Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body and a battery cell group. The box body forms a containing space. The battery cell group is located in the containing space. The battery cell group comprises at least two battery modules connected in series. The battery module comprises at least two battery cells connected in parallel. The battery cell comprises two first surfaces arranged oppositely along a first direction, two second surfaces arranged oppositely along a second direction and two third surfaces arranged oppositely along a third direction. The area of the first surface is larger than that of the second surface, and the area of the first surface is larger than that of the third surface. The at least two battery modules are arranged in sequence along the first direction. The at least two battery cells in the same battery module are arranged along a direction perpendicular to the first direction.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, people's requirements for the reliability of battery devices are also increasing. How to improve the reliability of battery devices is receiving more and more attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device, the battery device having good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery device, which includes a housing and a battery cell assembly, the housing forming a receiving space; the battery cell assembly is located in the receiving space, the battery cell assembly including at least two battery modules connected in series, and the battery modules including at least two battery cells connected in parallel; each battery cell includes two first surfaces arranged opposite each other along a first direction, two second surfaces arranged opposite each other along a second direction, and two third surfaces arranged opposite each other along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other, the area of ​​the first surface being larger than the area of ​​the second surface, and the area of ​​the first surface being larger than the area of ​​the third surface; at least two battery modules are arranged sequentially along the first direction, and at least two battery cells in the same battery module... The battery cells are arranged in a direction perpendicular to the first direction; each battery cell includes an electrode terminal disposed on the third surface, and at least two battery cells in the same battery module are arranged in the second direction; the battery module includes two battery cells, and the electrode terminals include a first terminal and a second terminal with opposite polarities, the first terminal and the second terminal being spaced apart along the second direction, and adjacent electrode terminals of two battery cells in the same battery module being either the first terminal or the second terminal; a first busbar connects adjacent electrode terminals of two battery cells in one battery module and connects to adjacent electrode terminals of two battery cells in an adjacent battery module.

[0006] The battery device has at least two battery modules connected in series and two battery cells in the battery modules connected in parallel. This allows the battery cell in the same battery module to continue to maintain its original voltage level and electrical conduction path after a single battery cell fails. The battery device can continue to operate with reduced power, thus improving the fault tolerance of the battery device. In the above structure, since the two battery cells in the same battery module are arranged in a direction perpendicular to the direction of the battery cell's largest surface area (first surface) (second direction), when one battery cell in the battery module experiences thermal runaway, although it will cause the other battery cell in the same battery module to discharge abnormally, the amount of heat transferred to the other battery cell in the same battery module through the second surface is relatively small, which makes it less likely to cause thermal runaway in the other battery cell in the same battery module. This reduces the possibility of thermal runaway propagating in the same battery module and is beneficial to improving the reliability of the battery device. The first busbar connects the adjacent electrode terminals of two battery cells in one battery module and the adjacent electrode terminals of two battery cells in an adjacent battery module to achieve parallel connection of two battery cells in the battery module and series connection of two adjacent battery modules. Since the electrode terminals connected by the first busbar are relatively close, the size of the first busbar is small, which helps to reduce the complexity of the connecting harness or busbar and enables efficient electrical connection.

[0007] According to some embodiments of the present application, the area of ​​the third surface is larger than the area of ​​the second surface. By setting the area of ​​the second surface to be smaller than the area of ​​the third surface, less heat is transferred from the thermally runaway battery cell to adjacent battery cells in the same battery module through the second surface. This helps to further reduce the possibility of thermal runaway battery cells causing thermal runaway to adjacent battery cells in the same battery module.

[0008] According to some embodiments of the present application, the battery device includes a first connecting portion and a second connecting portion that are interconnected. The first connecting portion connects the adjacent first terminals of two battery cells in one battery module; the second connecting portion connects the adjacent second terminals of two battery cells in another battery module. Since the second connecting portion and the first connecting portion are interconnected, after the second connecting portion connects the adjacent second terminals of two battery cells in another battery module, the second connecting portion also connects these second terminals to the first terminals of battery cells in the adjacent battery module, thus realizing the connection between the first terminals of one of the two adjacent battery modules connected in parallel and the second terminals of the other connected in parallel.

[0009] According to some embodiments of the present application, the battery device includes a first connecting portion and a second connecting portion spaced apart along a first direction, and the first busbar further includes a third connecting portion connected between the first connecting portion and the second connecting portion.

[0010] According to some embodiments of the present application, the battery device further includes a first heat insulation member, which is sandwiched between two adjacent battery cells in the same battery module. By sandwiching the first heat insulation member between two adjacent battery cells in the same battery module, the heat from a thermally runaway battery cell is blocked from being transferred to adjacent battery cells in the same battery module. This reduces the amount of heat transferred between adjacent battery cells in the same battery module and decreases the possibility of thermal runaway propagating within the same battery module.

[0011] According to some embodiments of the present application, the battery device further includes a second heat insulation member sandwiched between two adjacent battery modules. By sandwiching the second heat insulation member between two adjacent battery modules, the second heat insulation member can block the transfer of heat between the two adjacent battery modules, making it difficult for the heat generated by a single battery cell in one battery module to be transferred to the battery cells in an adjacent battery module, thus helping to reduce the possibility of thermal runaway propagating to adjacent battery modules.

[0012] Secondly, some embodiments of this application provide an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0013] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects: Some embodiments of this application provide a battery device, which includes a housing and a battery cell assembly. The housing forms a receiving space. The battery cell assembly is located in the receiving space and includes at least two battery modules connected in series. Each battery module includes at least two battery cells connected in parallel. Each battery cell includes two first surfaces arranged opposite each other along a first direction, two second surfaces arranged opposite each other along a second direction, and two third surfaces arranged opposite each other along a third direction. The area of ​​the first surface is larger than the area of ​​the second surface, and the area of ​​the third surface is larger than the area of ​​the third surface. At least two battery modules are arranged sequentially along the first direction, and at least two battery cells in the same battery module are arranged in a direction perpendicular to the first direction.

[0014] The battery device has at least two battery modules connected in series and two battery cells in the battery modules connected in parallel. This allows the battery cell in the same battery module to continue to maintain its original voltage level and electrical conduction path after a single battery cell fails. The battery device can continue to operate with reduced power, thus improving its fault tolerance. In the above structure, since the two battery cells in the same battery module are arranged in a direction perpendicular to the direction of the battery cell's largest surface area (first surface) (second direction), when one battery cell in the battery module experiences thermal runaway, although it will cause the other battery cell in the same battery module to discharge abnormally, the amount of heat transferred to the other battery cell in the same battery module through the second surface is relatively small, which makes it less likely to cause thermal runaway in the other battery cell in the same battery module. This reduces the possibility of thermal runaway propagating in the same battery module and is beneficial to improving the reliability of the battery device. The first busbar connects the adjacent electrode terminals of two battery cells in one battery module and the adjacent electrode terminals of two battery cells in an adjacent battery module to achieve parallel connection of two battery cells in the battery module and series connection of two adjacent battery modules. Since the electrode terminals connected by the first busbar are relatively close, the size of the first busbar is small, which helps to reduce the complexity of the connecting harness or busbar and enables efficient electrical connection. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application; Figure 4 This is a top view of a battery module provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 6 This is a top view of the battery module and the busbar provided in some embodiments of this application after connection; Figure 7 This is a top view of the battery module and the busbar provided in some other embodiments of this application; Figure 8A top view of the battery module and the busbar provided in some embodiments of this application; Figure 9 This is a top view of a battery module provided for other embodiments of this application.

[0016] In the diagram: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 7. Battery cell; 71. First surface; 72. Second surface; 73. Third surface; 74. First terminal; 75. Second terminal; 70. Battery cell group; 701. Battery module; 8. First heat insulation component; 9. Second heat insulation component; 10. First busbar; 101. First connection part; 102. Second connection part; 103. Third connection part; 11. Second busbar; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0017] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0018] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0019] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0020] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0021] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0022] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the usage of battery devices is also constantly increasing.

[0024] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via busbars.

[0025] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0026] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0027] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0028] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0029] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a hybrid configuration.

[0030] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0031] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0032] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0033] With the rapid development of electrification in commercial vehicles, the demand for battery cell capacity is increasing. While large-capacity battery cells can be adapted to vehicles, they are difficult to reuse in other scenarios. In some cases, a solution is used to connect smaller-capacity battery cells in parallel to meet the large-capacity requirements.

[0034] To improve space utilization in battery packs, parallel battery cells are often stacked on top of each other along their thickness. If one parallel cell malfunctions, it not only causes abnormal discharge in its parallel neighbors, but also transfers a significant amount of heat to adjacent cells along its thickness. This means that adjacent cells, both experiencing abnormal discharge and being affected by the transferred heat, can experience rapid thermal runaway within the battery pack, jeopardizing its operation.

[0035] To improve the reliability of the battery device, some embodiments of this application provide a battery device including a housing and a battery cell assembly. The housing forms a receiving space. The battery cell assembly is located in the receiving space and includes at least two battery modules connected in series. Each battery module includes at least two battery cells connected in parallel. Each battery cell includes two first surfaces arranged opposite each other along a first direction, two second surfaces arranged opposite each other along a second direction, and two third surfaces arranged opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The area of ​​the first surface is larger than the area of ​​the second surface, and the area of ​​the third surface is larger than the area of ​​the third surface. At least two battery modules are arranged sequentially along the first direction, and at least two battery cells in the same battery module are arranged in a direction perpendicular to the first direction.

[0036] The battery device comprises at least two battery modules connected in series and at least two battery cells connected in parallel within each module. This allows the parallel-connected battery cells in the same module to maintain their original voltage level and electrical conduction path even if a single battery cell in the battery cell group fails. The battery device can then continue operating at reduced power, improving its fault tolerance. In this structure, since at least two battery cells in the same module are arranged perpendicular to the direction of the surface with the largest area (the first surface), when a battery cell in the module experiences thermal runaway, although the cells in the same module will discharge abnormally, the amount of heat transferred to adjacent battery cells in the same module through a surface perpendicular to the first surface (the second or third surface) is relatively small. This reduces the likelihood of thermal runaway propagating within the same battery module and improves the reliability of the battery device.

[0037] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0038] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0039] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0040] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application.

[0041] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0042] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0043] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0044] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and a battery cell assembly 70, which is housed within the housing 5. The battery cell assembly 70 may include multiple battery cells, and the battery elevator may be the smallest unit that makes up the battery.

[0045] The housing 5 is used to accommodate the battery cell pack 70, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a receiving space 5c for accommodating the battery cell pack 70. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0046] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0047] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0048] Some embodiments of this application provide a battery device, and reference continues... Figure 2 The battery device 2 includes a housing 5 and a battery cell pack 70, with the housing 5 forming a receiving space 5c; the battery cell pack 70 is located in the receiving space 5c, as shown in the reference. Figure 3 and Figure 4 The battery cell pack 70 includes at least two battery modules 701 connected in series, and each battery module 701 includes at least two battery cells 7 connected in parallel; Reference Figure 5 The battery cell 7 includes two first surfaces 71 arranged opposite each other along a first direction X, two second surfaces 72 arranged opposite each other along a second direction Y, and two third surfaces 73 arranged opposite each other along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The area of ​​the first surface 71 is larger than the area of ​​the second surface 72, and the area of ​​the first surface 71 is larger than the area of ​​the third surface 73. At least two battery modules 701 are arranged sequentially along the first direction X, and at least two battery cells 7 in the same battery module 701 are arranged in a direction perpendicular to the first direction X.

[0049] The enclosure can be a component that provides a housing space 5c, which is used to house components such as the battery cell pack 70, wiring harness, circuit board, and heat exchange device located inside the battery device 2, so that the enclosure 5 can provide protection for the battery cell pack 70, wiring harness, circuit board, heat exchange device, and other components.

[0050] The battery cell pack 70 can be an independent module formed by arranging multiple battery cells 7. The battery cell 7 can be a rechargeable battery cell, which is a battery cell that can be recharged after discharge to activate its active materials and continue to be used. The battery cell 7 can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc.

[0051] Battery module 701 can be a sub-unit within battery cell group 70. Battery cell group 70 includes at least two battery modules 701 connected in series. This means that the battery cell group 70 includes at least two battery modules 701 connected in series, and these at least two battery modules 701 connected in series can provide the required voltage level for the battery device 2. "At least two battery modules 701 connected in series" can mean two battery modules 701 connected in series, or it can mean two or more battery modules 701 connected in series.

[0052] Battery module 701 includes at least two battery cells 7 connected in parallel. This means that battery module 701 includes at least two battery cells 7, and these at least two battery cells 7 are connected in parallel. The at least two battery cells 7 connected in parallel can provide sufficient capacity for the battery device 2 to meet the requirements of high current and high capacity. "At least two battery cells 7 connected in parallel" can mean two battery modules 701 connected in parallel, or it can mean two or more battery modules 701 connected in parallel. Because the battery cells 7 in battery module 701 are connected in parallel, when one battery cell 7 experiences thermal runaway, it will trigger abnormal discharge of the other battery cells 7 in battery module 701.

[0053] The first surface 71 is the outer surface of the casing of the battery cell 7 in the first direction X, the second surface 72 is the outer surface of the casing of the battery cell 7 in the second direction Y, and the third surface 73 is the outer surface of the casing of the battery cell 7 in the third direction Z.

[0054] The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. By making the battery cell 7 include two first surfaces 71 arranged opposite each other along the first direction X, two second surfaces 72 arranged opposite each other along the second direction Y, and two third surfaces 73 arranged opposite each other along the third direction Z, with the second surfaces 72 and the third surfaces 73 connected between the two first surfaces 71, the battery cell 7 is made into a hexahedral structure, such as a prismatic battery cell 7, so that multiple battery cells 7 can be neatly arranged in the accommodating space 5c, which is beneficial to improving the space utilization rate of the accommodating space 5c.

[0055] By setting the area of ​​the first surface 71 to be larger than the area of ​​the second surface 72, and the area of ​​the first surface 71 to be larger than the area of ​​the third surface 73, the first surface 71 becomes the outermost surface with the largest area in the battery cell 7 casing. Since the first surface 71 is the outermost surface with the largest area in the battery cell 7, the largest portion of the heat transferred outward from the battery cell 7 is transferred outward through the first surface 71.

[0056] Since the two largest first surfaces 71 in the battery cell 7 are arranged along the first direction X, arranging at least two battery modules 701 sequentially along the first direction X allows the at least two battery modules 701 to be arranged along the thickness direction of the battery cell 7. By arranging at least two battery cells 7 in the same battery module 701 along a direction perpendicular to the first direction X, the at least two battery cells 7 in the same battery module 701 do not overlap in the first direction X, but are arranged in only one layer. This makes the adjacent surfaces of two adjacent battery cells 7 in the same battery module 701 the second surface 72 or the third surface 73, and the two adjacent battery cells 7 in the same battery module 701 transfer heat through the second surface 72 or the third surface 73. When a battery cell 7 experiences thermal runaway, although other battery cells 7 in the same battery module 701 will be affected and discharge abnormally, the heat transferred from the adjacent battery cells 7 in the same battery module 701 is relatively small because the heat exchanged with the thermally runaway battery cell 7 is smaller, making it less likely to cause thermal runaway in adjacent battery cells 7 in the same battery module 701.

[0057] In the above structure, at least two battery modules 701 in the battery device 2 are connected in series, and at least two battery cells 7 in the battery module 701 are connected in parallel. This allows the parallel battery cells 7 in the same battery module 701 to maintain their original voltage level and electrical conduction path after a single battery cell 7 in the battery cell group 70 fails. The battery device 2 can continue to operate with reduced power, thus improving its fault tolerance. Since at least two battery cells 7 in the same battery module 701 are arranged in a direction perpendicular to the arrangement direction of the surface with the largest area of ​​the battery cell 7 (first surface 71), when a battery cell 7 in the battery module 701 experiences thermal runaway, although the battery cell 7 in the same battery module 701 will discharge abnormally, the amount of heat transferred to adjacent battery cells 7 in the same battery module 701 through the surfaces perpendicular to the first surface 71 (second surface 72 and third surface 73) is relatively small. This makes it less likely for adjacent battery cells 7 in the same battery module 701 to experience thermal runaway, reducing the possibility of thermal runaway propagating within the same battery module 701 and improving the reliability of the battery device 2.

[0058] In some embodiments, continue to refer to Figure 5 Each battery cell 7 includes an electrode terminal disposed on a third surface 73, and at least two battery cells 7 in the same battery module 701 are arranged along the second direction Y.

[0059] The electrode terminals can be components in the battery cell 7 used for electrical connection with external electrical devices or charging devices, so that the battery cell 7 can be charged and discharged. The electrode terminals can be, but are not limited to, cylindrical structures, elliptical cylindrical structures, etc., and can be configured according to actual conditions by those skilled in the art.

[0060] The electrode terminals are disposed on the third surface 73, which means that the electrode terminals protrude outward from the third surface 73 of the battery cell 7, so that devices such as busbars electrically connected to the electrode terminals are disposed on the outer side of the third surface 73. By arranging at least two battery cells 7 in the same battery module 701 sequentially along the second direction Y, the electrode terminals are not located between two battery cells 7 in the battery module 701, and the electrode terminals do not easily affect the arrangement of the battery cells 7 in the battery module 701, so that adjacent battery cells 7 in the battery module 701 can be fitted together or arranged relatively closely along the second direction Y.

[0061] In some embodiments, the area of ​​the third surface 73 is greater than the area of ​​the second surface 72.

[0062] By setting the area of ​​the third surface 73 to be larger than the area of ​​the second surface 72, the second surface 72 becomes the outer surface with the smallest area among the outer surfaces of the battery cell 7. Since two adjacent battery cells 7 in the battery module 701 are arranged along the second direction Y, they transfer heat through the second surface 72. By setting the area of ​​the second surface 72 to be smaller than the area of ​​the third surface 73, less heat is transferred from the thermally runaway battery cell 7 to the adjacent battery cells 7 in the same battery module 701 through the second surface 72. This helps to further reduce the possibility of the thermally runaway battery cell 7 causing thermal runaway to cause thermal runaway in adjacent battery cells 7 in the same battery module 701.

[0063] In some embodiments, continue to refer to Figure 4 The battery module 701 includes two battery cells 7, and the electrode terminals include a first terminal 74 and a second terminal 75 with opposite polarities. The first terminal 74 and the second terminal 75 are spaced apart along the second direction Y. The adjacent electrode terminals of the two battery cells 7 in the same battery module 701 are either the first terminal 74 or the second terminal 75.

[0064] The electrode terminals include a first terminal 74 and a second terminal 75 with opposite polarities. This can mean that the electrode terminals include two first terminals 74 and second terminals 75 with opposite polarities.

[0065] The first terminal 74 and the second terminal 75 are spaced apart along the second direction Y. This means that the first terminal 74 and the second terminal 75 are arranged at intervals along the arrangement direction of the two battery cells 7 in the same battery module 701. By setting the number of battery cells 7 included in the battery module 701 to two, the two battery cells 7 can be rotated and adjusted so that the adjacent electrode terminals of the two battery cells 7 in the same battery module 701 are both the first terminal 74 or the second terminal 75. This allows the electrode terminals of the same polarity of the battery cells 7 in the same battery module 701 to be arranged closer together. When the battery cells 7 in the same battery module 701 are connected in parallel, the electrode terminals of the same polarity can be connected through a smaller busbar, which helps to reduce the complexity of the connecting harness or busbar and achieves efficient electrical connection.

[0066] In some embodiments, reference Figure 6 The battery device 2 also includes a first busbar 10, which connects the adjacent electrode terminals of two battery cells 7 in a battery module 701 and connects to the adjacent electrode terminals of two battery cells 7 in an adjacent battery module 701.

[0067] In this battery cell group 70, the two adjacent electrode terminals of two adjacent battery cells 7 in the same battery module 701 are electrode terminals of the same polarity. The first busbar 10 connects the two, enabling the parallel connection of two adjacent battery cells 7 in the same battery module 701. Similarly, the adjacent electrode terminals of two battery cells 7 in adjacent battery modules 701 are also electrode terminals of the same polarity. By connecting the first busbar 10 to the adjacent electrode terminals of two battery cells 7 in adjacent battery modules 701, not only can the adjacent battery cells 7 in adjacent battery modules 701 be connected in parallel, but the adjacent battery modules 701 can also be connected in series.

[0068] In some embodiments, reference Figure 7 The first busbar 10 includes a first connecting part 101 and a second connecting part 102 that are connected to each other. The first connecting part 101 connects the first terminals 74 of two adjacent battery cells 7 in a battery module 701; the second connecting part 102 connects the second terminals 75 of two adjacent battery cells 7 in another battery module 701.

[0069] The first connecting part 101 and the second connecting part 102 can be two interconnected structures in the first busbar 10. The first connecting part 101 is used to connect the adjacent first terminals 74 of two battery cells 7 in the same battery module 701, so that the two battery cells 7 in the battery module 701 can be connected in parallel.

[0070] The second connection portion 102 can be a structure in the first busbar 10 used to connect the electrode terminals of two adjacent battery modules 701. The second connection portion 102 connects the adjacent second terminals 75 of two battery cells 7 in another battery module 701, meaning that the second connection portion 102 enables the connection of the adjacent second terminals 75 of two battery cells 7 in another battery module 701, allowing the two battery cells 7 in the other battery module 701 to be connected in parallel. Since the second connection portion 102 and the first connection portion 101 are interconnected, after the second connection portion 102 connects the adjacent second terminals 75 of two battery cells 7 in another battery module 701, the second connection portion 102 also connects these second terminals 75 to the first terminals 74 of the battery cells 7 in the adjacent battery module 701, realizing the connection between the first terminal 74 of one of the two adjacent battery modules 701 connected in parallel and the second terminal 75 of the other connected in parallel.

[0071] In some embodiments, the first connecting portion 101 and the second connecting portion 102 are spaced apart along a first direction X, and the first busbar 10 further includes a third connecting portion 103, which is connected between the first connecting portion 101 and the second connecting portion 102.

[0072] The first connecting portion 101 and the second connecting portion 102 are spaced apart along the first direction X. This means that the first connecting portion 101 corresponds to one of two adjacent battery modules 701, and the second connecting portion 102 corresponds to the other of the two adjacent battery modules 701. The first connecting portion 101 extends along the second direction Y, and the second connecting portion 102 extends along the second direction Y, with the first connecting portion 101 and the second connecting portion 102 spaced apart relative to each other in the first direction X. The third connecting portion 103 can be a structure in the first busbar 10 that connects the first connecting portion 101 and the second connecting portion 102. The first connecting portion 101 can connect adjacent first terminals 74 of two battery cells 7 arranged along the second direction Y in a battery module 701; the second connecting portion 102 can connect adjacent second terminals 75 of two battery cells 7 arranged along the second direction Y in adjacent battery modules 701.

[0073] In another embodiment, reference Figure 8The first connecting portion 101 extends along the second direction Y, so that the first connecting portion 101 can connect adjacent first terminals 74 of two battery cells 7 arranged along the second direction Y in a battery module 701; two second connecting portions 102 are provided, the two second connecting portions 102 are spaced apart along the second direction Y, the second connecting portions 102 extend along the first direction X and are connected to the first connecting portion 101, one of the two second connecting portions 102 is connected to the first terminal 74 of one battery cell 7 in an adjacent battery module 701, and the other of the two second connecting portions 102 is connected to the first terminal 74 of another battery cell 7 in an adjacent battery module 701.

[0074] In some embodiments, the battery device 2 further includes a second busbar 11, through which a first terminal 74 of one of two adjacent battery modules 701 is connected to a second terminal 75 of the other battery module 701. Exemplarily, the second busbar 11 extends along a first direction X, such that electrode terminals of two adjacent battery modules 701 with opposite polarities are connected through the second busbar 11, thereby connecting the two adjacent battery modules 701 in series.

[0075] In some embodiments, reference Figure 9 The battery device 2 also includes a first heat insulation element 8, which is sandwiched between two adjacent battery cells 7 in the same battery module 701.

[0076] The first heat insulation element 8 can be a structure used to block heat transfer between two adjacent battery cells 7 in the same battery module 701. By sandwiching the first heat insulation element 8 between two adjacent battery cells 7 in the same battery module 701, the heat from the thermally runaway battery cell 7 is blocked by the first heat insulation element 8 when it transfers to the adjacent battery cells 7 in the same battery module 701, thereby reducing the amount of heat transferred to the adjacent battery cells 7 in the same battery module 701 and reducing the possibility of thermal runaway propagating in the same battery module 701.

[0077] For example, the first heat insulation element 8 may be made of flame-retardant polyurethane foam, organic elastic flame-retardant foam, silica aerogel composite felt, mica composite tape or ceramic fiber felt.

[0078] In some embodiments, the battery device 2 further includes a second heat insulation member 9, which is sandwiched between two adjacent battery modules 701.

[0079] The second heat insulation element 9 can be a structure used to mitigate heat transfer between two adjacent battery modules 701. By sandwiching the second heat insulation element 9 between two adjacent battery modules 701, the second heat insulation element 9 can block the transfer of heat between the two adjacent battery modules 701, making it difficult for the heat generated by the battery cell 7 in one battery module 701 to be transferred to the battery cell 7 in the adjacent battery module 701, thus helping to reduce the possibility of thermal runaway propagating to the adjacent battery module 701.

[0080] Some embodiments of this application also provide an electrical device, which includes a battery device 2 provided by any of the above technical solutions, the battery device 2 being used to provide electrical energy.

[0081] Some embodiments of this application provide a battery device 2, which includes a housing 5, a first busbar 10, a second busbar 11, a first heat insulation member 8 and a second heat insulation member 9, and a battery cell assembly 70. The housing 5 forms an accommodating space 5c. The battery cell assembly 70 is located in the accommodating space 5c and includes a plurality of battery modules 701 connected in series. Each battery module 701 includes two battery cells 7 connected in parallel. Each battery cell 7 includes two first surfaces 71 arranged opposite each other along a first direction X, two second surfaces 72 arranged opposite each other along a second direction Y, and two third surfaces 73 arranged opposite each other along a third direction Z. The area of ​​the first surface 71 is larger than the area of ​​the third surface 73, and the area of ​​the third surface 73 is larger than the area of ​​the second surface 72. A first terminal 74 and a second terminal 75 are arranged at intervals opposite each other on the third surface 73 along the second direction Y. The plurality of battery modules 701 are arranged sequentially along the first direction X, and the two battery cells 7 in the same battery module 701 are arranged along the second direction Y. The first busbar 10 connects the first terminals 74 of two adjacent battery cells 7 in a battery module 701, and connects them to the second terminals 75 of two adjacent battery cells 7 in an adjacent battery module 701. The first terminal 74 of one battery module 701 is connected to the second terminal 75 of the other battery module 701 via the second busbar 11. A first heat insulation member 8 is sandwiched between two adjacent battery cells 7 in the same battery module 701. A second heat insulation member 9 is sandwiched between two adjacent battery modules 701.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box-like structure forms a storage space; A battery cell assembly is located in the accommodating space. The battery cell assembly includes at least two battery modules connected in series, and each battery module includes two battery cells connected in parallel. Each battery cell includes two first surfaces arranged opposite each other along a first direction, two second surfaces arranged opposite each other along a second direction, and two third surfaces arranged opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface. At least two battery modules are arranged sequentially along the first direction, and two battery cells in the same battery module are arranged along the second direction; each battery cell includes an electrode terminal, the electrode terminal is disposed on the third surface, the electrode terminal includes a first terminal and a second terminal with opposite polarities, the first terminal and the second terminal are spaced apart along the second direction, and the adjacent electrode terminals of two battery cells in the same battery module are both the first terminal or the second terminal; The first busbar connects the adjacent electrode terminals of two battery cells in one battery module and connects to the adjacent electrode terminals of two battery cells in an adjacent battery module.

2. The battery device according to claim 1, characterized in that, The area of ​​the third surface is greater than the area of ​​the second surface.

3. The battery device according to claim 1, characterized in that, The first busbar includes a first connecting part and a second connecting part that are connected to each other. The first connecting part connects the first terminals of two adjacent battery cells in one battery module; the second connecting part connects the second terminals of two adjacent battery cells in another battery module.

4. The battery device according to claim 3, characterized in that, The first connecting portion and the second connecting portion are spaced apart along the first direction, and the first busbar further includes a third connecting portion, which is connected between the first connecting portion and the second connecting portion.

5. The battery device according to claim 1, characterized in that, The battery device further includes a first heat insulation component, which is sandwiched between two adjacent battery cells in the same battery module.

6. The battery device according to claim 1, characterized in that, The battery device also includes a second heat insulation component, which is sandwiched between two adjacent battery modules.

7. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1-6, the battery device being used to provide electrical energy.

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