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, the two electrode terminals are arranged at the same end of the battery monomer group in the second direction, the distance L1 of the two electrode terminals in the second direction and the size L2 of the battery monomers in the second direction meet the condition that L1 is larger than 0 and smaller than or equal to L2 / 2, the two electrode terminals are respectively a first terminal and a second terminal; the confluence piece extends in the first direction and is obliquely arranged in the second direction, the two ends of the confluence piece are connected to the first terminals and the second terminals of the two adjacent battery monomers respectively, and the first terminals and the second terminals of the adjacent battery monomers are connected through the obliquely arranged confluence piece; therefore, the arrangement modes of the first terminals and the second terminals of the adjacent battery monomers in the second direction are the same, so that the mold opening preparation cost of the battery monomers is reduced, and the processing cost of the battery device is saved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular 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 cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the related art, a plurality of battery cells are placed in a box in parallel or in series to form a battery device. How to reduce the processing cost of the battery cells to save the overall cost of the battery device is an urgent problem to be solved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can reduce the processing cost of battery cells to save the overall cost of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box; a battery cell group, which is arranged in the box, the battery cell group comprising at least two battery cells arranged along a first direction, each battery cell comprising two electrode terminals spaced apart along a second direction, the two electrode terminals being arranged at the same end of the battery cell group in the second direction, the two electrode terminals being respectively a first terminal and a second terminal, and the first terminals and the second terminals of two adjacent battery cells being arranged in the same manner in the second direction; a busbar, the busbar extending along the first direction and being obliquely arranged in the second direction, the two ends of the busbar being respectively connected to the first terminals and the second terminals of two adjacent battery cells to connect the adjacent battery cells in series, the first direction and the second direction intersecting, wherein the spacing L between the two electrode terminals in the second direction 1 , the size L of the battery cell in the second direction 2 , satisfying 0<L 1 ≤L 2 / 2.

[0006] In the scheme of the embodiment of the present application, the battery device includes a box, a battery cell group and a busbar. The battery cell group is accommodated in the box. The battery cell group includes at least two battery cells arranged along a first direction. Each battery cell includes two electrode terminals spaced apart along a second direction. The two electrode terminals of each battery cell are located at the same end of the battery cell group in the second direction. The busbar extends along the first direction and is tilted in the second direction. The busbar can connect the first terminal and the second terminal of adjacent battery cells to connect the adjacent battery cells in series. The first terminal and the second terminal of adjacent battery cells are connected by the tilted busbar so that the first terminal and the second terminal of adjacent battery cells are arranged in the same manner in the second direction, so as to reduce the processing cost of the battery cell, simplify the processing process of the battery cell group, and save the overall preparation cost of the battery device. The spacing L between the two electrode terminals in the second direction 1 , the size 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 space is formed on both sides of the two electrode terminals to facilitate the arrangement of other components of the battery device, thereby improving the compactness of the battery device, enhancing the utilization rate of the internal space of the box, and improving the energy density of the battery device.

[0007] In some embodiments, the battery cell further includes a shell and a first insulating member connected to each other, two electrode terminals extend from the shell along a third direction, the first insulating member is disposed between the two electrode terminals, and the first direction, the second direction and the third direction intersect each other.

[0008] In the solution of the embodiment of the present application, the two electrode terminals extend out of the outer shell along the third direction to be connected to the bus bar, and the first insulating member is connected to the outer shell to improve the stability of the insulating member. The insulating member is arranged between the two electrode terminals to enhance the insulation performance between two adjacent electrode terminals and improve the reliability of the battery device.

[0009] In some embodiments, an orthographic projection of at least one electrode terminal in the second direction is located within the first insulating member.

[0010] 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, enhance the insulation performance between two adjacent electrode terminals, and improve the reliability of the battery device.

[0011] 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 first insulating member.

[0012] In the solution 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 separate two adjacent busbars in the second direction, enhance the insulation performance of the two adjacent busbars, and improve the reliability of the battery device.

[0013] In some embodiments, the busbar includes an extension portion and two busbars, the two busbars are respectively connected to the first terminal and the second terminal of adjacent battery cells, the extension portion extends in the first direction and is inclined along the second direction to connect the two busbars, the first insulating member includes a first part, the first part is located between the busbars of two adjacent busbars, and / or the first insulating member includes a second part, the second part is located between the busbars and the extension portion of two adjacent busbars.

[0014] In some embodiments, the first portion of the first insulating member is located between the bus portions of two adjacent bus portions, and the first insulating member is used to enhance the insulation performance between the two adjacent bus portions in the second direction, and / or the second portion of the first insulating member is located between the bus portions and the extension portions of two adjacent bus portions, and the first insulating member is used to enhance the insulation performance between the bus portions and the extension portions of two adjacent bus portions in the first direction, thereby improving the reliability of the battery device.

[0015] In some embodiments, the electrode terminal includes an end face in its third direction, the end face includes a connection area, the busbar and the connection area are connected, and the two connection areas of two electrode terminals arranged on the same 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.

[0016] In the scheme of the embodiment of the present application, the busbar is connected to the connection area of ​​the electrode terminal, and the two connection areas of the two electrode terminals of the same battery cell are arranged away from each other in the second direction to increase the distance between the two busbars respectively connected to the two electrode terminals, so as to improve the insulation performance between the two adjacent busbars.

[0017] In some embodiments, the busbar further includes an insulating layer, which is disposed on at least a portion of the surface of the busbar in the second direction facing the other electrode terminals.

[0018] In the solution of the embodiment of the present application, the insulation reliability between two adjacent busbars in the second direction is enhanced by at least partially directing the surface of the busbar toward other electrode terminals along the second direction.

[0019] In some embodiments, two battery cell groups are spaced apart along a second direction, the electrode terminal is arranged at one end of the battery cell group close to the other battery cell group in the second direction, the first terminal is located between the second terminal and the other battery cell group, and the battery cells of at least one battery cell group also include an outer shell and a second insulating member connected to each other, the two electrode terminals extend out of the outer shell along a third direction, the second insulating member 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.

[0020] 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 terminals are arranged at one end of the battery cell group close to the other battery cell group in the second direction. The battery cells of at least one battery cell group also include an outer shell and a second insulating member that are connected to each other. The two electrode terminals extend out of the outer shell along the third direction, and the second insulating member is arranged on the side of the first terminal that is away from the second terminal in the second direction, so as to enhance the insulation performance between the battery terminals of adjacent battery cell groups and improve the reliability of the battery device.

[0021] 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.

[0022] In the solution of the embodiment of the present application, at least part of the orthographic projection of the busbars of two adjacent battery cell groups in the second direction is located on the second insulating member to enhance the insulation performance between the busbars of adjacent battery cell groups and improve the reliability of the battery device.

[0023] In some embodiments, 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 connecting portion connected to each other, a groove is formed on the side of the protrusion facing the cavity, the busbar and at least part of the electrode terminal are accommodated in the groove, and the first direction, the second direction and the third direction intersect each other.

[0024] In the solution of the embodiment of the present application, the cover plate includes a protrusion and a connecting portion that are connected to each other, and a groove is formed on the side of the protrusion facing the cavity. The busbar and at least part of the electrode terminal are accommodated in the groove to reduce the risk of damage to the battery cell due to mutual compression between the cover plate and the electrode terminal.

[0025] In some embodiments, the distance L between the surface of the connecting portion facing away from the cavity and the battery cell is 3 , the distance L between the side surface of the protrusion away from the cavity and the battery cell 4 , satisfying L 3 <L 4 , the connecting portion covers a portion of the battery cell.

[0026] In the scheme of the embodiment of the present application, the connecting portion covers part of the battery cell, and the distance from the side surface of the connecting portion facing away from the cavity to the battery cell is smaller than the distance from the side surface of the protruding portion facing away from the box cavity to the battery cell, so that the top cover and the battery cell can be better adapted, the volume of the battery device can be reduced without damaging the battery cell, and the energy density of the battery device can be improved.

[0027] In some embodiments, the box body further includes an adhesive layer, which is disposed between the battery cell and the connecting portion, and the connecting portion is adhesively connected to the battery cell via the adhesive layer.

[0028] In the solution of the embodiment of the present application, the box body also includes an adhesive layer arranged between the battery cell and the connecting part. The connecting part is adhesively connected to the battery cell through the adhesive layer, so that the cover plate and the battery cell are fixed to each other, so as to improve the structural strength of the battery device. In addition, the setting method of the adhesive layer is easy, which can reduce the processing difficulty of the battery device.

[0029] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the application;

[0034] Figure 4 is an exploded view of a battery cell provided in one embodiment of the present application;

[0035] Figure 5 is an exploded view of a battery device provided in one embodiment of the present application;

[0036] Figure 6 is a schematic structural diagram of a battery cell group of a battery device provided in one embodiment of the present application;

[0037] Figure 7 is a top view of a battery cell of a battery device provided in one embodiment of the present application;

[0038] Figure 8 is a schematic structural diagram of a battery cell of a battery device provided in one embodiment of the present application;

[0039] Fig. 9 is a partial structural schematic diagram of a battery device provided in one embodiment of the present application;

[0040] Fig.10 is a schematic structural diagram of a battery cell of a battery device provided in one embodiment of the present application;

[0041] Fig.11 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application;

[0042] Fig.12 is a schematic structural diagram of a busbar of a battery device provided in one embodiment of the present application;

[0043] Fig.13 is a schematic structural diagram of a battery device provided in another embodiment of the present application;

[0044] Fig.14 is a schematic structural diagram of a battery device provided in another embodiment of the present application;

[0045] Fig.15 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application;

[0046] Fig.16 yes Figure 5 Cross-sectional view at AA in the middle.

[0047] Reference numerals:

[0048] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0049] 3. Battery cells;

[0050] 4. Shell;

[0051] 5. electrode assembly; 51. pole ear; 52. electrode body;

[0052] 6. End cap assembly; 61. Electrode terminal; 613. End face; 614. Connection area; 62. First terminal; 63. Second terminal; 64. Top cover plate;

[0053] 7. Battery cell group; 71. Casing;

[0054] 8. busbar; 81. top surface; 82. bottom surface; 83. side surface; 84. extension portion; 85. busbar;

[0055] 91, first insulating member; 911, first part; 912, second part; 92, second insulating member; 93, insulating layer; 94, box body; 95, cover plate; 951, protrusion; 952, connecting part; 96, groove; 97, adhesive layer;

[0056] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0057] 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.

[0058] 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 common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0059] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0060] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number 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.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0064] A plurality of battery cells are placed in a box in parallel or in series to form a battery device. How to reduce the overall manufacturing cost of the battery device by reducing the processing cost of the battery cells is an urgent problem to be solved.

[0065] The reason for the above problem is that in the related technology, adjacent battery cells are connected in series through a bar sheet, which is usually a rectangular conductive sheet. When the two electrode terminals of the battery cell are arranged at one end of the battery cell, in order to enable the adjacent battery cells to be connected in series through the rectangular conductive sheet, the positive and negative terminals of the adjacent battery cells are arranged in opposite ways, that is, the structures of adjacent battery cell groups are different, which increases the processing costs of the battery cells and battery cell groups.

[0066] Based on the above problems, an embodiment of the present application provides a battery device, which includes a case, a battery cell group and a busbar. The battery cell group is accommodated in the case. The battery cell group includes at least two battery cells arranged along a first direction, each battery cell includes two electrode terminals spaced apart along a second direction, the two electrode terminals of each battery cell are located at the same end of the battery cell group in its second direction, the busbar extends along the first direction and is inclined in the second direction, the busbar can connect the first and second terminals of adjacent battery cells to connect the adjacent battery cells in series, and the first and second terminals of adjacent battery cells are connected by the inclined busbar so that the first and second terminals of adjacent battery cells are arranged in the same manner in the second direction, so as to reduce the processing cost of the battery cells, simplify the processing process of the battery cell group, and save the overall preparation cost of the battery device.

[0067] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0068] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0069] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0070] 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 storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0071] 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 may include a battery module or a battery pack. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0072] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector and a positive electrode ear connected to the positive current collector. The positive current collector is coated with a positive active material layer, and the positive electrode ear is not coated with a 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. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet 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 collector and a negative electrode tab connected to the negative current collector, the negative current collector 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, polypropylene) or PE (polyethylene, polyethylene), etc.

[0073] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0074] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0075] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0076] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0077] The battery device 2 mentioned in the embodiment 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, in parallel or in mixed connection through an extension component.

[0078] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0079] 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 by a cable tie.

[0080] In some embodiments, the battery device may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 202 .

[0081] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box by fixing the battery module 201 in the box.

[0082] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0083] As an example, the box 202 may include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled together to form a closed space inside the box 202 to accommodate the battery monomer assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0084] 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.

[0085] In some embodiments, the box 202 can be used as a part of the chassis structure of the vehicle. For example, a part of the box 202 can become at least a part of the floor of the vehicle, or a part of the box 202 can become at least a part of the cross beam and the longitudinal beam of the vehicle.

[0086] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0087] In some embodiments, Figure 2 and Figure 3As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the box 202.

[0088] The multiple battery cells 3 in the battery module 201 can be electrically connected via an extension component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0089] Figure 4 FIG. 1 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 constituting a battery device. Figure 4 The battery cell 3 includes an end cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0090] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be included in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking pole sheets, which are divided into positive pole sheets and negative pole sheets, and a separator is usually provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the electrode body 52, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute a pole ear 51. The positive pole ear and the negative pole ear may be located together at one end of the electrode body 52 or respectively at both ends of the electrode body 52. ​​During the charge and discharge process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the pole ear 51 connects the electrode terminal 61 to form a current loop.

[0091] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0092] 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.

[0093] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive and negative electrodes may be provided, and the plurality of positive and negative electrodes may be alternately stacked, and a plurality of separators may be provided, and each separator may be provided between any adjacent positive or negative electrodes, or the separator may be provided continuously and folded between any adjacent positive or negative electrodes.

[0094] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0095] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] The battery cell 3 may include a shell 4. The shell 4 is a component used to cooperate with the end cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure) and other components. The shell 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 shell) or an aluminum-plastic film, etc. In some embodiments, the shell 4 can be a sealed structure or a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 plays a role in protecting the electrode assembly 5, and a sealing bag is also included between the shell 4 and the electrode assembly 5, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0097] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack 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 polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0098] The housing 4 and the end cap assembly 6 may be independent components, and one or more openings may 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 may be integrated. Optionally, the end cap assembly 6 and the housing 4 may form a common connection surface before other components are placed in the housing, and when the interior of the housing 4 needs to be encapsulated, the end cap assembly 6 covers the housing 4.

[0099] In some embodiments, the electrode terminal 61 may be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal 61 is electrically connected to the tab 51. The electrode terminal 61 may be directly connected to the tab 51 or indirectly connected to the tab 51 through a switching mechanism.

[0100] See also Figure 5 and Figure 6 , Figure 5 is an exploded view of a battery device provided in one embodiment of the present application; Figure 6 Schematic diagram of the structure of a battery cell group of a battery device provided in one embodiment of the present application.

[0101] First, as Figure 5 and Figure 6As shown, the present application provides a battery device 2, which includes a box body 202, a battery cell group 7 and a busbar 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 arranged at intervals 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 two electrode terminals 61 are respectively a first terminal 62 and a second terminal 63. The first terminals 62 and the second terminals 63 of two adjacent battery cells 3 are arranged in the same manner in the second direction Y. The busbar 8 extends along the first direction X and is obliquely arranged in the second direction Y. The two ends of the busbar 8 are respectively connected to the first terminals 62 and the second terminals 63 of two adjacent battery cells 3 to connect the adjacent battery cells 3 in series. The first direction X and the second direction Y intersect.

[0102] In the scheme of the embodiment of the present application, the battery device 2 includes a box body 202, a battery cell group 7 and a busbar 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 arranged at intervals along a second direction Y. The two electrode terminals 61 of each battery cell 3 are located at the same end of the battery cell group 7 in the second direction Y. The busbar 8 extends along the first direction X and is inclined in the second direction Y. The busbar 8 can connect the first terminals 62 and the second terminals 63 of adjacent battery cells 3 to connect the adjacent battery cells 3 in series. The first terminals 62 and the second terminals 63 of adjacent battery cells 3 are connected by the inclined busbar 8, so that the first terminals 62 and the second terminals 63 of adjacent battery cells 3 are arranged in the same manner in the second direction Y, so as to reduce the processing cost of the battery cells 3, simplify the processing process of the battery cell group 7, and save the overall preparation cost of the battery device 2.

[0103] The battery cell group 7 includes at least two battery cells 3 arranged along the first direction X, and the battery cells 3 are electrically connected to each other. Exemplarily, the battery cell group 7 includes 2, 3, 5 or 10 battery cells 3 .

[0104] The box 202 can accommodate one battery cell group 7, or at least two battery cell groups 7 are arranged in the box 202 along the second direction Y, and the number of battery cells 3 in each battery cell group 7 is the same or different. Exemplarily, 2, 3, 5 or 10 battery cell groups 7 are arranged in the box 202.

[0105] Each battery cell 3 includes two electrode terminals 61 spaced apart along the second direction Y, the two electrode terminals 61 are respectively a first terminal 62 and a second terminal 63, the first terminal 62 is one of the positive terminal or the negative terminal, the second terminal 63 is the other of the positive terminal or the negative terminal, the positive terminal is connected to the positive electrode sheet of the electrode assembly 5, and the negative terminal is connected to the negative electrode sheet of the electrode assembly 5.

[0106] Exemplarily, the first terminal 62 is a positive terminal, and the second terminal 63 is a negative terminal; or the first terminal 62 is a negative terminal, and the second terminal 63 is a positive terminal.

[0107] The first terminals 62 and the second terminals 63 of two adjacent battery cells 3 are arranged in the same manner in the second direction Y. Then, in the same battery cell group 7, the first terminal 62 of each battery cell 3 is closer to the center line of the battery cell 3 in the second direction Y than the second terminal 63, or the second terminal 63 of each battery cell 3 is closer to the center line of the battery cell 3 in the second direction Y than the first terminal 62. Exemplarily, the two first terminals 62 of adjacent battery cells 3 are arranged opposite each other in the first direction X, or the two second terminals 63 of adjacent battery cells 3 are arranged opposite each other in the first direction X.

[0108] The busbar 8 and the electrode terminal 61 are connected and conductive to each other. The busbar 8 may be a bar. Exemplarily, the busbar 8 may be a copper bar or an aluminum bar, etc. Exemplarily, the busbar 8 and the electrode terminal 61 are connected by welding or clamping.

[0109] The busbar 8 is connected to the electrode terminals 61 of two adjacent battery cells 3. The busbar 8 includes a first end and a second end arranged opposite to each other in a first direction X. The first end is connected to the first terminal 62 of one battery cell 3, and the second end extends in the first direction X and is inclined toward the second terminal 63 of the other battery cell 3 in the second direction Y, so that the busbar 8 connects the first terminal 62 and the second terminal 63 of the adjacent battery cells 3.

[0110] Optionally, the battery cell group 7 includes at least three battery cells 3 arranged at intervals in the first direction X, and at least two current collectors 8 are arranged at intervals along the first direction X.

[0111] See also Figure 7 , Figure 7 FIG. 1 is a top view of a battery cell of a battery device provided in an embodiment of the present application.

[0112] In some embodiments, Figures 5 to 7 As shown, the distance L between the two electrode terminals 61 in the second direction Y is 1 The dimension L of the battery cell 3 in the second direction Y is 2 , satisfying 0<L 1 ≤L2 / 2.

[0113] In these embodiments, the distance L between the two electrode terminals 61 in the second direction Y is 1 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 space is formed on both sides of the two electrode terminals 61 to facilitate the arrangement of other components of the battery device 2, thereby improving the compactness of the battery device 2, enhancing the utilization rate of the internal space of the box body 202, and improving the energy density of the battery device 2.

[0114] The two electrode terminals 61 are both arranged at the same end of the battery cell group 7 in the second direction Y, and the battery cell 3 includes two half-regions arranged opposite to each other in the second direction Y, and the two half-regions are respectively the first half-region and the second half-region. In the same battery cell group 7, the two electrode terminals 61 of the battery cell 3 are both located in the first half-region, or the two electrode terminals 61 are both located in the second half-region.

[0115] Optionally, the distance L between the two electrode terminals 61 in the second direction Y is 1 , meet 15mm≤L 1 ≤150 mm, illustratively, the distance L between the two electrode terminals 61 in the second direction Y is 1 It is 15mm or 30mm or 65mm or 150mm, etc.

[0116] See also Figure 8 , Figure 8 It is a schematic diagram of the structure of a battery cell of a battery device provided in one embodiment of the present application.

[0117] In some embodiments, Figure 6 and Figure 8 As shown, the battery cell 3 further includes a shell 71 and a first insulating member 91 connected to each other, two electrode terminals 61 extend from the shell 71 along a third direction Z, the first insulating member 91 is disposed between the two electrode terminals 61, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0118] In these embodiments, the two electrode terminals 61 extend out of the outer shell 71 along the third direction Z to be connected to the bus bar 8, and the first insulating member 91 is connected to the outer shell 71 to improve the stability of the insulating member. The insulating member is arranged between the two electrode terminals 61 to enhance the insulation performance between two adjacent electrode terminals 61, thereby improving the reliability of the battery device 2.

[0119] For example, Figure 4As shown, the housing 71 includes the shell 4 and the end cover assembly 6 of the above embodiment, the shell 4 includes an opening, the end cover assembly 6 includes an end cover plate 95 and an electrode terminal 61, the end cover plate 95 covers the opening, and the electrode terminal 61 extends out of the end cover plate 95.

[0120] The first insulating member 91 is disposed between the two electrode terminals 61 , and at least a portion of the orthographic projection of the electrode terminal 61 in the second direction Y is located on the first insulating member 91 , so that the insulation reliability between the two electrode terminals 61 is enhanced by the first insulating member 91 .

[0121] Optionally, the first insulating member 91 and the two electrode terminals 61 are arranged on the same surface of the shell 71 in the third direction Z, or the two electrode terminals 61 are arranged on one side of the shell 71 in the third direction Z, one end of the first insulating member 91 is connected to one side of the shell 71 in the first direction X or the second direction Y, and the other end thereof extends between the two electrode terminals 61.

[0122] Optionally, the first insulating member 91 and the housing 71 may be connected by bonding, injection molding, or clamping.

[0123] Optionally, the shape and size of the first insulating member 91 can be designed by oneself. Exemplarily, the first insulating member 91 is rectangular or circular.

[0124] 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.

[0125] Exemplarily, the first insulating member 91 may be a plastic member, a silicone member, a rubber member, or the like.

[0126] In some embodiments, Figure 6 and Figure 8 As shown, the orthographic projection of at least one electrode terminal 61 in the second direction Y is located within the first insulating member 91 .

[0127] In these embodiments, the orthographic projection of the electrode terminal 61 in the second direction Y is located on the first insulating member 91 , so that the insulating member can separate the two electrode terminals 61 , enhance the insulation performance between two adjacent electrode terminals 61 , and improve the reliability of the battery device 2 .

[0128] One of the two electrode terminals 61 has its orthographic projection in the second direction Y located on the first insulating member 91 ; or the orthographic 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 .

[0129] 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.

[0130] See also Fig. 9 and Fig.10 , Fig. 9 is a partial structural schematic diagram of a battery device provided in one embodiment of the present application; Fig.10 It is a schematic diagram of the structure of a battery cell of a battery device provided in one embodiment of the present application.

[0131] In some embodiments, Fig. 9 and Fig.10 As shown, the first insulating member 91 extends along the third direction Z, and at least a portion of the orthographic projection of the busbar 8 in the second direction Y is located on the first insulating member 91 .

[0132] In these embodiments, the first insulating member 91 extends along the third direction Z, and at least a portion of the positive projection of the busbar 8 in the second direction Y is located on the first insulating member 91, so that the first insulating member 91 can separate two adjacent busbars 8 in the second direction Y, thereby enhancing the insulation performance of the two adjacent busbars 8 and improving the reliability of the battery device 2.

[0133] The two busbars 8 are arranged at intervals along the second direction Y and are respectively connected to one of the first terminal 62 and the second terminal 63 of the battery cell 3. One end of the first insulating member 91 is connected to the shell 71, and the other end thereof extends between the two busbars 8 along the third direction Z to enhance the insulation reliability of the two adjacent busbars 8 in the second direction Y.

[0134] Optionally, the first insulating member 91 and at least a portion of the bus bar 8 are arranged opposite to each other in the second direction Y, so that at least a portion of the orthographic projection of the bus bar 8 in the second direction Y is located on the first insulating member 91 .

[0135] Optionally, the size of the first insulating member 91 in the first direction X is the same as the size of the housing 71 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.

[0136] In some embodiments, Fig. 9 and Fig.10As shown, the busbar 8 includes an extension portion 84 and two busbars 85, the two busbars 85 are respectively connected to the first terminal 62 and the second terminal 63 of the adjacent battery cells 3, the extension portion 84 extends in the first direction X and is inclined along the second direction Y to connect the two busbars 85, the first insulating member 91 includes a first portion 911, the first portion 911 is located between the busbars 85 of two adjacent busbars 8, and / or the first insulating member 91 includes a second portion 912, the second portion 912 is located between the busbars 85 and the extension portion 84 of two adjacent busbars 8.

[0137] In these embodiments, the first portion 911 of the first insulating member 91 is located between the bus portions 85 of two adjacent bus portions 8, and the first insulating member 91 is used to enhance the insulation performance between the two adjacent bus portions 85 in the second direction Y, and / or the second portion 912 of the first insulating member 91 is located between the bus portions 85 and the extension portions 84 of two adjacent bus portions 8, and the first insulating member 91 is used to enhance the insulation performance between the bus portions 85 and the extension portions 84 of two adjacent bus portions 8 in the first direction X, thereby improving the reliability of the battery device 2.

[0138] Exemplarily, the busbar 8 includes an extension portion 84 and two busbars 85 , the two busbars 85 are welded together with the first terminal 62 and the second terminal 63 of two adjacent battery cells 3 , and the extension portion 84 extends obliquely and is connected to the two busbars 85 to connect adjacent battery cells 3 in series.

[0139] Optionally, the extension portion 84 and the conduit portion 85 are integrally formed to enhance the structural strength of the conduit member 8 .

[0140] The busbars 85 of two adjacent busbars 8 are spaced apart in the second direction Y, and the first portion 911 is disposed between the two adjacent busbars 85 to reduce the risk of short circuit due to contact between the two adjacent busbars 85 under external force in the second direction Y.

[0141] Among two adjacent busbars 8, the extension portion 84 of one busbar 8 and the busbar portion 85 of the other busbar 8 close to the extension portion 84 are spaced apart in the first direction X, and the second portion 912 is arranged between the extension portion 84 and the busbar portion 85 of the adjacent busbar 8 to reduce the risk of short circuit due to contact between the two adjacent busbar portions 85 under external force in the first direction X.

[0142] Optionally, the second portion 912 extends along the second direction Y to reduce the difficulty of processing the second portion 912 , or the second portion 912 extends along the extension direction of the confluence portion 85 .

[0143] Optionally, in the same battery cell 3, the first part 911 and the second part 912 are spaced apart to facilitate adjustment of the position of the first insulating member 91, or the first part 911 and the second part 912 are interconnected to increase the size of the first insulating member 91 and improve its insulation effect.

[0144] Exemplarily, the two second portions 912 are connected to the two ends of the first portion 911 in the first direction X; or the first portion 911 and the second portion 912 are spaced apart, and the second portion 912 is disposed at a location where the distance between the confluence portion 85 and the extension portion 84 is smaller.

[0145] See also Fig.11 , Fig.11 It is a partial structural schematic diagram of a battery device provided in another embodiment of the present application.

[0146] In some embodiments, Figures 9 to 11 As shown, the electrode terminal 61 includes an end face 613 in its third direction Z, the end face 613 includes a connection area 614, the busbar 8 is connected to the connection area 614, and the two connection areas 614 of the two electrode terminals 61 arranged on the same battery cell 3 are arranged away from each other in the second direction Y, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0147] In these embodiments, the busbar 8 is connected to the connection area 614 of the electrode terminal 61, and the two connection areas 614 of the two electrode terminals 61 of the same battery cell 3 are arranged away from each other in the second direction Y to increase the distance between the two busbars 8 respectively connected to the two electrode terminals 61, so as to improve the insulation performance between the two adjacent busbars 8.

[0148] Optionally, the size of the connection area 614 in the second direction Y is L 5 The dimension of the end surface 613 in the second direction Y is L 6 , satisfying L 5 ≥0.3*L 6 , so that the busbar 8 and the electrode terminal 61 have sufficient connection area, the busbar 8 can be stably connected to the electrode terminal 61, and the stability of the battery device 2 is improved. Exemplarily, the size 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 wait.

[0149] For example, the size of the connection area 614 in the second direction Y is 0.3*L 6 The two connection regions 614 are disposed at two ends of the two electrode terminals 61 that are away from each other in the second direction Y.

[0150] See also Fig.12 , Fig.12 Schematic diagram of the structure of a busbar of a battery device provided in one embodiment of the present application.

[0151] In some embodiments, Figure 5 , Fig.11 and Fig.12 As shown, the busbar 8 further includes an insulating layer 93 , which is disposed on at least a portion of the surface of the busbar 8 in the second direction Y facing the other electrode terminals 61 .

[0152] In these embodiments, by at least partially exposing the surface of the busbar 8 along the second direction Y to other electrode terminals 61 , the insulation reliability between two adjacent busbars 8 in the second direction Y is enhanced.

[0153] Exemplarily, the busbar 8 includes a top surface 81 and a bottom surface 82 arranged opposite to each other in a third direction Z, and a side surface 83 connected between the top surface 81 and the bottom surface 82, and the side surface 83 includes two first side surfaces 83 arranged opposite to each other along the first direction X, and two second side surfaces 83 arranged opposite to each other along the second direction Y.

[0154] Optionally, the insulating layer 93 is disposed on the second side 83 facing other busbars 8 to improve the insulation performance of adjacent busbars 8 , or the insulating layer 93 is disposed on the first side 83 and the second side 83 to enhance the insulation performance of adjacent busbars 8 .

[0155] Optionally, two battery cell groups 7 are arranged in the box body 202 along the second direction Y, and the insulating layer 93 is arranged on the two second side surfaces 83 of the busbar 8 to insulate two adjacent busbars 8 in the second direction Y from each other.

[0156] Optionally, the insulating layer 93 is a high temperature resistant insulating material to reduce the risk of damage to the insulating layer 93 during welding of the busbar 8 and the electrode terminal 61. Exemplarily, the insulating layer 93 may be made of polyetheretherketone, polytetrafluoroethylene, polyphenylene sulfide, modified polyoxymethylene, etc.

[0157] See also Figures 13 to 15 , Fig.13 is a schematic structural diagram of a battery device provided in another embodiment of the present application; Fig.14 is a schematic structural diagram of a battery device provided in another embodiment of the present application; Fig.15 It is a partial structural schematic diagram of a battery device provided in another embodiment of the present application.

[0158] In some embodiments, Figures 13 to 15As shown, two battery cell groups 7 are arranged at intervals along the second direction Y, the electrode terminal 61 is arranged at one end of the battery cell group 7 close to the other battery cell group 7 in the second direction Y, the first terminal 62 is located between the second terminal 63 and the other battery cell group 7, and the battery cells 3 of at least one battery cell group 7 also include an outer shell 71 and a second insulating member 92 that are connected to each other, the two electrode terminals 61 extend out of the outer shell 71 along the third direction Z, the second insulating member 92 is arranged on the side of the first terminal 62 away from the second terminal 63 in the second direction Y, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0159] 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 group 7 close to the other battery cell group 7 in the second direction Y. The battery cells 3 of at least one battery cell group 7 also include an outer shell 71 and a second insulating member 92 that are connected to each other. The two electrode terminals 61 extend out of the outer shell 71 along the third direction Z, and the second insulating member 92 is arranged on the side of the first terminal 62 away from the second terminal 63 in the second direction Y to enhance the insulation performance between the battery terminals of adjacent battery cell groups 7 and improve the reliability of the battery device 2.

[0160] The box body 202 includes two battery cell groups 7 spaced apart 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.

[0161] One of the two battery cell groups 7 in the box 202 is provided with a second insulating member 92 , or both of the two battery cell groups 7 in the box 202 are provided with a second insulating member 92 .

[0162] Optionally, the second insulating member 92 and the housing 71 are connected by bonding, injection molding, or clamping.

[0163] Since the distance between the electrode terminals 61 of the two battery cell groups 7 in the box 202 in the second direction Y is very small, a second insulating member 92 is provided between the first terminals 62 of two adjacent battery cell groups 7 in the embodiment of the present application to improve the insulation reliability of the adjacent first terminals 62 .

[0164] Optionally, a first insulating member 91 and a second insulating member 92 are provided on the battery cells 3 of at least one battery cell group 7 .

[0165] Optionally, the orthographic projections of the first terminals 62 in the second direction Y are all located on the second insulating member 92 .

[0166] In some embodiments, Figures 13 to 15As shown, at least a portion of the orthographic projections of the current busbars 8 of two adjacent battery cell groups 7 in the second direction Y are located on the second insulating member 92 .

[0167] In these embodiments, at least a portion of the orthographic projections of the busbars 8 of two adjacent battery cell groups 7 in the second direction Y are located on the second insulating member 92 to enhance the insulation performance between the busbars 8 of the adjacent battery cell groups 7 and improve the reliability of the battery device 2 .

[0168] The busbars 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 71, and the other end thereof extends along the third direction Z to between two adjacent busbars 8, and the second insulating member 92 and at least part of the busbars 8 are arranged opposite to each other so that at least part of the positive projection of the busbar 8 in the second direction Y is located on the second insulating member 92, so as to enhance the insulation reliability of the two adjacent busbars 8 in the second direction Y.

[0169] Optionally, the size of the second insulating member 92 in the first direction X is the same as the size of the housing 71 in the first direction X, so as to increase the extension size of the second insulating member 92 between two adjacent busbars 8 in the second direction Y and improve the insulation performance of the second insulating member 92 .

[0170] See also Fig.16 , Fig.16 yes Figure 5 Cross-sectional view at AA in the middle.

[0171] In some embodiments, Figure 5 and Fig.16 As shown, the box body 202 includes a box body 94 and a cover plate 95, the box body 94 includes a cavity opened at one end in the third direction Z, the cover plate 95 covers the opening, the battery cell group 7 and the bus 8 are accommodated in the cavity, the cover plate 95 includes a protrusion 951 and a connection portion 952 connected to each other, the protrusion 951 is formed with a groove 96 on the side facing the cavity, the bus 8 and at least part of the electrode terminal 61 are accommodated in the groove 96, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0172] In these embodiments, the cover plate 95 includes a protrusion 951 and a connecting portion 952 that are connected to each other. A groove 96 is formed on the side of the protrusion 951 facing the chamber. The busbar 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 cell 3 due to mutual compression between the cover plate 95 and the electrode terminal 61.

[0173] Optionally, the box body 202 includes a box body 94 and a cover plate 95, the box body 94 may be one of the first box body 2021 and the second box body 2022 in the above embodiment, and the cover plate 95 may be the other of the first box body 2021 and the second box body 2022 in the above embodiment.

[0174] Optionally, the cover 95 includes a protrusion 951 and a connecting portion 952 that are connected to each other, and the connecting portion 952 and the protrusion 951 are arranged side by side along the length direction or the width direction of the box body 202, and the connecting portion 952 and the protrusion 951 are commonly connected to the box body 94, or the connecting portion 952 is arranged around the protrusion 951, and the connecting portion 952 is connected to the box body 94.

[0175] A groove 96 is formed on one side surface of the protrusion 951 facing the chamber, and the electrode terminal 61 and the busbar 8 are accommodated in the groove 96. The electrode terminal 61 and the busbar 8 are spaced apart from each other 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 busbar 8. Exemplarily, the orthographic projections of the electrode terminal 61 and the busbar 8 on the cover plate 95 are both located in the groove 96, so that the electrode terminal 61 and the busbar 8 can be accommodated in the groove 96.

[0176] Optionally, the shape and size of the protrusion 951, as well as the shape and size of the groove 96 can be flexibly designed. Exemplarily, the protrusion 951 is in a cubic shape, and the groove 96 is a rectangular groove.

[0177] In some embodiments, Figure 5 and Fig.16 As shown, the distance L between the surface of the connecting portion 952 facing away from the cavity and the battery cell 3 is 3 , the distance L between the side surface of the protrusion 951 away from the cavity and the battery cell 3 4 , satisfying L 3 <L 4 , the connecting portion 952 covers a portion of the battery cell 3 .

[0178] In these embodiments, the connecting portion 952 covers a portion of the battery cell 3, and the distance from the side surface of the connecting portion 952 facing away from the cavity to the battery cell 3 is smaller than the distance from the side surface of the protrusion 951 facing away from the box cavity to the battery cell 3, so that the top cover and the battery cell 3 can be better adapted, and the volume of the battery device 2 can be reduced without damaging the battery cell 3, thereby improving the energy density of the battery device 2.

[0179] The distance L between the surface of the connecting portion 952 facing away from the cavity and the battery cell 3 is 3 , the distance L between the side surface of the protrusion 951 away from the cavity and 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 connection portion 952 is smaller than the dimension of the battery device 2 in the first direction X at the protrusion 951 . By increasing the area occupied by the connection portion 952 on the cover plate 95 , it helps to improve the space utilization of the battery device 2 in the first direction X.

[0180] The connecting portion 952 covers a portion of the battery cell 3 , and 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 spaced apart, and the orthographic projection of the connecting portion 952 in the first direction X overlaps with a portion of the battery cell 3 .

[0181] 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.

[0182] Optionally, the cover plate 95 includes a protrusion 951 and a connecting portion 952 that are connected to each other, and the protrusion 951 and the connecting portion 952 are integrally formed. The protrusion 951 and the connecting portion 952 are obtained by a substrate through casting, forging, machining or other processing techniques, thereby reducing the joint seams on the cover plate 95 and improving the structural strength of the cover plate 95; or the protrusion 951 and the connecting portion 952 are separately prepared and welded together to facilitate the adjustment of the sizes of the protrusion 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 protrusion 951 .

[0184] Optionally, two battery cell groups 7 are arranged along the second direction Y in the box body 202, and the electrode terminal 61 is 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 protrusion 951, so as to improve the structural strength of the battery device 2.

[0185] Optionally, the connection portion 952 is in contact with the battery cell 3 on one side surface facing the cavity; or a buckle is provided on one of the connection portion 952 and the battery cell 3, and a slot is provided on the other, and the connection portion 952 and the battery cell 3 are snap-connected; or the connection portion 952 and the battery cell 3 are welded together so that the cover plate 95 can be used to fix the battery cell 3.

[0186] In some embodiments, Figure 4 , Figure 5 and Fig.16 As shown, the box body 202 further includes an adhesive layer 97 , which is disposed between the battery cell 3 and the connecting portion 952 , and the connecting portion 952 is adhesively connected to the battery cell 3 via the adhesive layer 97 .

[0187] In these embodiments, the box body 202 also includes an adhesive layer 97 arranged between the battery cell 3 and the connecting portion 952. The connecting portion 952 is adhesively connected to the battery cell 3 through the adhesive layer 97, so that the cover plate 95 and the battery cell 3 are fixed to each other to improve the structural strength of the battery device 2. The setting method of the adhesive layer 97 is easy, which can reduce the processing difficulty of the battery device 2.

[0188] Exemplarily, the battery cell 3 includes an end cover assembly 6, which includes an electrode terminal 61 and a top cover plate 64, and the top cover plate 64 includes a first segment and a second segment arranged along the second direction Y, the first segment and the protrusion 951 are arranged opposite to each other, and the second segment and the connecting portion 952 are arranged opposite to each other, the electrode terminal 61 is arranged in the first segment and accommodated in the groove 96 of the protrusion 951, and the second segment is bonded to the connecting portion 952 through an adhesive layer 97.

[0189] Exemplarily, the adhesive layer 97 is a dispensing adhesive or a double-sided adhesive.

[0190] Optionally, the adhesive layer 97 is an insulating colloid to improve the insulation reliability between the box body 202 and the battery cell 3 and reduce the risk of accidental conduction between the battery cell 3 and the box body 202 .

[0191] Optionally, the adhesive layer 97 is a heat-conducting colloid to facilitate the heat of the battery cells 3 to be transferred to the box body 202 and to exchange heat with the external environment, so as to balance the temperature of the battery cells 3 and improve the performance of the battery device 2 .

[0192] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any embodiment of the first aspect.

[0193] Since the electrical device provided in the second aspect of the present application includes the battery device of any one of the first aspect embodiments, the electrical device provided in the second aspect of the present application has the beneficial effects of the battery device of any one of the first aspect embodiments, which will not be repeated here.

[0194] In some embodiments, Figures 1 to 16 As shown, the battery device 2 includes a box body 202, a battery cell group 7 and a busbar 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 arranged at intervals 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 two electrode terminals 61 are respectively a first terminal 62 and a second terminal 63. The first terminals 62 and the second terminals 63 of two adjacent battery cells 3 are arranged in the same manner in the second direction Y. The busbar 8 extends along the first direction X and is obliquely arranged in the second direction Y. The two ends of the busbar 8 are respectively connected to the first terminals 62 and the second terminals 63 of two adjacent battery cells 3 to connect the adjacent battery cells 3 in series. The spacing L between the two electrode terminals 61 in the second direction Y is 1 The size L of the battery cell 3 in the second direction Y 2 , satisfying 0<L 1 ≤L 2 / 2, the battery cell 3 also includes an outer shell 71 and a first insulating member 91 which are connected to each other, two electrode terminals 61 extend out of the outer shell 71 along the third direction Z, the first insulating member 91 is arranged between the two electrode terminals 61, the positive projection of the electrode terminal 61 in the second direction Y is located in the first insulating member 91, the positive projection of the bus 8 in the second direction Y is located on the first insulating member 91, the electrode terminal 61 includes an end face 613 in the third direction Z, the end face 613 includes a connecting area 614, the bus 8 and the connecting area 614 are connected, the two connecting areas 614 of the two electrode terminals 61 arranged on the same battery cell 3 are arranged away from each other in the second direction Y, the bus 8 also includes an insulating layer 93, the insulating layer 93 is arranged on at least a portion of the surface of the bus 8 in the second direction Y facing the other electrode terminals 61.

[0195] In these embodiments, the battery device 2 includes a case 202, a battery cell group 7 and a busbar 8. The battery cell group 7 is accommodated in the case 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 of each battery cell 3 are located at the same end of the battery cell group 7 in the second direction Y. The busbar 8 extends along the first direction X and is tilted in the second direction Y. The busbar 8 can connect the first terminals 62 and the second terminals 63 of adjacent battery cells 3 to connect the adjacent battery cells 3 in series. The first terminals 62 and the second terminals 63 of adjacent battery cells 3 are connected by the tilted busbar 8 so that the first terminals 62 and the second terminals 63 of adjacent battery cells 3 are arranged in the same manner in the second direction Y, so as to reduce the processing cost of the battery cells 3, simplify the processing process of the battery cell group 7, and save the overall preparation cost of the battery device 2.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A battery cell group is arranged in the box, the battery cell group includes at least two battery cells arranged along a first direction, the battery cells include two electrode terminals arranged at intervals along a second direction, the two electrode terminals are arranged at the same end of the battery cell group in the second direction, the two electrode terminals are respectively a first terminal and a second terminal, and the first terminals and the second terminals of two adjacent battery cells are arranged in the same manner in the second direction; A busbar extends along the first direction and is arranged obliquely in the second direction, two ends of the busbar are respectively connected to the first terminal and the second terminal of two adjacent battery cells to connect the adjacent battery cells in series, 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 battery cell further includes a shell and a first insulating member connected to each other, the two electrode terminals extend from the shell along a third direction, the first insulating member is arranged between the two electrode terminals, and the first direction, the second direction and the third direction intersect each other.

3. The battery device according to claim 2, characterized in that: An orthographic projection of at least one of the electrode terminals in the second direction is located within the first insulating member.

4. The battery device according to claim 2 or 3, 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.

5. The battery device according to claim 4, characterized in that: The busbar includes an extension portion and two busbars, the two busbars are respectively connected to the first terminal and the second terminal of the adjacent battery cells, the extension portion extends in the first direction and is inclined along the second direction to connect the two busbars, The first insulating member includes a first portion, the first portion is located between the busbars of two adjacent busbars, and / or the first insulating member includes a second portion, the second portion is located between the busbars and the extension portion of two adjacent busbars.

6. 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 same 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.

7. 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.

8. The battery device according to claim 1, characterized in that: The two battery cell groups are spaced apart along the second direction, the electrode terminal is arranged at one end of the battery cell group close to the other battery cell group in the second direction, and the first terminal is located between the second terminal and the other battery cell group. The battery cell of at least one of the battery cell groups further includes an outer shell and a second insulating member connected to each other, the two electrode terminals extend from the outer shell along a third direction, the second insulating member 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.

9. The battery device according to claim 8, 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.

10. 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 a side facing the cavity, the busbar and at least part of the electrode terminals are accommodated in the groove, and the first direction, the second direction and the third direction intersect each other.

11. The battery device according to claim 10, characterized in that: The distance between the connecting portion and the battery cell is L3, and the distance between the protruding portion and the battery cell is L4, satisfying L3<L4. The connecting portion covers part of the battery cell.

12. The battery device according to claim 10, characterized in that: The box body further includes an adhesive layer, which is disposed between the battery cell and the connecting portion, and the connecting portion is adhesively connected to the battery cell through the adhesive layer.

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

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