Battery device, power utilization device and energy storage device

Abstract

The invention provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a plurality of battery monomers, a box body, a junction box, an electric connection terminal, an electric connection piece and an upper cover, the battery monomers are located in a first containing cavity defined by the frame of the box body and the first beam, the junction box electrically connected with the battery monomers is located on the side, away from the battery monomers, of the first beam, and the electric connection terminal is arranged on the frame and located on the side, away from the junction box, of the first containing cavity. The junction box and the electric connection terminal are electrically connected through an electric connection piece, the upper cover covers the box body, the upper cover comprises a protruding part protruding towards the inner side of the first containing cavity, and the electric connection piece is constructed to be bent in the height direction of the box body so as to cross the first beam; and the two opposite surfaces of the electric connecting piece along the height direction of the box body are respectively propped against at least one part of the plurality of battery monomers and the lug boss. The overall anti-expansion performance and the dominant frequency stability of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Due to the characteristics of storing energy or releasing energy as needed, batteries are widely used in various electrical devices or energy storage systems and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor related to its development.

[0003] In a battery device, an electrical connection between a junction box and electrical connection terminals disposed on different sides needs to be achieved through an electrical connector. However, some limiting structures are usually provided inside the battery box to limit battery cells, such as an expansion beam. To avoid interference between the electrical connector and components such as the expansion beam, a groove can be formed on the expansion beam to allow the electrical connector to pass through, but this will reduce the structural strength of the battery box and thus affect the reliability of the battery device. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. To this end, an object of the present application is to provide a battery device, an electrical device, and an energy storage device, which can improve the structural reliability of the battery device.

[0005] An embodiment of the first aspect of the present application provides a battery device, which includes a plurality of battery cells, a box body, a junction box, electrical connection terminals, an electrical connector, and an upper cover. The box body includes a frame and a first beam connected to the frame, and the frame and the first beam are used to define a first accommodation cavity for accommodating a plurality of battery cells. The junction box is electrically connected to the plurality of battery cells, and the junction box is located on a side of the first beam away from the battery cells. The electrical connection terminals are disposed on the frame, and the electrical connection terminals are located on a side of the first accommodation cavity away from the junction box. Two ends of the electrical connector are respectively electrically connected to the junction box and the electrical connection terminals, and the upper cover covers the box body. The upper cover includes a convex portion protruding toward the inside of the first accommodation cavity. Among them, the electrical connector is configured to be bent in the height direction of the box body to cross the first beam, and two opposite surfaces of the electrical connector in the height direction of the box body are respectively in contact with at least a part of the plurality of battery cells and the convex portion.

[0006] In the technical solution of the embodiment of the present application, the electrical connector with both ends respectively connected to the junction box and the electrical connection terminal is configured to be bent in the height direction of the box body, so that it can cross the first beam in the height direction without opening a slot for the electrical connector to pass through at the end of the first beam, without damaging or reducing the connection strength between the first beam and the frame, which is beneficial to improving the structural strength of the battery box body and further improving the structural reliability of the battery device. The upper cover is provided with a convex portion that abuts against the electrical connector, which can abut the electrical connector more closely against the battery cell, thus enhancing the overall anti-expansion performance of the battery device and improving the main frequency stability of the battery device, and reducing the risk of component failure caused by resonance.

[0007] In some embodiments, the box body further includes a bottom plate connected to the frame, and the bottom plate is used to carry a plurality of battery cells. The electrical connector includes a first section electrically connected to the junction box, a second section electrically connected to the electrical connection terminal, and a third section located between the first section and the second section. Among them, the third section is located on the side of the first beam away from the bottom plate, and the third section contacts the surfaces of at least some of the plurality of battery cells away from the bottom plate. In this way, the electrical connector and the bottom plate can be correspondingly located on opposite sides of the plurality of battery cells, so as to reduce the influence of the electrical connector on the connection length between the frame and the first beam while reasonably utilizing the layout space of the battery device and reducing the mutual interference between the electrical connector and the bottom plate. And it can limit the relative displacement of at least some of the battery cells, which is beneficial to improving the overall stiffness of the battery device to increase the main frequency of the battery device.

[0008] In some embodiments, the third section of the electrical connector includes a conductive portion and an insulating portion along the height direction of the box body, and the conductive portion is used to realize the electrical connection between the first section and the second section. Among them, the insulating portion is located on the surface of the conductive portion facing the bottom plate and abuts against the surfaces of at least some of the plurality of battery cells away from the bottom plate. In this way, the main frequency of the battery device can be improved by using the conductive portion and the insulating portion, and the insulation between the battery cell and the conductive portion can be realized through the insulating portion.

[0009] In some embodiments, the insulating portion is made of an elastic material. In this way, the vibration impact of the battery cell can be absorbed to a certain extent, the vibration generated when the battery device is subjected to vibrations and other excitations can be alleviated, the main frequency of the battery device can be increased, and moreover, the service life of the electrical connector can be extended.

[0010] In some embodiments, the insulating portion is a molded plate. In this way, while increasing the main frequency of the battery device, the manufacturing efficiency of the battery device can be improved, and the space occupied by the insulating portion in the height direction of the box body can be reduced.

[0011] In some embodiments, the third section of the electrical connector further includes a first adhesive layer, and the insulating portion is bonded to the conductive portion through the first adhesive layer. In this way, it is convenient to realize the production line installation of the insulating portion and the conductive portion, simplify the manufacturing process, and realize the integrated incoming material design of the insulating portion and the conductive portion.

[0012] In some embodiments, the battery device further includes a second adhesive layer. Wherein, the insulating portion is bonded to the surfaces of at least some of the plurality of battery cells away from the bottom plate through the second adhesive layer. In this way, close contact between the insulating portion and the battery cells can be achieved, and the main frequency stability of the battery device can be improved.

[0013] In some embodiments, the thickness dimension of the conductive portion is smaller than the width dimension of the conductive portion. In this way, the contact area between the electrical connector and the battery cell can be increased, and the space occupied by the conductive portion in the height direction of the box body can be reduced, which is beneficial to improving the energy density of the battery device.

[0014] In some embodiments, the thickness dimension T and the width dimension W of the conductive portion satisfy: 5 ≤ W / T ≤ 50. In this way, the conductive portion can reduce its space occupation in the height direction while providing a sufficient overcurrent area, making the structural arrangement of the battery device more compact and improving the energy density of the battery.

[0015] In some embodiments, the thickness dimension T of the conductive portion satisfies: 0 < T ≤ 2 mm. In this way, the space occupied by the conductive portion in the height direction of the box body can be reduced, and the energy density of the battery device can be improved.

[0016] In some embodiments, the width dimension W of the conductive portion satisfies: 30 mm ≤ W ≤ 100 mm. In this way, the conductive portion can have better heat dissipation capacity and increase the contact area with the battery cell.

[0017] In some embodiments, the plurality of battery cells include multiple groups of battery cell groups arranged side by side in a first direction, and each group of battery cell groups includes at least one battery cell stacked in a second direction. In the projection plane perpendicular to the height direction of the box body, the orthographic projection of the electrical connector partially overlaps the orthographic projections of two adjacent groups of battery cell groups at the same time. In this way, it is beneficial to improve the main frequency of the battery device.

[0018] In some embodiments, the electrical connector further includes a buffer portion on the side of the conductive portion in the third section away from the bottom plate, and the conductive portion abuts against the convex portion through the buffer portion. In this way, buffering and fixing between the conductive portion and the convex portion can be realized, external shocks can be absorbed, the pressing reliability between the conductive portion and the convex portion can be improved, and the risk of component failure caused by resonance can be reduced.

[0019] In some embodiments, the frame and the first beam are also used to define a second receiving cavity for receiving a junction box. In this way, the integration degree of the battery device can be improved.

[0020] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0021] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery device in the above embodiment, and the battery device is used to store electrical energy.

[0022] The above description is only an overview of the technical solutions of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below. Description of the Drawings

[0023] In the drawings, unless otherwise specified, the same reference numerals throughout the drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as a limitation on the scope of the present application.

[0024] Figure 1 Structural schematic diagram of a vehicle according to some embodiments of the present application; Figure 2 Structural schematic diagram of a battery device according to some embodiments of the present application; Figure 3 Exploded structural schematic diagram of a battery cell according to some embodiments of the present application; Figure 4 Structural schematic diagram of an electrical connector according to some embodiments of the present application; Figure 5 Exploded structural schematic diagram of an electrical connector according to some embodiments of the present application; Figure 6 Structural schematic diagram of a battery device according to some other embodiments of the present application; Figure 7 For Figure 6 Cross-sectional view taken along the A-A direction in; Figure 8 For Figure 7 Local enlarged view at B in; Figure 9 Schematic diagram of the connection between a battery cell and a connecting piece according to some embodiments of the present application; Figure 10 For Figure 9 Local enlarged view at C in; Figure 11A partial enlarged view of the electrical connection terminals and the electrical connection members in some embodiments of the present application being electrically connected via the adapter; Figure 12 This is a schematic diagram of the structure of the first adapter and the second adapter in some embodiments of the present application.

[0025] Description of reference numerals: Vehicles 1000; Battery device 100, controller 200, motor 300; Battery cell 10, shell assembly 101, shell 1011, end cover 1012, electrode assembly 102, pole ear 1021, electrode terminal 103, box body 20, first accommodating cavity 20A, second accommodating cavity 20B, frame 201, first beam 202, bottom plate 203, electrical connection terminal 30, electrical connector 40, first section 401, second section 402, third section 403, conductive portion 4031, insulating portion 4032, first adhesive layer 4033, buffer portion 4034, second adhesive layer 50, connecting sheet 60, upper cover 70, protrusion 701, adapter 80, first adapter 801, second adapter 802, first connection end 8021, second connection end 8022. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0028] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0029] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] 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 document generally represents an "or" relationship between the associated objects before and after.

[0031] 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).

[0032] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is 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 should not be construed as a limitation on the embodiments of the present application.

[0033] 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 may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside 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 circumstances.

[0034] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. 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 various electronic devices, such as electric vehicles, electric motorcycles, electric bicycles and other electric transportation vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of batteries, the market demand is also increasing continuously. It should be noted that the battery in this application may refer to a battery cell or a battery device, and the battery may be a rechargeable battery.

[0035] In a battery device, in addition to carrying battery cells and a junction box, the battery box body is also used to carry electrical connection terminals for connecting the battery to an external electrical device or a charging device. In some embodiments, some of the electrical connection terminals and the junction box are respectively located on both sides of the accommodation cavity for accommodating a plurality of battery cells, and the electrical connection member connecting the electrical connection terminals and the junction box needs to extend from one end of the battery box body to the other end, which will interfere with the first beam (for example, the first beam is an expansion beam) used to limit the battery cells in the battery box body. To avoid interference, the electrical connection member can be arranged along the frame of the battery box body facing the side surface of the battery cell, and a through groove is provided at the connection between the first beam and the frame of the battery box body for the electrical connection member to pass through. However, grooving the first beam will reduce the connection length between the frame and the first beam, weaken the connection strength between the two, and thus affect the reliability of the battery device.

[0036] Based on the above considerations, in order to reduce the influence of the electrical connection member on the connection length between the frame and the first beam and improve the reliability of the battery device, an embodiment of the present application provides a battery device, which includes a plurality of battery cells, a box body, a junction box, electrical connection terminals, an electrical connection member, and an upper cover. The box body includes a frame and a first beam connected to the frame, and the frame and the first beam are used to define a first accommodation cavity for accommodating a plurality of battery cells. The junction box is electrically connected to the plurality of battery cells, and the junction box is located on the side of the first beam away from the battery cells. The electrical connection terminals are arranged on the frame, and the electrical connection terminals are located on the side of the first accommodation cavity away from the junction box. Both ends of the electrical connection member are electrically connected to the junction box and the electrical connection terminals respectively, and the upper cover covers the box body. The upper cover includes a convex portion protruding toward the inside of the first accommodation cavity. Among them, the electrical connection member is configured to bend in the height direction of the box body to cross the first beam, and two opposite surfaces of the electrical connection member in the height direction of the box body are respectively in contact with at least a part of the plurality of battery cells and the convex portion.

[0037] In the technical solution of the embodiment of the present application, the electrical connection member is configured to bend in the height direction of the box body to cross the first beam, which can avoid interference between the electrical connection member and the first beam, without grooving at the connection between the first beam and the frame, and will not reduce the connection length and connection strength between the frame and the first beam, improving the structural strength and reliability of the battery device.

[0038] The battery cells and battery devices disclosed in the embodiments of the present application can be used, but are not limited to, power-consuming devices or energy storage devices such as vehicles, ships, or aircraft. The power supply system of the power-consuming device or energy storage device can be composed of the battery cells, battery devices, etc. disclosed in the present application. In this way, it is beneficial to reduce the influence of the electrical connection member on the connection length between the frame and the first beam, and improve the reliability of the battery device.

[0039] The embodiments of the present application provide a power-consuming device using a battery device as a power source. The power-consuming device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0040] The embodiments of the present application also provide an energy storage device using a battery device as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system, etc.

[0041] For the convenience of description in the following embodiments, a power-consuming device of a vehicle in an embodiment of the present application is taken as an example for description.

[0042] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle 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, or an extended-range vehicle, etc. A battery device 100 is provided 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 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 requirements during the start, navigation, and driving of the vehicle 1000.

[0043] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0044] Please refer to Figures 2 - 8 , the embodiments of the present application provide a battery device 100. The battery device 100 includes a plurality of battery cells 10, a box body 20, a junction box (not shown in the figure), electrical connection terminals 30, electrical connection members 40, and an upper cover 70.

[0045] The box body 20 includes a frame 201 and a first beam 202 connected to the frame 201. The frame 201 and the first beam 202 are used to define a first accommodation cavity 20A for accommodating a plurality of battery cells 10.

[0046] The junction box is electrically connected to the plurality of battery cells 10, and the junction box is located on a side of the first beam 202 away from the battery cells 10.

[0047] The electrical connection terminal 30 is disposed on the frame 201, and the electrical connection terminal 30 is located on a side of the first accommodation cavity 20A away from the junction box.

[0048] Both ends of the electrical connector 40 are electrically connected to the junction box and the electrical connection terminal 30 respectively.

[0049] The upper cover 70 is covered on the box body 20, and the upper cover 70 includes a convex portion 701 protruding toward the inside of the first accommodation cavity 20A. Wherein, the electrical connector 40 is configured to bend in the height direction X of the box body 20 to cross over the first beam 202, and two opposite surfaces of the electrical connector 40 in the height direction of the box body 20 are respectively in contact with at least a part of the plurality of battery cells 10 and the convex portion 701.

[0050] It should be noted that Figure 2 In order not to show the spatial range of the first accommodation cavity 20A, only some of the battery cells 10 are shown as being accommodated in the first accommodation cavity 20A, Figure 2 The number of the shown battery cells 10 is not used to limit this application.

[0051] The battery device 100 is a device for storing and providing electric energy. The battery device 100 may include at least one battery cell 10.

[0052] The battery cell 10 refers to the smallest unit that makes up the battery device 100. The battery cell 10 may include a housing assembly 101, an electrode assembly 102, and an electrolyte. The housing assembly 101 is used to accommodate the electrode assembly 102 and the electrolyte. The housing assembly 101 may include a housing body 1011 and an end cap 1012. The housing body 1011 has an opening, and the end cap 1012 covers the opening of the housing body 1011 to form a receiving space for accommodating the electrode assembly 102 and the electrolyte. The housing assembly 101 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc.; the material of the housing assembly 101 can be various, such as but not limited to metals such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. The electrode assembly 102 is a component in the battery cell 10 where an electrochemical reaction occurs. One or more electrode assemblies 102 may be included in the housing assembly 101. The electrode assembly 102 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 102, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 1021. The positive electrode tab and the negative electrode tab may be located at one end of the main body together or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs 1021 are connected to the electrode terminals 103 to form an electric current loop.

[0053] Functional components such as the electrode terminals 103 may be provided on the end cap 1012. The electrode terminals 103 can be used to electrically connect to the electrode assembly 102 for outputting or inputting the electrical energy of the battery cell 10. The electrode terminals 103 include a positive electrode and a negative electrode.

[0054] When the battery device 100 includes multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a combined series-parallel connection. Among them, the combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 10 is accommodated in the box body 20; of course, the battery device 100 can also be in the form that multiple battery cells 10 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body 20.

[0055] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0056] The box body 20 is used to provide an accommodation space for the battery cell 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 can be a hollow structure with one end open. In other embodiments, the box body 20 can also be a hollow structure with both opposite ends open. The material of the box body 20 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin.

[0057] The frame 201 in the box body 20 refers to the side wall that forms the accommodation space of the box body 20. In the projection plane perpendicular to the height direction X of the box body 20, the frame 201 of the box body 20 can be in the shape of a polygon or the like. The frame 201 can be a plate-like structural member or an extruded profile member.

[0058] The first beam 202 is a component for providing restraint and limitation to the battery cell 10. In some embodiments, the first beam 202 can be an expansion beam, and the expansion beam is a structural member that can withstand and limit the expansion force of the battery cell, and can enhance the overall structural strength of the battery box. The expansion beam can be an extruded profile. During installation, both ends of the expansion beam can be fixedly connected to the frame by welding, so as to be used to restrain the expansion of the battery cell 10.

[0059] In some embodiments, the first beam 202 and the frame 201 are fixedly connected. In some embodiments, the first beam 202 and the frame 201 can be integrally formed. In other embodiments, the first beam 202 and the frame 201 can also be independently formed and fixedly connected by means such as welding and snap connection.

[0060] In some embodiments, the first beam 202 is located within the accommodation space surrounded by the frame 201, and the opposite ends of the first beam 202 along its length direction are fixedly connected to the frame 201. Since the battery cell 10 is usually designed with electrode materials stacked together and the space between layers is limited, when gas is generated inside the battery cell 10, the battery cell 10 is prone to expand along its thickness direction. Therefore, in order for the first beam 202 to restrain the expansion of the battery cell 10, the length direction of the first beam 202 can be set perpendicular to the thickness direction of the battery cell 10.

[0061] In some embodiments, the box body 20 includes at least one first beam 202. In some embodiments, a plurality of first beams 202 are provided inside the box body 20, and the plurality of first beams 202 are arranged parallel and spaced apart in the horizontal direction, and a plurality of battery cells 10 are provided between adjacent two first beams 202.

[0062] In some embodiments, the battery cell 10 is a square shell battery cell. The junction box, the first accommodation cavity 20A for accommodating a plurality of battery cells 10, and the electrical connector 40 are along the thickness direction of the battery cell 10 (such asFigure 2 arranged in the Y direction), the first beam 202 extends along the length direction of the battery cell 10 (such as Figure 2 the Z direction in), and the opposite ends of the first beam 202 along the length direction of the battery cell 10 are fixedly connected to the frame 201.

[0063] The first accommodation cavity 20A is a space jointly defined by the frame 201 and the first beam 202, and the first accommodation cavity 20A is used to accommodate the battery cell 10. It should be noted that the frame 201 and the first beam 202 can jointly define at least one first accommodation cavity 20A, and any first accommodation cavity 20A can accommodate at least one battery cell 10.

[0064] The junction box is an electrical device used to connect multiple battery cells 10 to other devices and distribute power. In some embodiments, the junction box includes a high-voltage box. The high-voltage box can be used for the key parts connecting multiple battery cells 10 and other high-voltage electrical components (such as motors, inverters, chargers, etc.). In some embodiments, the junction box includes safety devices such as fuses and circuit breakers to prevent damage caused by overcurrent or short circuit. In some embodiments, the junction box can have the function of monitoring voltage and current to report status information to the vehicle control system.

[0065] The electrical connection terminal 30 is an electrical connection device used to transfer electrical energy or signals. The electrical connection terminal 30 is arranged on the frame 201 may mean that there are openings on the frame 201 for installing the electrical connection terminal 30. The electrical connection terminal 30 and the junction box can be arranged on opposite sides of the first accommodation cavity 20A. In some embodiments, the electrical connection terminal 30 includes a high-voltage connector.

[0066] The electrical connector 40 is a connecting component that realizes electrical connection between electrical devices. Since the electrical connection terminal 30 and the junction box are arranged on both sides of the first accommodation cavity 20A, and the junction box needs to be electrically connected to the electrical connection terminal 30 to realize the transfer of electrical energy. Therefore, the electrical connector 40 is provided to realize the electrical connection between the junction box and the electrical connection terminal 30 through the electrical connector 40.

[0067] In some embodiments, the electrical connector 40 includes a connecting tab. In some embodiments, the material of the connecting tab is a metal such as copper or aluminum.

[0068] The height direction X of the box body 20 refers to the direction pointing from the bottom to the top of the box body 20. In some embodiments, the height direction X of the box body 20 may be the same as the height direction of the battery cell 10, and the height direction of the battery cell 10 is perpendicular to the thickness direction of the battery cell 10. In some embodiments, the box body 20 includes a bottom plate 203 for carrying a plurality of battery cells 10, and the height direction X of the box body 20 may refer to the direction pointing from the side of the bottom plate 203 away from the plurality of battery cells 10 to the side of the bottom plate 203 facing the plurality of battery cells 10.

[0069] The upper cover 70 refers to the component covering the opening of the box body 20. In some embodiments, the upper cover 70 and the bottom plate 203 are oppositely arranged, and the upper cover 70, the bottom plate 203 and the frame 201 form an accommodation space of the box body 20 including the first accommodation cavity 20A. The material of the upper cover 70 may include, but is not limited to, metals such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., or may also be made of non-metallic materials.

[0070] The convex part 701 is the part of the upper cover 70 protruding inwardly into the first accommodation cavity 20A, and the convex part 701 may be formed by stamping the upper cover 70.

[0071] In some embodiments, the shape and size of the convex part 701 may be adapted to the shape and size of the electrical connector. For example, it may be a long strip with an extension direction the same as that of the part of the electrical connector 40 located at the top of the battery cell 10. Another example is that the length and width of the bottom surface of the convex part 701 in contact with the electrical connector 40 are the same as those of the part of the electrical connector 40 located at the top of the battery cell 1-.

[0072] It can be understood that the contact between the upper cover 70 and the electrical connector 40 is an insulated contact. Specifically, the upper cover 70 can be made of an insulating material, or an insulating layer can be provided at the part where the upper cover 70 is in contact with the electrical connector 40 to prevent unnecessary electric leakage due to the formation of an electrical connection between the two.

[0073] The electrical connector 40 is configured to bend in the height direction X of the box body 20 to cross the first beam 202 means that at least a part of the electrical connector 40 bends in the height direction X of the box body 20 relative to the two connection ends of the electrical connector, so that the electrical connector 40 avoids the position where the first beam 202 is located. In some examples, as Figure 2 shown, the electrical connector 40 is configured to be bent in a "Z" shape along the height direction X. The two opposite sides of the electrical connector 40 along the height direction of the box body are respectively in contact with the top surface of the battery cell 10 and the convex part 701. That is to say, along the height direction of the box body, the battery cell 10, the electrical connector 40 and the convex part 701 are arranged in sequence.

[0074] It should be noted that the abutment between the battery cell 10, the electrical connection member 40 and the protrusion 701 can be a direct abutment or an indirect abutment through some other functional layers or components.

[0075] During the repeated alternation of energy storage and output of the battery device 100, multiple rounds of repeated expansion forces will be generated. Therefore, it is necessary to place the electrical device using the battery device 100 in different working conditions. Taking the battery device 100 being used in a vehicle as an example, during the use of the vehicle, it is necessary to place the vehicle in various working conditions such as climbing at a fixed frequency, rapid acceleration, rapid deceleration, shifting, and idling. The expansion force of the battery device 100 is still relatively stable and maintains a relatively high main frequency.

[0076] However, in actual applications, the battery device 100 is affected by incentives such as impacts and vibrations, which may cause the battery cells to break free from the constraints, resulting in a decrease in the main frequency of the battery device, making it easy to resonate with the entire vehicle, leading to a sharp increase in the amplitude of the battery device 100. As a result, it is easy to cause structural fatigue failure or functional failure of the battery device 100. Therefore, to improve the problem that the battery device 100 is affected by incentives such as impacts and vibrations and the main frequency decreases, resulting in resonance, the electrical connection member 40 is abutted against the top of the battery cell 10 through the protrusion 701, which can correspondingly limit the relative displacement of at least a part of the battery cells 10 in contact with the electrical connection member 40, and is beneficial to improving the main frequency stability of the battery device 100 and reducing the risk of component failure caused by resonance.

[0077] By configuring the electrical connection member 40 connecting the junction box and the electrical connection terminal 30 to be bent in the height direction X of the box body 20 to cross over the first beam 202, so that the electrical connection member 40 no longer passes through the connection between the first beam 202 and the frame 201, and then the first beam 202 does not need to be provided with a groove for avoiding the first beam 202, and further the connection between the first beam 202 and the frame 201 is not affected by the electrical connection member 40, which is beneficial to improving the structural strength of the box body 20, improving the overall anti-expansion performance of the battery device 100, and improving the reliability of the battery device 100.

[0078] Please continue to refer to Figure 2 and Figures 4 - 5 According to some embodiments of the present application, the box body 20 further includes a bottom plate 203 connected to the frame 201, and the bottom plate 203 is used to carry a plurality of battery cells 10. The electrical connection member 40 includes a first section 401 electrically connected to the junction box, a second section 402 electrically connected to the electrical connection terminal 30, and a third section 403 located between the first section 401 and the second section 402. Among them, the third section 403 is located on the side of the first beam 202 away from the bottom plate 203, and the third section 403 contacts the surface of at least a part of the plurality of battery cells 10 away from the bottom plate 203.

[0079] The bottom plate 203 is a component that bears multiple battery cells 10. In some embodiments, the bottom plate 203 can be integrally formed with the frame 201 or can be independently formed from the frame 201. In other embodiments, a reusable water-cooled plate can be used as the bottom plate 203.

[0080] The electrical connector 40 includes a first section 401, a second section 402, and a third section 403 that are connected to each other. The third section 403 is connected between the first section 401 and the second section 402. The first section 401 is used for electrical connection with a junction box, the second section 402 is used for electrical connection with the electrical connection terminal 30, and the third section 403 is located on the side of the first beam 202 away from the bottom plate 203. That is to say, the third section 403 is arranged across the first beam 202.

[0081] The contact between the third section 403 and the surfaces of at least some of the multiple battery cells 10 away from the bottom plate 203 can mean that the surfaces of some of the battery cells 10 among the multiple battery cells 10 away from the bottom plate 203 are in contact with the third section 403, or it can mean that the surfaces of all the battery cells 10 away from the bottom plate 203 are in contact with the third section 403.

[0082] In some embodiments, the third section 403 can be located on top of the battery cell 10 and in contact with the upper surface of the battery cell 10, so as to provide a vertical constraint on the battery cell 10.

[0083] In some embodiments, among the battery cells 10 on the arrangement path of the third section 403, the battery cells 10 that overlap with the arrangement position of the third section 403 are in contact with the third section 403. That is, in the projection plane perpendicular to the height of the box body 20, the battery cells 10 that overlap with the orthographic projection part of the third section 403 are in contact with the third section 403.

[0084] In some embodiments, the third section 403 can extend in a straight line to reduce the connection distance between the junction box and the electrical connection terminal 30 and shorten the electrical energy transmission path. It can be understood that the third section 403 can also extend in the form of a curve, a broken line, etc., and the present application does not limit this.

[0085] The free end of the first section 401 can be directly or indirectly electrically connected to the junction box, and the free end of the second section 402 can be directly or indirectly connected to the electrical connection terminal 30. In some examples, at least one of the two connection ends of the electrical connector 40 can be electrically connected to the connection object through an adapter, and the adapter can be an adapter that simultaneously matches the connection end of the electrical connector 40 and the connection end of the connection object.

[0086] By positioning the third section 403 of the electrical connector 40 on the side of the first beam 202 away from the bottom plate 203 of the box body 20, the electrical connector 40 and the bottom plate 203 are correspondingly located on opposite sides of the plurality of battery cells 10. This reduces the impact of the electrical connector 40 on the connection length between the frame 201 and the first beam 202 while rationally utilizing the layout space of the battery device 100 and reducing the mutual interference between the electrical connector 40 and the bottom plate 203.

[0087] By bringing the third section 403 into contact with the surfaces of at least some of the plurality of battery cells 10 that are away from the bottom plate 203, the relative displacement of at least some of the battery cells 10 can be restricted, which is beneficial to improving the overall stiffness of the battery device 100 and increasing the main frequency of the battery device 100.

[0088] Please continue to refer to Figure 2 and Figures 4 - 5 , according to some embodiments of the present application, the third section 403 of the electrical connector 40 includes a conductive portion 4031 and an insulating portion 4032 along the height direction X of the box body 20. The conductive portion 4031 is used to achieve electrical connection between the first section 401 and the second section 402. Among them, the insulating portion 4032 is located on the surface of the conductive portion 4031 facing the bottom plate 203 and abuts against the surfaces of at least some of the plurality of battery cells 10 that are away from the bottom plate 203.

[0089] The fact that the third section 403 of the electrical connector 40 includes a conductive portion 4031 and an insulating portion 4032 along the height direction X of the box body 20 means that along the height direction X of the box body 20, the electrical connector 40 includes a conductive portion 4031 and an insulating portion 4032 arranged in a stacked manner.

[0090] The electrical connection between the first section 401 and the second section 402 is achieved through the conductive portion 4031, and the first section 401, the second section 402, and the conductive portion 4031 can be integrally formed. In some embodiments, the material of the conductive portion 4031 includes conductive metals such as copper and aluminum.

[0091] The insulating portion 4032 is disposed on the surface of the conductive portion 4031 facing the battery cell and is made of an insulating material. The insulating portion 4032 can be connected to the conductive portion 4031 in any feasible manner, such as snap connection, bonding, etc.; or it can simply be clamped between the conductive portion 4031 and the battery cell 10 in a contact manner.

[0092] In some embodiments, the insulating portion 4032 can be a part of an insulating bushing sleeved on the outer periphery of the conductive portion 4031.

[0093] In some embodiments, the electrical connector 40 can be used to realize the function of the composite bead. By integrating the insulating part 4032 and the conductive part 4031 together before the materials are received, on the one hand, the assembly time can be reduced, and on the other hand, the electrical connector 40 is used to replace the composite bead to limit the battery cell 10, which can reduce the number of composite bead. Among them, the composite bead is used to compress the battery cell 10 to improve the main frequency reduction of the battery device 100 caused by vibration and other excitations and the failure of the components in the battery device 100.

[0094] By making the third section 403 of the electrical connector 40 include a conductive part 4031 and an insulating part 4032 along the height direction X of the box body 20, the conductive part 4031 is used to realize the electrical connection between the first section 401 and the second section 402, and the insulating part 4032 and the conductive part 4031 abutting against the surface of at least a part of the battery cells 10 away from the bottom plate 203 are used to increase the main frequency of the battery device 100, and the insulating part 4032 is used to realize the insulation setting between the battery cells 10 and the conductive part 4031.

[0095] According to some embodiments of the present application, the insulating part 4032 is made of elastic material.

[0096] Elastic materials refer to materials that undergo elastic deformation when subjected to force and can recover or partially recover their original shape after the applied force is removed. Elastic materials may include one or more of rubber, polyurethane, etc.

[0097] By making the insulating part 4032 of elastic material, the vibration impact of the battery cell 10 can be absorbed to a certain extent, which can not only alleviate the vibration generated by the battery device 100 when it is stimulated by vibration, improve the main frequency of the battery device 100, but also increase the service life of the electrical connector 40.

[0098] According to some embodiments of the present application, the insulating portion 4032 is a molded plate.

[0099] A compression molded plate is a plate material manufactured by a high temperature and high pressure mold forming process. In some embodiments, the compression molded plate is manufactured by a compression molding process.

[0100] In some embodiments, a U-shaped composite bead is used to compress the battery cell 10 to increase the main frequency of the battery. However, when the U-shaped composite bead is formed by extrusion, the width of the composite bead cannot be too wide and the thickness cannot be too thin, resulting in low yield and material utilization. In addition, in the height direction X of the box body 20, the composite bead occupies a large space.

[0101] In comparison, using a molded plate as the insulating part 4032 can reduce the requirements for the formed shape of the insulating part 4032, which is beneficial to improving the process efficiency and material utilization rate. Moreover, the thickness of the insulating part 4032 can be made thinner and match the shape of the conductive part 4031, which is beneficial to reducing the space occupied by the insulating part 4032 in the height direction X of the box body 20.

[0102] By setting the insulating part 4032 as a molded plate, while increasing the main frequency of the battery device 100, the manufacturing efficiency of the battery device 100 can be improved, and the space occupied by the insulating part 4032 in the height direction X of the box body 20 can be reduced.

[0103] Please continue to refer to Figure 5 , according to some embodiments of the present application, the third section 403 of the electrical connector 40 further includes a first adhesive layer 4033, and the insulating part 4032 is bonded to the conductive part 4031 through the first adhesive layer 4033.

[0104] The first adhesive layer 4033 is an adhesive layer for bonding the insulating part 4032 and the conductive part 4031. In some embodiments, the first adhesive layer 4033 includes double-sided tape.

[0105] In some embodiments, the surface of the insulating part 4032 can have the same roughness and surface energy as the surface of the composite strip, so as to have stable bonding performance between the conductive part 4031 and the insulating part 4032, and reduce the probability of debonding between the conductive part 4031 and the insulating part 4032.

[0106] By bonding the insulating part 4032 and the conductive part 4031 through the first adhesive layer 4033, it is convenient to realize the production line installation of the insulating part 4032 and the conductive part 4031, simplify the manufacturing process, and realize the integrated incoming material design of the insulating part 4032 and the conductive part 4031.

[0107] Please continue to refer to Figures 4 - 8 , according to some embodiments of the present application, the battery device 100 further includes a second adhesive layer 50. Among them, the insulating part 4032 is bonded to the surface of at least a part of the plurality of battery cells 10 away from the bottom plate 203 through the second adhesive layer 50.

[0108] The second adhesive layer 50 is an adhesive layer for bonding the insulating part 4032 and at least a part of the plurality of battery cells 10. In some embodiments, the second adhesive layer 50 includes structural adhesive.

[0109] The insulation part 4032 is bonded to the surface of at least a part of the plurality of battery cells 10 away from the bottom plate 203 through the second adhesive layer 50, which may mean that on the arrangement path of the third section 403, the battery cells 10 overlapping the arrangement position of the third section 403 are bonded to the insulation part 4032 through the second adhesive layer 50.

[0110] In some embodiments, the surface of the insulation part 4032 may have the same roughness and surface energy as the surface of the composite strip, so as to have stable bonding performance between the battery cell 10 and the insulation part 4032, and reduce the probability of debonding between the battery cell 10 and the insulation part 4032.

[0111] By using the second adhesive layer 50 to bond the insulation part 4032 to the surface of at least a part of the plurality of battery cells 10 away from the bottom plate 203, close contact between the insulation part 4032 and the battery cell 10 can be achieved, and the main frequency stability of the battery device 100 can be improved.

[0112] Please continue to refer to Figure 2 and Figures 4 - 8 , according to some embodiments of the present application, the thickness dimension T of the conductive part 4031 is less than the width dimension W of the conductive part 4031.

[0113] The thickness dimension T of the conductive part 4031 refers to the dimension of the conductive part 4031 along the height direction X of the box body 20. The width dimension W of the conductive part 4031 refers to the dimension of the conductive part 4031 along the direction perpendicular to the thickness direction of the conductive part 4031 and perpendicular to the length direction of the third section 403. Among them, the length direction of the third section 403 refers to the extension direction of the straight line connecting the first section 401 and the second section 402.

[0114] The fact that the thickness dimension T of the conductive part 4031 is less than the width dimension W of the conductive part 4031 indicates that the conductive part 4031 can be formed into a wide and thin flat cross-sectional form.

[0115] In some embodiments, the cross-sectional shape of the conductive part 4031 may be rectangular or racetrack-shaped.

[0116] By making the thickness dimension T of the conductive part 4031 less than the width dimension W of the conductive part 4031, the contact area between the electrical connector 40 and the battery cell 10 can be increased, and the space occupied by the conductive part 4031 along the height direction X of the box body 20 can be reduced, which is beneficial to improving the energy density of the battery device 100.

[0117] Please continue to refer to Figure 2 and Figures 4 - 8 , according to some embodiments of the present application, the thickness dimension T of the conductive part 4031 and the width dimension W of the conductive part 4031 satisfy: 5 ≤ W / T ≤ 50.

[0118] In some embodiments, the ratio of the width dimension W to the thickness dimension T of the conductive portion 4031 is equal to 5, 8, 10, 12, 15, 18, 20, 25, 30, 35, 40, 45, 48, or 50.

[0119] On the basis of ensuring that the cross-section of the conductive portion 4031 meets the over-current requirement, the larger the ratio of the width dimension W to the thickness dimension T of the conductive portion 4031, the larger the surface area of the conductive portion 4031, which is more conducive to heat dissipation. When the over-current flows through the conductive portion 4031, the better the heat dissipation ability of the conductive portion 4031, the slower the temperature rise of the conductive portion 4031, and the slower the aging or fusing speed of the conductive portion 4031.

[0120] In some embodiments, to enable the conductive portion 4031 to have better over-current carrying capacity and heat dissipation ability, the ratio of the width dimension W to the thickness dimension T of the conductive portion 4031 is greater than or equal to 15.

[0121] By making the thickness dimension T and the width dimension W of the conductive portion 4031 satisfy 5 ≤ W / T ≤ 50, the conductive portion 4031 can reduce the space it occupies in the height direction X while providing sufficient over-current area, making the structural arrangement of the battery device 100 more compact and improving the energy density of the battery device 100.

[0122] According to some embodiments of the present application, the thickness dimension T of the conductive portion 4031 satisfies: 0 < T ≤ 2 mm.

[0123] Please continue to refer to Figure 2 and Figures 4 - 8 , in some embodiments, the thickness dimension T of the conductive portion 4031 satisfies T ≤ 10 mm. For example, the thickness dimension T of the conductive portion 4031 is equal to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or 9 mm.

[0124] It can be understood that the larger the thickness of the conductive portion 4031, the larger the space occupied by the conductive portion 4031 in the height direction X of the box body 20, and the greater the impact on the energy density of the battery device 100. Therefore, to improve the energy density of the battery device 100, the thickness dimension T of the conductive portion 4031 can be made to satisfy: 0 < T ≤ 2 mm.

[0125] In some embodiments, the thickness dimension T of the conductive portion 4031 is equal to 0.1 millimeter (mm), 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm, or 2 mm.

[0126] By making the thickness dimension T of the conductive portion 4031 satisfy 0 < T ≤ 2 mm, the space occupied by the conductive portion 4031 in the height direction X of the box body 20 is reduced, and the energy density of the battery device 100 is improved.

[0127] Please continue to refer to Figure 2 and Figures 4 - 8 , according to some embodiments of the present application, the width dimension W of the conductive portion 4031 satisfies 30 mm ≤ W ≤ 100 mm.

[0128] Since the larger the ratio of the width dimension W of the conductive portion 4031 to the thickness dimension T of the conductive portion 4031, the stronger the heat dissipation ability of the conductive portion 4031. Therefore, the width dimension W of the conductive portion 4031 is positively correlated with the heat dissipation ability. To make the conductive portion 4031 have better heat dissipation ability, the width dimension W of the conductive portion 4031 can be made to satisfy 30 mm ≤ T ≤ 100 mm.

[0129] In some embodiments, the width dimension W of the conductive portion 4031 is equal to 30 millimeters, 32 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 80 mm, 85 mm, 90 mm, 95 mm, 98 mm, or 100 mm.

[0130] By making the width dimension W of the conductive portion 4031 satisfy 30 mm ≤ T ≤ 100 mm, the conductive portion 4031 has better heat dissipation ability and the contact area with the battery cell 10 is increased.

[0131] Please continue to refer to Figure 2 and Figures 4 - 8 , according to some embodiments of the present application, the plurality of battery cells 10 include multiple groups of battery cell groups arranged side by side in the first direction Z, and each group of battery cell groups includes at least one battery cell 10 stacked in the second direction Y. In the projection plane perpendicular to the height direction X of the box body 20, the positive projection of the electrical connector 40 partially overlaps with the positive projections of two adjacent groups of battery cell groups at the same time.

[0132] The first direction Z can refer to the length direction of the first beam 202. The first direction Z can also refer to the length direction of the battery cell 10. The second direction Y can refer to the thickness direction of the battery cell 10. The second direction Y can also refer to the length direction of the electrical connection member 40.

[0133] The plurality of battery cells 10 includes multiple groups of battery cell groups arranged side by side along the first direction Z. A battery cell group means that there are multiple rows of battery cell groups arranged along the first direction Z. Each group of battery cell groups includes at least one battery cell 10 stacked along the second direction Y, which means that along the second direction Y, each group of battery cell groups has at least one battery cell group stacked.

[0134] The projection plane perpendicular to the height direction X of the box body 20 can be a plane parallel to the surface of the bottom plate 203 facing the plurality of battery cells 10. In the projection plane perpendicular to the height direction X of the box body 20, the orthographic projection of the electrical connection member 40 partially overlaps with the orthographic projections of two adjacent groups of battery cell groups at the same time, which means that the electrical connection member 40 can form contacts with the battery cells 10 of two adjacent groups of battery cell groups at the same time. The more battery cells 10 that the electrical connection member 40 contacts, the more battery cells 10 whose displacement can be restricted along the height direction X of the box body 20, which is beneficial to improving the main frequency of the battery device 100.

[0135] In some embodiments, the electrical connection member 40 can form contacts with the shoulders of the battery cells 10 of two adjacent groups of battery cell groups at the same time. For example, the battery cell 10 includes a first electrode terminal and a second electrode terminal provided on the end cap 1012. The part of the end cap 1012 corresponding to the first electrode terminal and the second electrode terminal forms a first part. The part of the end cap 1012 corresponding to the part of the first electrode terminal far from the second electrode terminal or the top cover corresponding to the part of the second electrode terminal far from the first electrode terminal forms a second part. The shoulder of the battery cell 10 corresponds to the second part. The second parts of the battery cells 10 of two adjacent groups of battery cell groups are adjacent along the first direction Z, and the electrical connection member 40 forms contacts with the second parts of the battery cells 10 of two adjacent groups of battery cell groups at the same time.

[0136] In some embodiments, the battery device 100 further includes a plurality of connecting pieces 60, and each connecting piece 60 is electrically connected to the electrode terminals 103 of two adjacent battery cells 10 respectively. Among them, in the projection plane perpendicular to the height direction X of the box body 20, the orthographic projection of the electrical connection member 40 is completely staggered from the orthographic projection of the connecting piece 60. In this way, the probability of direct electrical connection between the electrical connection member 40 and the plurality of electrode terminals 103 is reduced.

[0137] The connecting piece 60 is a connecting piece for realizing series-parallel connection of a plurality of battery cells 10. In some embodiments, the connecting piece 60 may be an aluminum sheet or a copper sheet.

[0138] The electrode terminal 103 is used to conduct the electrode assembly 102 in the housing assembly 101 with the external electrical device outside the housing assembly 101. The electrode terminal 103 can be set on the housing assembly 101. The electrode terminal 103 may include a first electrode terminal and a second electrode terminal, and the electrode assembly 102 includes a positive electrode tab and a negative electrode tab. The positive electrode tab is electrically connected to the first electrode terminal, and the negative electrode tab is electrically connected to the second electrode terminal. The positive electrode tab refers to a metal conductor that leads the positive electrode from the electrode assembly 102, and the negative electrode tab refers to a metal conductor that leads the negative electrode from the electrode assembly 102. The first electrode terminal 103 can form the positive electrode of the battery cell 10, and the second electrode terminal 103 can form the negative electrode of the battery cell 10. In some embodiments, the first electrode terminal 103 can be made of materials such as aluminum or aluminum alloy, and the second electrode terminal 103 can be made of materials such as copper or copper alloy.

[0139] In some embodiments, the electrode terminal 103 is arranged toward the side where the electrical connector 40 is located. In some embodiments, the first electrode terminals and the second electrode terminals of multiple battery cells 10 in the same battery cell group are arranged alternately along the second direction. For example, the first electrode terminal of the odd-numbered battery cell 10 in the same battery cell group is adjacent to the second electrode terminal of the even-numbered battery cell 10 in the second direction, and the first electrode terminal of the even-numbered battery cell 10 in the same battery cell group is adjacent to the second electrode terminal of the odd-numbered battery cell 10 in the second direction. The connecting piece 60 can electrically connect the first electrode terminal and the second electrode terminal adjacent to each other in the second direction to achieve electrical connection of multiple battery cells 10. Multiple battery cells 10 are electrically connected to ultimately form a total positive output pole and a total negative output pole. The total positive output pole and the junction box can be connected by an electrical connector, and the total negative output pole junction boxes can be connected by another electrical connector. That is, the battery device 100 may include at least two electrical connectors, one of which is used to realize the electrical connection between the total positive output electrode and the junction box, and the other of which is used to realize the electrical connection between the total negative output electrode and the junction box.

[0140] In the projection plane perpendicular to the height direction X of the box body 20 , the orthographic projection of the electrical connector 40 is completely offset from the orthographic projection of the connecting piece 60 , which means that in the projection plane perpendicular to the height direction X of the box body 20 , the orthographic projection of the electrical connector 40 is not overlapped with the orthographic projection of the connecting piece 60 .

[0141] In some embodiments, to reduce the probability of direct electrical connection between the conductive portion 4031 and the plurality of electrode terminals 103, the sum of the thicknesses of the second adhesive layer 50 and the insulating portion 4032 can be made greater than the thickness of the electrode terminal 103.

[0142] In some embodiments, to reduce the probability of direct electrical connection between the conductive portion 4031 and the plurality of electrode terminals 103, an insulating layer can be provided on the outer surface of the conductive portion 4031.

[0143] By making the orthographic projection of the electrical connector 40 partially overlap with the orthographic projections of two adjacent groups of battery cells simultaneously in the projection plane perpendicular to the height direction X of the box body 20, it is beneficial to increase the main frequency of the battery device 100.

[0144] Please continue to refer to Figures 6 - 8 , according to some embodiments of the present application, the battery device 100 further includes an upper cover 70. The upper cover 70 is covered on the box body 20. The upper cover 70 includes a convex portion 701 protruding towards the bottom plate 203. The convex portion 701 abuts against the surface of the third section 403 of the electrical connector 40 away from the bottom plate 203.

[0145] Please continue to refer to Figure 2 and Figures 4 - 10 , according to some embodiments of the present application, the electrical connector 40 further includes a buffer portion 4034 located on the side of the conductive portion 4031 of the third section 403 away from the bottom plate 203. The conductive portion 4031 abuts against the convex portion 701 through the buffer portion 4034.

[0146] The electrical connector 40 further including a buffer portion 4034 located on the side of the conductive portion 4031 of the third section 403 away from the bottom plate 203 means that there is a buffer portion 4034 between the convex portion 701 and the conductive portion 4031. The conductive portion 4031 abutting against the convex portion 701 through the buffer portion 4034 means that the conductive portion 4031 is pressed against the convex portion 701 through the buffer portion 4034.

[0147] In some embodiments, the material of the buffer portion 4034 can be foam.

[0148] The conductive portion 4031 abutting against the convex portion 701 through the buffer portion 4034 can achieve buffering and fixing between the conductive portion 4031 and the convex portion 701, absorb external impacts, improve the pressing reliability between the conductive portion 4031 and the convex portion 701, and reduce the risk of component failure caused by resonance.

[0149] Please continue to refer to Figure 2 , according to some embodiments of the present application, the frame 201 and the first beam 202 are further used to define a second accommodation cavity 20B. The second accommodation cavity 20B is used to accommodate a junction box.

[0150] The second receiving cavity 20B is a space for receiving a junction box, and the second receiving cavity 20B is located on one side of the first receiving cavity 20A.

[0151] In some embodiments, the first receiving cavity 20A and the second receiving cavity 20B are arranged along the length direction of the electrical connector 40. In some embodiments, in the projection plane perpendicular to the box body 20, the orthographic projection of the second receiving cavity 20B is rectangular.

[0152] In some embodiments, the first receiving cavity 20A and the second receiving cavity 20B can share the same first beam 202 or the same frame 201.

[0153] Please continue to refer to Figure 2 and Figures 4 - 12 , in some embodiments, the second section of the electrical connector 40 is electrically connected to the electrical connection terminal 30 through an adapter 80. The frame 201 and the first beam 202 are also used to define a third receiving cavity for receiving the adapter 80.

[0154] In some embodiments, the adapter 80 includes an electrically connected first adapter 801 and a second adapter 802. The first connector 801 includes a first hole H1 for the second section 402 to pass through and a second hole H2 for the first connection end 8021 of the second connector 802 to pass through, so as to realize the electrical connection between the second adapter 802 and the second section 402 of the electrical connector 40 through the first connector 801. The second connection end 8022 of the second connector 802 is arranged towards the position where the electrical connection terminal 30 is located and is electrically connected to the electrical connection terminal 30.

[0155] In some embodiments, the second receiving cavity 20B and the third receiving cavity are distributed on opposite sides of the first receiving cavity 20A along the length direction of the electrical connector 40.

[0156] By accommodating the junction box in the second receiving cavity 20B, the junction box can be integrated into the battery device 100, and the integration degree of the battery device 100 can be improved.

[0157] An embodiment of the present application provides an electrical device, which includes the battery device 100 in the above embodiment, and the battery device 100 is used to provide electrical energy.

[0158] The electrical device may include a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and so on.

[0159] In some embodiments, the electrical device is a new energy electric vehicle. Since the new energy electric vehicle has requirements for front-wheel drive and rear-wheel drive, the electrical connection terminals 30 and the junction box are respectively arranged on both sides of a plurality of battery cells 10, and the electrical connection between the electrical connection terminals 30 and the junction box is realized through the electrical connection member 40 to ensure the electrical energy demand of the electric vehicle under conditions such as rapid acceleration. The battery device 100 will experience many conditions during actual driving (such as vibration shock conditions, high and low temperature shock conditions, cyclic charge and discharge conditions, and simulated expansion conditions). When the above battery device 100 experiences the above conditions, it can meet the demand for stable main frequency.

[0160] It can be understood that since the electrical device provided in this application uses any one of the above battery devices 100, the electrical device has all the beneficial effects of the above battery device 100, which will not be elaborated here.

[0161] The embodiment of the present application provides an energy storage device, which includes the battery device 100 in the above embodiment, and the battery device 100 is used for storing electrical energy.

[0162] The energy storage device may include, but is not limited to, a centralized energy storage device (such as a container energy storage device), a distributed energy storage device, a movable energy storage device, a wearable energy storage device, and the like.

[0163] It can be understood that since the energy storage device provided in this application uses any one of the above batteries, the energy storage device has all the beneficial effects of the above battery, which will not be elaborated here.

[0164] A specific embodiment will be used below to describe the battery device 100 of the present application.

[0165] The embodiment of the present application provides a battery device 100, which includes a plurality of battery cells 10, a box body 20, a junction box, electrical connection terminals 30, electrical connection members 40, a second adhesive layer 50, connection pieces 60, and an upper cover 70.

[0166] The box body 20 includes a frame 201, a first beam 202 connected to the frame 201, and a bottom plate 203. The frame 201 and the first beam 202 are used to define a first accommodation cavity 20A for accommodating a plurality of battery cells 10 and a second accommodation cavity 20B for accommodating the junction box. The bottom plate 203 is used to carry a plurality of battery cells 10, and the plurality of battery cells 10 are electrically connected through the connection pieces 60.

[0167] The junction box is electrically connected to a plurality of battery cells 10, and the junction box is located on the side of the first beam 202 away from the battery cells 10.

[0168] The electrical connection terminals 30 are arranged on the frame 201, and the electrical connection terminals 30 are located on the side of the first accommodation cavity 20A away from the junction box.

[0169] Both ends of the electrical connector 40 are electrically connected to the junction box and the electrical connection terminal 30 respectively. The electrical connector 40 includes a first section 401 electrically connected to the junction box, a second section 402 electrically connected to the electrical connection terminal 30, and a third section 403 located between the first section 401 and the second section 402. Among them, the third section 403 is located on the side of the first beam 202 away from the bottom plate 203.

[0170] The third section 403 includes a conductive part 4031, a first adhesive layer 4033, an insulating part 4032, and a buffer part 4034 along the height direction X of the box body 20. The conductive part 4031 is used to realize the electrical connection between the first section 401 and the second section 402, and the thickness dimension of the conductive part 4031 is smaller than the width dimension of the conductive part 4031. The insulating part 4032 is located on the surface of the conductive part 4031 facing the bottom plate 203, and the insulating part 4032 is adhered to the conductive part 4031 through the first adhesive layer 4033. The insulating part 4032 is adhered to the surface of the battery cells 10 of two adjacent groups of battery cell groups away from the bottom plate 203 through the second adhesive layer 50, and in the projection plane perpendicular to the height direction X of the box body 20, the orthographic projection of the electrical connector 40 is completely staggered from the orthographic projection of the connecting piece 60 connecting the electrode terminals 103 of two adjacent battery cells 10. The insulating part 4032 is a molded plate. The buffer part 4034 is located on the side of the conductive part 4031 of the third section 403 away from the bottom plate 203.

[0171] The upper cover 70 is covered on the box body 20. The upper cover 70 includes a convex part 701 protruding towards the bottom plate 203. The convex part 701 abuts against the surface of the third section 403 of the electrical connector 40 away from the bottom plate 203, and the convex part 701 abuts against the conductive part 4031 through the buffer part 4034.

[0172] The battery device 100 provided by the embodiment of the present application can reduce the influence of the electrical connector 40 on the connection length of the frame 201 and the first beam 202, improve the overall anti-expansion performance and main frequency stability of the battery device 100, and can also improve the energy density of the battery device 100.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting 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 for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification 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 that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: Multiple battery cells; A box body, including a frame and a first beam connected to the frame, the frame and the first beam being used to define a first accommodation cavity for accommodating the multiple battery cells; A junction box, electrically connected to the multiple battery cells, the junction box being located on a side of the first beam away from the battery cells; Electrical connection terminals, arranged on the frame and located on a side of the first accommodation cavity away from the junction box; An electrical connector, with two ends of the electrical connector being electrically connected to the junction box and the electrical connection terminals respectively; And An upper cover, covering the box body, the upper cover including a convex portion protruding towards the inner side of the first accommodation cavity; Wherein, the electrical connector is configured to be bent in the height direction of the box body to cross over the first beam, and two opposite surfaces of the electrical connector in the height direction of the box body are respectively in contact with at least a part of the multiple battery cells and the convex portion.

2. The battery device according to claim 1, characterized in that, The box body further includes a bottom plate connected to the frame, the bottom plate being used to carry the multiple battery cells; The electrical connector includes a first section electrically connected to the junction box, a second section electrically connected to the electrical connection terminals, and a third section located between the first section and the second section; Wherein, the third section is located on a side of the first beam away from the bottom plate, and the third section is in contact with surfaces of at least a part of the multiple battery cells away from the bottom plate.

3. The battery device according to claim 2, wherein The third section of the electrical connector includes a conductive part and an insulating part in the height direction of the box body, the conductive part being used to achieve electrical connection between the first section and the second section; Wherein, the insulating part is located on a surface of the conductive part facing the bottom plate side and abuts against surfaces of at least a part of the multiple battery cells away from the bottom plate.

4. The battery device according to claim 3, characterized in that, The insulating part is made of an elastic material.

5. The battery device according to claim 3, characterized in that, The insulating part is a molded plate.

6. The battery device according to claim 3, characterized in that, The third section of the electrical connector further includes a first adhesive layer, and the insulating part is bonded to the conductive part through the first adhesive layer.

7. The battery device according to claim 3, characterized in that, The battery device further includes a second adhesive layer; wherein, the insulating part is bonded to surfaces of at least a part of the multiple battery cells away from the bottom plate through the second adhesive layer.

8. The battery device according to any one of claims 3 to 7, characterized in that, The thickness dimension of the conductive part is less than the width dimension of the conductive part.

9. The battery device according to any one of claims 3 to 7, characterized in that, The thickness dimension T of the conductive part and the width dimension W of the conductive part satisfy: 5 ≤ W / T ≤ 50.

10. The battery device according to any one of claims 3 to 7, characterized in that, The thickness dimension T of the conductive part satisfies: 0 < T ≤ 2 mm.

11. The battery device according to any one of claims 3 to 7, characterized in that, The width dimension W of the conductive part satisfies: 30 mm ≤ W ≤ 100 mm.

12. The battery device according to any one of claims 1 to 7, characterized in that, The multiple battery cells include multiple groups of battery cell groups arranged side by side in a first direction, and each group of battery cell groups includes at least one battery cell stacked in a second direction; In a projection plane perpendicular to the height direction of the box body, the orthographic projection of the electrical connector overlaps at least partially with the orthographic projections of two adjacent groups of battery cell groups.

13. The battery device according to any one of claims 3 to 7, characterized in that, The electrical connector further includes a buffer part on a side of the conductive part of the third section away from the bottom plate, and the conductive part abuts against the convex portion through the buffer part.

14. The battery device according to any one of claims 1 to 7, characterized in that, The border and the first beam are further configured to define a second receiving cavity for receiving the junction box.

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

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

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