Battery device, battery cell, electric device, and vehicle

Abstract

The application is suitable for the technical field of batteries, and provides a battery device, a battery monomer, a power utilization device and a vehicle. The battery device comprises: a box body; at least two battery monomers arranged in the box body along a first direction; the battery monomer comprises a shell and two electrode terminals arranged on the shell, the shell comprises two first surfaces arranged at intervals along the first direction, the electrode terminal comprises a first part arranged on the first surface, and the first parts of the two electrode terminals are arranged on the two first surfaces respectively; the first parts of two adjacent battery monomers are directly connected, and the polarities of the two electrode terminals connected are different. In the battery device provided by the application, the electrode terminals are arranged on the two sides of the battery monomer, so that the electrode terminals of two adjacent battery monomers are directly connected, the two electrode terminals are directly connected without additionally arranging a tab or other electrical connection structure, space is saved, space utilization is improved, and the energy density of the battery device is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In current battery devices, the electrode terminals of each battery cell are connected by a plate or other electrical connection structure. Gaps are required between adjacent plates, between the plate and the battery cell casing, and between the plate and the housing. This results in low space utilization at the plate location, which in turn negatively impacts the energy density of the battery device. Utility Model Content

[0004] In view of the above problems, this application provides a battery device, a battery cell, an electrical device, and a vehicle that can mitigate the negative impact of the electrical connection structure between electrode terminals on the energy density of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, comprising:

[0006] The enclosure includes at least two battery cells arranged in a first direction within the enclosure. Each battery cell includes a housing and two electrode terminals disposed on the housing. The housing includes two first surfaces spaced apart in the first direction. Each electrode terminal includes a first portion disposed on one of the first surfaces, and the first portions of the two electrode terminals are respectively disposed on the two first surfaces. The first portions of two adjacent battery cells in the first direction are directly connected, and the polarities of the two connected electrode terminals are different.

[0007] In this embodiment, the electrode terminals are arranged on both sides of the battery cell so that the electrode terminals of two adjacent battery cells can be directly connected without the need for additional tabs or other electrical connection structures, thus saving space. At the same time, the electrode terminals are arranged on the side, so that the shape of the upper part of each battery cell is more standardized and there is less narrow space that is difficult to use, which facilitates the arrangement of other structures or direct connection with the casing, improving space utilization and making it easier to increase the energy density of the battery device.

[0008] In some embodiments, in a first direction, the orthographic projection of the first part is within the first surface.

[0009] In the technical solution of this embodiment, the projection of the first part is within the first surface, so that the first part is difficult to extend beyond the first surface, thereby making it difficult for the first part to contact other structures other than the corresponding battery cell, reducing the risk of electrode terminal short circuit and battery cell short circuit.

[0010] In some embodiments, the size of the first part in the first direction ranges from 0.5 mm to 3 mm.

[0011] The technical solution of this embodiment provides a range of sizes for the first part, which enables the first parts of two adjacent battery cells to be stably connected, reduces the gap between adjacent battery cells, improves space utilization, and increases the energy density of the battery device.

[0012] In some embodiments, in a second direction perpendicular to the first direction, the size of the first part is less than or equal to the size of the housing.

[0013] In the technical solution of this embodiment, the size of the first part in the second direction is less than or equal to the size of the housing. When it is difficult for the first part to extend outside the housing, this arrangement makes the flow area between the two connected first parts larger, thereby reducing power loss and improving power transmission efficiency.

[0014] In some embodiments, the battery device further includes a first connection structure connected to the edges of two connected first portions, the first connection structure extending along a second direction.

[0015] In the technical solution of this embodiment, a first connecting structure is provided to connect two first parts, and the first connecting structure extends along a second direction so that the first connecting structure can connect the two first parts more stably and improve the connection stability of the two connected first parts.

[0016] In some embodiments, in a first direction, the orthographic projection of the first part overlaps with the first surface.

[0017] In the technical solution of this embodiment, the first part can have a larger flow area, thereby better reducing power loss and improving power transmission efficiency.

[0018] In some embodiments, the battery device further includes a second connection structure connected to the edges of the two connected first portions, and the second connection structure is disposed around the periphery of the two connected first portions.

[0019] In the technical solution of this embodiment, a second connecting structure is provided to connect the two first parts and to surround the first parts, so as to further improve the connection stability between the two first parts.

[0020] In some embodiments, the housing further includes two second surfaces spaced apart along a second direction, the two first surfaces and the two second surfaces being connected end to end alternately along the periphery of the housing, the second direction being perpendicular to the first direction; the area of ​​the first surface is greater than the area of ​​the second surface; or the area of ​​the first surface is less than the area of ​​the second surface.

[0021] In the technical solution of this embodiment, the first part can be located on the side with a larger area of ​​the housing or on the side with a smaller area of ​​the housing, which improves the adaptability of the battery cell and enables the battery cell to be adapted to different operating conditions of the housing, battery device, etc.

[0022] In some embodiments, a plurality of battery cells are further arranged along a second direction, which is perpendicular to the first direction. Each battery cell located in the first direction forms a battery cell assembly, and the plurality of battery cell assemblies are arranged along the second direction. The battery cell assembly has end battery cells located at both ends along the first direction, and the first portions of the end battery cells of two adjacent battery cell assemblies along the second direction are connected by an electrical connection structure.

[0023] In the technical solution of this embodiment, battery cells are arranged along a first direction and a second direction, and battery cells are arranged along the first direction to form a battery cell assembly. Different battery cell assemblies are connected by setting an electrical connection structure to connect the battery cell assemblies into one unit, which facilitates the transmission of electrical energy.

[0024] In some embodiments, the housing includes a frame structure having a receiving space extending along a third direction, in which a battery cell is received, the third direction being perpendicular to the first direction; the housing also includes a cover plate connected to the frame structure and covering the receiving space.

[0025] The technical solution of this embodiment provides some specific structures of the housing so that the battery cells can be housed in the housing and the housing can provide protection for the battery cells.

[0026] In some embodiments, the cover is attached to the battery cell.

[0027] In this embodiment, the cover plate is connected to the battery cell so that the battery cell provides support for the cover plate, thereby improving the overall strength of the cover plate.

[0028] In some embodiments, the battery cell further includes a pressure relief structure connected to the housing, the pressure relief structure being located on the side of the housing facing the cover plate.

[0029] In the technical solution of this embodiment, the pressure relief structure is located on the side of the housing facing the cover plate. In the event of thermal runaway of a battery cell, this setting can reduce the risk of the flue gas generated by thermal runaway directly impacting other battery cells, thereby reducing the negative impact that thermal runaway of a certain battery cell may have on other adjacent battery cells.

[0030] In some embodiments, the electrode terminal further includes a second part connected to the first part, the second part being connected to the housing, and the second part being located on one side of the housing along a third direction, the third direction being perpendicular to the first direction.

[0031] In the technical solution of this embodiment, the electrode terminal also includes a second part, and the first part and the second part are located on different sides of the casing, so that the battery cell can be adapted to existing processing equipment and production lines, which facilitates processing and reduces production difficulty and cost.

[0032] In some embodiments, the size of the second part ranges from 0.5 mm to 3 mm in the third-party direction.

[0033] The technical solution of this embodiment provides a range of sizes for the second part, which enables the second part to be stably connected to the housing, reduces the space occupied by the second part, improves space utilization, and increases the energy density of the battery device.

[0034] Secondly, embodiments of this application also provide a battery cell applied to the battery device provided in some embodiments of the first aspect. The battery cell includes a housing and electrode terminals connected to the housing. The housing includes two first surfaces arranged at intervals along a first direction. The housing also includes two opposing and spaced third surfaces, with the third surfaces connected to the first surfaces. The electrode terminals include a first part and a second part connected to the first part. The first part is connected to the first surface, and the second part is connected to the third surface.

[0035] In this embodiment, the electrode terminals include a first part and a second part, and the first part and the second part are located on different sides of the housing, so that the first parts of each battery cell can be directly connected and the space occupied by the battery cell can be reduced. At the same time, the battery cell can also be adapted to existing processing equipment and production lines, making it easier to process and reducing production difficulty and cost.

[0036] Thirdly, embodiments of this application also provide an electrical device, including the battery device provided in some embodiments of the first aspect.

[0037] Fourthly, embodiments of this application also provide a vehicle including a battery device provided in some embodiments of the first aspect, the battery device being used as at least a portion of the vehicle's floor structure.

[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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:

[0040] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0041] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0042] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0043] Figure 4 A perspective view of a battery device with the cover removed, provided in some embodiments of this application;

[0044] Figure 5 A perspective view of a battery cell provided in some embodiments of this application;

[0045] Figure 6 This is a front view schematic diagram of a battery cell provided in some embodiments of this application;

[0046] Figure 7 A side view schematic diagram of a battery cell provided in some embodiments of this application;

[0047] Figure 8 A side view schematic diagram of a battery cell provided for other embodiments of this application;

[0048] Figure 9 This is a front view schematic diagram of a battery cell provided in some other embodiments of this application;

[0049] Figure 10 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0050] Figure 11 for Figure 10 A magnified view of a portion of point B in the middle;

[0051] Figure 12 for Figure 4A magnified view of a portion of point A in the middle.

[0052] The markings in the diagram mean:

[0053] 1000, vehicles;

[0054] 100. Battery device;

[0055] 10. Box body; 11. Frame structure; 111. Accommodation space; 12. Cover plate;

[0056] 20. Battery cell assembly; 21. Battery cell; 21a. End battery cell; 211. Housing; 2111. First side; 2112. Second side; 2113. Third side; 212. Electrode assembly; 213. Electrode terminal; 2131. First part; 2132. Second part; 214. Pressure relief structure;

[0057] 30. First connection structure;

[0058] 40. Electrical connection structure;

[0059] 200. Motor;

[0060] 300. Controller. Detailed Implementation

[0061] 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.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] 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," and "circumferential" 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 are not intended to 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.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0069] 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 applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0070] In current battery devices, the electrode terminals of individual battery cells are located at the top of the cells. The electrode terminals of each cell are connected by a tab or other electrical connection structure. Gaps are required between adjacent tabs, between the tab and the cell casing, and between the tab and the housing. However, these gaps are usually small and irregularly shaped, meaning they are difficult to utilize. This results in low space utilization at the tabs in the battery device, which in turn negatively impacts the energy density of the battery device.

[0071] Meanwhile, during the charging and discharging process of the battery device, the battery cells will undergo periodic expansion and contraction. This expansion and contraction can easily lead to a decrease in the connection stability between the battery and the electrode terminals, and can easily cause the battery to deform, which in turn can easily lead to problems such as battery short circuit, arcing, and welding failure.

[0072] Based on the above considerations, in order to mitigate the negative impact of the electrical connection structure between electrode terminals on the energy density of the battery device, this application provides a battery device in which battery cells are arranged along a first direction and the housing of the battery cells includes two first surfaces arranged along the first direction; the electrode terminals of the battery cells include first portions and the two first portions are respectively connected to the two first surfaces, while the first portions of two adjacent battery cells are directly connected.

[0073] In such a battery device, the electrode terminals of two adjacent battery cells are directly connected, eliminating the need for additional tabs or other electrical connection structures, thus saving space. At the same time, by placing the electrode terminals on the side, the upper part of each battery cell has a more standardized shape, reducing the amount of narrow space that is difficult to utilize. This facilitates the installation of other structures or direct connection to the housing, improving space utilization and increasing the energy density of the battery device. Furthermore, since the electrode terminals do not need to be connected to each other via tabs or other electrical connection structures, the risk of unstable connections, short circuits, and arcing is reduced.

[0074] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0076] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0077] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include a plurality of battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0079] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0080] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0081] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed in the housing 10.

[0082] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0083] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0084] As an example, the housing 10 may include a first housing 10 and a second housing 10. The first housing 10 and the second housing 10 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 10 may be a top cover or a bottom plate.

[0085] As an example, the housing 10 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 the interior of the housing 10 forms an enclosed space to house the battery cell assembly 20.

[0086] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0087] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application. A battery cell 21 refers to the smallest unit that makes up a battery. As shown, the battery cell 21 includes an end cap, a housing 211, an electrode assembly 212, and other functional components.

[0088] An end cap is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 21 from the external environment. The shape of the end cap can be adapted to the shape of the housing 211 to fit it. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 213 can be provided on the end cap. The electrode terminals 213 can be used to electrically connect to the electrode assembly 212 for outputting or inputting electrical energy into the battery cell 21. In some embodiments, the end cap can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The material of the end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap. The insulating element can be used to isolate the electrical connection components within the housing 211 from the end cap to reduce the risk of short circuits. Exemplarily, the insulating element may be made of plastic, rubber, etc.

[0089] The housing 211 is a component used to cooperate with the end cap to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 211 and the end cap can be independent components. An opening can be provided on the housing 211, and the end cap closes the opening to form the internal environment of the battery cell 21. Alternatively, the end cap and housing 211 can be integrated. Specifically, the end cap and housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 212. The material of the housing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic. This application embodiment does not impose any special limitations on this.

[0090] Electrode assembly 212 is the component in the battery cell 21 where electrochemical reactions occur. The casing 211 may contain one or more electrode assemblies 212. The electrode assembly 212 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 212, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 213 to form a current loop.

[0091] Firstly, reference Figures 4 to 7 This application provides a battery device 100, including a housing 10 and at least two battery cells 21. The at least two battery cells 21 are arranged within the housing 10 along a first direction. Each battery cell 21 includes a housing 211 and two electrode terminals 213 disposed on the housing 211. The housing 211 includes two first surfaces 2111 spaced apart along the first direction. Each electrode terminal 213 includes a first portion 2131 disposed on the first surface 2111, and the first portions 2131 of the two electrode terminals 213 are respectively disposed on the two first surfaces 2111. The first portions 2131 of two adjacent battery cells 21 along the first direction are directly connected, and the polarities of the two connected electrode terminals 213 are different.

[0092] In the figure, the X-axis is the length direction of the battery device 100, the Y-axis is the width direction of the battery device 100, and the Z-axis is the height direction of the battery device 100.

[0093] The housing 10 refers to the structure in the battery device 100 that provides a space 111 for housing the battery cells 21 and other structures. The housing 10 can be prismatic, cylindrical, or other shapes. The material of the housing 10 can include metal, plastic, or other materials.

[0094] Battery cell 21 refers to the smallest unit that makes up the battery device 100. Battery cell 21 can be a secondary battery cell 21 or a primary battery cell 21; battery cell 21 can be a lithium-sulfur battery cell 21, a sodium-ion battery cell 21 or a magnesium-ion battery cell 21; battery cell 21 can be cylindrical, flat, prismatic or other shapes.

[0095] The number of battery cells 21 is at least two, that is, the number of battery cells 21 can be two, three or more; at least two battery cells 21 are arranged along a first direction, which can be the length direction X of the battery device 100, the width direction Y of the battery device 100, or other directions; when at least two battery cells 21 are arranged along the first direction, other battery cells 21 can also be arranged along other directions. For example, the first direction is the length direction X of the battery device 100.

[0096] The battery cell 21 includes a housing 211 and electrode terminals 213 connected to the housing 211. The housing 211 refers to the structure used to form the internal environment of the battery cell 21. The internal environment formed by the housing 211 can be used to accommodate electrode components 212, electrolyte, or other components. The housing 211 can be prismatic, cylindrical, flat, or other shapes, and the shape of the housing 211 can also be set according to the shape of the battery cell 21. The material of the housing 211 can include metal, plastic, or other materials.

[0097] The housing 211 includes two first surfaces 2111 spaced apart along a first direction. Since the battery cells 21 are arranged along the first direction, the first surfaces 2111 are one of the sides of the housing 211. For example, when the housing 211 is cuboid, the two first surfaces 2111 are two oppositely arranged along the first direction on the peripheral side of the housing 211; for example, when the housing 211 is cylindrical, the two first surfaces 2111 may be a portion of the cylindrical side of the housing 211.

[0098] It is understandable that, in addition to the first surface 2111, the shell 211 may also include other surfaces.

[0099] Electrode terminal 213 refers to the structure in battery cell 21 used for electrical connection with external circuits or other battery cells 21. Battery cell 21 can input or output electrical energy through electrode terminal 213. There are two electrode terminals 213, and the two electrode terminals 213 have different polarities. The two electrode terminals 213 can typically be a positive terminal and a negative terminal. The shape of electrode terminal 213 can be prism-shaped, cylindrical, disc-shaped, square-shaped, or other shapes. One end of electrode terminal 213 extends into the housing 211 and is electrically connected to electrode assembly 212, and the other end of electrode terminal 213 extends outside the housing 211 to facilitate electrical connection with external circuits or other battery cell 21 electrode terminals 213.

[0100] The first part 2131 refers to a portion of the structure of the electrode terminal 213. The first part 2131 can be electrically connected to the electrode terminal 213 of an external circuit or another battery cell 21. The battery cell 21 may include only the first part 2131, or it may include other structures besides the first part 2131. The first part 2131 may be located only outside the housing 211, or it may extend partially into the housing 211. The two first parts 2131 are respectively located on the first surface 2111, that is, the two first parts 2131 are located on opposite sides of the housing 211 along the first direction.

[0101] Since the individual battery cells 21 are arranged along the first direction, the first parts 2131 of two adjacent battery cells 21 arranged along the first direction can be opposite each other. At this time, the two opposite first parts 2131 are directly connected to conduct electricity to the two corresponding battery cells 21; the two first parts 2131 can be connected by welding, bonding or other means.

[0102] When two adjacent first parts 2131 are directly connected, the electrical connection between battery cells 21 does not require the use of a plate or other intermediate structure, saving space and reducing space occupation, thereby improving the energy density of the battery device 100.

[0103] Meanwhile, when the first part 2131 is connected, there is no need to set a plate or other intermediate electrical connection structure 40 on the upper end of the battery cell 21. The upper part of the battery cell 21 can have a more regular and larger space, so as to set a cold plate or other structure, thereby improving the space utilization rate. The cover plate 12 of the box 10 can also be directly set on the upper part of the battery cell 21, thereby improving the energy density of the battery device 100.

[0104] In the battery device 100 with a battery plate, gaps are required between the battery plate and the housing 211, as well as between adjacent battery plates, to reduce the risk of short circuits. The spaces formed by these gaps are usually small and irregular in shape, making them difficult to utilize, thus wasting space and reducing space utilization.

[0105] Accordingly, in this embodiment, the electrode terminals 213 are arranged on both sides of the battery cell 21 so that the electrode terminals 213 of two adjacent battery cells 21 can be directly connected, so that two adjacent electrode terminals 213 can be directly connected without the need to set up additional tabs or other electrical connection structures 40, thus saving space. At the same time, the electrode terminals 213 are arranged on the side, so that the shape of the upper end of each battery cell 21 is more regular, and the narrow space that is difficult to use is smaller, which makes it easier to lay out other structures or directly connect to the housing 10, thereby improving the space utilization rate and facilitating the improvement of the energy density of the battery device 100.

[0106] refer to Figure 5 , Figure 7 In some embodiments, in the first direction, the orthographic projection of the first part 2131 is within the first surface 2111.

[0107] The projection of the first part 2131 in the first direction is within the first surface 2111, that is, the first part 2131 is difficult to extend beyond the first surface 2111; when the battery cells 21 are arranged along the first direction, this arrangement enables the first part 2131 to be located between two adjacent housings 211, and it is difficult to contact other structures, thereby reducing the risk of the first part 2131 contacting other structures and reducing the risk of short circuit of the electrode terminals 213.

[0108] In this embodiment, the projection of the first part 2131 is within the first surface 2111, so that the first part 2131 is difficult to extend beyond the first surface 2111, thereby making it difficult for the first part 2131 to contact other structures other than the corresponding battery cell 21, reducing the risk of short circuit of electrode terminal 213 and battery cell 21.

[0109] refer to Figure 6 In some embodiments, the size of the first part 2131 in the first direction ranges from 0.5 mm to 3 mm.

[0110] The dimension of the first part 2131 in the first direction is the height of the first part 2131 protruding from the first surface 2111, which is the dimension shown in L1 in the figure. Since the first parts 2131 of two adjacent battery cells 21 along the first direction are directly connected, the dimension of the first part 2131 in the first direction is positively correlated with the gap between the two adjacent battery cells 21 along the first direction. The larger the dimension, the larger the gap between the two adjacent battery cells 21, and the lower the energy density of the battery device 100.

[0111] Meanwhile, the larger the size of the first part 2131 in the first direction, the easier it is to connect the first parts 2131 of two adjacent battery cells 21. For example, when the two first parts 2131 are connected by welding, the larger the size of the first part 2131 in the first direction, the larger the size of the solder mark in the first direction, the higher the connection strength, the better the stability, and the less likely it is to damage the adjacent battery cells 21 during the welding process. For example, when the two first parts 2131 are connected by adhesive, the larger the size of the first part 2131 in the first direction, the larger the gap between the two battery cells 21, the easier it is to apply adhesive, and the less likely the adhesive is to flow to the adjacent battery cells 21.

[0112] Accordingly, the size of the first part 2131 in the first direction is in the range of 0.5mm to 3mm, so that two first parts 2131 can be connected, while ensuring that the gap between the two battery cells 21 is not too large. For example, the size of the first part 2131 in the first direction can be 0.5mm, 1mm, 1.25mm, 1.5mm, 2mm, 2.5mm, 3mm or other values.

[0113] For example, the first part 2131 has a size of 0.5 mm in the first direction. At this time, the distance between two adjacent battery cells 21 along the first direction is 1 mm. The distance between the two battery cells 21 is small, the space utilization of the battery device 100 is high, and the energy density of the battery device 100 is large.

[0114] For example, the first part 2131 has a size of 1.25 mm in the first direction. At this time, the distance between two adjacent battery cells 21 along the first direction is 2.5 mm. The distance between the two battery cells 21 is moderate, which can not only make the two first parts 2131 connected relatively stably, but also improve the energy density of the battery device 100.

[0115] For example, the first part 2131 has a size of 3mm in the first direction, and the distance between two adjacent battery cells 21 along the first direction is 6mm. The two first parts 2131 can be connected more stably, and the connection part of the two first parts 2131 can have high strength.

[0116] This embodiment provides a range of sizes for the first part 2131, which enables the first parts 2131 of two adjacent battery cells 21 to be stably connected, reduces the gap between adjacent battery cells 21, improves space utilization, and increases the energy density of the battery device 100.

[0117] refer to Figures 7 to 9 In some embodiments, in a second direction perpendicular to the first direction, the size of the first part 2131 is less than or equal to the size of the housing 211.

[0118] The second direction is perpendicular to the first direction. When the first direction is the length direction X of the battery device 100, the second direction can be the width direction Y of the battery device 100 or the height direction Z of the battery device 100.

[0119] refer to Figure 8 When the second direction is the width direction Y of the battery device 100, the size of the first part 2131 is less than or equal to the size of the housing 211. That is, the size of the first part 2131 in the width direction of the housing 211 can be less than or equal to the size of the housing 211. For example, the size of the first part 2131 in the width direction of the housing 211 is equal to the size of the housing 211. The connection size of the two connected first parts 2131 in the second direction is larger, which facilitates connection and improves connection strength. At the same time, this arrangement can also increase the flow area between the two connected first parts 2131, thereby reducing the power loss between the two first parts 2131 and improving the power transmission efficiency.

[0120] For example, when the battery cell 21 is a square-shell battery cell 21, the connection between the first surface 2111 and the adjacent other surface is a rounded corner structure. In this case, the first part 2131 can extend to the rounded corner structure and correspond to part of the rounded corner structure. Alternatively, the first part 2131 can be set off from the rounded corner structure.

[0121] refer to Figure 9 When the second direction is the height direction Z of the battery device 100, the size of the first part 2131 is less than or equal to the size of the housing 211. That is, the size of the first part 2131 in the height direction of the housing 211 can be less than or equal to the size of the housing 211. For example, the size of the first part 2131 in the height direction of the housing 211 is equal to the size of the housing 211. The two connected first parts 2131 have a larger contact area to increase the flow area between the two connected first parts 2131, thereby reducing the power loss between the two first parts 2131 and improving the power transmission efficiency.

[0122] In this embodiment, the size of the first part 2131 in the second direction is smaller than or equal to the size of the housing 211. When the first part 2131 is difficult to extend beyond the housing 211, this arrangement makes the flow area between the two connected first parts 2131 larger, thereby reducing power loss and improving power transmission efficiency.

[0123] refer to Figure 10 , Figure 11In some embodiments, the battery device 100 further includes a first connection structure 30, which is connected to the edges of two connected first portions 2131 and extends along a second direction.

[0124] The first connection structure 30 refers to the structure in the battery device 100 used to connect two connected first parts 2131. Depending on the connection method of the two first parts 2131, the first connection structure 30 can be a weld mark formed by welding, or an adhesive layer structure formed by bonding. Depending on the connection method of the two first parts 2131, the first connection structure 30 can also be other structures. For example, the first connection structure 30 is a weld mark formed by welding.

[0125] Since the surfaces of the two first parts 2131 that come into contact with each other are mainly used for conducting electrical energy, and the first connecting structure 30 is difficult to set between the two first parts 2131 after the two first parts 2131 abut against each other; accordingly, the first connecting structure 30 is set at the edge of the two connected first parts 2131 so as to better connect the two first parts 2131 through the first connecting structure 30, and at the same time, it can also reduce the negative impact that the first connecting structure 30 may have on the conduction of electrical energy between the two first parts 2131.

[0126] During the connection of the two first parts 2131, the two first parts 2131 abut against each other, and then the first connection structure 30 is formed on the two first parts 2131 and extends along the second direction to connect the two first parts 2131 and enable electrical energy to be conducted through the two first parts 2131.

[0127] The dimension of the first connecting structure 30 in the second direction can be equal to the dimension of the first part 2131 in the second direction to improve the connection strength of the first connecting structure 30 and the connection stability between the two first parts 2131; the dimension of the first connecting structure 30 in the second direction can also be smaller than the dimension of the first part 2131 in the second direction to reduce connection cost. For example, the dimension of the first connecting structure 30 in the second direction is equal to the dimension of the first part 2131 in the second direction.

[0128] When the dimension of the first part 2131 in the second direction is equal to the dimension of the housing 211 in the second direction, the dimension of the first part 2131 in the second direction is at its maximum. In this case, the dimension of the first connecting structure 30 in the second direction can be equal to the dimension of the first part 2131 in the second direction, allowing the first connecting structure 30 to more stably connect the two corresponding first parts 2131. For example, the dimension of the first part 2131 in the second direction is equal to the dimension of the housing 211 in the second direction, and the dimension of the first connecting structure 30 in the second direction is equal to the dimension of the first part 2131 in the second direction.

[0129] In this embodiment, a first connecting structure 30 is provided to connect two first parts 2131, and the first connecting structure 30 extends along the second direction so that the first connecting structure 30 can connect the two first parts 2131 relatively stably and improve the connection stability of the two connected first parts 2131.

[0130] refer to Figure 9 In some embodiments, in the first direction, the orthographic projection of the first part 2131 overlaps with the first surface 2111.

[0131] The orthographic projection of the first part 2131 in the first direction overlaps with the first surface 2111. That is, in the first direction, the orthographic projection area of ​​the first part 2131 is equal to the area of ​​the first surface 2111. At this time, the area of ​​the first part 2131 in the first direction is the largest. When the two first parts 2131 are connected, the contact area between the two connected first parts 2131 is the largest, and the current flow area between the two connected first parts 2131 is also the largest. This can reduce the power loss between the two first parts 2131 and improve the power transmission efficiency.

[0132] In this embodiment, the first part 2131 is made to have a larger flow area, thereby better reducing power loss and improving power transmission efficiency.

[0133] In some embodiments where the orthographic projection of the first part 2131 in the first direction overlaps with the first surface 2111, the battery device 100 further includes a second connecting structure connected to the edges of the two connected first parts 2131, and the second connecting structure is disposed around the periphery of the two connected first parts 2131.

[0134] The second connection structure refers to the structure in the battery device 100 used to connect two connected first parts 2131. Depending on the connection method of the two first parts 2131, the second connection structure can be a weld mark formed by welding, or an adhesive layer structure formed by bonding. Depending on the connection method of the two first parts 2131, the second connection structure can also be other structures. For example, the second connection structure is a weld mark formed by welding.

[0135] During the connection of the two first parts 2131, the two first parts 2131 abut against each other, and then a second connection structure is formed on the two first parts 2131 to connect the two first parts 2131 and enable electrical energy to be conducted through the two first parts 2131.

[0136] Since the surfaces of the two first parts 2131 that come into contact with each other are mainly used for conducting electrical energy, and the second connecting structure is difficult to set between the two first parts 2131 after the two first parts 2131 abut against each other; accordingly, the second connecting structure is set at the edge of the two connected first parts 2131 so as to better connect the two first parts 2131 through the second connecting structure, and at the same time, it can also reduce the negative impact that the second connecting structure may have on the electrical energy conduction between the two first parts 2131.

[0137] When the orthographic projection of the first part 2131 in the first direction overlaps with the first surface 2111, the peripheral edges of the first part 2131 are not easily blocked by the shell 211, and the peripheral edges of the two connected first parts 2131 can be connected; at this time, the second connecting structure can be arranged around the peripheral edges of the first part 2131 and form a closed ring structure.

[0138] This configuration increases the connection area between the second connecting structure and the corresponding two first parts 2131, thereby improving the strength of the second connecting structure and the connection stability of the two second parts 2132.

[0139] In this embodiment, a second connecting structure is provided to connect the two first parts 2131 and to surround the first parts 2131, so as to further improve the connection stability between the two first parts 2131.

[0140] refer to Figures 5 to 10 In some embodiments, the housing 211 further includes two second surfaces 2112 arranged at intervals along a second direction. The two first surfaces 2111 and the two second surfaces 2112 are connected end to end alternately along the periphery of the housing 211, and the second direction is perpendicular to the first direction. The area of ​​the first surface 2111 is greater than the area of ​​the second surface 2112; or the area of ​​the first surface 2111 is less than the area of ​​the second surface 2112.

[0141] The second direction is perpendicular to the first direction. When the first direction is the length direction X of the battery device 100, the second direction can be the width direction Y of the battery device 100 or the height direction Z of the battery device 100.

[0142] The shell 211 includes two second surfaces 2112 arranged at intervals along the second direction, and the two first surfaces 2111 and the two second surfaces 2112 are connected end to end in succession. Therefore, the second surface 2112 is also one of the surfaces of the shell 211. For example, when the shell 211 is cuboid, the two second surfaces 2112 are two oppositely arranged on the circumferential surfaces of the shell 211 along the second direction.

[0143] Two first surfaces 2111 and two second surfaces 2112 are connected end to end in alternating order, at which point the two first surfaces 2111 and the two second surfaces 2112 can together form the side of the shell 211.

[0144] The first surface 2111 and the second surface 2112 are surfaces with different areas on the side of the housing 211. The area of ​​the first surface 2111 can be larger than the area of ​​the second surface 2112. In this case, the first surface 2111 is the surface with a larger area on the side of the housing 211. Since the first part 2131 is provided on the first surface 2111 and the first parts 2131 of two adjacent battery cells 21 are directly connected, the side with the larger area of ​​two adjacent battery cells 21 arranged along the first direction is arranged adjacent to each other. The size of the battery cell 21 in the first direction is smaller, while the size in the second direction is larger.

[0145] The area of ​​the first surface 2111 can also be smaller than the area of ​​the second surface 2112. In this case, the first surface 2111 is the side surface with the smaller area among the side surfaces of the housing 211. Since the first part 2131 is provided on the first surface 2111 and the first parts 2131 of two adjacent battery cells 21 are directly connected, the side surfaces with the smaller area among the two adjacent battery cells 21 arranged along the first direction are arranged adjacently. The size of the battery cell 21 is larger in the first direction and smaller in the second direction.

[0146] In this embodiment, the first part 2131 can be located on the side with a larger area of ​​the housing 211 or on the side with a smaller area of ​​the housing 211, which improves the adaptability of the battery cell 21, thereby enabling the battery cell 21 to be adapted to different operating conditions of the housing 10, battery device 100, etc.

[0147] refer to Figure 4 , Figure 10 , Figure 12 In some embodiments, multiple battery cells 21 are also arranged along a second direction, which is perpendicular to the first direction. Each battery cell 21 located in the first direction forms a battery cell assembly 20. Multiple battery cell assemblies 20 are arranged along the second direction. The battery cell assembly 20 has end battery cells 21a located at both ends along the first direction. The first part 2131 of the end battery cells 21a of two adjacent battery cell assemblies 20 along the second direction is connected by an electrical connection structure 40.

[0148] The second direction is perpendicular to the first direction. When the first direction is the length direction X of the battery device 100, the second direction can be the width direction Y of the battery device 100 or the height direction Z of the battery device 100.

[0149] In addition to being arranged along the first direction, the battery cells 21 are also arranged along the second direction. That is, each battery cell 21 is arranged in an array along the first and second directions, forming a multi-row and multi-column array structure.

[0150] Since the first part 2131 of two adjacent battery cells 21 arranged along the first direction is directly connected, that is, each battery cell 21 in the same row arranged along the first direction is directly connected and conductive through the first part 2131; at this time, the battery cells 21 in the same row arranged along the first direction form a battery cell assembly 20, and each battery cell assembly 20 is arranged along the second direction.

[0151] In the battery cell assembly 20, the battery cells 21 located at both ends in the first direction are called end battery cells 21a. One first part 2131 of the end battery cell 21a is directly connected to the first part 2131 of another adjacent battery cell 21 in the same battery cell assembly 20, and the other first part 2131 of the end battery cell 21a is connected to the first part 2131 of the end battery cell 21a in another adjacent battery cell assembly 20.

[0152] The first part 2131 of the end battery cell 21a in two different battery cell assemblies 20 is connected by an electrical connection structure 40, which can be a plate-shaped conductive structure, a wire harness or other conductive structure.

[0153] The polarity of the first part 2131 of the end battery cell 21a in two different battery cell assembly 20 can be the same or different; when the polarities are different, the battery cell assembly 20 is connected in series; when the polarities are the same, the battery cell assembly 20 is connected in parallel.

[0154] In this embodiment, the battery cells 21 are arranged along the first direction and the second direction, and the battery cells 21 are arranged along the first direction to form a battery cell assembly 20. Different battery cell assemblies 20 are connected by an electrical connection structure 40 to connect the battery cell assemblies 20 into one unit, which facilitates the transmission of electrical energy.

[0155] refer to Figure 2 , Figure 4 In some embodiments, the housing 10 includes a frame structure 11 having a receiving space 111 extending along a third direction, in which the battery cell 21 is received, and the third direction is perpendicular to the first direction; the housing 10 also includes a cover plate 12 connected to the frame structure 11 and covering the receiving space 111.

[0156] The frame structure 11 refers to the structure in the housing 10 used to provide protection for the periphery of the battery device 100; the frame structure 11 may include multiple beams connected end to end, which may be box beams, I-beams or other beam structures; the material of the beams may include metal, plastic or other materials; the shape of the frame structure 11 may be a square frame structure, a circular frame structure or other frame structures, and the shape of the frame structure 11 may also be set according to the shape of the housing 10.

[0157] The accommodating space 111 is an internal space enclosed by the frame structure 11, and the battery cell 21 can be located in the accommodating space 111; the accommodating space 111 is a space structure that runs vertically through the body; depending on the shape of the frame structure 11, the accommodating space 111 can be a prism-shaped space, a cylindrical space, or a space structure of other shapes.

[0158] The accommodating space 111 extends through the frame structure 11 along a third direction, which is perpendicular to the first direction. If the first direction is the length direction X of the battery device 100, the third direction can be either the width direction Y of the battery device 100 or the height direction Z of the battery device 100. If the battery device 100 includes a second direction, the third direction is also perpendicular to the second direction. For example, the first direction is the length direction X of the battery device 100, the second direction is the width direction Y of the battery device 100, and the third direction is the height direction Z of the battery device 100.

[0159] The cover plate 12 refers to the structure in the box 10 used to close the receiving space 111. There can be two cover plates 12. At this time, the two cover plates 12 can be connected to the two sides of the frame structure 11 along the third direction and cover the receiving space 111. At this time, the two cover plates 12 can close the receiving space 111 and make the receiving space 111 a closed structure.

[0160] The cover plate 12 is connected to the frame structure 11. The cover plate 12 can be connected to the frame structure 11 by bonding, welding, screwing or other means. The cover plate 12 can be a circular plate structure, a square plate structure or other shapes. The shape of the cover plate 12 can also be set according to the shape of the frame structure 11. The material of the cover plate 12 can include metal, plastic or other materials.

[0161] This embodiment provides some specific structures of the housing 10 so that the battery cell 21 can be accommodated inside the housing 10 and the housing 10 can provide protection for the battery cell 21.

[0162] In some embodiments, the cover plate 12 is connected to the battery cell 21.

[0163] The cover plate 12 is connected to the battery cell 21. The cover plate 12 can be connected to the battery cell 21 by welding, bonding or other means. The cover plate 12 can be directly connected to the battery cell 21 or indirectly connected to the battery cell 21 through an intermediate structure. The intermediate structure can be an insulating plate, a cold plate or other structure.

[0164] Because the cover plate 12 is connected to the side of the frame structure 11 along the third direction, that is, the cover plate 12 is located on the side of the battery cell 21 along the third direction, and the first part 2131 of the battery cell 21 is located on one side of the housing 211 along the first direction; therefore, the battery cell 21 is relatively flat on the third direction side, and the cover plate 12 and the housing 211 of the battery cell 21 can have a large connection area on the third direction side, so that the cover plate 12 can be connected to the battery cell 21 relatively stably, and the battery cell 21 can provide support for the cover plate 12 and improve the strength of the cover plate 12.

[0165] When the battery cells 21 are arranged along the first and second directions, each battery cell 21 can be connected to the cover plate 12. At this time, each battery cell 21 can provide support for the cover plate 12, thereby greatly improving the strength of the cover plate 12.

[0166] In this embodiment, the cover plate 12 is connected to the battery cell 21 so that the battery cell 21 provides support for the cover plate 12, thereby improving the overall strength of the cover plate 12.

[0167] refer to Figure 4 , Figure 5 , Figure 12 In some embodiments, the battery cell 21 further includes a pressure relief structure 214 connected to the housing 211, the pressure relief structure 214 being disposed on the side of the housing 211 facing the cover plate 12.

[0168] The pressure relief structure 214 refers to the structure in the battery cell 21 used to relieve internal pressure when the internal pressure or temperature reaches a threshold. The pressure relief structure 214 may include an explosion-proof valve, an explosion-proof diaphragm or other structures. The pressure relief structure 214 is provided on the housing 211. When the pressure relief structure 214 is open, the gas in the housing 211 can be discharged to the outside of the housing 211 through the pressure relief structure 214.

[0169] The pressure relief structure 214 is located on the side of the housing 211 facing the cover plate 12. Since the housing 10 has two cover plates 12 and they are located on both sides of the frame structure 11 along the third direction, the pressure relief structure 214 can be located on either side of the housing 211 along the third direction.

[0170] In the event of thermal runaway of a battery cell 21, this configuration enables the high-temperature, high-pressure flue gas generated by thermal runaway to be ejected in the direction of the cover plate 12, thereby reducing the potential damage that the ejected high-temperature, high-pressure flue gas may cause to other adjacent battery cells 21.

[0171] For example, when the battery device 100 is applied to the vehicle 1000, the pressure relief structure 214 may be located on the side of the housing 211 facing the ground.

[0172] In this embodiment, the pressure relief structure 214 is located on the side of the housing 211 facing the cover plate 12. In the event of thermal runaway of the battery cell 21, this arrangement can reduce the risk of the flue gas generated by thermal runaway directly impacting other battery cells 21, thereby reducing the negative impact that thermal runaway of a certain battery cell 21 may have on other adjacent battery cells 21.

[0173] In some embodiments, an insulating structure is provided between two adjacent battery cells 21.

[0174] An insulating structure refers to a structure set between two adjacent battery cells 21 to reduce the risk of short circuit. The insulating structure can be an insulating film, an insulating plate, an insulating coating formed on the housing 211, or other structures. The shape of the insulating structure can be square, circular, or other shapes, and the shape of the insulating structure can also be set according to the shape of the housing 211.

[0175] When the battery cells 21 are arranged along the first direction, an insulating structure is provided between two adjacent battery cells 21 along the first direction. Since the first part 2131 of two adjacent battery cells 21 along the first direction is directly connected, there is a gap between the two adjacent battery cells 21, and the insulating structure can be provided in the gap.

[0176] When the battery cells 21 are arranged along the second direction, an insulating structure can also be provided between two adjacent battery cells 21 along the second direction.

[0177] In this embodiment, an insulating structure is provided to reduce the risk of short circuit between two adjacent battery cells 21.

[0178] refer to Figure 5 In some embodiments, the electrode terminal 213 further includes a second part 2132 connected to the first part 2131. The second part 2132 is connected to the housing 211 and is located on one side of the housing 211 along a third direction, which is perpendicular to the first direction.

[0179] The third direction is perpendicular to the first direction. When the first direction is the length direction X of the battery device 100, the third direction can be either the width direction Y of the battery device 100 or the height direction Z of the battery device 100. If the battery device 100 includes a second direction, the third direction is also perpendicular to the second direction. For example, the first direction is the length direction X of the battery device 100, the second direction is the width direction Y of the battery device 100, and the third direction is the height direction Z of the battery device 100.

[0180] The second part 2132 refers to a portion of the structure of the electrode terminal 213. The second part 2132 can be electrically connected to the electrode terminal 213 of an external circuit or other battery cell 21. The battery cell 21 may include only the first part 2131 and the second part 2132, or it may include other structures besides the first part 2131 and the second part 2132. The second part 2132 may be located only outside the housing 211, or it may extend partially into the housing 211. The second part 2132 may be connected to the first part 2131 by welding, bonding or other means, or the second part 2132 may be integrally formed with the first part 2131.

[0181] The second part 2132 is located on one side of the housing 211 along a third direction, that is, the first part 2131 and the second part 2132 are located on different sides of the housing 211 respectively; when the battery cells 21 are arranged along the first direction and the second direction, the second part 2132 is located on one side of the housing 211 along a third direction, and at this time the second part 2132 of each battery cell 21 is difficult to contact directly.

[0182] For example, the third direction is the height direction Z of the battery device 100, at which time the second part 2132 is located at the top or bottom of the housing 211.

[0183] In current battery cells 21, electrode terminals 213 are typically located at the top of the housing 211. Accordingly, in this embodiment, the second part 2132 is located at the top or bottom of the battery cell 21, so that the battery cell 21 provided in this embodiment can be adapted to current battery cell 21 processing equipment and processing procedures, thereby reducing the production and processing costs of the battery cell 21 and reducing the modification costs of the battery cell 21 production equipment.

[0184] In this embodiment, the electrode terminal 213 further includes a second part 2132, and the first part 2131 and the second part 2132 are respectively located on different sides of the housing 211, so that the battery cell 21 can be adapted to existing processing equipment and production lines, making it easier to process and reducing production difficulty and cost.

[0185] refer to Figure 5 , Figure 6In some embodiments, the size of the second part 2132 ranges from 0.5 mm to 3 mm in the third-party direction.

[0186] The dimension of the second part 2132 in the third direction is the height of the second part 2132 protruding from the surface of the housing 211, which is the dimension shown by L2 in the figure.

[0187] The larger the size of the second part 2132 in the third direction, the easier it is to install the electrode terminal 213; at the same time, the larger the size of the second part 2132 in the third direction, the larger the space occupied by the second part 2132, and the lower the energy density of the battery device 100.

[0188] Accordingly, the dimensions of the second part 2132 in the third direction are in the range of 0.5mm to 3mm to facilitate the production and installation of the electrode terminal 213, while reducing the negative impact of the second part 2132 on the energy density of the battery device 100. For example, the dimensions of the second part 2132 in the third direction can be 0.5mm, 1mm, 1.25mm, 1.5mm, 2mm, 2.5mm, 3mm or other values.

[0189] For example, the second part 2132 has a dimension of 0.5 mm in the third direction. At this time, the size of the second part 2132 is small, and the negative impact of the second part 2132 on the energy density of the battery device 100 is small.

[0190] For example, the second part 2132 has a dimension of 1.25 mm in the third direction. At this time, the size of the second part 2132 is moderate, which can reduce the negative impact of the electrode terminal 213 on the energy density of the battery device 100, and also facilitates production and installation.

[0191] For example, the second part 2132 has a dimension of 3mm in the third direction. At this time, the size of the second part 2132 is large enough to facilitate the production and installation of the electrode terminal 213.

[0192] This embodiment provides a range of sizes for the second part 2132, which enables the second part 2132 to be stably connected to the housing 211, reduces the space occupied by the second part 2132, improves space utilization, and increases the energy density of the battery device 100.

[0193] In some embodiments, the battery device 100 includes a housing 10 and a battery cell 21.

[0194] The housing 10 includes a frame structure 11 and two cover plates 12 connected to the frame structure 11. The frame structure 11 forms a receiving space 111 that extends vertically along the height direction Z of the battery device 100. The two cover plates 12 are respectively connected to the two sides of the frame structure 11 along the height direction Z of the battery device 100, and the two cover plates 12 respectively close the two sides of the receiving space 111 to form a closed space.

[0195] The battery cells 21 are housed in the housing space 111, and the battery cells 21 are arranged in an array along the length direction X and the width direction Y of the battery device 100.

[0196] The battery cell 21 includes a housing 211 and electrode terminals 213 connected to the housing 211. The housing 211 includes two first surfaces 2111 spaced apart along the length X direction of the battery device 100, and two second surfaces 2112 spaced apart along the width Y direction of the battery device 100. The two first surfaces 2111 and the two second surfaces 2112 are connected end to end in sequence to form the side surface of the housing 211, and the area of ​​the first surface 2111 is smaller than the area of ​​the second surface 2112.

[0197] The electrode terminal 213 includes a first part 2131 and a second part 2132 connected to the first part 2131. The first part 2131 is disposed on the first surface 2111, and the second part 2132 is disposed on one side of the housing 211 along the height direction Z of the battery device 100.

[0198] The first parts 2131 of two adjacent battery cells 21 arranged along the length X of the battery device 100 are directly connected by welding.

[0199] The cover plate 12 is directly connected to the housing 211 on one side along the height direction Y of the battery device 100.

[0200] Secondly, embodiments of this application also provide a battery cell 21, which is applied to the battery device 100 provided in some embodiments of the first aspect.

[0201] The battery cell 21 includes a housing 211 and electrode terminals 213 connected to the housing 211; the housing 211 includes two first surfaces 2111 arranged at intervals along a first direction, and the housing 211 also includes two opposing and spaced third surfaces 2113, the third surfaces 2113 being connected to the first surfaces 2111; the electrode terminals 213 include a first part 2131 and a second part 2132 connected to the first part 2131, the first part 2131 being connected to the first surface 2111, and the second part 2132 being connected to the third surface 2113.

[0202] The housing 211 refers to the structure used to form the internal environment of the battery cell 21. The internal environment formed by the housing 211 can be used to accommodate the electrode assembly 212, electrolyte, or other components. The housing 211 can be prismatic, cylindrical, flat, or other shapes, and the shape of the housing 211 can also be set according to the shape of the battery cell 21. The material of the housing 211 can include metal, plastic, or other materials.

[0203] The housing 211 includes two first surfaces 2111 spaced apart along a first direction. Since the battery cells 21 are arranged along the first direction, the first surfaces 2111 are one of the sides of the housing 211. For example, when the housing 211 is cuboid, the two first surfaces 2111 are two oppositely arranged along the first direction on the peripheral side of the housing 211; for example, when the housing 211 is cylindrical, the two first surfaces 2111 may be a portion of the cylindrical side of the housing 211.

[0204] The housing 211 also includes two opposing and spaced-apart third surfaces 2113, which are connected to the first surface 2111. The third surfaces 2113 can be surfaces of the housing 211 along its height direction, or they can be other surfaces different from the first surface 2111. For example, when the housing 211 is cuboid, the two third surfaces 2113 are two surfaces of the housing 211 along its height direction.

[0205] Electrode terminal 213 refers to the structure in battery cell 21 used for electrical connection with external circuits or other battery cells 21. Battery cell 21 can input or output electrical energy through electrode terminal 213. There are two electrode terminals 213, and the two electrode terminals 213 have different polarities. The two electrode terminals 213 can typically be a positive terminal and a negative terminal. The shape of electrode terminal 213 can be prism-shaped, cylindrical, disc-shaped, square-shaped, or other shapes. One end of electrode terminal 213 extends into the housing 211 and is electrically connected to electrode assembly 212, and the other end of electrode terminal 213 extends outside the housing 211 to facilitate electrical connection with external circuits or other battery cell 21 electrode terminals 213.

[0206] The first part 2131 refers to a portion of the structure of the electrode terminal 213. The first part 2131 can be electrically connected to the electrode terminal 213 of an external circuit or another battery cell 21. The battery cell 21 may include only the first part 2131, or it may include other structures besides the first part 2131. The first part 2131 may be located only outside the housing 211, or it may extend partially into the housing 211. The two first parts 2131 are respectively located on the first surface 2111, that is, the two first parts 2131 are located on opposite sides of the housing 211 along the first direction.

[0207] The second part 2132 refers to a portion of the structure of the electrode terminal 213. The second part 2132 can be electrically connected to the electrode terminal 213 of an external circuit or other battery cell 21. The battery cell 21 may include only the first part 2131 and the second part 2132, or it may include other structures besides the first part 2131 and the second part 2132. The second part 2132 may be located only outside the housing 211, or it may extend partially into the housing 211. The second part 2132 may be connected to the first part 2131 by welding, bonding or other means, or the second part 2132 may be integrally formed with the first part 2131. The two second parts 2132 are respectively located on the two third surfaces 2113.

[0208] In this embodiment, the electrode terminal 213 includes a first part 2131 and a second part 2132, and the first part 2131 and the second part 2132 are respectively located on different sides of the housing 211, so that the first part 2131 of each battery cell 21 can be directly connected and the space occupied by the battery cell 21 can be reduced. At the same time, it also makes the battery cell 21 adaptable to existing processing equipment and production lines, which is convenient for processing and reduces the production difficulty and cost.

[0209] Thirdly, embodiments of this application also provide an electrical device, including the battery device 100 provided in some embodiments of the first aspect. In this electrical device, the battery device 100 has a higher energy density, and the housing 10 also has higher strength.

[0210] Fourthly, embodiments of this application also provide a vehicle 1000, including the battery device 100 provided in some embodiments of the first aspect.

[0211] In the vehicle 1000, the battery device 100 is used as at least part of the floor structure of the vehicle 1000, which refers to the structure in the vehicle 1000 used to carry occupants and goods; the battery device 100 may be part of the floor structure or the entire floor structure.

[0212] When the battery unit 100 serves as the floor, the housing 10 directly supports the occupants and items. In this case, the battery cells 21 can provide support for the cover 12 of the housing 10, thereby enabling the cover 12 to have high strength and good support performance.

[0213] 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: Box; At least two battery cells are arranged in the housing along a first direction; The battery cell includes a housing and two electrode terminals disposed on the housing. The housing includes two first surfaces spaced apart along the first direction. Each electrode terminal includes a first portion disposed on the first surface, and the first portions of the two electrode terminals are respectively disposed on the two first surfaces. The first portions of two adjacent battery cells along the first direction are directly connected, and the polarities of the two connected electrode terminals are different.

2. The battery device according to claim 1, characterized in that, In the first direction, the orthographic projection of the first part lies within the first surface.

3. The battery device according to claim 1 or 2, characterized in that, In the first direction, the size of the first part ranges from 0.5 mm to 3 mm.

4. The battery device according to claim 1 or 2, characterized in that, In a second direction perpendicular to the first direction, the size of the first part is less than or equal to the size of the housing.

5. The battery device according to claim 4, characterized in that, The battery device further includes a first connection structure, which is connected to the edges of the two connected first portions and extends along the second direction.

6. The battery device according to claim 1, characterized in that, In the first direction, the orthographic projection of the first part overlaps with the first surface.

7. The battery device according to claim 6, characterized in that, The battery device further includes a second connection structure, which is connected to the edges of the two connected first parts and is disposed around the periphery of the two connected first parts.

8. The battery device according to claim 1, characterized in that, The housing also includes two second surfaces arranged at intervals along a second direction, the two first surfaces and the two second surfaces being connected end to end alternately along the periphery of the housing, and the second direction being perpendicular to the first direction; The area of ​​the first face is greater than the area of ​​the second face; or the area of ​​the first face is less than the area of ​​the second face.

9. The battery device according to claim 1, characterized in that, The plurality of battery cells are also arranged along a second direction, which is perpendicular to the first direction. Each of the battery cells located in the first direction forms a battery cell assembly, and the plurality of battery cell assemblies are arranged along the second direction. The battery cell assembly has end battery cells located at both ends along the first direction, and the first portions of the end battery cells of two adjacent battery cell assemblies along the second direction are connected by an electrical connection structure.

10. The battery device according to claim 1, characterized in that, The housing includes a frame structure, the frame structure having a receiving space extending along a third direction, the battery cell being received in the receiving space, the third direction being perpendicular to the first direction; The enclosure also includes a cover plate, which is connected to the frame structure and covers the accommodating space.

11. The battery device according to claim 10, characterized in that, The cover plate is connected to the battery cell.

12. The battery device according to claim 10, characterized in that, The battery cell also includes a pressure relief structure connected to the housing, the pressure relief structure being located on the side of the housing facing the cover plate.

13. The battery device according to claim 1, characterized in that, The electrode terminal further includes a second part connected to the first part, the second part being connected to the housing, and the second part being located on one side of the housing along a third direction, the third direction being perpendicular to the first direction.

14. The battery device according to claim 13, characterized in that, In the third direction, the size range of the second part is 0.5mm to 3mm.

15. A single battery cell, characterized in that, Applied to a battery device as described in any one of claims 1-14, the battery cell includes a housing and electrode terminals connected to the housing; The housing includes two first surfaces spaced apart along the first direction, and the housing also includes two opposing and spaced third surfaces, the third surfaces being connected to the first surfaces; The electrode terminal includes a first part and a second part connected to the first part, the first part being connected to the first surface and the second part being connected to the third surface.

16. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-14.

17. A vehicle, characterized in that, Includes a battery device as described in any one of claims 1-14, the battery device being used as at least part of the floor structure of the vehicle.

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