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 accommodated in the box body, the battery monomer group comprises a hard-shell battery monomer and at least two soft-package battery monomers, the hard-shell battery monomer is arranged between two adjacent soft-package battery monomers in a first direction, the soft-package battery monomer comprises a first shell and a first electrode assembly, and the first shell is arranged in the first shell; the first shell comprises a main body part and an edge sealing part extending out of the main body part, the first electrode assembly is arranged in the main body part, and the orthographic projection of the edge sealing part in the first direction is at least partially overlapped with the orthographic projection of the hard shell battery monomer adjacent to the edge sealing part in the first direction; therefore, the risk of spreading of thermal runaway in the box body due to the damage of the adjacent soft-package battery monomers caused by the damage of the adjacent soft-package battery monomers due to the damage of high-temperature sprayed objects during thermal runaway of the soft-package battery monomers is reduced, and the reliability of the battery device is improved.

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 monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] Soft-pack battery cells have attracted much attention due to their large battery capacity and high energy density, but the reliability of soft-pack batteries still needs to be improved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of soft-pack battery cells and the overall battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a case; a battery cell group accommodated in the case, the battery cell group comprising a hard-shell battery cell and at least two soft-pack battery cells, the hard-shell battery cell being arranged between two adjacent soft-pack battery cells in a first direction, wherein the soft-pack battery cell comprises a first outer shell and a first electrode assembly, the first outer shell comprising a main body and an edge sealing portion extending from the main body, the first electrode assembly being arranged in the main body, and the orthographic projection of the edge sealing portion in the first direction at least partially overlaps with the orthographic projection of the hard-shell battery cell adjacent thereto in the first direction.

[0006] In the scheme of the embodiment of the present application, the battery device includes a case and a battery cell group, the battery cell group is accommodated in the case, the battery cell group includes a hard-shell battery cell and at least two soft-pack battery cells, the soft-pack battery cell includes a first shell and a first electrode assembly, the first shell includes a main body and an edge sealing portion extending from the main body, and the first electrode assembly is arranged in the main body. By arranging the hard-shell battery cell between two adjacent soft-pack battery cells in a first direction, and the orthographic projection of the edge sealing portion in the first direction and the orthographic projection of the hard-shell battery cell adjacent to it in the first direction at least partially overlap, so as to separate at least part of the edge sealing portions of two adjacent soft-pack battery cells in the first direction by the hard-shell battery cell, so as to reduce the risk of high-temperature ejecta during thermal runaway of the soft-pack battery cell damaging the edge sealing portion of the adjacent soft-pack battery cell, causing damage to the adjacent soft-pack battery cell, and causing the risk of thermal runaway spreading in the case, thereby improving the reliability of the battery device.

[0007] In these embodiments, the edge seal portion includes a first edge seal and a second edge seal, the first edge seal extends from both ends of the main body in the second direction, the second edge seal extends from one end of the main body in the third direction, the first direction, the second direction and the third direction intersect with each other, and the hard shell battery cell includes a pressure relief mechanism, which is arranged on one side end surface of the hard shell battery cell away from the second edge seal in the third direction.

[0008] In the scheme of the embodiment of the present application, the edge sealing portion includes a first edge sealing portion extending from both ends of the main body in the second direction, and a second edge sealing portion extending from one end of the main body in the third direction. The pressure relief mechanism of the hard shell battery cell is arranged on a side end surface of the hard shell battery cell in the third direction away from the second edge sealing portion, so that the pressure relief mechanism is away from the edge sealing portion, thereby reducing the risk of damaging the edge sealing portion of the adjacent soft-pack battery cell when the hard shell battery cell thermally runs away, causing the thermal runaway to spread in the box, and improving the reliability of the battery device.

[0009] In these embodiments, the dimensions of the pressure relief mechanism in the second direction to the two first sealing edges are the same.

[0010] In the solution of the embodiment of the present application, the dimensions of the pressure relief mechanism in the second direction to the two first sealed edges are the same, so that the pressure relief mechanism is away from the first sealed edges, thereby reducing the risk of damaging the first sealed edges of adjacent soft-pack battery cells when the hard-shell battery cell thermally runs away, causing the thermal runaway to spread in the box, thereby improving the reliability of the battery device.

[0011] In these embodiments, the battery device further includes a first busbar and a second busbar, the first busbar is connected to the hard-shell battery cells, and the second busbar is connected to the soft-pack battery cells.

[0012] In the scheme of the embodiment of the present application, the battery device also includes a first busbar component and a second busbar component, which are respectively connected to the hard-shell battery cell and the soft-pack battery cell through the first busbar component and the second busbar component, so as to improve the problem of difficulty in connecting the hard-shell battery cell, the soft-pack battery cell and the busbar component due to the different shapes and sizes of the hard-shell battery cell and the soft-pack battery cell, thereby improving the reliability of the battery device.

[0013] In these embodiments, the first busbar component is arranged on one side of the battery cell group in the second direction, the second busbar component is arranged on one side of the battery cell group in the third direction, or the first busbar component and the second busbar component are respectively arranged on both sides of the battery cell group in the second direction or the third direction, and the first direction, the second direction and the third direction intersect each other.

[0014] In the scheme of the embodiments of the present application, the first convergence component is arranged on one side of the battery cell group in the second direction, the second convergence component is arranged on one side of the battery cell group in the third direction, or the first convergence component and the second convergence component are respectively arranged on both sides of the battery cell group in the second direction or the third direction. By arranging the first convergence component and the second convergence component on different end surfaces of the battery cell group, the problem of interference between the first convergence component and the second convergence component, which causes difficulty in setting up the first convergence component and the second convergence component, is improved, thereby improving the reliability of the battery device.

[0015] In these embodiments, the edge sealing portion is disposed around the main body portion, and the orthographic projections of the edge sealing portion on the peripheral side of the main body portion along the first direction are all located within the orthographic projections of the hard shell battery cell along the first direction.

[0016] In the scheme of the embodiment of the present application, the edge sealing portion is arranged around the main body, and the orthographic projections of the edge sealing portions on the peripheral sides of the main body along the first direction are all located within the orthographic projections of the hard-shell battery cells along the first direction, so that the hard-shell battery cells can shield the edge sealing portions of the main body of the soft-pack battery cells on their peripheral sides, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cells to the edge sealing portions of the soft-pack battery cells adjacent to them in the first direction when the soft-pack battery cells have thermal runaway, reduce the risk of thermal runaway spreading in the box, and improve the reliability of the battery device.

[0017] In these embodiments, the hard shell battery cell includes a first surface relatively arranged along a first direction, the first surface includes a first area, the orthographic projection of the main body along the first direction on the adjacent hard shell battery cell is located within the first area, the edge value of the first area and the edge of the first surface are spaced apart by L1, and the extension dimension of the edge sealing portion away from the main body is L2, satisfying 0<L1≤L2.

[0018] In the scheme of the embodiment of the present application, the spacing between the edge value of the first area and the edge of the first surface is L1, and the extension dimension of the edge sealing portion away from the main body is L2. When the above conditions are met, the hard-shell battery cell can fully block the edge sealing portion of the soft-pack battery cell adjacent to the first direction, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cell to the edge sealing portion of the soft-pack battery cell adjacent to the first direction when the soft-pack battery cell has thermal runaway, thereby reducing the risk of thermal runaway spreading in the box body and improving the reliability of the battery device.

[0019] In these embodiments, at least two battery cell groups are spaced apart along the second direction, and the battery device further includes a heat exchange mechanism extending along the first direction between two battery cell groups adjacent to each other in the second direction, and the first direction and the second direction intersect.

[0020] In the scheme of the embodiment of the present application, the battery device also includes a heat exchange mechanism extending along the first direction between two battery cell groups adjacent in the second direction. The heat exchange mechanism is used to separate the soft-pack battery cells adjacent in the second direction to reduce the damage of the high-temperature ejecta of the soft-pack battery cells to the edge sealing parts of the soft-pack battery cells adjacent in the second direction when the soft-pack battery cells have thermal runaway, thereby reducing the risk of thermal runaway spreading in the box and improving the reliability of the battery device.

[0021] In these embodiments, at least two battery cell groups are spaced apart along the second direction, and the orthographic projection of the soft-pack battery cells in one battery cell group in the second direction at least partially overlaps with the orthographic projection of the hard-shell battery cells in the adjacent battery cell group in the second direction.

[0022] In the scheme of the embodiment of the present application, the orthographic projection of the soft-pack battery cell in one battery cell group in the second direction at least partially overlaps with the orthographic projection of the hard-shell battery cell in the adjacent battery cell group in the second direction, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cell to the edge sealing portion of the adjacent soft-pack battery cell in the second direction when the soft-pack battery cell has thermal runaway, reduce the risk of thermal runaway spreading in the box, and improve the reliability of the battery device.

[0023] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the application;

[0028] Figure 4 is an exploded view of a battery cell provided in one embodiment of the present application;

[0029] Figure 5 is an exploded view of a soft-pack battery cell of a battery device provided in one embodiment of the present application;

[0030] Figure 6 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0031] Figure 7 is a schematic diagram of a hard-shell battery cell structure of a battery device provided in another embodiment of the present application;

[0032] Figure 8 is a schematic structural diagram of a battery device provided in another embodiment of the present application;

[0033] Fig. 9 yes Figure 8 A schematic diagram of the enlarged structure at A in the middle;

[0034] Fig.10 is a structural schematic diagram of a battery device provided in another embodiment of the present application;

[0035] Fig.11 is a structural schematic diagram of a battery device provided in another embodiment of the present application;

[0036] Fig.12 is a structural schematic diagram of a battery device provided in another embodiment of the present application;

[0037] Fig.13 is a partial structural schematic diagram of a battery cell group of a battery device provided in one embodiment of the present application;

[0038] Fig.14 It is a structural schematic diagram of a battery device provided in one embodiment of the present application.

[0039] Reference numerals:

[0040] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0041] 3. Battery cells;

[0042] 4. Shell;

[0043] 5. electrode assembly; 51. pole ear; 52. electrode body;

[0044] 6. Top cover assembly; 61. Electrode terminal;

[0045] 7. Battery cell group; 71. Hard shell battery cell; 72. Soft pack battery cell; 721. First shell; 722. First electrode assembly; 723. Edge sealing portion; 724. Main body; 7231. First edge sealing portion; 7232. Second edge sealing portion; 711. First surface; 712. First region; 713. Pressure relief mechanism; 725. Electrode lead-out member;

[0046] 81. a first confluence component; 82. a second confluence component; 83. a heat exchange mechanism;

[0047] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Soft-pack battery cells have attracted much attention due to their large battery capacity and high energy density, but the reliability of soft-pack batteries still needs to be improved.

[0056] The reason for the above problem is that when some soft-pack battery cells in the box are in thermal runaway, the high-temperature ejecta of the soft-pack battery cells in thermal runaway will damage other soft-pack battery cells, causing other soft-pack batteries to be damaged and melted, causing the thermal runaway to spread among the soft-pack battery cells in the box.

[0057] Based on the above problems, an embodiment of the present application provides a battery device, which includes a case and a battery cell group, wherein the battery cell group is accommodated in the case, the battery cell group includes a hard-shell battery cell and at least two soft-pack battery cells, the soft-pack battery cell includes a first shell and a first electrode assembly, the first shell includes a main body and an edge sealing portion extending from the main body, and the first electrode assembly is arranged in the main body. By arranging the hard-shell battery cell between two adjacent soft-pack battery cells in a first direction, and the orthographic projection of the edge sealing portion in the first direction and the orthographic projection of the hard-shell battery cell adjacent to it in the first direction at least partially overlap, so as to separate at least part of the edge sealing portions of two adjacent soft-pack battery cells in the first direction by the hard-shell battery cell, so as to reduce the risk of high-temperature ejecta during thermal runaway of the soft-pack battery cell damaging the edge sealing portions of adjacent soft-pack battery cells, causing damage to the adjacent soft-pack battery cells, and causing the risk of thermal runaway spreading in the case, thereby improving the reliability of the battery device.

[0058] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0068] 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 a busbar.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0070] 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.

[0071] 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 .

[0072] 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.

[0073] 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 .

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0078] 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.

[0079] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0080] In the present application, the battery cell 3 may include a lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., which is not limited in the embodiments of the present application.

[0081] 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. Figure 4 The battery cell 3 includes a top cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0082] 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 at both ends of the electrode body 52, respectively. 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 to form a current loop.

[0083] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0084] 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.

[0085] 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.

[0086] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0087] 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.

[0088] The battery cell may include a shell. The shell 4 is a component used to cooperate with the top cover 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.

[0089] 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.

[0090] The housing 4 and the top cover assembly 6 may be independent components, and one or more openings may be provided on the housing 4, and one or more top cover assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the top cover assembly 6 and the housing 4 may be integrated. Optionally, the top cover 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 top cover assembly 6 covers the housing 4.

[0091] In some embodiments, the electrode terminal 61 may be disposed on the top cover 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.

[0092] See also Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of a battery device provided in one embodiment of the present application; Figure 6 1 is an exploded view of a soft-pack battery cell of a battery device provided in one embodiment of the present application.

[0093] First, as Figure 5 and Figure 6As shown, the present application provides a battery device 2, which includes a box body 202 and a battery cell group 7, the battery cell group 7 is accommodated in the box body 202, the battery cell group 7 includes a hard-shell battery cell 71 and at least two soft-pack battery cells 72, the hard-shell battery cell 71 is arranged between two adjacent soft-pack battery cells 72 in a first direction X, wherein the soft-pack battery cell 72 includes a first shell 721 and a first electrode assembly 722, the first shell 721 includes a main body 724 and a sealing edge 723 extending from the main body 724, the first electrode assembly 722 is arranged in the main body 724, and the orthographic projection of the sealing edge 723 in the first direction X at least partially overlaps with the orthographic projection of the hard-shell battery cell 71 adjacent to it in the first direction X.

[0094] In the solution of the embodiment of the present application, the battery device 2 includes a box body 202 and a battery cell group 7, the battery cell group 7 is accommodated in the box body 202, the battery cell group 7 includes a hard shell battery cell 71 and at least two soft pack battery cells 72, the soft pack battery cell 72 includes a first shell 721 and a first electrode assembly 722, the first shell 721 includes a main body 724 and a sealing edge 723 extending from the main body 724, the first electrode assembly 722 is arranged in the main body 724, and the hard shell battery cell 71 is arranged on the two soft pack battery cells adjacent to each other in the first direction X. The battery cells 72 are arranged between the battery cells 72, and the orthographic projection of the edge sealing portion 723 in the first direction X at least partially overlaps with the orthographic projection of the hard-shell battery cell 71 adjacent to it in the first direction X, so that at least part of the edge sealing portions 723 of two adjacent soft-pack battery cells 72 in the first direction X are separated by the hard-shell battery cell 71, so as to reduce the risk of high-temperature ejecta damaging the edge sealing portions 723 of adjacent soft-pack battery cells 72 when the soft-pack battery cells 72 are thermally runaway, causing damage to the adjacent soft-pack battery cells 72, and causing the risk of thermal runaway spreading in the box body 202, thereby improving the reliability of the battery device 2.

[0095] The battery cell group 7 includes several battery cells of the above-mentioned embodiments, and the battery cells specifically include two types: hard shell battery cells 71 and soft pack battery cells 72. The hard shell battery cells 71 can be square shell battery cells or cylindrical battery cells or blade battery cells 3, etc. The hard shell battery cells 71 include a second shell and a second electrode assembly 5, and the material of the second shell can be aluminum or steel, etc.; the soft pack battery cells 72 include a first shell 721 and a first electrode assembly 722, and the material of the first shell 721 can be aluminum plastic film, steel plastic film or other metal plastic film, etc.

[0096] Optionally, the box body 202 may include one or more battery cell groups 7, and each battery cell group 7 may be independent of each other, or each battery cell group 7 may be electrically connected together in series or in parallel through an electrical connector.

[0097] The battery cell group 7 may include n soft-pack battery cells 72 and m hard-shell battery cells 71 arranged along the first direction X, where n≥2 and m≥1, so that a hard-shell battery cell 71 is disposed between at least two adjacent soft-pack battery cells 72 .

[0098] Optionally, in the battery cell group 7 , one or more hard-shell battery cells 71 may be disposed between adjacent soft-pack battery cells 72 . Exemplarily, one, two, or three hard-shell battery cells 71 may be disposed between adjacent soft-pack battery cells 72 .

[0099] Optionally, the battery cell group 7 may include n soft-pack battery cells 72 and m hard-shell battery cells 71 arranged along the first direction X, n≥2, m=n-1, and a hard-shell battery cell 71 is arranged between adjacent soft-pack battery cells 72, so that the soft-pack battery cells 72 and the hard-shell battery cells 71 in the battery cell group 7 are reasonably arranged.

[0100] The soft-pack battery cell 72 includes a first shell 721 and a first electrode assembly 722 . The first shell 721 includes two packaging films arranged opposite to each other. The edge portions of the two packaging films are connected to each other to form a sealing edge portion 723 . The middle portions of the two packaging films form a main body portion 724 for accommodating the first electrode assembly 722 .

[0101] When the soft-pack battery cell 72 in the box 202 is in thermal runaway, its edge seal 723 has a relatively low structural strength, and high-temperature substances are more likely to be ejected from the edge seal 723. When the high-temperature ejected substances are ejected to the adjacent soft-pack battery cell 72, the edge seal 723 of the adjacent soft-pack battery cell 72 is easily melted, resulting in thermal runaway of the adjacent battery cell 3. The high-temperature ejected substances from the soft-pack battery cell 72 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative pole pieces, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0102] Therefore, in the embodiment of the present application, a hard shell battery cell 71 is arranged between adjacent soft-pack battery cells 72, and the orthographic projection of the edge sealing portion 723 in the first direction X and the orthographic projection of the hard shell battery cell 71 adjacent to it in the first direction X at least partially overlap, and the adjacent edge sealing portions 723 are separated by the hard shell battery cell 71, so that when the soft-pack battery cell 72 thermally runs away, the hard shell battery cell 71 can block at least part of the high-temperature ejecta, so as to reduce the risk of damage to the adjacent battery cell 3.

[0103] The orthographic projection of the edge sealing portion 723 in the first direction X and the orthographic projection of the adjacent hard shell battery cell 71 in the first direction X at least partially overlap, then the orthographic projection of the edge sealing portion 723 in the first direction X is on its adjacent hard shell battery cell 71, specifically, the orthographic projection of the edge sealing portion 723 and the main body 724 of the soft-pack battery cell 72 in the first direction X is on its adjacent hard shell battery cell 71, or the main body 724 and part of the edge sealing portion 723 of the soft-pack battery cell 72 in the first direction X is on its adjacent hard shell battery cell 71, or the part of the main body 724 and part of the edge sealing portion 723 of the soft-pack battery cell 72 in the first direction X is on its adjacent hard shell battery cell 71.

[0104] Optionally, the hard shell battery cell 71 is a square shell battery cell, which includes two end faces arranged opposite to each other in its height direction, and side faces connected between the two end faces, the side faces include two first side faces arranged opposite to each other in a first direction X and two second side faces arranged opposite to each other in a second direction Y, the surface area of ​​the first side face is greater than the surface area of ​​the second side face, and the orthographic projection of the soft-pack battery cell 72 in the first direction X is on the adjacent first side face.

[0105] Optionally, gaps or elastic members are provided between adjacent soft-pack battery cells 72 and hard-shell battery cells 71 in the first direction X to absorb expansion and deformation of the soft-pack battery cells 72 and the hard-shell battery cells 71 and reduce the risk of mutual compression and damage between the two.

[0106] See also Figure 7 , Figure 7 It is a schematic structural diagram of a hard-shell battery cell 71 of a battery device 2 provided in another embodiment of the present application.

[0107] In these embodiments, Figure 6 and Figure 7 As shown, the edge sealing portion 723 is arranged around the main body portion 724, and the orthographic projections of the edge sealing portion 723 on the peripheral side of the main body portion 724 along the first direction X are all located within the orthographic projections of the hard shell battery cell 71 along the first direction X.

[0108] In these embodiments, the edge sealing portion 723 is arranged around the main body 724, and the orthographic projections of the edge sealing portions 723 on the peripheral sides of the main body 724 along the first direction X are all located within the orthographic projections of the hard shell battery cell 71 along the first direction X, so that the hard shell battery cell 71 can shield the edge sealing portions 723 of the main body 724 of the soft-pack battery cell 72 at various locations on its peripheral sides, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cell 72 to the edge sealing portions 723 of the soft-pack battery cell 72 adjacent to it in the first direction X when the soft-pack battery cell 72 has thermal runaway, thereby reducing the risk of thermal runaway spreading in the box 202 and improving the reliability of the battery device 2.

[0109] The hard shell battery cell 71 includes a first surface 711 relatively arranged along a first direction X, the first surface 711 includes a first area 712, the orthographic projection of the main body 724 along the first direction X on the adjacent hard shell battery cell 71 is located in the first area 712, and the distance between the edge value of the first area 712 and the edge of the first surface 711 is L1, L1>0, which means that the orthographic projection of the edge sealing portion 723 on the peripheral side of the main body 724 along the first direction X is located between the first area 712 and the edge of the first surface 711, so that in the circumferential direction of the main body 724, the hard shell battery cell 71 can block the high-temperature ejecta of the edge sealing portion 723 at various locations on the peripheral side of the main body 724.

[0110] See also Figure 8 and Fig. 9 , Figure 8 is a structural schematic diagram of a battery device 2 provided in another embodiment of the present application; Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure at point A in the middle.

[0111] In these embodiments, Figure 8 and Fig. 9 As shown, the hard shell battery cell 71 includes a first surface 711 relatively arranged along a first direction X, the first surface 711 includes a first area 712, the orthographic projection of the main body 724 along the first direction X on the adjacent hard shell battery cell 71 is located in the first area 712, the distance between the edge value of the first area 712 and the edge of the first surface 711 is L1, and the extension dimension of the edge sealing portion 723 away from the main body 724 is L2, satisfying 0<L1≤L2.

[0112] In these embodiments, the distance between the edge value of the first region 712 and the edge of the first surface 711 is L1, and the extension dimension of the edge sealing portion 723 away from the main body 724 is L2. When the above conditions are met, the hard shell battery cell 71 can fully block the edge sealing portion 723 of the adjacent soft-pack battery cell 72 in the first direction X, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cell 72 to the edge sealing portion 723 of the adjacent soft-pack battery cell 72 in the first direction X when the soft-pack battery cell 72 has thermal runaway, thereby reducing the risk of thermal runaway spreading in the box 202 and improving the reliability of the battery device 2.

[0113] When the soft-pack battery cell 72 is placed in the box body 202, in order to save the internal space of the box body 202, the edge sealing portion 723 is often bent toward the main body 724. At this time, the end of the edge sealing portion 723 away from the main body 724 is arranged along the first direction X pointing to the hard shell battery cell 71. When the soft-pack battery cell 72 thermally runs away, the edge sealing portion 723 melts, at least part of the high-temperature ejected matter is blocked by the hard shell battery cell 71.

[0114] Optionally, L1=L2. At this time, when the pressure of the high-temperature ejecta is too large, causing the edge sealing portion 723 to completely change from a bent state to a straight state, when the high-temperature ejecta is ejected from the edge of the edge sealing portion 723, the hard shell battery cell 71 can still play the role of shielding and guiding the high-temperature ejecta, the reliability of the battery device 2 is improved, and it is convenient to match the positions of the hard shell battery cell 71 and the soft-pack battery cell 72, thereby improving the energy density of the battery device 2.

[0115] Optionally, L1>L2, the hard-shell battery cell 71 can reliably shield the high-temperature ejecta of the soft-pack battery cell 72, reduce the risk of damaging other soft-pack battery cells 72 when the soft-pack battery cell 72 has thermal runaway, and improve the reliability of the battery device 2.

[0116] See also Fig.10 , Fig.10 It is a schematic structural diagram of a battery device 2 provided in yet another embodiment of the present application.

[0117] In these embodiments, Fig.10 As shown, at least two battery cell groups 7 are arranged at intervals along the second direction Y. The battery device 2 also includes a heat exchange mechanism 83, which extends along the first direction X between two adjacent battery cell groups 7 in the second direction Y. The first direction X and the second direction Y intersect.

[0118] In these embodiments, the battery device 2 also includes a heat exchange mechanism 83 extending along the first direction X between two battery cell groups 7 adjacent to each other in the second direction Y. The heat exchange mechanism 83 separates the soft-pack battery cells 72 adjacent to each other in the second direction Y to reduce the damage of the high-temperature ejecta of the soft-pack battery cells 72 to the edge sealing portions 723 of the soft-pack battery cells 72 adjacent to each other in the second direction Y when the soft-pack battery cells 72 have thermal runaway, thereby reducing the risk of thermal runaway spreading in the box 202 and improving the reliability of the battery device 2.

[0119] The box body 202 includes at least two battery cell groups 7 spaced apart along the second direction Y. Different battery cell groups 7 may include a certain number of hard-shell battery cells 71 and soft-pack battery cells 72. The arrangement order of the hard-shell battery cells 71 and the soft-pack battery cells 72 in each battery cell group 7 is the same or different.

[0120] Exemplarily, the heat exchange mechanism 83 can be a water-cooled plate, which has a metal shell such as copper or stainless steel. The water-cooled plate can be used to shield the high-temperature ejecta of the soft-pack battery cells 72 and can transfer the heat of the high-temperature ejecta as quickly as possible to reduce damage to other soft-pack battery cells 72.

[0121] Optionally, the orthographic projection of the soft-pack battery cell 72 in the second direction Y is located on the heat exchange mechanism 83 to reduce damage to adjacent soft-pack battery cells 72 caused by thermal runaway of the soft-pack battery cell 72 .

[0122] Optionally, the extension dimension of the heat exchange mechanism 83 in the first direction X is greater than or equal to the dimension of the battery cell group 7 , so that the heat exchange mechanism 83 can fully shield the soft-pack battery cells 72 of the adjacent battery cell group 7 .

[0123] See also Fig.11 and Fig.12 , Fig.11 is a structural schematic diagram of a battery device 2 provided in another embodiment of the present application; Fig.12 It is a schematic structural diagram of a battery device 2 provided in yet another embodiment of the present application.

[0124] In these embodiments, Fig.11 and Fig.12 As shown, at least two battery cell groups 7 are arranged at intervals along the second direction Y, and the orthographic projection of the soft-pack battery cell 72 in one battery cell group 7 in the second direction Y at least partially overlaps with the orthographic projection of the hard-shell battery cell 71 in the adjacent battery cell group 7 in the second direction Y.

[0125] In these embodiments, the orthographic projection of the soft-pack battery cell 72 in one battery cell group 7 in the second direction Y at least partially overlaps with the orthographic projection of the hard-shell battery cell 71 in the adjacent battery cell group 7 in the second direction Y, so as to reduce the damage of the high-temperature ejecta of the soft-pack battery cell 72 to the sealing edge 723 of the adjacent soft-pack battery cell 72 in the second direction Y when the soft-pack battery cell 72 has thermal runaway, reduce the risk of thermal runaway spreading in the box 202, and improve the reliability of the battery device 2.

[0126] Optionally, a heat exchange mechanism 83 extending along the first direction X is provided between two adjacent battery cell groups 7 in the second direction Y to reduce damage to other soft-pack battery cells 72 caused by a soft-pack battery cell 72 in thermal runaway.

[0127] Optionally, two adjacent battery cell groups 7 have the same extension dimensions in the first direction X, and the soft-pack battery cells 72 and the hard-shell battery cells 71 in the two adjacent battery cell groups 7 are arranged in the same order, and the soft-pack battery cells 72 and the hard-shell battery cells 71 in the two adjacent battery cell groups 7 are arranged opposite each other in the second direction Y.

[0128] See also Fig.13 , Fig.13 It is a partial structural diagram of a battery cell group 7 of a battery device 2 provided in an embodiment of the present application.

[0129] In these embodiments, Fig.12 and Fig.13As shown, the edge sealing portion 723 includes a first edge sealing portion 7231 and a second edge sealing portion 7232, the first edge sealing portion 7231 extends from both ends of the main body portion 724 in the second direction Y, and the second edge sealing portion 7232 extends from one end of the main body portion 724 in the third direction Z, the first direction X, the second direction Y and the third direction Z intersect in pairs, and the hard shell battery cell 71 includes a pressure relief mechanism 713, and the pressure relief mechanism 713 is arranged on one side end surface of the hard shell battery cell 71 in the third direction Z away from the second edge sealing portion 7232.

[0130] In these embodiments, the edge sealing portion 723 includes a first edge sealing portion 7231 extending from both ends of the main body 724 in the second direction Y, and a second edge sealing portion 7232 extending from one end of the main body 724 in the third direction Z. The pressure relief mechanism 713 of the hard shell battery cell 71 is arranged on a side end surface of the hard shell battery cell 71 in the third direction Z away from the second edge sealing portion 7232, so that the pressure relief mechanism 713 is away from the edge sealing portion 723, thereby reducing the risk of damaging the edge sealing portion 723 of the adjacent soft-pack battery cell 72 when the hard shell battery cell 71 thermally runs away, causing the thermal runaway to spread in the box body 202, thereby improving the reliability of the battery device 2.

[0131] The first shell 4 of the soft-pack battery cell 72 is formed by folding a complete substrate in half. Specifically, the substrate can be an aluminum-plastic film, a steel-plastic film or other metal-plastic film. The substrate is folded along a fold line extending in the second direction Y. The two ends of the folded substrate are connected to each other in the second direction Y to form a first edge seal 7231, and the ends of the folded substrate are connected to each other in the third direction Z to form a second edge seal 7232.

[0132] As an example, the pressure relief mechanism 713 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the hard shell battery cell 71 reaches a predetermined threshold. When the internal pressure or temperature of the hard shell battery cell 71 reaches a predetermined threshold, the pressure relief mechanism 713 performs an action or a weak structure provided in the pressure relief mechanism 713 is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the isolation membrane in the hard shell battery cell 71.

[0133] As an example, the pressure relief mechanism 713 may be integrally formed with the housing 4 , for example, a notch is made on the second housing of the hard shell battery cell 71 to form a weak structure, and the weak structure serves as the pressure relief mechanism 713 .

[0134] The pressure relief mechanism 713 may also be separately provided and connected to the second housing, for example, the pressure relief mechanism 713 is connected to the second housing by welding or by other components. As an example, a notch is provided on the pressure relief mechanism 713 to form a weak structure.

[0135] As an example, the pressure relief mechanism 713 may be in the form of an explosion-proof valve, a balancing valve, an air valve, a pressure relief valve, or a safety valve.

[0136] The "actuation" mentioned in this application means that the pressure relief mechanism 713 is in action or activated to a certain state, so that the internal pressure and temperature of the hard shell battery cell 71 can be released. The action produced by the pressure relief mechanism 713 may include but is not limited to: the components in the pressure relief mechanism 713 move to form an exhaust channel, at least a part of the pressure relief mechanism 713 ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 713 is actuated, the high-temperature and high-pressure substances inside the hard shell battery cell 71 will be discharged from the actuated part as emissions. In this way, the hard shell battery cell 71 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0137] When the pressure relief mechanism 713 is arranged on one side end face of the hard shell battery cell 71 in the third direction Z, away from the second edge sealing 7232, the distance between the pressure relief mechanism 713 and the edge sealing portion 723 is larger than that when the pressure relief mechanism 713 is arranged on other end faces of the hard shell battery cell 71 in the second direction Y and the third direction Z. In this way, when the pressure relief mechanism 713 is braked, the damage of the high-temperature ejecta of the pressure relief mechanism 713 to the edge sealing portion 723 of the adjacent soft-pack battery cell 72 is reduced, thereby reducing the risk of the edge sealing portion 723 melting.

[0138] Optionally, along the third direction Z, the distance between the pressure relief mechanism 713 and one end of the soft-pack battery cell 72 away from the second sealing edge 7232 is greater than 0, so as to reduce the damage of the high-temperature ejection of the pressure relief mechanism 713 to the main body 724 of the adjacent soft-pack battery cell 72 .

[0139] In these embodiments, Fig.12 and Fig.13 As shown, the dimensions of the pressure relief mechanism 713 in the second direction Y to the two first sealing edges 7231 are the same.

[0140] In these embodiments, the dimensions of the pressure relief mechanism 713 to the two first sealing edges 7231 in the second direction Y are the same, so that the pressure relief mechanism 713 is away from the first sealing edge 7231, thereby reducing the risk of damaging the first sealing edge 7231 of the adjacent soft-pack battery cell 72 when the hard-shell battery cell 71 thermally runs away, causing the thermal runaway to spread in the box body 202, thereby improving the reliability of the battery device 2.

[0141] Optionally, the pressure relief mechanism 713 is disposed in the middle area of ​​the hard shell battery cell 71 in the first direction X to increase the size of the pressure relief mechanism 713 and the adjacent soft pack battery cell 72 in the first direction X, thereby reducing the damage of the high temperature ejected matter of the pressure relief mechanism 713 to the adjacent soft pack battery cell 72.

[0142] See also Fig.14 , Fig.14 It is a schematic diagram of the structure of a battery device 2 provided in one embodiment of the present application.

[0143] In these embodiments, Fig.13 and Fig.14 As shown, the battery device 2 further includes a first busbar 81 and a second busbar 82 . The first busbar 81 is connected to the hard-shell battery cell 71 , and the second busbar 82 is connected to the soft-pack battery cell 72 .

[0144] In these embodiments, the battery device 2 further includes a first busbar component 81 and a second busbar component 82, which are respectively connected to the hard-shell battery cell 71 and the soft-pack battery cell 72 through the first busbar component 81 and the second busbar component 82, so as to improve the problem of difficulty in connecting the hard-shell battery cell 71 and the soft-pack battery cell 72 and the busbar components due to the different shapes and sizes of the hard-shell battery cell 71 and the soft-pack battery cell 72, thereby improving the reliability of the battery device 2.

[0145] The first busbar component 81 connects each hard-shell battery cell 71 to the positive and negative terminals of the battery device 2 in parallel or in series, and the second busbar component 82 connects each soft-pack battery cell 72 to the positive and negative terminals of the battery device 2 in parallel or in series. The battery device 2 forms a circuit through its positive and negative terminals and external components.

[0146] The first busbar 81 and the second busbar 82 need to be connected to the hard-shell battery cell 71 and the soft-pack battery cell 72 respectively. The sizes and shapes of the first busbar 81 and the second busbar 82 match the hard-shell battery cell 71 and the soft-pack battery cell 72 respectively to reduce the difficulty of connecting the busbars.

[0147] Optionally, the first collector component 81 and the second collector component 82 are disposed at the same end of the battery cell group 7 in the second direction Y or the third direction Z to improve space utilization in the box body 202 .

[0148] In these embodiments, Figure 5 , Fig.13 and Fig.14 As shown, the first busbar component 81 is arranged on one side of the battery cell group 7 in the second direction Y, and the second busbar component 82 is arranged on one side of the battery cell group 7 in the third direction Z, or the first busbar component 81 and the second busbar component 82 are respectively arranged on both sides of the battery cell group 7 in the second direction Y or the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0149] In these embodiments, the first convergence component 81 is arranged on one side of the battery cell group 7 in the second direction Y, the second convergence component 82 is arranged on one side of the battery cell group 7 in the third direction Z, or the first convergence component 81 and the second convergence component 82 are respectively arranged on both sides of the battery cell group 7 in the second direction Y or the third direction Z. By arranging the first convergence component 81 and the second convergence component 82 on different end surfaces of the battery cell group 7, the problem of interference between the first convergence component 81 and the second convergence component 82, which makes it difficult to arrange the first convergence component 81 and the second convergence component 82, is improved, thereby improving the reliability of the battery device 2.

[0150] Exemplarily, the first convergence component 81 and the second convergence component 82 are respectively arranged at both ends of the battery cell group 7 in the second direction Y, or the first convergence component 81 and the second convergence component 82 are respectively arranged at both ends of the battery cell group 7 in the third direction Z, or the first convergence component 81 is arranged at one end of the battery cell group 7 in the second direction Y, and the second convergence component 82 is arranged at one end of the battery cell group 7 in the third direction Z, or the first convergence component 81 is arranged at one end of the battery cell group 7 in the third direction Z, and the second convergence component 82 is arranged at one end of the battery cell group 7 in the second direction Y.

[0151] Optionally, the hard shell battery cell 71 includes an electrode terminal 61, which is connected to the second electrode assembly 5 and the first busbar 81, and the soft pack battery cell 72 includes an electrode lead-out piece 725, which is exposed from the edge sealing portion 723, and the electrode lead-out piece 725 is connected to the first electrode assembly 722 and the second busbar 82, and the electrode terminal 61 is arranged on one side of the battery cell group 7 in its second direction Y, and the electrode lead-out piece 725 is arranged on one side of the battery cell group 7 in its third direction Z, or the electrode terminal 61 and the electrode lead-out piece 725 are arranged on both sides of the battery cell group 7 in its second direction Y or third direction Z.

[0152] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above.

[0153] In some embodiments, Figures 1 to 14As shown, the battery device 2 includes a box body 202 and a battery cell group 7, the battery cell group 7 is accommodated in the box body 202, the battery cell group 7 includes a hard shell battery cell 71 and at least two soft-pack battery cells 72, the hard shell battery cell 71 is arranged between two soft-pack battery cells 72 adjacent to each other in the first direction X, wherein the soft-pack battery cell 72 includes a first shell 721 and a first electrode assembly 722, the first shell 721 includes a main body 724 and an edge sealing portion 723 extending from the main body 724, the edge sealing portion 723 is arranged around the main body 724, the first electrode assembly 722 is arranged in the main body 724, and the edge sealing portion 723 on the peripheral side of the main body 724 The orthographic projections along the first direction X are all located within the orthographic projections of the hard shell battery cells 71 along the first direction X and at least partially overlap with the orthographic projections of the adjacent hard shell battery cells 71 along the first direction X. The hard shell battery cells 71 include first surfaces 711 arranged opposite to each other along the first direction X. The first surface 711 includes a first area 712. The orthographic projections of the main body 724 along the first direction X at the adjacent hard shell battery cells 71 are located within the first area 712. The distance between the edge value of the first area 712 and the edge of the first surface 711 is L1. The extension dimension of the edge sealing portion 723 away from the main body 724 is L2, satisfying 0<L1≤L2. At least two battery cell groups 7 along the first direction X are located within the orthographic projections of the hard shell battery cells 71. The battery device 2 further includes a heat exchange mechanism 83, which extends along the first direction X between two battery cell groups 7 adjacent to each other in the second direction Y. The edge seal 723 includes a first edge seal 7231 and a second edge seal 7232. The first edge seal 7231 extends from both ends of the main body 724 in the second direction Y, and the second edge seal 7232 extends from one end of the main body 724 in the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other. The hard shell battery cell 71 includes a pressure relief mechanism 713, which is arranged on one side end surface of the hard shell battery cell 71 in the third direction Z away from the second edge seal 7232. The dimensions of the pressure relief mechanism 713 to the two first sealing edges 7231 in the second direction Y are the same. The battery device 2 further includes a first confluence component 81 and a second confluence component 82. The first confluence component 81 is connected to the hard-shell battery cell 71, and the second confluence component 82 is connected to the soft-pack battery cell 72. The first confluence component 81 is arranged on one side of the battery cell group 7 in the second direction Y, and the second confluence component 82 is arranged on one side of the battery cell group 7 in the third direction Z, or the first confluence component 81 and the second confluence component 82 are respectively arranged on both sides of the battery cell group 7 in the second direction Y or the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0154] In these embodiments, the battery device 2 includes a box body 202 and a battery cell group 7, the battery cell group 7 is accommodated in the box body 202, the battery cell group 7 includes a hard shell battery cell 71 and at least two soft-pack battery cells 72, the soft-pack battery cell 72 includes a first shell 721 and a first electrode assembly 722, the first shell 721 includes a main body 724 and a sealing edge 723 extending from the main body 724, the first electrode assembly 722 is arranged in the main body 724, and the hard shell battery cell 71 is arranged between two soft-pack battery cells adjacent to each other in the first direction X. The hard-shell battery cell 71 is provided between the two adjacent soft-pack battery cells 72, and the orthographic projection of the edge sealing portion 723 in the first direction X at least partially overlaps with the orthographic projection of the adjacent hard-shell battery cell 71 in the first direction X, so that at least part of the edge sealing portions 723 of two adjacent soft-pack battery cells 72 in the first direction X are separated by the hard-shell battery cell 71, so as to reduce the risk of high-temperature ejecta damaging the edge sealing portions 723 of adjacent soft-pack battery cells 72 when the soft-pack battery cells 72 are thermally runaway, resulting in damage to the adjacent soft-pack battery cells 72, causing the risk of thermal runaway spreading in the box body 202, thereby improving the reliability of the battery device 2.

[0155] 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 contained in the box, the battery cell group includes a hard-shell battery cell and at least two soft-pack battery cells, the hard-shell battery cell is arranged between two adjacent soft-pack battery cells in a first direction, The soft-pack battery cell comprises a first shell and a first electrode assembly, the first shell comprises a main body and a sealing edge extending from the main body, the first electrode assembly is arranged in the main body, and the orthographic projection of the sealing edge in the first direction at least partially overlaps with the orthographic projection of the adjacent hard-shell battery cell in the first direction.

2. The battery device according to claim 1, characterized in that: The edge sealing portion includes a first edge sealing portion and a second edge sealing portion, wherein the first edge sealing portion extends from two ends of the main body portion in a second direction, and the second edge sealing portion extends from one end of the main body portion in a third direction, and the first direction, the second direction and the third direction intersect each other. The hard shell battery cell comprises a pressure relief mechanism, and the pressure relief mechanism is arranged on an end surface of the hard shell battery cell in the third direction away from the second edge seal.

3. The battery device according to claim 2, characterized in that: The dimensions of the pressure relief mechanism in the second direction to the two first sealed edges are the same.

4. The battery device according to claim 1, characterized in that: The battery device further includes a first busbar and a second busbar, wherein the first busbar is connected to the hard-shell battery cell, and the second busbar is connected to the soft-pack battery cell.

5. The battery device according to claim 4, characterized in that: The first busbar component is arranged on one side of the battery cell group in the second direction, the second busbar component is arranged on one side of the battery cell group in the third direction, or the first busbar component and the second busbar component are arranged on both sides of the battery cell group in the second direction or the third direction, and the first direction, the second direction and the third direction intersect each other.

6. The battery device according to claim 1, characterized in that: The edge sealing portion is disposed around the main body, and the orthographic projections of the edge sealing portion on the peripheral side of the main body along the first direction are all located within the orthographic projections of the hard shell battery cell along the first direction.

7. The battery device according to claim 6, characterized in that: The hard shell battery cell includes a first surface arranged opposite to each other along the first direction, the first surface includes a first area, the orthographic projection of the main body along the first direction adjacent to the hard shell battery cell is located within the first area, the distance between the edge value of the first area and the edge of the first surface is L1, and the extension dimension of the edge sealing portion away from the main body is L2, satisfying 0<L1≤L2.

8. The battery device according to claim 1, characterized in that: At least two battery cell groups are spaced apart along a second direction. The battery device further comprises a heat exchange mechanism extending along the first direction between two battery cell groups adjacent to each other in the second direction. The first direction and the second direction intersect.

9. The battery device according to any one of claims 1 to 8, characterized in that: At least two battery cell groups are arranged at intervals along the second direction, and the orthographic projection of the soft-pack battery cells in one battery cell group in the second direction at least partially overlaps with the orthographic projection of the hard-shell battery cells in the adjacent battery cell group in the second direction.

10. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 9.

Images