiving cavity 16 for arranging the electrode assembly 15 by using the top cover 1121 and the receiving groove 1111.

[0130] During the welding process, the top cover 1121 is abutted against the end of the housing 111 having the first opening 1112, and the position of the top cover 1121 is positioned by a positioning device, and then welding is performed along the joint position between the top cover 1121 and the housing 111 on the outer peripheral side of the housing 111. With such a setting, it is convenient to position the top cover 1121 during the assembly process, and the convenience of the assembly process can be improved.

[0131] In some embodiments of the present application, as Figure 4 and Figure 5 shown, the top cover 1121 is embedded in the first opening 1112 of the receiving groove 1111, and the circumferential edge of the top cover 1121 abuts against the inner wall of the receiving groove 1111.

[0132] Specifically, the housing 11 of the battery module 10 includes a housing body 111 and a cover body 112. The cover body 112 includes a plurality of top covers 1121. The number of the top covers 1121 is the same as that of the receiving grooves 1111 on the housing body 111. Both the housing body 111 and the top covers 1121 are metal parts. Each top cover 1121 is connected to the housing body 111 by welding (such as laser welding, which has high precision and is easy to implement, and can effectively improve the welding quality), so as to close the first opening 1112 of the receiving groove 1111, thereby enclosing a receiving cavity 16 for arranging the electrode assembly 15 with the receiving groove 1111 by the top cover 1121.

[0133] During the welding process, the top cover 1121 is embedded in the first opening 1112 of the receiving groove 1111, so that the circumferential edge of the top cover 1121 abuts against the inner wall of the receiving groove 1111, and the position of the top cover 1121 is maintained. Then, the welding equipment welds the joint position between the top cover 1121 and the housing body 111 along the circumferential direction of the first opening 1112. With such a setting, the situation that the top cover 1121 protrudes relative to the housing body 111 can be reduced, thereby effectively reducing the overall volume of the battery module 10.

[0134] It should be noted that a counterbore structure can be arranged at the position of the first opening 1112 of the receiving groove 1111. The top cover 1121 abuts against the counterbore structure, and the counterbore structure supports the top cover 1121, thereby realizing the positioning of the top cover 1121. Furthermore, the installation accuracy of the top cover 1121 can be improved, and the quality of the battery module 10 is thus enhanced.

[0135] In some embodiments of the present application, as Figure 4 and Figure 5 shown, the side surface of the top cover 1121 facing away from the receiving cavity 16 is flush with the outer surface of the housing body 111 having the first opening 1112. Specifically, the top cover 1121 is embedded in the first opening 1112 of the receiving groove 1111, the circumferential edge of the top cover 1121 abuts against the inner wall of the receiving groove 1111, and the joint position between the top cover 1121 and the housing body 111 is welded by welding. The side surface of the top cover 1121 facing away from the receiving cavity 16 is flush with the outer surface of the housing body 111 having the first opening 1112. With such a setting, the situation that the top cover 1121 protrudes relative to the housing body 111 can be further reduced, and the overall volume of the battery module 10 is further reduced.

[0136] In some embodiments of the present application, as Figure 7 and Figure 8 shown, the side surface of the top cover 1121 facing the housing body 111 is provided with a matching structure. The matching structure is arranged along the circumferential direction of the first opening 1112 of the receiving groove 1111, and the end of the housing body 111 having the first opening 1112 is in concave-convex fit with the matching structure.

[0137] Specifically, one end of the housing 111 having the first opening 1112 and the side surface of the top cover 1121 facing the housing 111 are assembled in a concave-convex fitting manner, and the top cover 1121 and the housing 111 are connected and fixed by welding. With such a setting, positioning between the top cover 1121 and the housing 111 can be achieved, thereby improving the positional accuracy during the welding process, and further improving the product quality of the battery module 10.

[0138] In addition, the concave-convex fitting between the housing 111 and the top cover 1121 can increase the contact area between the top cover 1121 and the housing 111, thereby improving the connection strength and stability between the top cover 1121 and the housing 111.

[0139] It should be understood that the concave-convex fitting between the housing 111 and the top cover 1121 means that a concave structure is formed on one of the housing 111 and the top cover 1121, and the other is embedded into the concave structure to form an embedded structure.

[0140] In some embodiments of the present application, as Figure 7 and Figure 8 shown, an embedding groove 11211 is provided on the side surface of the top cover 1121 facing the housing 111. One side wall of the embedding groove 11211 is communicated with the edge of the top cover 1121. One end of the housing 111 having the first opening 1112 is embedded in the embedding groove 11211. Among them, a part of the body of the top cover 1121 is embedded in the first opening 1112 of the receiving groove 1111, and the other part of the body of the top cover 1121 is located outside the first opening 1112 of the receiving groove 1111.

[0141] Specifically, an embedding groove 11211 is provided on the side surface of the top cover 1121 facing the housing 111. The embedding groove 11211 is provided close to the edge of the top cover 1121 and is communicated with the edge of the top cover 1121, so that the edge of the top cover 1121 has an L-shaped structure.

[0142] When the top cover 1121 and the housing 111 are assembled, the side of the top cover 1121 having the embedding groove 11211 faces the side of the housing 111 having the first opening 1112, and one end of the housing 111 having the first opening 1112 is embedded into the embedding groove 11211 and is in contact with the bottom surface of the embedding groove 11211 (the surface of the embedding groove 11211 facing the housing 111). Then, the top cover 1121 and the housing 111 are welded and fixed by welding. With such a setting, the structure is simple, convenient for processing and manufacturing, and can effectively reduce the manufacturing cost.

[0143] It should be understood that when welding the housing 111 and the top cover 1121, first move the welding device along the circumferential direction of the housing 111. During the moving process, weld the connection positions between the outer sides of all the top covers 1121 (except the side of the top cover 1121 facing the adjacent top cover 1121) and the housing 111, and then perform supplementary welding on the connection positions between the inner sides of the top covers 1121 (the side of the top cover 1121 facing the adjacent top cover 1121) and the housing 111. In this way, the welding efficiency can be improved, and the production rhythm can be accelerated.

[0144] In some embodiments of the present application, as Figure 8 shown, along the direction parallel to the top surface of the top cover 1121, the width b of the embedding groove 11211 is in the range of 0.2 mm to 3 mm. Specifically, by setting the width b of the embedding groove 11211 in the range of 0.2 mm to 3 mm, such a setting can improve the positioning effect during the assembly of the top cover 1121, and improve the assembly accuracy of the battery module 10.

[0145] It should be noted that the width b of the embedding groove 11211 can specifically be 0.2 mm, 0.3 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, etc.

[0146] In some embodiments of the present application, the width b is in the range of 0.4 mm to 1.5 mm. Specifically, further setting the width b of the embedding groove 11211 in the range of 0.4 mm to 1.5 mm can, while meeting the cooperation between the top cover 1121 and the housing 111, further improve the positioning effect during the assembly of the top cover 1121, and improve the assembly accuracy of the battery module 10.

[0147] It should be noted that the width b of the embedding groove 11211 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0148] In some embodiments of the present application, as Figure 8 shown, along the direction perpendicular to the top surface of the top cover 1121, the depth c of the embedding groove 11211 is in the range of 0.1 mm to 2 mm. Specifically, by setting the depth c of the embedding groove 11211 in the range of 0.1 mm to 2 mm, such a setting can enable the top cover 1121 and the housing 111 to have an embedding depth c, thereby improving the positioning effect on the top cover 1121, and further improving the welding accuracy during the welding process.

[0149] It should be noted that the depth c of the embedding groove 11211 can specifically be 0.1 mm, 0.2 mm, 1.1 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0150] In some embodiments of the present application, as Figure 8 shown, the depth c is in the range of 0.3 mm to 1 mm. Specifically, by setting the depth c of the embedding groove 11211 in the range of 0.3 mm to 1 mm, such a setting can improve the welding accuracy between the top cover 1121 and the housing 111 while reducing the occupation of the size in the thickness direction of the top cover 1121 and reducing the influence on the structural strength of the top cover 1121.

[0151] It should be noted that the depth c of the embedding groove 11211 can specifically be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0152] In some embodiments of the present application, an insulating structure is provided between the inner wall of the accommodating groove 1111 and the electrode assembly 15, and the insulating structure includes at least one of an insulating coating, an insulating electrophoretic layer, and an insulating component.

[0153] Specifically, an insulating structure is provided between the inner wall of the accommodating groove 1111 and the electrode assembly 15, and the insulating structure is further arranged. Such a setting can effectively insulate the electrode assembly 15 from the housing 111, thereby improving the safety performance of the battery module 10.

[0154] In some embodiments of the present application, as Figure 9 shown, the housing 111 is an integral structure.

[0155] Specifically, such a setting can reduce the processing procedures and lower the processing efficiency.

[0156] It should be noted that since the housing 111 is an integral structure, it can be processed and manufactured by means of casting, extrusion, 3D printing, etc. For example, if the housing 111 is made of an aluminum alloy, it can be formed by extrusion, thereby reducing the processing procedures and improving the processing efficiency.

[0157] In some embodiments of the present application, as Figure 10As shown, the housing 111 includes a housing body 1113 and a plugging member 1114. A plurality of channels 1115 are formed in the housing body 1113. The plurality of channels 1115 are arranged along the second direction Y. One port of the channel 1115 constitutes a first opening 1112, and the other port of the channel 1115 constitutes a second opening. The plugging member 1114 is connected to the housing body 1113. The plugging member 1114 closes the second opening and encloses a receiving groove 1111 with the housing body 1113.

[0158] Specifically, by setting the housing 111 into an assembled structure of the housing body 1113 and the plugging member 1114, the processing difficulty of the housing 111 can be reduced, and the processing cost can be reduced.

[0159] It should be noted that the housing 111 is a split structure, specifically formed by combining the housing body 1113 and the plugging member 1114. The plugging member 1114 can be a plate-like member and the number is multiple. The connection manner between the plugging member 1114 and the housing body 1113 includes but is not limited to welding, clamping, bonding or connection through a connecting member, etc.

[0160] For example, both the housing body 1113 and the plugging member 1114 are made of aluminum and can be processed and manufactured by means such as casting, extrusion, 3D printing, etc. For example, the housing 111 is made of aluminum alloy, the housing body 1113 is a frame structure (with a plurality of channels 1115), the plugging member 1114 is a plate-like member, and is fixedly connected to the housing body 1113 by welding (the structure at the connection position between the plugging member 1114 and the housing body 1113 can refer to the structure at the connection position between the top cover 1121 and the housing 111).

[0161] In some embodiments of the present application, the battery device 100 further includes a connection structure. Adjacent two battery modules 10 are connected through the connection structure.

[0162] Specifically, by connecting two adjacent battery cells 14 through the connection structure, a plurality of battery modules 10 can be connected in the first direction X, thereby further improving the overall stiffness of the battery device 100.

[0163] In some embodiments of the present application, the connection structure includes at least one of a buffer pad and a structural adhesive. Specifically, by setting the connection structure as a buffer pad or a structural adhesive, on the basis of realizing the connection of adjacent two battery modules 10, the manufacturing cost can be effectively reduced.

[0164] A second aspect of the present application provides an electrical device, and the electrical device includes the battery device 100 as above.

[0165] In this application, a plurality of battery modules 10 are arranged in the first direction X inside the box body 20 of the battery device 100. Each battery module 10 forms a plurality of battery cells 14 in the second direction Y. The plurality of battery cells 14 share a single outer shell 11, thereby enabling the overall rigidity of the battery device 100 to be improved in the second direction Y and reducing the damage to the battery device 100 caused by external impacts.

[0166] The above description is only an overview of the technical solution of this application. In order to be able to more clearly understand the technical means of this application, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically exemplified below.

[0167] In an embodiment of this application, as Figures 2 to 10 shown, this application proposes a battery device 100. The battery device 100 includes a box body 20 and a plurality of battery modules 10. The box body 20 has a receiving space 23. The plurality of battery modules 10 are arranged in the receiving space 23 and are arranged in the first direction X. Among them, the battery module 10 includes an outer shell 11 and a plurality of electrode assemblies 15. The outer shell 11 includes a plurality of receiving cavities 16. The plurality of receiving cavities 16 are arranged in the second direction Y and are not connected to each other. Each receiving cavity 16 is respectively provided with an electrode assembly 15. The plurality of receiving cavities 16 and the electrode assemblies 15 therein respectively form a plurality of independent battery cells 14. One of the first direction X and the second direction Y is the length direction of the battery device 100, and the other of the first direction X and the second direction Y is the width direction of the battery device 100.

[0168] Furthermore, the outer shell 11 includes a housing 111 and a cover 112. The housing 111 is provided with a plurality of receiving grooves 1111 having a first opening 1112. The receiving grooves 1111 are arranged in the second direction Y. The cover 112 is connected to the housing 111 and closes the first openings 1112 of the respective receiving grooves 1111. The cover 112 and the receiving grooves 1111 enclose the receiving cavities 16.

[0169] Among them, the cover 112 includes a plurality of top covers 1121. The plurality of top covers 1121 are arranged corresponding to the plurality of receiving grooves 1111. The plurality of top covers 1121 are arranged in the second direction Y and are all connected to the housing 111. Each top cover 1121 is used to close the first opening 1112 of a receiving groove 1111.

[0170] In addition, both the housing 111 and the top cover 1121 are metal parts. Along the second direction Y, any two adjacent top covers 1121 are spaced apart. The electrode assembly 15 is insulated from both the housing 111 and the top cover 1121. The top cover 1121 is fixedly welded to the housing 111. The weld seam between the top cover 1121 and the housing 111 is arranged along the circumference of the first opening 1112 of the receiving groove 1111 and surrounds the entire circumference of the first opening 1112. Along the second direction Y, there is a first distance a between two adjacent top covers 1121, and the first distance a is in the range of 5 millimeters to 8 millimeters.

[0171] Further, the top cover 1121 can be arranged outside the first opening 1112 of the receiving groove 1111 and abutted against the housing 111.

[0172] Further, the top cover 1121 can also be embedded in the first opening 1112 of the receiving groove 1111, and the circumferential edge of the top cover 1121 abuts against the inner wall of the receiving groove 1111. The side surface of the top cover 1121 facing away from the receiving cavity 16 is flush with the outer surface of the housing 111 having the first opening 1112. With such an arrangement, the situation where the top cover 1121 protrudes relative to the housing 111 can be further reduced, and the overall volume of the battery module 10 is further reduced.

[0173] Further, the top cover 1121 can also be provided with a mating structure on the side surface facing the housing 111. The mating structure is arranged along the circumference of the first opening 1112 of the receiving groove 1111, and one end of the housing 111 having the first opening 1112 is in concave-convex mating with the mating structure. An embedding groove 11211 is formed on the side surface of the top cover 1121 facing the housing 111. The embedding groove 11211 is the mating structure. One side wall of the embedding groove 11211 is in through connection with the edge of the top cover 1121. One end of the housing 111 having the first opening 1112 is embedded in the embedding groove 11211. Among them, a part of the body of the top cover 1121 is embedded in the first opening 1112 of the receiving groove 1111, and another part of the body of the top cover 1121 is located outside the first opening 1112 of the receiving groove 1111. Along the direction parallel to the top surface of the top cover 1121, the width b of the embedding groove 11211 is in the range of 0.4 millimeters to 1.5 millimeters. Along the direction perpendicular to the top surface of the top cover 1121, the depth c of the embedding groove 11211 is in the range of 0.3 millimeters to 1 millimeter.

[0174] Further, an insulating structure is provided between the inner wall of the receiving groove 1111 and the electrode assembly 15. The insulating structure includes at least one of an insulating coating, an insulating electrophoretic layer, and an insulating component.

[0175] Further, the housing 111 can be an integral structure.

[0176] Further, the housing 111 may further include a housing body 1113 and a plugging member 1114. A plurality of channels 1115 are formed in the housing body 1113. The plurality of channels 1115 are arranged along the second direction Y. One port of the channel 1115 constitutes a first opening 1112, and the other port of the channel 1115 constitutes a second opening. The plugging member 1114 is connected to the housing body 1113. The plugging member 1114 closes the second opening and encloses a receiving groove 1111 with the housing body 1113.

[0177] Further, the battery device 100 further includes a connection structure. Adjacent two battery modules 10 are connected through the connection structure. The connection structure includes at least one of a buffer pad and a structural adhesive.

[0178] In this application, a plurality of battery modules 10 are arranged along the first direction X inside the box body 20. Each battery module 10 forms a plurality of battery cells 14 along the second direction Y. The plurality of battery cells 14 share one housing 11, so that the overall rigidity of the battery device 100 can be improved in the second direction Y, and the situation of damage to the battery device 100 caused by external impact is reduced.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: a box body having an accommodation space; a plurality of battery modules arranged in the accommodation space and arranged in a first direction; wherein, each battery module includes a housing and a plurality of electrode assemblies, the housing includes a plurality of accommodation cavities arranged in a second direction and not communicating with each other, each accommodation cavity is respectively provided with an electrode assembly, and the plurality of accommodation cavities and the electrode assemblies therein respectively form a plurality of battery cells, one of the first direction and the second direction is the length direction of the battery device, and the other of the first direction and the second direction is the width direction of the battery device.

2. The battery device according to claim 1, characterized in that, The housing includes: a shell body provided with a plurality of accommodation grooves having a first opening, and the accommodation grooves are arranged in the second direction; a cover body connected to the shell body and closing the first openings of the respective accommodation grooves, and the cover body and the accommodation grooves enclose the accommodation cavities.

3. The battery device according to claim 2, characterized in that, The cover body includes a plurality of top covers corresponding to the plurality of accommodation grooves, the plurality of top covers are arranged in the second direction and are all connected to the shell body, and the top covers are used to close the first openings of the corresponding accommodation grooves.

4. The battery device according to claim 3, wherein, Both the shell body and the top covers are metal parts. Along the second direction, any two adjacent top covers are arranged at intervals, and the electrode assemblies are respectively insulated from the shell body and the top covers.

5. The battery device according to claim 4, characterized in that, The top cover and the shell body are fixedly connected by welding.

6. The battery device according to claim 5, characterized in that, The weld between the top cover and the shell body is arranged along the circumference of the first opening and surrounds the first opening for one week.

7. The battery device according to claim 4, characterized in that, Along the second direction, there is a first distance between two adjacent top covers, and the first distance is in the range of 2 mm to 15 mm.

8. The battery device according to claim 7, wherein, The first distance is in the range of 5 mm to 8 mm.

9. The battery device according to claim 5, characterized in that, The top cover is arranged outside the first opening of the accommodation groove and abuts against the shell body.

10. The battery device according to claim 5, characterized in that, The top cover is embedded in the first opening of the accommodation groove, and the circumferential edge of the top cover abuts against the inner wall of the accommodation groove.

11. The battery device according to claim 10, characterized in that, The side surface of the top cover facing away from the accommodation cavity is flush with the outer surface of the shell body having the first opening.

12. The battery device according to claim 5, wherein, The side surface of the top cover facing the shell body is provided with a matching structure arranged along the circumference of the first opening of the accommodation groove, and one end of the shell body having the first opening is in concave-convex fit with the matching structure.

13. The battery device according to claim 12, wherein, An embedding groove is formed on the side surface of the top cover facing the shell body, and the embedding groove constitutes the matching structure. One side wall of the embedding groove is communicated with the edge of the top cover. One end of the shell body having the first opening is embedded in the embedding groove. Wherein, a part of the body of the top cover is embedded in the first opening of the accommodation groove, and the other part of the body of the top cover is located outside the first opening of the accommodation groove.

14. The battery device according to claim 13, characterized in that, Along the direction parallel to the top surface of the top cover, the width of the embedding groove is in the range of 0.2 mm to 3 mm.

15. The battery device according to claim 14, characterized in that, The width is in the range of 0.4 mm to 1.5 mm.

16. The battery device according to claim 13, characterized in that, In a direction perpendicular to the top surface of the top cover, the depth of the embedding groove ranges from 0.1 mm to 2 mm.

17. The battery device according to claim 16, wherein The depth ranges from 0.3 mm to 1 mm.

18. The battery device according to claim 4, characterized in that, An insulating structure is provided between the inner wall of the accommodating groove and the electrode assembly, and the insulating structure includes at least one of an insulating coating, an insulating electrophoresis layer, and an insulating component.

19. The battery device according to claim 2, wherein, The housing is of an integral structure; and / or, the housing includes a housing body and a plugging member. A plurality of channels are formed in the housing body, and the plurality of channels are arranged along the second direction. One port of the channel forms the first opening, and the other port of the channel forms the second opening. The plugging member is connected to the housing body, and the plugging member closes the second opening and encloses the accommodating groove with the housing body.

20. The battery device according to any one of claims 1 to 19, characterized in that, Adjacent two of the battery modules are connected by a buffer pad and / or structural adhesive.

21. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1 to 20.

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