Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device includes: a case; the battery monomer group is arranged in the box body, the battery monomer group comprises at least two battery monomers, each battery monomer comprises two electrode terminals which are arranged at intervals, the two electrode terminals are arranged at the same end of the battery monomer group in the second direction, the distance between the two electrode terminals in the second direction is L1, the size of the battery monomers in the second direction is L2, and the distance between the two electrode terminals in the second direction is L2; 0 < L1 < = L2 / 2; the two ends of the confluence piece are respectively connected to the electrode terminals of the two adjacent battery monomers in the first direction, and the electrode terminals are arranged at the same end of the battery monomer group in the second direction, so that the distance between the two electrode terminals of the battery monomers in the second direction is reduced; therefore, large-area spaces are formed on the two sides of the two electrode terminals to facilitate arrangement of other devices of the battery device, the compactness of the battery device is improved, the utilization rate of the internal space of the box body is enhanced, and the energy density of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In related technologies, several battery cells are arranged in a box body to form a battery device, and how to efficiently utilize the internal space of the battery box and improve the energy density of the battery device is an urgent problem to be solved. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the utilization rate of the internal space of the box body and the energy density of the battery device.

[0005] In a first aspect, the present application provides a battery device, including: a box body; a battery cell group arranged in the box body, the battery cell group including at least two battery cells arranged along a first direction, each battery cell including two electrode terminals arranged at intervals along a second direction, and both electrode terminals being arranged at the same end of the battery cell group in its second direction; a bus bar, the bus bar extending along the first direction, and two ends of the bus bar being respectively connected to one electrode terminal of two adjacent battery cells in the first direction to serially or parallelly connect the adjacent battery cells, the first direction and the second direction intersecting, wherein the distance L between the two electrode terminals in the second direction 1 , the size L of the battery cell in the second direction 2 , satisfy 0 < L 1 ≤ L 2 / 2.

[0006] In the solution of the embodiment of the present application, the battery device includes a box body, a battery cell group and a bus bar. The battery cell group is accommodated in the box body. The battery cell group includes at least two battery cells arranged along the first direction. Each battery cell includes two electrode terminals arranged at intervals along the second direction. The bus bar is connected to one electrode terminal of two adjacent battery cells in the first direction to serially or parallelly connect the adjacent battery cells. The bus bar extends along the first direction to reduce the processing difficulty of the bus bar and the matching difficulty between the bus bar and the battery cell. By arranging the electrode terminals at the same end of the battery cell group in its second direction, the distance between the two electrode terminals of the battery cell in the second direction is reduced, so that a larger area of space is formed on both sides of the two electrode terminals to facilitate the arrangement of other components of the battery device, improve the compactness of the battery device, help to enhance the utilization rate of the internal space of the box body, and improve the energy density of the battery device. The distance L between the two electrode terminals in the second direction1 The dimension L of the battery cell in the second direction 2 When the above conditions are met, the distance between the two electrode terminals of the battery cell in the second direction is reduced, so that a larger area of space is formed on both sides of the two electrode terminals to facilitate the arrangement of other components of the battery device, improve the compactness of the battery device, enhance the utilization rate of the internal space of the box body, and improve the energy density of the battery device.

[0007] In some embodiments, the two electrode terminals are a positive electrode terminal and a negative electrode terminal respectively. The arrangement of the positive electrode terminals and negative electrode terminals of two adjacent battery cells in the second direction is opposite in the first direction. The two ends of the bus bar are respectively connected to the positive electrode terminal and the negative electrode terminal of two adjacent battery cells to connect the adjacent battery cells in series.

[0008] In the solution of the embodiment of the present application, the arrangement of the positive electrode terminals and negative electrode terminals of two adjacent battery cells in the second direction is opposite in the first direction. The bus bar extends along the first direction and is connected to the positive electrode terminal and the negative electrode terminal of two adjacent battery cells, so that the adjacent battery cells are connected in series, reducing the processing difficulty of the bus bar and the matching difficulty between the bus bar and the battery cell.

[0009] In some embodiments, the two electrode terminals are a positive electrode terminal and a negative electrode terminal respectively. The arrangement of the positive electrode terminals or negative electrode terminals of two adjacent battery cells in the second direction is the same in the first direction. The two ends of the bus bar are respectively connected to the positive electrode terminal and the negative electrode terminal of two adjacent battery cells to connect the adjacent battery cells in parallel.

[0010] In the solution of the embodiment of the present application, the arrangement of the positive electrode terminals and negative electrode terminals of two adjacent battery cells in the second direction is the same in the first direction. The bus bar extends along the first direction and is connected to the positive electrode terminal or the negative electrode terminal of two adjacent battery cells, so that the adjacent battery cells are connected in parallel, reducing the processing difficulty of the bus bar and the matching difficulty between the bus bar and the battery cell, and the structures of the battery cells in the battery cell group are the same, reducing the preparation difficulty of the battery cell group.

[0011] In some embodiments, the battery cell further includes a housing and a first insulating member. The two electrode terminals extend out of the housing in the third direction. The first insulating member is connected to the housing and disposed between the two electrode terminals. The first direction, the second direction, and the third direction intersect pairwise.

[0012] In the solution of the embodiment of the present application, the battery cell further includes a housing and a first insulating member. The two electrode terminals extend out of the housing in the third direction to be connected to the bus bar. The first insulating member is connected to the housing to improve the stability of the insulating member. By disposing the insulating member between the two electrode terminals, the problem of reduced insulation performance between the two electrode terminals due to the reduced distance between the two electrode terminals is improved, and the reliability of the battery device is improved.

[0013] In some embodiments, an orthographic projection of at least one electrode terminal in the second direction is located on the first insulating member.

[0014] In the solution of the embodiment of the present application, the orthographic projection of the electrode terminal in the second direction is located on the first insulating member, so that the insulating member can separate the two electrode terminals, reduce the risk of accidental conduction of the two electrode terminals causing a short circuit of the battery cell, and improve the reliability of the battery device.

[0015] In some embodiments, the first insulating member extends along the third direction, and at least a portion of the orthographic projection of the busbar in the second direction is located on the insulating member.

[0016] In the scheme of the embodiment of the present application, the first insulating member extends along the third direction, and at least part of the positive projection of the busbar in the second direction is located on the first insulating member, so that the first insulating member can be used to separate two adjacent busbars in the second direction, so as to improve the problem of reduced insulation performance between the two busbars due to the reduced distance between the two busbars, thereby improving the reliability of the battery device.

[0017] In some embodiments, two battery cell groups are spaced apart along the second direction, and the electrode terminal is arranged at one end of the battery cell close to the other battery cell group in the second direction. The two electrode terminals of the battery cell are respectively a first terminal and a second terminal, and the first terminal is located between the second terminal and the other battery cell group. The battery cell of at least one battery cell group also includes a shell and a second insulating member, and the two electrode terminals extend out of the shell along the third direction. The second insulating member is connected to the shell and is arranged on the side of the first terminal away from the second terminal in the second direction, and the first direction, the second direction and the third direction intersect with each other.

[0018] In the scheme of the embodiment of the present application, two battery cell groups are arranged at intervals along the second direction, and the electrode terminal is arranged at one end of the battery cell close to the other battery cell group in the second direction. The two electrode terminals are respectively a first terminal and a second terminal. The battery cell of at least one battery cell group also includes a second insulating member, and the second insulating member is located on the side of the first terminal away from the second terminal in the second direction. The electrode terminals located in two adjacent battery cell groups are separated by the second insulating member to improve the problem of reduced spacing between the electrode terminals of two adjacent battery cell groups and reduced insulation performance between the two electrode terminals, thereby improving the reliability of the battery device.

[0019] In some embodiments, at least a portion of the orthographic projections of the busbars of two adjacent battery cell groups in the second direction are located on the second insulating member.

[0020] In the solution of the embodiment of the present application, at least a partial orthographic projection of the bus bars of two adjacent battery cell groups in the second direction is located on the second insulating member, so that the insulating member can be used to separate the bus bars provided in the two battery cell groups, so as to improve the problem that the insulation performance between the two bus bars is reduced due to the reduction of the distance between the two bus bars in the second direction, and improve the reliability of the battery device.

[0021] In some embodiments, the bus bar further includes an insulating layer, and the insulating layer is disposed on at least a partial surface of the bus bar facing other electrode terminals in its second direction.

[0022] In the solution of the embodiment of the present application, by disposing the insulating layer on at least a partial surface of the bus bar facing other electrode terminals in its second direction, the insulation reliability between two adjacent bus bars in the second direction is enhanced.

[0023] In some embodiments, the electrode terminal includes an end face in its third direction, the end face includes a connection area, the bus bar is connected to the connection area, and the two connection areas of the two electrode terminals disposed on the battery cell are disposed away from each other in the second direction, and the first direction, the second direction, and the third direction intersect pairwise.

[0024] In the solution of the embodiment of the present application, the bus bar is connected to the connection area of the electrode terminal, and the two connection areas of the two electrode terminals disposed on the same battery cell are disposed away from each other in the second direction, so as to increase the distance between the two bus bars respectively connected to the two electrode terminals, and improve the insulation performance between two adjacent bus bars.

[0025] In some embodiments, the box body includes a box body and a cover plate, the box body includes a chamber with an opening at one end in the third direction, the cover plate covers the opening, the battery cell group and the bus bar are accommodated in the chamber, the cover plate includes a protruding portion and a connecting portion connected to each other, a groove is formed on one side of the protruding portion facing the chamber, the bus bar and at least a partial electrode terminal are accommodated in the groove, and the distance L from the surface of the connecting portion facing away from the chamber to the battery cell 3 , the distance L from the surface of the protruding portion facing away from the chamber to the battery cell 4 , satisfy L 3 <L 4 , the connecting portion covers a partial battery cell, and the first direction, the second direction, and the third direction intersect pairwise.

[0026] In the solution of the embodiment of the present application, the cover plate includes a protruding portion and a connecting portion connected to each other. A groove is formed on one side of the protruding portion facing the chamber. The current collector and at least part of the electrode terminals are accommodated in the groove to reduce the risk of damage to the battery cell caused by the mutual extrusion of the cover plate and the electrode terminals. The connecting portion covers part of the battery cell, and the distance from the surface of the connecting portion facing away from the chamber to the battery cell is less than the distance from the surface of the protruding portion facing away from the chamber to the battery cell, so that the top cover and the battery cell are better adapted, reducing the volume of the battery device without damaging the battery cell and improving the energy density of the battery device.

[0027] In a second aspect, an electrical device provided by an embodiment of the present application includes the battery device according to any one of the above first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0029] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0030] Figure 2 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0031] Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the application;

[0032] Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application;

[0033] Figure 5 is an exploded view of a battery device provided by an embodiment of the present application;

[0034] Figure 6 is a top view of a battery cell of a battery device provided by an embodiment of the present application;

[0035] Figure 7 is a schematic structural diagram of a battery cell group of a battery device provided by an embodiment of the present application;

[0036] Figure 8 is a schematic structural diagram of a battery cell group of a battery device provided by an embodiment of the present application;

[0037] Figure 9 is a schematic structural diagram of a battery cell of a battery device provided by an embodiment of the present application;

[0038] Figure 10 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application;

[0039] Figure 11 is a structural schematic diagram of a battery cell of a battery device provided by an embodiment of the present application;

[0040] Figure 12 is a partial structural schematic diagram of a battery device provided by another embodiment of the present application;

[0041] Figure 13 is a structural schematic diagram of a battery device provided by another embodiment of the present application;

[0042] Figure 14 is a structural schematic diagram of a battery cell of a battery device provided by another embodiment of the present application;

[0043] Figure 15 is a structural schematic diagram of a bus bar of a battery device provided by an embodiment of the present application;

[0044] Figure 16 is a partial structural schematic diagram of a battery cell of a battery device provided by another embodiment of the present application;

[0045] Figure 17 is Figure 5 a cross-sectional view taken along line A-A in

[0046] Reference numerals:

[0047] 1, vehicle; 101, motor; 102, controller; 2, battery device; 201, battery module; 202, box body; 2021, first box body; 2022, second box body;

[0048] 3, battery cell;

[0049] 4, housing;

[0050] 5, electrode assembly; 51, tab; 52, electrode body;

[0051] 6, end cap assembly; 61, electrode terminal; 611, positive terminal; 612, negative terminal; 613, end face; 614, connection area; 62, first terminal; 63, second terminal;

[0052] 7, battery cell group;

[0053] 8, bus bar; 81, top surface; 82, bottom surface; 83, side surface;

[0054] 91, first insulating member; 92, second insulating member; 93, insulating layer; 94, box body; 95, cover plate; 951, protruding portion; 952, connecting portion; 96, groove;

[0055] X, the first direction; Y, the second direction; Z, the third direction. Detailed implementation manners

[0056] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and should not be used to limit the protection scope of the present application.

[0057] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0058] In the description of the embodiments of the present application, the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the accompanying 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 thus should not be construed as a limitation on the embodiments of the present application.

[0059] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0060] 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 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 situations.

[0061] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0062] Currently, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of battery devices, the market demand for them is also constantly increasing.

[0063] A number of battery cells are arranged in a box body to form a battery device, and the utilization rate of the internal space of the box body still needs to be improved.

[0064] The reason for the above problem is that there is an accommodation space formed between the box cover and the battery cell, which is to prevent the box cover from squeezing the electrode terminals and the bus bar. In the related art, the battery cell includes two electrode terminals arranged at intervals, and the electrode terminals arranged at intervals divide the accommodation space into at least three sections in the second direction, but the space of each section is relatively small, and it is not easy to arrange other components, resulting in a decrease in the utilization rate of the internal space of the box body.

[0065] Based on the above problems, the embodiments of the present application provide a battery device, which includes a box body, a battery cell group and a bus bar. The battery cell group is accommodated in the box body. The battery cell group includes at least two battery cells arranged in the first direction. Each battery cell includes two electrode terminals arranged at intervals in the second direction. The bus bar is connected to an electrode terminal of two adjacent battery cells in the first direction to connect the adjacent battery cells in series or in parallel. The bus bar extends in the first direction to reduce the processing difficulty of the bus bar and the matching difficulty between the bus bar and the battery cell. By arranging the electrode terminals at the same end of the battery cell group in its second direction, the distance between the two electrode terminals of the battery cell in the second direction is reduced, so that a larger area of space is formed on both sides of the two electrode terminals to facilitate the arrangement of other devices of the battery device, improve the compactness of the battery device, help to enhance the utilization rate of the internal space of the box body, and improve the energy density of the battery device.

[0066] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0067] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical devices.

[0068] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0069] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of the present application do not limit this either.

[0070] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application can include a battery module, a battery pack, etc. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0071] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collecting portion and a positive electrode tab connected to the positive current collecting portion, the positive current collecting portion is coated with the positive active material layer, and the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collecting portion and a negative electrode tab connected to the negative current collecting portion, the negative current collecting portion is coated with the negative active material layer, and the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0072] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the battery devices and electrical equipment described above, but also applicable to all battery devices including a box body and electrical equipment using the battery device. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0073] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1 provided in some embodiments of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1. For example, the battery device 2 can be used as an operating power source of the vehicle 1. The vehicle 1 may further include a controller 102 and a motor 101, and the controller 102 is used to control the battery to supply power to the motor 101. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0074] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0075] Figure 2 shows a schematic structural diagram of a battery device according to an embodiment of the present application.

[0076] The battery device 2 mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, parallel or in a hybrid connection through a busbar component.

[0077] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 3.

[0078] As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling a plurality of battery cells 3 with a cable tie.

[0079] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body 202 and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body 202.

[0080] As an example, the battery cell assembly may be a battery module 201, and the battery cell assembly may be accommodated in the box body by fixing the battery module 201 in the box body.

[0081] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing a plurality of battery cells 3 to the box body 202.

[0082] As an example, the box body 202 may include a first box body 2021 and a second box body 2022. The first box body 2021 and the second box body 2022 are snapped together so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly. The "closed" here means covering or closing, which may be sealed or non-sealed. The first box body 2021 may be a top cover or a bottom plate.

[0083] As an example, the box body 202 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0084] In some embodiments, the box body 202 may be part of the chassis structure of a vehicle. For example, a part of the box body 202 may become at least a part of the floor of the vehicle, or a part of the box body 202 may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0085] Figure 3 The structural schematic diagram of the battery module 201 according to an embodiment of the present application is shown.

[0086] In some embodiments, such as Figure 2 and Figure 3As shown, there are multiple battery cells 3. Multiple battery cells 3 are first connected in series, parallel, or in a hybrid connection to form a battery module 201. Multiple battery modules 201 are then connected in series, parallel, or in a hybrid connection to form an integral unit and are housed within a housing 202.

[0087] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or hybrid connection of the multiple battery cells 3 in the battery module 201.

[0088] Figure 4 is an exploded view of a battery cell provided in an embodiment of the present application. A battery cell 3 refers to the smallest unit that makes up a battery device. For example Figure 4 , the battery cell 3 includes an end cap assembly 6, a housing 4, and an electrode assembly 5.

[0089] The electrode assembly 5 is the component in the battery cell 3 where an electrochemical reaction occurs. The housing 4 can contain one or more electrode assemblies 5. The electrode assembly 5 is mainly formed by winding or stacking electrode sheets. The electrode sheets are divided into positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active material constitute the electrode body 52, and the parts of the positive electrode sheet and the negative electrode sheet without active material respectively constitute the electrode tabs 51. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 52 together or at both ends of the electrode body 52 respectively. During the charging and discharging process of the battery cell 3, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs 51 are connected to the electrode terminals 61 to form a current loop.

[0090] The electrode assembly 5 can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0091] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0092] In some embodiments, the electrode assembly 5 is a stacked structure. As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively. The multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked. Multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheet or negative electrode sheet, or the separator can be continuously provided and is arranged between any adjacent positive electrode sheet or negative electrode sheet in a folded manner.

[0093] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or multi - prism - shaped, etc.

[0094] In some embodiments, the electrode assembly 5 is provided with electrode tabs, and the electrode tabs can conduct current out of the electrode assembly. The electrode tabs include a positive electrode tab and a negative electrode tab.

[0095] The battery cell 3 may include a housing 4. The housing 4 is a component for cooperating with the end cap assembly 6 to form the internal environment of the battery cell 3. Among them, the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure), and other components. The housing 4 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc. In some embodiments, the housing 4 can be a sealed structure or a non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 plays a role in protecting the electrode assembly 5, and there is also a sealed bag between the housing 4 and the electrode assembly 5. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating part or an aluminum plastic film. When the housing 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0096] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no special limitation in this application.

[0097] The housing 4 and the end cap assembly 6 can be independent components. One or more openings can be provided on the housing 4, and one or more end cap assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly 6 and the housing 4 can also be integrated. Optionally, the end cap assembly 6 and the housing 4 can form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 4, the end cap assembly 6 is then made to cover the housing 4.

[0098] In some embodiments, the electrode terminal 61 can be provided on the end cap assembly 6 or on the housing 4. The electrode terminal 61 is electrically connected to the tab 51. The electrode terminal 61 can be directly connected to the tab 51 or indirectly connected to the tab 51 through a transfer mechanism.

[0099] Please refer to Figures 5 to 8 , Figure 5 which is an exploded view of a battery device provided by an embodiment of the present application; Figure 6 which is a top view of the battery cell of the battery device provided by an embodiment of the present application; Figure 7 which is a schematic structural diagram of a battery cell group of the battery device provided by an embodiment of the present application; Figure 8 which is a schematic structural diagram of a battery cell group of the battery device provided by an embodiment of the present application.

[0100] In the first aspect, as Figures 4 to 8As shown in the figure, the present application provides a battery device 2, which includes a box body 202, a battery cell group 7 and a bus bar 8. The battery cell group 7 is arranged in the box body 202. The battery cell group 7 includes at least two battery cells 3 arranged along a first direction X. Each battery cell 3 includes two electrode terminals 61 spaced apart along a second direction Y. The two electrode terminals 61 are arranged at the same end of the battery cell group 7 in the second direction Y. The bus bar 8 extends along the first direction X, and both ends of the bus bar 8 are respectively connected to one electrode terminal 61 of two adjacent battery cells 3 in the first direction X to connect adjacent battery cells 3 in series or in parallel. The first direction X and the second direction Y intersect.

[0101] In the solution of the embodiment of the present application, the battery device 2 includes a box body 202, a battery cell group 7 and a bus bar 8. The battery cell group 7 is accommodated in the box body 202. The battery cell group 7 includes at least two battery cells 3 arranged along a first direction X. Each battery cell 3 includes two electrode terminals 61 spaced apart along a second direction Y. The bus bar 8 is connected to one electrode terminal 61 of two adjacent battery cells 3 in the first direction X to connect adjacent battery cells 3 in series or in parallel. The bus bar 8 extends along the first direction X to reduce the processing difficulty of the bus bar 8 and the matching difficulty between the bus bar 8 and the battery cell 3. By arranging the electrode terminals 61 at the same end of the battery cell group 7 in the second direction Y, the distance between the two electrode terminals 61 of the battery cell 3 in the second direction Y is reduced, so that a larger area of space is formed on both sides of the two electrode terminals 61 to facilitate the arrangement of other components of the battery device 2, improve the compactness of the battery device 2, help enhance the utilization rate of the internal space of the box body 202, and improve the energy density of the battery device 2.

[0102] The battery cell group 7 includes at least two battery cells 3 arranged along a first direction X, and each battery cell 3 is electrically connected to each other. Exemplarily, the battery cell group 7 includes 2 or 3 or 5 or 10 battery cells 3, etc.

[0103] One battery cell group 7 can be accommodated in the box body 202, or at least two battery cell groups 7 are arranged along the second direction Y in the box body 202, and the number of battery cells 3 in each battery cell group 7 is the same or different. Exemplarily, 1 or 2 or 3 or 5 battery cell groups 7 are arranged in the box body 202, etc.

[0104] The battery cell 3 includes two electrode terminals 61 spaced apart in the second direction Y. The two electrode terminals 61 are respectively a positive electrode terminal 611 and a negative electrode terminal 612. The positive electrode terminal 611 is connected to the positive electrode plate of the electrode assembly 5, and the negative electrode terminal 612 is connected to the negative electrode plate of the electrode assembly 5.

[0105] The battery cell 3 includes two half regions oppositely arranged in the second direction Y, namely a first half region and a second half region. Within the same battery cell group 7, both electrode terminals 61 of the battery cell 3 are located in the first half region, or both electrode terminals 61 are located in the second half region, so that the structures of the battery cells 3 are similar or the same, reducing the processing difficulty of the battery cells 3 and the connection difficulty between the bus bar 8 and the battery cells 3.

[0106] Since both electrode terminals 61 are accommodated in the same half region, at least one large space with the size of a half region is formed on one side of the two electrode terminals 61 in the second direction Y. This space can be used to accommodate other devices of various sizes, so as to reasonably arrange the positions of the components in the box body 202 and improve the utilization rate of the internal space of the box body 202. Exemplarily, this space can accommodate at least part of the cover plate 95 of the box body 202 or this space can accommodate the water-cooling plate.

[0107] Optionally, within the same battery cell group 7, the two electrode terminals 61 of adjacent battery cells 3 are arranged at intervals along the first direction X.

[0108] The bus bar 8 can be a bus bar piece. Exemplarily, the bus bar 8 can be a copper bus bar or an aluminum bus bar, etc. Exemplarily, the bus bar 8 is connected to the electrode terminal 61 by welding or clamping.

[0109] A plurality of bus bars 8 extending in the first direction X are arranged in the box body 202. The bus bar 8 is connected to the electrode terminals 61 of two adjacent battery cells 3 in the first direction X in the battery cell group 7 to connect the adjacent battery cells 3 in series or in parallel.

[0110] Exemplarily, the bus bar 8 extends in the first direction X and is connected to the electrode terminal 61 of the adjacent battery cell 3, which means that the bus bar 8 includes a contact area. The bus bar 8 is in direct contact with the electrode terminal 61 through the contact area, and the two contact areas connected to the electrode terminals 61 of the adjacent battery cell 3 are arranged opposite to each other in the first direction X.

[0111] In some embodiments, as Figures 4 to 6 shown, the distance L between the two electrode terminals 61 in the second direction Y 1 , and the size L of the battery cell 3 in the second direction Y 2 , satisfy 0 < L 1 ≤ L 2 / 2.

[0112] In these embodiments, the distance L between the two electrode terminals 61 in the second direction Y 1 , and the size L of the battery cell 3 in the second direction Y 2, when the above conditions are met, the distance between the two electrode terminals 61 of the battery cell 3 in the second direction Y is reduced, so that a larger area of space is formed on both sides of the two electrode terminals 61 to facilitate the arrangement of other components of the battery device 2, improve the compactness of the battery device 2, enhance the utilization rate of the internal space of the box body 202, and improve the energy density of the battery device 2.

[0113] Optionally, the distance L between the two electrode terminals 61 in the second direction Y 1 , satisfying 15mm ≤ L 1 ≤ 150mm. Exemplarily, the distance L between the two electrode terminals 61 in the second direction Y 1 is 15mm or 30mm or 65mm or 150mm, etc.

[0114] In some embodiments, as Figure 5 and Figure 7 shown, the two electrode terminals 61 are respectively a positive electrode terminal 611 and a negative electrode terminal 612. In the first direction X, the arrangement of the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3 in the second direction Y is opposite. The two ends of the bus bar 8 are respectively connected to the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3 to connect the adjacent battery cells 3 in series.

[0115] In these embodiments, in the first direction X, the arrangement of the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3 in the second direction Y is opposite. The bus bar 8 extends along the first direction X and is connected to the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3, so that the adjacent battery cells 3 are connected in series, reducing the processing difficulty of the bus bar 8 and the matching difficulty between the bus bar 8 and the battery cell 3.

[0116] Since the two electrode terminals 61 of the battery cell 3 are arranged at one end of the battery cell group 7 in its second direction Y, the distance between the two bus bars 8 connected to the two electrode terminals 61 spaced in the second direction Y is small. Therefore, in the embodiments of the present application, the bus bar 8 extends along the first direction X and the electrode terminal 61, which helps to reduce the assembly difficulty of the battery device 2.

[0117] The arrangement of the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3 in the second direction Y is opposite, specifically referring to that the battery cell group 7 includes a first end and a second end oppositely arranged in the second direction Y. Then, among two adjacent battery cells 3 within the same battery cell group 7, the positive electrode terminal 611 of one battery cell 3 is closer to the first end than the negative electrode terminal 612, and the negative electrode terminal 612 of the other battery cell 3 is closer to the first end than the positive electrode terminal 611.

[0118] Exemplarily, in two adjacent battery cells 3, the positive terminal 611 of one battery cell 3 and the negative terminal 612 of the other battery cell 3 are arranged opposite to each other in the first direction X. One end of the bus bar 8 is connected to the positive terminal 611 of one battery cell 3, and the other end is connected to the negative terminal 612 of the other battery cell 3, so that the adjacent battery cells 3 are connected in series through the bus bar 8.

[0119] In some embodiments, as Figure 5 and Figure 8 shown, the two electrode terminals 61 are respectively a positive terminal 611 and a negative terminal 612. The positive terminals 611 or the negative terminals 612 of two adjacent battery cells 3 in the first direction X are arranged in the same manner in the second direction Y. Both ends of the bus bar 8 are respectively connected to the positive terminal 611 and the negative terminal 612 of two adjacent battery cells 3 to connect the adjacent battery cells 3 in parallel.

[0120] In these embodiments, the positive terminals 611 and the negative terminals 612 of two adjacent battery cells 3 in the first direction X are arranged in the same manner in the second direction Y. The bus bar 8 extends along the first direction X and is connected to the positive terminal 611 or the negative terminal 612 of two adjacent battery cells 3, so that the adjacent battery cells 3 are connected in parallel, reducing the processing difficulty of the bus bar 8 and the matching difficulty between the bus bar 8 and the battery cell 3. Moreover, the structures of the battery cells 3 in the battery cell group 7 are the same, reducing the preparation difficulty of the battery cell group 7.

[0121] The positive terminals 611 or the negative terminals 612 of two adjacent battery cells 3 are arranged in the same manner in the second direction Y, specifically meaning that the battery cell group 7 includes a first end and a second end that are oppositely arranged in the second direction Y. Among two adjacent battery cells 3 in the same battery cell group 7, their positive terminals 611 are closer to the first end than their negative terminals 612.

[0122] Exemplarily, in two adjacent battery cells 3, the positive terminals 611 or the negative terminals 612 of the two battery cells 3 are arranged opposite to each other in the first direction X. Both ends of the bus bar 8 are connected to the positive terminals 611 of the adjacent battery cells 3, or both ends of the bus bar 8 are connected to the negative terminals 612 of the adjacent battery cells 3, so that the adjacent battery cells 3 are connected in series through the bus bar 8.

[0123] Optionally, at least two battery cell groups 7 are arranged in the box body 202. The battery cells 3 in each battery cell group 7 are connected in parallel, and the battery cell groups 7 are connected in series to increase the voltage of the battery device 2.

[0124] Please refer to Figure 9 and Figure 10 , Figure 9It is a schematic structural diagram of a battery cell of a battery device provided by an embodiment of the present application; Figure 10 It is a schematic partial structural diagram of a battery device provided by an embodiment of the present application.

[0125] In some embodiments, as Figure 9 and Figure 10 shown, the battery cell 3 further includes a housing 4 and a first insulating member 91. Two electrode terminals 61 extend out of the housing 4 along the third direction Z. The first insulating member 91 is connected to the housing 4 and disposed between the two electrode terminals 61. The first direction X, the second direction Y, and the third direction Z intersect pairwise.

[0126] In these embodiments, the battery cell 3 further includes a housing 4 and a first insulating member 91. Two electrode terminals 61 extend out of the housing 4 along the third direction Z to be connected to the bus bar 8. The insulating member is connected to the housing 4 to improve the stability of the insulating member. By disposing the insulating member between the two electrode terminals 61, the problem of reduced insulation performance between the two electrode terminals 61 due to the reduced distance between the two electrode terminals 61 is improved, and the reliability of the battery device 2 is enhanced.

[0127] The two electrode terminals 61 extend out of the housing 4 on the same surface in the first direction X or the second direction Y or the third direction Z. The first insulating member 91 is connected to the outer surface of the housing 4 and disposed between the two electrode terminals 61.

[0128] Exemplarily, the first insulating member 91 and the two electrode terminals 61 are disposed on the same surface of the housing 4 in the first direction X or the second direction Y or the third direction Z, or the surface where the first insulating member 91 is connected to the housing 4 is not the surface where the electrode terminals 61 extend out of the housing 4. Then at least part of the first insulating member 91 extends between the two electrode terminals 61.

[0129] When the first insulating member 91 is disposed between the two electrode terminals 61, at least part of the positive projection of the electrode terminal 61 in the second direction Y is located on the first insulating member 91, and the insulation reliability between the two electrode terminals 61 is enhanced by the first insulating member 91.

[0130] Optionally, the connection manner between the first insulating member 91 and the housing 4 can be bonding, injection molding connection, snap connection, etc.

[0131] Optionally, the shape and size of the first insulating member 91 can be designed by itself. Exemplarily, the first insulating member 91 is rectangular or circular, etc.

[0132] Optionally, the thickness of the first insulating member 91 is between 1 mm and 3 mm. Exemplarily, the thickness of the first insulating member 91 is 1 mm, 2 mm, or 3 mm, etc.

[0133] Exemplarily, the first insulating member 91 may be a plastic member, a silicone member, a rubber member, or the like.

[0134] In some embodiments, as Figure 9 and Figure 10 shown, the positive projection of at least one electrode terminal 61 in the second direction Y is located on the first insulating member 91.

[0135] In these embodiments, the positive projection of the electrode terminal 61 in the second direction Y is located on the first insulating member 91, so that the first insulating member 91 can separate the two electrode terminals 61, reducing the risk of accidental conduction between the two electrode terminals 61 and causing a short circuit of the battery cell 3, and improving the reliability of the battery device 2.

[0136] One of the two electrode terminals 61, its positive projection in the second direction Y is located on the first insulating member 91; or the positive projections of the two electrode terminals 61 in the second direction Y are both located on the first insulating member 91, so that the first insulating member 91 can separate the two electrode terminals 61.

[0137] Exemplarily, the dimension of the first insulating member 91 in the first direction X is not less than the dimension of the electrode terminal 61 in the first direction X, and the dimension of the first insulating member 91 in the third direction Z is not less than the dimension of the electrode terminal 61 in the third direction Z, so that the positive projection of the electrode terminal 61 in the second direction Y is located within the first insulating member 91.

[0138] Please refer to Figure 11 , Figure 11 which is a schematic structural diagram of a battery cell of a battery device provided in an embodiment of the present application.

[0139] In some embodiments, as Figures 9 to 11 shown, the first insulating member 91 extends along the third direction Z, and at least a part of the positive projection of the current collector 8 in the second direction Y is located on the insulating member.

[0140] In these embodiments, the first insulating member 91 extends along the third direction Z, and at least a part of the positive projection of the current collector 8 in the second direction Y is located on the first insulating member 91, so that the first insulating member 91 can be used to separate two current collectors 8 adjacent in the second direction Y, so as to improve the problem of reduced insulation performance between the two current collectors 8 due to the reduced distance between the two current collectors 8, and improve the reliability of the battery device 2.

[0141] The two current collectors 8 are arranged at intervals in the second direction Y and are respectively connected to one of the positive terminal 611 and the negative terminal 612 of the battery cell 3. One end of the first insulating member 91 is connected to the housing 4, and the other end extends along the third direction Z between the two current collectors 8 to enhance the insulation reliability of the two current collectors 8 adjacent in the second direction Y.

[0142] Optionally, the size of the first insulating member 91 in the first direction X is the same as the size of the shell 4 in the first direction X, so as to increase the extension size of the first insulating member 91 between two adjacent busbars 8 in the second direction Y and improve the insulation performance of the first insulating member 91.

[0143] Optionally, in the battery cell group 7, the first insulating members 91 of two adjacent battery cells 3 are connected to each other in the first direction X to increase the size of the first insulating member 91 between two adjacent busbars 8 in the second direction Y, so that the first insulating member 91 can more reliably separate the two adjacent busbars 8 in the second direction Y.

[0144] See also Figures 12 to 14 , Figure 12 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application; Figure 13 is a schematic structural diagram of a battery device provided in another embodiment of the present application; Figure 14 It is a schematic structural diagram of a battery cell of a battery device provided in another embodiment of the present application.

[0145] In some embodiments, Figures 12 to 14 As shown, two battery cell groups 7 are arranged at intervals along the second direction Y, and the electrode terminal 61 is arranged at one end of the battery cell 3 close to the other battery cell group 7 in the second direction Y. The two electrode terminals 61 of the battery cell 3 are respectively a first terminal 62 and a second terminal 63, and the first terminal 62 is located between the second terminal 63 and the other battery cell group 7. The battery cell 3 of at least one battery cell group 7 also includes a shell 4 and a second insulating member 92. The two electrode terminals 61 extend out of the shell 4 along the third direction Z. The second insulating member 92 is connected to the shell 4 and is arranged on the side of the first terminal 62 away from the second terminal 63 in the second direction Y. The first direction X, the second direction Y and the third direction Z intersect each other.

[0146] In these embodiments, two battery cell groups 7 are arranged at intervals along the second direction Y, and the electrode terminal 61 is arranged at one end of the battery cell 3 close to the other battery cell group 7 in the second direction Y. The two electrode terminals 61 are respectively a first terminal 62 and a second terminal 63. The battery cell 3 of at least one battery cell group 7 also includes a second insulating member 92, and the second insulating member 92 is located on the side of the first terminal 62 away from the second terminal 63 in the second direction Y. The second insulating member 92 is used to separate the electrode terminals 61 located in two adjacent battery cell groups 7, so as to improve the problem that the spacing between the electrode terminals 61 of the two adjacent battery cell groups 7 is reduced and the insulation performance between the two electrode terminals 61 is reduced, thereby improving the reliability of the battery device 2.

[0147] The interior of the box body 202 includes two battery cell groups 7 arranged at intervals along the second direction Y. The electrode terminals 61 in the two battery cell groups 7 are arranged close to each other in the second direction Y, or in other words, the electrode terminals 61 are arranged at one end of the battery cell group 7 close to the other battery cell group 7 in the second direction Y.

[0148] The two electrode terminals 61 of the battery cell 3 are respectively a first terminal 62 and a second terminal 63. The first terminal 62 is one of the positive terminal 611 and the negative terminal 612, and the second terminal 63 is the other of the positive terminal 611 and the negative terminal 612. The first terminal 62 is closer to the other battery cell group 7 than the second terminal 63 in the second direction Y.

[0149] The battery cell 3 of one of the two battery cell groups 7 in the box body 202 is provided with a second insulating member 92, or the battery cells 3 of the two battery cell groups 7 in the box body 202 are all provided with a second insulating member 92.

[0150] Optionally, the connection manner between the second insulating member 92 and the housing 4 is bonding, injection molding connection, snap connection, etc.

[0151] Since the distance between the electrode terminals 61 of the two battery cell groups 7 in the box body 202 in the second direction Y is very small, in the embodiments of the present application, a second insulating member 92 is provided between the first terminals 62 of the adjacent two battery cell groups 7, and the insulation reliability of the adjacent first terminals 62 is improved through the second insulating member 92.

[0152] Optionally, a first insulating member 91 and a second insulating member 92 are provided on the battery cell 3 of at least one battery cell group 7.

[0153] Optionally, the positive projection of the first terminal 62 in the second direction Y is all located on the second insulating member 92.

[0154] In some embodiments, as Figures 12 to 14 shown, at least a part of the positive projection of the bus bar 8 of the adjacent two battery cell groups 7 in the second direction Y is located on the second insulating member 92.

[0155] In these embodiments, at least a part of the positive projection of the bus bar 8 of the adjacent two battery cell groups 7 in the second direction Y is located on the second insulating member 92, so that the insulating member can be used to separate the bus bars 8 provided in the two battery cell groups 7, so as to improve the problem that the insulation performance between the two bus bars 8 is reduced due to the reduction of the distance between the two bus bars 8 in the second direction Y, and the reliability of the battery device 2 is improved.

[0156] The bus bars 8 connected to the two battery cell groups 7 are spaced apart in the second direction Y. One end of the second insulating member 92 is connected to the housing 4, and the other end extends in the third direction Z between two adjacent bus bars 8 to enhance the insulation reliability between two adjacent bus bars 8 in the second direction Y.

[0157] Optionally, the dimension of the second insulating member 92 in the first direction X is the same as that of the housing 4 in the first direction X, so as to increase the extension dimension of the second insulating member 92 between two adjacent bus bars 8 in the second direction Y and improve the insulation performance of the second insulating member 92.

[0158] Optionally, within the battery cell group 7, the second insulating members 92 of two adjacent battery cells 3 are connected to each other in the first direction X, so as to increase the dimension of the second insulating member 92 between two adjacent bus bars 8 in the second direction Y, so that the second insulating member 92 more reliably separates two adjacent bus bars 8 in the second direction Y.

[0159] Please refer to Figure 15 , Figure 15 which is a schematic structural diagram of the bus bar of the battery device provided by an embodiment of the present application.

[0160] In some embodiments, as Figure 5 and Figure 15 shown, the bus bar 8 further includes an insulating layer 93, and the insulating layer 93 is disposed on at least a part of the surface of the bus bar 8 facing other electrode terminals 61 in its second direction Y.

[0161] In these embodiments, by disposing the insulating layer 93 on at least a part of the surface of the bus bar 8 facing other electrode terminals 61 in its second direction Y, the insulation reliability between two adjacent bus bars 8 in the second direction Y is enhanced.

[0162] Exemplarily, the bus bar 8 includes a top surface 81 and a bottom surface 82 oppositely disposed in the third direction Z, and side surfaces 83 connected between the top surface 81 and the bottom surface 82. The side surfaces 83 include two first side surfaces 83 oppositely disposed in the first direction X and two second side surfaces 83 oppositely disposed in the second direction Y.

[0163] Optionally, the insulating layer 93 is disposed on the second side surface 83 facing other bus bars 8 to improve the insulation performance between adjacent bus bars 8, or the insulating layer 93 is disposed on the first side surface 83 and the second side surface 83 to enhance the insulation performance between adjacent bus bars 8.

[0164] Optionally, two battery cell groups 7 are disposed in the housing 202 along the second direction Y, and the insulating layer 93 is disposed on the two second side surfaces 83 of the bus bar 8, so that two adjacent bus bars 8 in the second direction Y are insulated from each other.

[0165] Optionally, the insulating layer 93 is made of a high-temperature resistant insulating material to reduce the risk of damage to the insulating layer 93 during the welding process of the bus bar 8 and the electrode terminal 61. Exemplarily, the material of the insulating layer 93 can be polyether ether ketone, polytetrafluoroethylene, polyphenylene sulfide, modified polyoxymethylene, etc.

[0166] Please refer to Figure 16 , Figure 16 which is a partial structural schematic diagram of a battery cell of a battery device provided by another embodiment of the present application.

[0167] In some embodiments, as shown in Figure 5 and Figure 16 , the electrode terminal 61 includes an end face 613 in its third direction Z. The end face 613 includes a connection area 614. The bus bar 8 is connected to the connection area 614. The two connection areas 614 of the two electrode terminals 61 provided on the battery cell 3 are arranged away from each other in the second direction Y. The first direction X, the second direction Y, and the third direction Z intersect pairwise.

[0168] In these embodiments, the bus bar 8 is connected to the connection area 614 of the electrode terminal 61. The two connection areas 614 of the two electrode terminals 61 provided on the same battery cell 3 are arranged away from each other in the second direction Y to increase the distance between the two bus bars 8 respectively connected to the two electrode terminals 61, so as to improve the insulation performance between two adjacent bus bars 8.

[0169] Optionally, the dimension of the connection area 614 in the second direction Y is L 5 , and the dimension of the end face 613 in the second direction Y is L 6 , satisfying L 5 ≥0.3*L 6 so that the bus bar 8 and the electrode terminal 61 have sufficient connection area, and the bus bar 8 can be stably connected to the electrode terminal 61, improving the stability of the battery device 2. Exemplarily, the dimension of the connection area 614 in the second direction Y is 0.3*L 6 , or 0.5*L 6 , or 1.0*L 6 , etc.

[0170] Exemplarily, the dimension of the connection area 614 in the second direction Y is 0.3*L 6 , and the two connection areas 614 are arranged at the two ends of the two electrode terminals 61 that are away from each other in the second direction Y.

[0171] Please refer to Figure 17 , Figure 17 which is Figure 5 a cross-sectional view taken along A-A in

[0172] In some embodiments, as shown in Figure 5 andFigure 17 As shown, the box body 202 includes a box main body 94 and a cover plate 95. The box main body 94 includes a chamber that is open at one end in the third direction Z. The cover plate 95 covers the opening. The battery cell group 7 and the bus bar 8 are accommodated in the chamber. The cover plate 95 includes a protruding portion 951 and a connecting portion 952 that are connected to each other. A groove 96 is formed on one side of the protruding portion 951 facing the chamber. The bus bar 8 and at least part of the electrode terminal 61 are accommodated in the groove 96. The distance L from the surface of the connecting portion 952 facing away from the chamber to the battery cell 3 3 , and the distance L from the surface of the protruding portion 951 facing away from the chamber to the battery cell 3 4 , satisfy L 3 < L 4 . The connecting portion 952 covers part of the battery cells 3. The first direction X, the second direction Y, and the third direction Z intersect pairwise.

[0173] In these embodiments, the cover plate 95 includes a protruding portion 951 and a connecting portion 952 that are connected to each other. A groove 96 is formed on one side of the protruding portion 951 facing the chamber. The bus bar 8 and at least part of the electrode terminal 61 are accommodated in the groove 96 to reduce the risk of damage to the battery cells 3 caused by mutual extrusion between the cover plate 95 and the electrode terminals 61. The connecting portion 952 covers part of the battery cells 3, and the distance from the surface of the connecting portion 952 facing away from the chamber to the battery cell 3 is less than the distance from the surface of the protruding portion 951 facing away from the box chamber to the battery cell 3, so as to better fit the top cover and the battery cell 3, reduce the volume of the battery device 2 without damaging the battery cells 3, and improve the energy density of the battery device 2.

[0174] Optionally, the box body 202 includes a box main body 94 and a cover plate 95. The box main body 94 can be one of the first box body 2021 part and the second box body 2022 part in the above embodiments, and the cover plate 95 can be the other of the first box body 2021 part and the second box body 2022 part in the above embodiments.

[0175] Optionally, the cover plate 95 includes a protruding portion 951 and a connecting portion 952 that are connected to each other. The connecting portion 952 and the protruding portion 951 are arranged side by side along the length direction or the width direction of the box body 202. The connecting portion 952 and the protruding portion 951 are jointly connected to the box main body 94, or the connecting portion 952 surrounds the protruding portion 951 and is connected to the box main body 94.

[0176] On one side surface of the protruding portion 951 facing the chamber, a groove 96 is formed. The electrode terminal 61, the bus bar 8, etc. are accommodated in the groove 96. The electrode terminal 61, the bus bar 8, etc. are arranged at intervals along the first direction X and the inner wall of the groove 96 to reduce the risk of the top cover squeezing the electrode terminal 61 and the bus bar 8. Exemplarily, the orthographic projections of the electrode terminal 61 and the bus bar 8 on the cover plate 95 are both located within the groove 96, so that the electrode terminal 61 and the bus bar 8 can be accommodated in the groove 96.

[0177] Optionally, the shape and size of the protruding portion 951, as well as the shape and size of the groove 96, can be flexibly designed. Exemplarily, the protruding portion 951 is in the shape of a cube, and the groove 96 is a rectangular groove.

[0178] The distance L from the side surface of the connecting portion 952 facing away from the chamber to the battery cell 3 3 , the distance L from the side surface of the protruding portion 951 facing away from the chamber to the battery cell 3 4 , satisfying L 3 <L 4 , that is, the dimension of the battery device 2 in the first direction X at the connecting portion 952 is smaller than the dimension of the battery device 2 in the first direction X at the protruding portion 951. By increasing the area occupied by the connecting portion 952 on the cover plate 95, it helps to improve the space utilization rate of the battery device 2 in the first direction X.

[0179] The connecting portion 952 covers a part of the battery cell 3, then the connecting portion 952 contacts the battery cell 3 along the first direction X, or the connecting portion 952 and the battery cell 3 are arranged at intervals, and the orthographic projection of the connecting portion 952 in the first direction X coincides with a part of the battery cell 3.

[0180] Optionally, the protruding portion 951 and the connecting portion 952 are integrally formed, and the material thickness of the protruding portion 951 and the connecting portion 952 is the same.

[0181] Optionally, the side surface of the connecting portion 952 facing the chamber abuts against the battery cell 3, so that the cover plate 95 can be used to fix the battery cell 3.

[0182] Optionally, the cover plate 95 includes a protruding portion 951 and a connecting portion 952 that are connected to each other. The protruding portion 951 and the connecting portion 952 are integrally formed. The protruding portion 951 and the connecting portion 952 are obtained by processing a single base material through processes such as casting, forging, or machining, reducing the splicing seams on the cover plate 95 and improving the structural strength of the cover plate 95; or the protruding portion 951 and the connecting portion 952 are prepared separately and welded together to facilitate adjusting the dimensions of the protruding portion 951 and the connecting portion 952.

[0183] Optionally, two battery cell groups 7 are arranged along the second direction Y in the box body 202, and the electrode terminals 61 of the two battery cell groups 7 are both accommodated in the same protruding portion 951.

[0184] Optionally, two battery cell groups 7 are arranged along the second direction Y inside the box body 202, and the electrode terminals 61 are arranged at one end of the battery cell 3 away from the edge of the box body 94, so that the connecting portion 952 is closer to the edge of the box body 94 than the protruding portion 951, thereby improving the structural strength of the battery device 2.

[0185] In a second aspect, an electric device provided by an embodiment of the present application includes the battery device according to any one of the embodiments in the first aspect.

[0186] In some embodiments, as Figures 1 to 17 shown, the battery device 2 includes a box body 202, a battery cell group 7, and a bus bar 8. The battery cell group 7 is arranged inside the box body 202. The battery cell group 7 includes at least two battery cells 3 arranged along the first direction X. Each battery cell 3 includes two electrode terminals 61 spaced apart along the second direction Y. The two electrode terminals 61 are arranged at the same end of the battery cell group 7 in its second direction Y. The two electrode terminals 61 are a positive electrode terminal 611 and a negative electrode terminal 612 respectively. The positive electrode terminals 611 and the negative electrode terminals 612 of two adjacent battery cells 3 in the first direction X are arranged in opposite ways in the second direction Y. The bus bar 8 extends along the first direction X. Two ends of the bus bar 8 are respectively connected to the positive electrode terminal 611 and the negative electrode terminal 612 of two adjacent battery cells 3 to connect the adjacent battery cells 3 in series. The battery cell 3 further includes a housing 4 and a first insulating member 91. The two electrode terminals 61 extend out of the housing 4 along the third direction Z. The first insulating member 91 is connected to the housing 4 and is arranged between the two electrode terminals 61. At least one electrode terminal 61 is located on the first insulating member 91 in the positive projection in the second direction Y. At least a part of the positive projection of the bus bar 8 in the second direction Y is located on the insulating member. The bus bar 8 further includes an insulating layer 93. The insulating layer 93 is arranged on at least a part of the surface of the bus bar 8 facing other electrode terminals 61 in its second direction Y. The electrode terminal 61 includes an end face 613 in its third direction Z. The end face 613 includes a connection area 614. The bus bar 8 is connected to the connection area 614. The two connection areas 614 of the two electrode terminals 61 arranged on the battery cell 3 are arranged away from each other in the second direction Y. The distance L between the two electrode terminals 61 in the second direction Y 1 , the size L of the battery cell 3 in the second direction Y 2 , satisfy 0 < L 1 ≤ L 2 / 2. The housing 202 includes a housing body 94 and a cover plate 95. The housing body 94 includes a chamber that is open at one end in the third direction Z. The cover plate 95 covers the opening. The battery cell group 7 and the bus bar 8 are accommodated in the chamber. The cover plate 95 includes a protruding portion 951 and a connecting portion 952 that are connected to each other. A groove 96 is formed on one side of the protruding portion 951 facing the chamber. The bus bar 8 and at least part of the electrode terminals 61 are accommodated in the groove 96. The distance L from the surface of the connecting portion 952 facing away from the chamber to the battery cell 3 3 , and the distance L from the surface of the protruding portion 951 facing away from the chamber to the battery cell 3 4 , satisfy L 3 <L 4 . The connecting portion 952 covers part of the battery cells 3.

[0187] In these embodiments, the battery device 2 includes a housing 202, a battery cell group 7, and a bus bar 8. The battery cell group 7 is accommodated in the housing 202. The battery cell group 7 includes at least two battery cells 3 arranged along the first direction X. Each battery cell 3 includes two electrode terminals 61 spaced apart along the second direction Y. The bus bar 8 is connected to one electrode terminal 61 of two adjacent battery cells 3 in the first direction X to connect the adjacent battery cells 3 in series or in parallel. The bus bar 8 extends along the first direction X to reduce the processing difficulty of the bus bar 8 and the matching difficulty between the bus bar 8 and the battery cells 3. By arranging the electrode terminals 61 at the same end of the battery cell group 7 in the second direction Y, the distance between the two electrode terminals 61 of the battery cell 3 in the second direction Y is reduced, so that a larger area of space is formed on both sides of the two electrode terminals 61 to facilitate the arrangement of other components of the battery device 2, improving the compactness of the battery device 2, helping to enhance the utilization rate of the internal space of the housing 202, and improving the energy density of the battery device 2.

[0188] 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: include: Box; A battery cell group is disposed in the box, the battery cell group includes at least two battery cells arranged along a first direction, each of the battery cells includes two electrode terminals spaced apart along a second direction, and the two electrode terminals are disposed at the same end of the battery cell group in the second direction; A busbar extends along the first direction, and both ends of the busbar are respectively connected to one electrode terminal of two adjacent battery cells in the first direction to connect the adjacent battery cells in series or in parallel, and the first direction and the second direction intersect each other. The distance L1 between the two electrode terminals in the second direction and the size L2 of the battery cell in the second direction satisfy 0<L1≤L2 / 2.

2. The battery device according to claim 1, characterized in that: The two electrode terminals are respectively a positive terminal and a negative terminal. The positive terminals and negative terminals of two adjacent battery cells in the first direction are arranged oppositely in the second direction. The two ends of the busbar are respectively connected to the positive terminal and the negative terminal of two adjacent battery cells to connect the adjacent battery cells in series.

3. The battery device according to claim 1, characterized in that: The two electrode terminals are respectively a positive terminal and a negative terminal. The positive terminals and negative terminals of two adjacent battery cells in the first direction are arranged in the same manner in the second direction. The two ends of the busbar are respectively connected to the positive terminals or the negative terminals of two adjacent battery cells to connect the adjacent battery cells in parallel.

4. The battery device according to any one of claims 1 to 3, characterized in that: The battery cell further includes a shell and a first insulating member, the two electrode terminals extend from the shell along a third direction, the first insulating member is connected to the shell and disposed between the two electrode terminals, and the first direction, the second direction and the third direction intersect each other.

5. The battery device according to claim 4, characterized in that: An orthographic projection of at least one of the electrode terminals in the second direction is located on the first insulating member.

6. The battery device according to claim 4, characterized in that: The first insulating member extends along the third direction, and at least a portion of the orthographic projection of the busbar in the second direction is located on the first insulating member.

7. The battery device according to claim 1, characterized in that: The two battery cell groups are spaced apart along the second direction, and the electrode terminal is disposed at one end of the battery cell close to the other battery cell group in the second direction. The two electrode terminals of the battery cell are respectively a first terminal and a second terminal, the first terminal is located between the second terminal and another battery cell group, the battery cell of at least one of the battery cell groups also includes a shell and a second insulating member, the two electrode terminals extend out of the shell along a third direction, the second insulating member is connected to the shell and is arranged on a side of the first terminal away from the second terminal in the second direction, and the first direction, the second direction and the third direction intersect each other.

8. The battery device according to claim 7, characterized in that: At least a portion of the orthographic projections of the current busbars of two adjacent battery cell groups in the second direction are located on the second insulating member.

9. The battery device according to claim 1, characterized in that: The busbar further includes an insulating layer, which is disposed on at least a portion of a surface of the busbar in the second direction facing the other electrode terminals.

10. The battery device according to claim 1, characterized in that: The electrode terminal includes an end face in a third direction thereof, the end face includes a connection area, the busbar is connected to the connection area, the two connection areas of the two electrode terminals arranged on the battery cell are arranged away from each other in the second direction, and the first direction, the second direction and the third direction intersect each other.

11. The battery device according to claim 1, characterized in that: The box body includes a box body and a cover plate, the box body includes a cavity opened at one end in a third direction, the cover plate covers the opening, the battery cell group and the busbar are accommodated in the cavity, the cover plate includes a protrusion and a connection portion connected to each other, the protrusion is formed with a groove on the side facing the cavity, the busbar and at least part of the electrode terminals are accommodated in the groove, the connection portion has a distance L3 from a side surface away from the cavity to the battery cell, and a distance L4 from a side surface away from the cavity to the battery cell, satisfying L3<L4, the connection portion covers part of the battery cell, and the first direction, the second direction and the third direction intersect each other.

12. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 11.

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