Battery device and electric appliance

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a box body and a plurality of battery cell assemblies accommodated in the box body and arranged along a first direction. The battery cell assembly comprises a plurality of battery cells stacked along a second direction. The battery cell comprises a shell comprising two first walls arranged along the first direction and a plurality of electrode terminals arranged on the first walls. The plurality of battery cell assemblies comprise a first battery cell assembly and a second battery cell assembly arranged adjacently, all the electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all the electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group. The orthographic projection of the first terminal group and the orthographic projection of the second terminal group do not overlap in the same plane perpendicular to the first direction. The application can reduce the risk of short circuit caused by the overlap of the first terminal group and the second terminal group, and improve the reliability of the battery device.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving battery reliability is one of the research directions. Utility Model Content

[0004] This application provides a battery device and an electrical appliance, which helps to improve the reliability of the battery device.

[0005] According to a first aspect of this application, a battery device is provided, comprising a housing and a plurality of battery cell assemblies. The plurality of battery cell assemblies are housed within the housing and arranged along a first direction. Each battery cell assembly includes a plurality of battery cells stacked along a second direction perpendicular to the first direction. Each battery cell includes a housing and a plurality of electrode terminals. The housing includes two first walls arranged along the first direction, and the plurality of electrode terminals are disposed on the first walls. The plurality of battery cell assemblies include adjacent first and second battery cell assemblies. All electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group. In the same plane perpendicular to the first direction, the orthographic projections of the first and second terminal groups do not overlap. The non-overlapping of the first and second terminal groups along the first direction helps reduce the risk of short circuits or even fires and explosions caused by electrode terminals of the first and second terminal groups colliding under extreme conditions such as vibration and impact, thereby improving the reliability of the battery device.

[0006] In some embodiments, the battery device includes a plurality of first busbars, each connecting the electrode terminals of at least two battery cells in the same battery cell assembly. A portion of the plurality of first busbars is located between the first battery cell assembly and the second battery cell assembly. Among the plurality of first busbars located between the first and second battery cell assemblies, the first busbar connecting the first battery cell assembly and the first busbar connecting the second battery cell assembly are spaced apart along a third direction, with the first direction, second direction, and third direction being perpendicular to each other. Along the first direction, the first busbar connecting the first battery cell assembly and the first busbar connecting the second battery cell assembly do not overlap. This helps reduce the risk of short circuits or even fires and explosions caused by indirect contact between the first and second terminal groups through the first busbars under extreme operating conditions such as vibration and impact, thereby improving the reliability of the battery device.

[0007] In some embodiments, among the plurality of first busbars located between the first battery cell assembly and the second battery cell assembly, the distance between the first busbar connecting the first battery cell assembly and the first busbar connecting the second battery cell assembly along a third direction is d, where d ≥ 5 mm. This increases the distance between the first busbar connecting the first battery cell assembly and the first busbar connecting the second battery cell assembly along a third direction, further reducing the risk of overlap between the first terminal group and the second terminal group through the first busbars.

[0008] In some embodiments, a battery cell includes a second wall and a third wall arranged along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other; the second wall is closer to the electrode terminals than the third wall. Along the third direction, the electrode terminals are offset toward the second wall. On the one hand, this facilitates a foolproof design, reducing the risk of reverse connection of the positive and negative terminals of the battery cell; on the other hand, the battery cells of adjacent battery cell assemblies can be arranged in opposite directions in the third direction, so that the electrode terminals of adjacent battery cell assemblies do not overlap in the first direction, which helps to reduce the risk of electrode terminal overlap between adjacent battery cell assemblies.

[0009] In some embodiments, there are two electrode terminals, each disposed on one of the two first walls. In the same plane perpendicular to the first direction, the orthographic projections of the two electrode terminals of the same battery cell do not overlap. The staggered arrangement of the two electrode terminals of the same battery cell facilitates quick determination of the battery cell's arrangement direction during assembly, improving assembly efficiency and reducing the risk of reversed positive and negative connections. Neither battery cells in adjacent battery cell assemblies need to be arranged in reverse, ensuring that the electrode terminals of adjacent battery cell assemblies do not overlap in the first direction, thus reducing the risk of electrode terminal overlap between adjacent battery cell assemblies.

[0010] In some embodiments, the battery cell includes an electrode assembly housed within a casing. The electrode assembly includes a main body and two tabs connected to the main body, the two tabs having opposite polarities. A first wall includes a first wall portion, a second wall portion, and a bent portion. Along a first direction, the first wall portion is closer to the main body than the second wall portion. The bent portion connects the first wall portion and the second wall portion at its two ends along a third direction, respectively. The first direction, the second direction, and the third direction are perpendicular to each other. Electrode terminals are disposed on the first wall portion. The electrode terminals disposed on the first wall portion are closer to the main body portion, which helps to increase the spacing between the electrode terminals and adjacent battery cell assemblies in the first direction, reducing the risk of overlap between the electrode terminals and the electrode terminals of adjacent battery cell assemblies. The electrode terminals disposed on the first wall portion can also share a portion of the space in the first direction with the second wall portion, which helps to improve space utilization, thereby increasing the energy density of the battery cell and the battery device.

[0011] In some embodiments, the arrangement direction of the first battery cell assembly near the first and second walls of the second battery cell assembly is opposite to the arrangement direction of the second battery cell assembly near the first and second walls of the first battery cell assembly. This facilitates the staggering and non-overlapping of the electrode terminals of adjacent battery cell assemblies, thereby reducing the risk of electrode terminal overlap between adjacent battery cell assemblies.

[0012] In some embodiments, the battery device includes a plurality of first busbars, each first busbar connecting to the electrode terminals of at least two battery cells in the same battery cell assembly; in the same plane perpendicular to a first direction, the orthographic projection of the first busbar does not overlap with the orthographic projection of the second wall portion of the battery cell connected to the first busbar. During assembly, the first busbar is less likely to interfere with the second wall portion, which helps to improve the connection strength and reliability between the first busbar and the electrode terminals.

[0013] In some embodiments, in the same plane perpendicular to a third direction, the orthographic projection of the first busbar component partially overlaps with the orthographic projection of the second wall portion of the battery cell connected to the first busbar component. The first busbar component and the battery cell connected to the first busbar component can share a portion of the space in the first direction, which is beneficial for improving space utilization and increasing the energy density of the battery device.

[0014] In some embodiments, the battery device includes a connector that connects to the second wall portion of at least a portion of the battery cells in the battery cell assembly. This helps reduce the risk of interference between the connector and electrode terminals or other components (e.g., a first busbar). At least a portion of the battery cells in the battery cell assembly can be connected together via the connector, which facilitates grouping of these cells and improves the stability of the battery cell assembly.

[0015] In some embodiments, the battery cell assembly has connectors on both sides along the first direction. Multiple connectors can connect multiple battery cells of the battery cell assembly on both sides of the first direction, which helps to strengthen the structure of the battery cell assembly on both sides of the first direction and further improves the stability of the battery cell assembly.

[0016] In some embodiments, there are multiple connectors, including a first connector located between two adjacent battery cell assemblies and connected to the battery cells of the two battery cell assemblies in a first direction. Connecting the battery cells of two adjacent battery cell assemblies through the first connector not only reduces the number of connectors, saves space in the battery device, and increases the energy density of the battery device, but also improves the stability of the multiple battery cell assemblies.

[0017] In some embodiments, there are multiple connectors, including a second connector disposed between the housing and the battery cell assembly near the housing. The second connector can fill the gap between the housing and the battery cell assembly, thereby reducing the swaying amplitude of the battery cell assembly under vibration or impact conditions and improving the stability and reliability of the battery cell assembly.

[0018] In some embodiments, the housing includes two first beams arranged along a first direction; a second connector is connected to the first beams, or the second connector is integrally formed with the first beams. This helps to enhance the connection strength between the battery cell assembly and the housing, and enhances the overall rigidity and stability of the battery device.

[0019] In some embodiments, a first recess is formed on the side of the first wall near the main body portion, the bottom surface of the first recess corresponding to the second wall portion, and the first recess is recessed relative to the first surface of the first wall portion facing the main body portion; at least portions of the two tabs are respectively located on both sides of the main body portion along a first direction, and in the same plane perpendicular to the first direction, the orthographic projection of the tab near the first wall is located within the orthographic projection of the first recess of the first wall. There is no thickness overlap between the tabs and the first wall portion. The first recess can provide a receiving space and / or a buffer space for the tabs, reducing the squeezing effect on the tabs and lowering the risk of tab breakage.

[0020] In some embodiments, the tabs near the first wall are partially accommodated within a first recess in the first wall. The first recess in the first wall provides partial accommodating space for the tabs near the first wall, allowing the tabs near the first wall and the electrode terminals disposed on the first wall to share a portion of the space in a first direction. This reduces the additional space occupied by the tabs, which is beneficial for improving space utilization, increasing the energy density of the battery cell, and thus increasing the energy density of the battery device.

[0021] In some embodiments, the battery cell includes two adapters, each adapter connecting an electrode terminal and a tab located on the same side of the main body along a first direction. Each adapter includes a first adapter portion, a second adapter portion, and a third adapter portion, with the third adapter portion connecting to the first and second adapter portions at its two ends along the third direction, respectively. The first adapter portion is located between the main body and a first wall and connects to the electrode terminal disposed on the first wall. At least a portion of the second adapter portion is accommodated in a first recess of the first wall and connects to a tab near the first wall. This allows for both electrical connection between the tab and the electrode terminal located on the same side of the main body via the adapters and spatial sharing of the tab and electrode terminal located on the same side of the main body in the first direction.

[0022] In some embodiments, a first recess is formed on the side of the first wall near the main body, the bottom surface of the first recess corresponds to the second wall, and the first recess is recessed relative to the first surface of the first wall facing the main body. At least portions of the two tabs are respectively located on both sides of the main body along a first direction. The battery cell includes two first insulating members, which are respectively disposed between the main body and the two first walls, and portions of the two tabs are respectively located on the side of the two first insulating members away from the main body; in the same plane perpendicular to the first direction, the orthographic projection of the first insulating member near the first wall is located within the orthographic projection of the first recess of the first wall, and at least a portion of the first insulating member near the first wall is accommodated within the first recess of the first wall. The first recess can provide at least a partial accommodating space for the first insulating member, and the electrode terminals disposed on the first wall can share a portion of the space in the first direction with the first recess, thereby sharing a portion of the space in the first direction with the first insulating member, which is beneficial to improving space utilization, increasing the energy density of the battery cell, and thus increasing the energy density of the battery device.

[0023] In some embodiments, the first insulating member includes an insulating body and a first sidewall. A portion of the electrode tab near the first insulating member is located on the side of the insulating body away from the body portion. The first sidewall is connected to one side of the insulating body along a second direction. At least a portion of the first sidewall is received in a first recess. The first sidewall can share at least a portion of the space in the first direction with the electrode terminal, which is beneficial for improving space utilization.

[0024] In some embodiments, the first insulating member has an opening, and two tabs are respectively inserted through the openings of the two first insulating members. Inserting the tabs through the openings helps to improve the constraint and restriction effect of the first insulating member on the tabs, reducing the risk of short circuits caused by the insertion of the tabs into the main body.

[0025] In some embodiments, the battery cell includes two electrode assemblies stacked along a second direction; in the second direction, a first insulating member is located between tabs on the same side of the two electrode assemblies. The first insulating member can simultaneously separate a portion of the tabs on the same side of the two electrode assemblies from the main body, reducing the risk of short circuits caused by the insertion of the tabs on the same side of the two electrode assemblies into the main body, and also helps to simplify the internal structure of the battery cell.

[0026] In some embodiments, the first insulating member is connected to the second wall portion. The second wall portion can improve the structural stability of the first insulating member, reduce the possibility of the first insulating member shaking or shifting, reduce the risk of the first insulating member pulling on the electrode tab, and help improve the connection stability of the electrode tab and the adapter, thereby improving the insulation and isolation effect of the first insulating member.

[0027] In some embodiments, the second wall portion includes a first snap-fit ​​portion, and the first insulating member includes a second snap-fit ​​portion, with the first snap-fit ​​portion snapping into the second snap-fit ​​portion. This simplifies the connection method and improves assembly efficiency.

[0028] In some embodiments, the second wall portion includes a first base portion and a first insulating portion interconnected, the first base portion being located on the side of the first insulating portion away from the electrode assembly. The first engaging portion is a snap-fit, protruding from a fifth surface of the tab away from the body portion along the direction from the first wall portion towards the body portion. The second engaging portion is a slot.

[0029] In some embodiments, the battery cell includes a second insulating member that covers the main body portion. A portion of the second insulating member is connected to a first insulating member, and another portion of the second insulating member is connected to a first wall portion. This improves the stability of the first insulating member relative to the main body portion and relative to the first wall portion, thereby reducing the risk of the first insulating member shaking or shifting and improving the insulation protection effect.

[0030] In some embodiments, the first recess extends to the edge of the first wall on at least one side in the second direction. This facilitates increasing the size of the first recess in the second direction, thereby providing greater accommodating space for the first insulator, the tab, and / or the adapter, and reducing the risk of interference.

[0031] In some embodiments, the housing includes two fourth walls arranged along a second direction. At least one fourth wall includes a wall body and a protrusion. The wall body is connected to the first wall portion, and the protrusion protrudes from the wall body along a first direction and is connected to the second wall portion. This not only allows for adaptation to the shape of the first wall for direct connection, but also increases the distance between the central region of the second wall and the connection point between the second and first walls, reducing the risk of reduced connection strength or even cracking at the connection point due to the expansion and contraction of the battery cells.

[0032] In some embodiments, the battery device includes a third insulator located between two adjacent battery cell assemblies. The third insulator further enhances the insulation effect between the two adjacent battery cell assemblies, which helps to further reduce the risk of overlap between the first terminal group and the second terminal group.

[0033] In some embodiments, the housing includes a housing and two end caps, the housing having two housing openings, the two end caps respectively covering the two housing openings, and the two first walls being the two end caps.

[0034] According to a second aspect of this application, this application also provides an electrical device that includes a battery device provided in any embodiment of the first aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0037] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0038] Figure 3 yes Figure 2 A schematic diagram of the exploded structure of a single battery cell in the battery device shown.

[0039] Figure 4 yes Figure 2 A cross-sectional view of the battery device shown.

[0040] Figure 5 yes Figure 4 A magnified view of region A in the middle.

[0041] Figure 6 This is a partial structural schematic diagram of a battery device provided in other embodiments of this application.

[0042] Figure 7 This is a cross-sectional view of a battery device provided in some embodiments of this application.

[0043] Figure 8 yes Figure 7 A magnified view of region B in the middle.

[0044] Figure 9 yes Figure 2A top view of a single battery cell in the battery device shown.

[0045] Figure 10 It is along Figure 9 A cross-sectional view taken from the direction CC in the middle.

[0046] Figure 11 yes Figure 10 A magnified schematic diagram of region D in the middle.

[0047] Figure 12 yes Figure 2 A front view of a single battery cell in the battery device shown.

[0048] Figure 13 It is along Figure 12 The cross-sectional view taken from the direction EE in the middle.

[0049] Figure 14 yes Figure 13 A magnified schematic diagram of the middle region F.

[0050] Figure 15 This is a schematic diagram of the structure of the first insulating member of the battery device provided in some embodiments of this application.

[0051] Figure 16 This is a partial cross-sectional view of a battery cell of a battery device provided in other embodiments of this application.

[0052] Figure 17 This is a cross-sectional view of a battery cell of a battery device provided in some embodiments of this application.

[0053] Figure 18 yes Figure 17 A magnified schematic diagram of the middle region M.

[0054] Figure 19 yes Figure 17 A magnified schematic diagram of region N in the middle.

[0055] The attached figures are labeled as follows:

[0056] Vehicle 1, controller 3, motor 4;

[0057] Battery device 2, third insulating component 201, battery cell assembly 7, first battery cell assembly 701, second battery cell assembly 702, connector 8, first connector 801, second connector 802, third connector 803, first busbar component 901, third surface 9011, second busbar component 902.

[0058] Box 5, first box section 5a, second box section 5b, accommodating space 5c, first beam 501;

[0059] Battery cell 6, first battery cell 601, second battery cell 602, electrode assembly 10, main body 11, electrode tab 12, folding part 121, second bending part 122, connecting part 123, outer shell 20, housing 21, housing opening 211, end cap 22, first wall 23, first wall portion 231, first surface 2311, second base 2313, second insulating part 2314, second wall portion 232, second surface 2321, first snap-fit ​​part 2322, first base 2323, first insulating part 2322, first snap-fit ​​part 2322, first base 2323, first insulating part 2322, first insulating part 2323, first insulating part 2322, first snap-fit ​​part 2322, first insulating part 2323, first insulating part 232 ... Edge 2324, first bend 233, third base 2333, third insulating part 2334, first recess 234, second wall 24, third wall 25, fourth wall 26, wall body 261, protrusion 262, electrode terminal 30, adapter 40, first adapter 41, second adapter 42, third adapter 43, first insulating part 50, opening 51, insulating body 52, two insulator parts 521, first side wall 53, second snap-fit ​​part 54, second side wall 55, second insulating part 70;

[0060] First direction X, second direction Y, third direction Z. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0063] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "adhesion" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0067] In this application, "multiple" means two or more (including two).

[0068] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0069] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0070] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0071] A typical battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are located within the housing. The housing encapsulates the electrode assembly and electrolyte components. The electrode assembly includes tabs, which are electrically connected to the electrode terminals via adapters or directly to the electrode terminals. The electrode terminals are used to electrically connect the electrode assembly to external circuitry within the battery cell to enable charging or discharging of the battery cell.

[0072] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0073] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0075] In some implementations, the separator is positioned between the positive and negative electrodes.

[0076] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0077] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0078] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0079] In some embodiments, the electrode assembly has a stacked structure.

[0080] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0081] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0082] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0083] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0084] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0085] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0086] In related technologies, electrode terminals are typically positioned upwards. When multiple battery cells are stacked, the busbars used to connect the battery cells are located on top of the battery cells, occupying too much space and affecting the energy density of the battery device.

[0087] To improve the energy density of individual battery cells, electrode terminals can be located on the sidewalls of the cells to reduce the space occupied by them. However, when assembling a system, multiple battery cells are stacked to form battery cell assemblies, which are arranged in multiple rows. The electrode terminals of adjacent rows of battery cell assemblies may overlap. In the event of a collision or other safety incident, the electrode terminals of adjacent battery cell assemblies may easily come into contact, posing a safety risk and affecting the reliability of the battery device.

[0088] In view of this, the present application provides a technical solution in which, in a first battery cell assembly and a second battery cell assembly arranged adjacent to each other along a first direction, all electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group. In the same plane perpendicular to the first direction, the orthographic projection of the first terminal group and the orthographic projection of the second terminal group do not overlap. In the event of a collision or other extreme conditions, the risk of overlap between the first terminal group and the second terminal group can be reduced, which is beneficial to improving the reliability of the battery device.

[0089] The technical solutions provided in this application are applicable to battery devices and electrical equipment using battery devices.

[0090] 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 devices can be, but are 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.

[0091] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0092] Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. (Refer to...) Figure 1 Vehicle 1 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 device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. 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, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0093] 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.

[0094] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2The battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a space for the battery cell 6 and 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, together defining a space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, while the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b together define the space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one open side, with the open side of the first housing portion 5a overlapping the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0095] 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.

[0096] 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.

[0097] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

[0098] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0099] Figure 3 yes Figure 2 The diagram shows an exploded view of the battery cell of the battery device. Figure 4 yes Figure 2 The cross-sectional view of the battery device shown. Figure 5 yes Figure 4 An enlarged schematic diagram of region A in the middle. Figure 6 This is a partial structural schematic diagram of a battery device provided in other embodiments of this application. Figure 7 This is a cross-sectional view of a battery device provided in some embodiments of this application. Figure 8 yes Figure 7 An enlarged schematic diagram of region B in the middle. Figure 9 yes Figure 2 A top view of a single battery cell in the battery device shown. Figure 10 It is along Figure 9 A sectional view taken from the CC direction in the middle. Figure 11 yes Figure 10 An enlarged schematic diagram of region D in the middle. Figure 12 yes Figure 2 The front view of a single battery cell in the battery device shown. Figure 13 It is along Figure 12 The sectional view taken by EE in the middle. Figure 14 yes Figure 13 A magnified schematic diagram of the middle region F. Figure 15 This is a schematic diagram of the structure of the first insulating member of the battery device provided in some embodiments of this application. Figure 16 This is a partial cross-sectional view of a battery cell of a battery device provided in other embodiments of this application. Figure 17 This is a cross-sectional view of a battery cell of a battery device provided in some embodiments of this application. Figure 18 yes Figure 17 An enlarged schematic diagram of region M in the middle. Figure 19 yes Figure 17 A magnified schematic diagram of region N in the middle.

[0100] Reference Figures 2 to 19 The battery device 2 provided in this application embodiment includes a housing 5 and a plurality of battery cell assemblies 7. The plurality of battery cell assemblies 7 are housed within the housing 5 and arranged along a first direction X. Each battery cell assembly 7 includes a plurality of battery cells 6 stacked along a second direction Y, which is perpendicular to the first direction X. Each battery cell 6 includes a housing 20 and a plurality of electrode terminals 30. The housing 20 includes two first walls 23 arranged along the first direction X, and the plurality of electrode terminals 30 are disposed on the first walls 23. The plurality of battery cell assemblies 7 include a first battery cell assembly 701 and a second battery cell assembly 702 arranged adjacent to each other. All electrode terminals 30 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group. All electrode terminals 30 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group. In the same plane perpendicular to the first direction X, the orthographic projections of the first terminal group and the second terminal group do not overlap.

[0101] The battery cell 6 includes an electrode assembly 10, which is housed within a housing 20. The housing 20 encapsulates the electrode assembly 10 and other components such as the electrolyte. The housing 20 can be made of steel, aluminum, plastic (e.g., polypropylene), composite metal (e.g., copper-aluminum composite), or aluminum-plastic film, etc.

[0102] In some embodiments, the housing 20 is a hollow structure, with an internal space for accommodating the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a cuboid structure, a cuboid housing can be selected.

[0103] The outer casing 20 can be made of various materials, such as metal or plastic. Optionally, the outer casing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the outer casing 20 can be a steel casing, aluminum casing, plastic casing (such as polypropylene), composite metal casing (such as copper-aluminum composite casing), or aluminum-plastic film, etc.

[0104] As an example, refer to Figure 3 The outer casing 20 includes a casing 21 and an end cap 22. The casing 21 has a casing opening 211, and the end cap 22 is used to close the casing opening 211.

[0105] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0106] The housing 21 and the end cap 22 can be separate components. For example, a housing opening 211 can be provided on the housing 21, and the end cap 22 can be used to cover the housing opening 211 to form an internal cavity of the battery cell 6.

[0107] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

[0108] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0109] The housing 21 may be open at one end or open at both ends. Exemplarily, the housing 21 may be open on one side, with an end cap 22 covering the housing opening 211 of the housing 21. The two first walls 23 may be one wall of the end cap 22 and the housing 21, respectively. As another example, the housing 21 may also be open on both sides, with two end caps 22 covering the two housing openings 211 of the housing 21, respectively. The two first walls 23 may be two end caps 22.

[0110] The electrode terminal 30 is used to connect to an external circuit to output electrical energy of the battery cell 6 to the external circuit or to input electrical energy to the battery cell 6 through the external circuit.

[0111] In some examples, multiple electrode terminals 30 are disposed on the same first wall 23. In the first battery cell assembly 701, at least a portion of the battery cells 6 have their first walls 23 with electrode terminals 30 facing the second battery cell assembly 702. In the second battery cell assembly 702, at least a portion of the battery cells 6 have their first walls 23 with electrode terminals 30 facing the first battery cell assembly 701.

[0112] In other examples, multiple electrode terminals 30 are respectively disposed on two first walls 23, and each first wall 23 is provided with an electrode terminal 30. This helps to reduce the risk of short circuit caused by the positive and negative terminals of the battery cell 6 being connected together, and improves the reliability of the battery cell 6.

[0113] Each first wall 23 may have one electrode terminal 30, or it may have two or more electrode terminals 30. Optionally, the number of electrode terminals 30 is two, and the two electrode terminals 30 are respectively provided on two first walls 23.

[0114] In the same plane perpendicular to the first direction X, the orthographic projection of any electrode terminal 30 in the first terminal group does not overlap with the orthographic projection of any electrode terminal 30 in the second terminal group.

[0115] Optionally, all electrode terminals of the first terminal group are arranged in a row along the second direction Y, and all electrode terminals of the second terminal group are arranged in a row along the second direction Y. The first terminal group and the second terminal group are spaced apart along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0116] Optionally, the plurality of battery cells 6 in the first battery cell assembly 701 includes a plurality of first battery cells 601, and the plurality of battery cells 6 in the second battery cell assembly 702 includes a plurality of second battery cells 602. The plurality of first battery cells 601 and the plurality of second battery cells 602 are arranged in a one-to-one correspondence along a first direction X. The electrode terminal 30 of a corresponding first battery cell 601 facing a corresponding second battery cell 602 is spaced apart from the electrode terminal 30 of the second battery cell 602 facing the first battery cell 601 along a third direction Z.

[0117] The battery cell 6 has multiple electrode terminals 30, including a positive terminal and a negative terminal, which can be respectively located on two first walls 23.

[0118] In some examples, only the positive terminal of the first battery cell assembly 701 faces the second battery cell assembly 702, and all the positive terminals of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0119] In other examples, only the negative terminal of the first battery cell assembly 701 faces the second battery cell assembly 702, and all the negative terminals of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0120] In some other examples, a portion of the positive and a portion of the negative terminals of the first battery cell assembly 701 face the second battery cell assembly 702, and all the positive and all the negative terminals of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0121] Similarly, all the positive terminals of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group; or, all the negative terminals of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group; or, all the positive terminals and all the negative terminals of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group.

[0122] Along the first direction X, the first terminal group and the second terminal group do not overlap, which helps to reduce the risk of short circuit or even fire and explosion caused by the electrode terminals 30 of the first terminal group and the electrode terminals 30 of the second terminal group overlapping under extreme working conditions such as vibration and impact of the battery device 2, thereby improving the reliability of the battery device 2.

[0123] In some embodiments, refer to Figure 2 and Figure 4 The battery device 2 includes a plurality of first busbars 901, each of which is connected to the electrode terminals 30 of at least two battery cells 6 of the same battery cell assembly 7. A portion of the plurality of first busbars 901 is located between the first battery cell assembly 701 and the second battery cell assembly 702. Among the plurality of first busbars 901 located between the first battery cell assembly 701 and the second battery cell assembly 702, the first busbars 901 connecting the first battery cell assembly 701 and the first busbars 901 connecting the second battery cell assembly 702 are spaced apart along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0124] Optionally, in the battery cell assembly 7, the first busbar 901 connects the electrode terminals 30 of two adjacent battery cells 6.

[0125] In some examples, multiple battery cells 6 of the battery cell assembly 7 are connected in parallel. In the battery cell assembly 7, a portion of the first busbar 901 is connected to the positive terminals of two battery cells 6, and a portion of the first busbar 901 is connected to the negative terminals of two battery cells 6.

[0126] In other examples, multiple battery cells 6 of the battery cell assembly 7 are connected in series. In the battery cell assembly 7, a first busbar 901 connects the positive terminal of one battery cell 6 to the negative terminal of another battery cell 6.

[0127] Among the plurality of first busbars 901 located between the first battery cell assembly 701 and the second battery cell assembly 702, a portion of the first busbars 901 are connected to the electrode terminals 30 of at least two first battery cells 601, and another portion of the first busbars 901 are connected to the electrode terminals 30 of at least two second battery cells 602. The first busbars 901 connecting the first battery cells 601 and the first busbars 901 connecting the second battery cells 602 are spaced apart along a third direction Z.

[0128] Along the first direction X, the first busbar 901 connecting the first battery cell assembly 701 and the first busbar 901 connecting the second battery cell assembly 702 do not overlap. This helps to reduce the risk of short circuits or even fires and explosions caused by indirect connection between the first terminal group and the second terminal group through the first busbar 901 when the battery device 2 is under extreme conditions such as vibration and impact, thereby improving the reliability of the battery device 2.

[0129] In some embodiments, refer to Figure 5 Among the plurality of first busbar components 901 located between the first battery cell assembly 701 and the second battery cell assembly 702, the distance between the first busbar component 901 connecting the first battery cell assembly 701 and the first busbar component 901 connecting the second battery cell assembly 702 along the third direction Z is d, where d≥5mm.

[0130] Optionally, d can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, or 15mm, etc.

[0131] In this embodiment, d is set to be greater than or equal to 5mm, which is beneficial to increase the distance between the first busbar 901 connecting the first battery cell assembly 701 and the first busbar 901 connecting the second battery cell assembly 702 in the third direction Z, and further reduce the risk of the first terminal group and the second terminal group being connected by the first busbar 901 overlapping.

[0132] In some embodiments, refer to Figure 2 The battery device 2 includes a second busbar 902, which connects at least two battery cell assemblies 7.

[0133] Optionally, the second busbar 902 connects to the electrode terminal 30 of the outermost battery cell 6 in the second direction Y of the battery cell assembly 7.

[0134] In some examples, multiple battery cell assemblies 7 are connected in series. The second busbar 902 connects the positive terminal of one battery cell 6 of one battery cell assembly 7 to the negative terminal of one battery cell 6 of another battery cell assembly 7.

[0135] In other examples, multiple battery cell assemblies 7 are connected in parallel. A portion of the second busbar 902 connects the positive terminal of one battery cell 6 in one battery cell assembly 7 to the positive terminal of one battery cell 6 in another battery cell assembly 7. Another portion of the second busbar 902 connects the negative terminal of one battery cell 6 in one battery cell assembly 7 to the negative terminal of one battery cell 6 in another battery cell assembly 7.

[0136] In some embodiments, refer to Figure 10 The housing 20 includes a second wall 24 and a third wall 25 arranged along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. The second wall 24 is closer to the electrode terminal 30 than the third wall 25.

[0137] Optionally, there are two electrode terminals 30, each disposed on one of the two first walls 23. In the same plane perpendicular to the first direction X, the orthographic projections of the two electrode terminals 30 of the same battery cell 6 at least partially overlap. For example, the two electrode terminals 30 of the same battery cell 6 are arranged opposite each other along the first direction X.

[0138] Compared to the third wall 25, the electrode terminal 30 is closer to the second wall 24. Along the third direction Z, the electrode terminal 30 is offset toward the second wall 24. On the one hand, this helps to form a foolproof design and reduce the risk of reverse connection of the positive and negative terminals of the battery cell 6; on the other hand, the battery cells 6 of adjacent battery cell assemblies 7 can be arranged oppositely in the third direction Z, so that the electrode terminals 30 of adjacent battery cell assemblies 7 do not overlap in the first direction X, which helps to reduce the risk of overlap of the electrode terminals 30 of adjacent battery cell assemblies 7.

[0139] In some embodiments, refer to Figure 6 There are two electrode terminals 30, which are respectively disposed on two first walls 23. In the same plane perpendicular to the first direction X, the orthographic projections of the two electrode terminals 30 of the same battery cell 6 do not overlap.

[0140] Optionally, in the battery cell 6, the two electrode terminals 30 are completely offset along the third direction Z. The two electrode terminals 30 are biased toward the second wall 24 and the third wall 25, respectively.

[0141] The two electrode terminals 30 of the same battery cell 6 are staggered. During assembly, the position of the two electrode terminals 30 can be used to quickly determine the arrangement direction of the battery cell 6, improving assembly efficiency and reducing the risk of reversed positive and negative connections of the battery cell 6. The battery cells 6 of adjacent battery cell assemblies 7 do not need to be arranged in reverse, so that the electrode terminals 30 of adjacent battery cell assemblies 7 do not overlap in the first direction X, which helps to reduce the risk of electrode terminal overlap between adjacent battery cell assemblies 7.

[0142] In some embodiments, refer to Figure 5 and Figure 11 The battery cell 6 includes an electrode assembly 10 housed within the casing 20. The electrode assembly 10 includes a main body 11 and two tabs 12 connected to the main body 11, with opposite polarities. The first wall 23 includes a first wall portion 231, a second wall portion 232, and a first bend portion 233. Along the first direction X, the first wall portion 231 is closer to the main body 11 than the second wall portion 232. The first bend portion 233 connects to the first wall portion 231 and the second wall portion 232 at its two ends along the third direction Z, respectively. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Electrode terminals 30 are disposed on the first wall portion 231.

[0143] One of the two tabs 12 is the positive tab, and the other is the negative tab. There can be two electrode terminals 30, which are electrically connected to the two tabs 12 respectively. The electrode terminal 30 electrically connected to the positive tab is the positive terminal, and the electrode terminal 30 electrically connected to the negative tab is the negative terminal.

[0144] The first wall portion 231 and the second wall portion 232 are arranged along the third direction Z. The first bending portion 233 bends away from the main body portion 11 relative to the first wall portion 231, and the first bending portion 233 bends towards the main body portion 11 relative to the second wall portion 232.

[0145] As an example, refer to Figure 4 In the battery cell 6, the two first walls 23 are arranged in the same direction in the third direction Z. In other words, the first wall portions 231 and the second wall portions 232 of the two first walls 23 are arranged in the same direction. For example, the first wall portions 231 of both first walls 23 are connected to the second wall 24, and the second wall portions 232 of both first walls 23 are connected to the third wall 25. In the same plane perpendicular to the first direction X, the orthographic projections of the two electrode terminals 30 respectively provided on the two first wall portions 231 at least partially overlap.

[0146] As another example, see Figure 6In the battery cell 6, the two first walls 23 are arranged in opposite directions in the third direction Z. In other words, the first wall portions 231 and the second wall portions 232 of the two first walls 23 are arranged in opposite directions. For example, the first wall portions 231 of the two first walls 23 are respectively connected to the second wall 24 and the third wall 25, and the second wall portions 232 of the two first walls 23 are respectively connected to the third wall 25 and the second wall 24. In the same plane perpendicular to the first direction X, the orthographic projections of the two electrode terminals 30 respectively provided on the two first wall portions 231 do not overlap.

[0147] The first wall portion 231 is closer to the main body portion 11 than the second wall portion 232. The electrode terminals 30 located on the first wall portion 231 are also closer to the main body portion 11, which helps to increase the distance between the electrode terminals 30 and adjacent battery cell assemblies 7 in the first direction X, reducing the risk of overlap between the electrode terminals 30 and adjacent battery cell assemblies 7. The electrode terminals 30 located on the first wall portion 231 can also share a portion of the space in the first direction X with the second wall portion 232, which helps to improve space utilization and thus increase the energy density of the battery cell 6 and the battery device 2.

[0148] In some embodiments, refer to Figures 4 to 7 The arrangement direction of the first wall portion 231 and the second wall portion 232 of the first battery cell assembly 701 adjacent to the second battery cell assembly 702 is opposite to the arrangement direction of the second battery cell assembly 702 adjacent to the first wall portion 231 and the second wall portion 232 of the first battery cell assembly 701. In other words, the arrangement directions of the first wall portion 231 and the second wall portion 232 of the mutually adjacent first walls 23 of two adjacent battery cell assemblies 7 are opposite.

[0149] For example, in the first wall 23 of the first battery cell assembly 701 near the second battery cell assembly 702, the second wall portion 232 is closer to the bottom surface of the housing 5 than the first wall portion 231. In the first wall 23 of the second battery cell assembly 702 near the first battery cell assembly 701, the first wall portion 231 is closer to the bottom surface of the housing 5 than the second wall portion 232.

[0150] In the first battery cell assembly 701, the first wall portion 231 and the second wall portion 232 of each first battery cell 601 near the second battery cell assembly 702 are arranged in the same direction to facilitate connection of the electrode terminals 30 of adjacent first battery cells 601.

[0151] In the second battery cell assembly 702, the arrangement directions of each second battery cell 602 near the first wall portion 231 and the second wall portion 232 of the first battery cell assembly 701 are the same, so as to facilitate the connection of the electrode terminals 30 of the adjacent second battery cells 602.

[0152] For example, the third direction Z is parallel to the direction of gravity. In the first wall 23 of each first battery cell 601 near the second battery cell assembly 702, the first wall portion 231 is located above the second wall portion 232. In the first wall 23 of each second battery cell 602 near the first battery cell assembly 701, the first wall portion 231 is located below the second wall portion 232.

[0153] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of the first wall portion 231 of the first battery cell assembly 701 near the second battery cell assembly 702 does not overlap with the orthographic projection of the first wall portion 231 of the second battery cell assembly 702 near the first battery cell assembly 701. Under extreme conditions such as vibration and impact, this helps reduce the risk of the electrode terminals 30 of the first battery cell assembly 701 and the second battery cell assembly 702 overlapping.

[0154] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of the second wall portion 232 of the first battery cell assembly 701 near the second battery cell assembly 702 overlaps with the orthographic projection of the second wall portion 232 of the second battery cell assembly 702 near the first battery cell assembly 701. This helps to increase the spacing between the electrode terminals 30 of the first battery cell assembly 701 and the second battery cell assembly 702 that are close to each other in the third direction Z, reducing the risk of the electrode terminals 30 of the first battery cell assembly 701 and the second battery cell assembly 702 overlapping.

[0155] The first wall portion 231 and the second wall portion 232 of the first wall 23 of two adjacent battery cell assemblies 7 are arranged in opposite directions, which is beneficial to the mutual staggering and non-overlapping of the electrode terminals 30 of the two adjacent battery cell assemblies 7, thereby reducing the risk of the electrode terminals 30 of the two adjacent battery cell assemblies 7 overlapping.

[0156] In some embodiments, refer to Figure 5 The battery device 2 includes a plurality of first busbar components 901, each of which is connected to the electrode terminals 30 of at least two battery cells 6 of the same battery cell assembly 7. In the same plane perpendicular to the first direction X, the orthographic projection of the first busbar component 901 does not overlap with the orthographic projection of the second wall portion 232 of the battery cell 6 connected to the first busbar component 901.

[0157] Optionally, along the third direction Z, the first busbar component 901 is spaced apart from the second wall portion 232 of the battery cell 6 connected to the first busbar component 901.

[0158] Optionally, along the direction from the first wall portion 231 of the battery cell 6 to the second wall portion 232, a portion of the first wall portion 231 protrudes from the first busbar component 901 connected to the battery cell 6.

[0159] Along the first direction X, the first busbar component 901 does not overlap with the second wall portion 232 of the battery cell 6 connected to the first busbar component 901. During assembly, the first busbar component 901 is less likely to interfere with the second wall portion 232, which is beneficial to improving the connection strength and reliability between the first busbar component 901 and the electrode terminal 30.

[0160] In some embodiments, in the same plane perpendicular to the third direction Z, the orthographic projection of the first busbar 901 overlaps with the orthographic projection of the second wall portion 232 of the battery cell 6 connected to the first busbar 901.

[0161] In the first direction X, the second wall portion 232 has a second surface 2321 away from the main body portion 11, and the first busbar 901 has a third surface 9011 close to the first wall 23 of the battery cell 6 connected thereto. The third surface 9011 extends beyond the second surface 2321 in the direction from the first wall 23 to the first busbar 901.

[0162] The first busbar component 901 and the battery cell 6 connected to the first busbar component 901 can share part of the space in the first direction X, which is beneficial to improve space utilization and increase the energy density of the battery device 2.

[0163] In some embodiments, refer to Figures 4 to 8 The battery device 2 includes a connector 8 that connects at least a portion of the second wall 232 of the battery cell 6 in the battery cell assembly 7.

[0164] The connector 8 may or may not be connected to the housing 5. For example, the connector 8 may be separate from the housing 5 or may only be in contact with the housing 5.

[0165] The connector 8 is provided on one side of the battery cell assembly 7 along the first direction X, so as to connect the second wall portion 232 of the first wall 23.

[0166] Optionally, the connector 8 is plate-shaped. The connector 8 extends along the second direction Y to facilitate connection to at least a portion of the second wall portion 232 of the battery cell 6.

[0167] There can be one or more connectors 8.

[0168] When there are multiple battery cell modules 7, the connector 8 can connect only one battery cell module 7 or connect two adjacent battery cell modules 7.

[0169] The connection methods between the connector 8 and the second wall portion 232 include, but are not limited to, bonding and snap-fitting.

[0170] Optionally, connector 8 is an insulating component.

[0171] Along the direction from the main body 11 toward the first wall 23, the second wall 232 protrudes from the first wall 231. The connector 8 is connected to the second wall 232, which helps reduce the risk of interference between the connector 8 and the electrode terminals 30 or other components (e.g., the first busbar 901). At least some of the battery cells 6 of the battery cell assembly 7 can be connected together via the connector 8, which facilitates the grouping of these at least some battery cells 6 and improves the stability of the battery cell assembly 7.

[0172] In some embodiments, the battery cell assembly 7 is provided with connectors 8 on both sides along the first direction X.

[0173] The connector 8 located between two adjacent battery cell modules 7 can be connected to only one of the corresponding battery cell modules 7, or it can be connected to two adjacent battery cell modules 7.

[0174] For example, the first battery cell assembly 701 has connectors 8 on both sides along the first direction X, and the second battery cell assembly 702 has connectors 8 on both sides along the first direction X. There may be one connector 8 between the first battery cell assembly 701 and the second battery cell assembly 702. Alternatively, there may be multiple connectors 8 between the first battery cell assembly 701 and the second battery cell assembly 702, with multiple connectors 8 respectively connected to the first battery cell assembly 701 and the second battery cell assembly 702.

[0175] In this embodiment of the application, the connection between the connector 8 and the battery cell assembly 7 includes the connection between the connector 8 and at least a portion of the second wall portion 232 of the battery cell 6 in the battery cell assembly 7.

[0176] Both sides of the battery cell assembly 7 are provided with connectors 8. Multiple connectors 8 can connect multiple battery cells 6 of the battery cell assembly 7 on both sides in the first direction X, which helps to strengthen the structure of the battery cell assembly 7 on both sides in the first direction X and further improve the stability of the battery cell assembly 7.

[0177] In some embodiments, refer to Figure 7 and Figure 8 There are multiple connectors 8, including a first connector 801. In the first direction X, the first connector 801 is located between two adjacent battery cell assemblies 7 and connected to the battery cells 6 of the two battery cell assemblies 7.

[0178] Optionally, the first connector 801 is connected to the second wall portion 232 of each battery cell 6 of a battery cell assembly 7 along one side of the first direction X, and the first connector 801 is connected to the second wall portion 232 of each battery cell 6 of another battery cell assembly 7 along the other side of the first direction X.

[0179] In the same plane perpendicular to the first direction X, the orthographic projections of the second wall portions 232 of adjacent battery cell assemblies 7 on the adjacent side overlap. For example, in the third direction Z, the second wall portion 232 of the first battery cell assembly 701 adjacent to the second battery cell assembly 702 partially overlaps with the second wall portion 232 of the second battery cell assembly 702 adjacent to the first battery cell assembly 701. The first connector 801 connects to the overlapping portion of the second wall portions 232 of adjacent battery cell assemblies 7 on the adjacent side, which simplifies the structure of the first connector 801 and the connection between the first connector 801 and the second wall portion 232.

[0180] In this embodiment, the battery cells 6 of two adjacent battery cell assemblies 7 are connected by the first connector 801, which not only helps to reduce the number of connectors 8, save space in the battery device 2, and increase the energy density of the battery device 2, but also helps to improve the stability of multiple battery cell assemblies 7.

[0181] In some embodiments, refer to Figure 4 and Figure 7 There are multiple connectors 8, including a second connector 802, which is located between the housing 5 and the battery cell assembly 7 near the housing 5.

[0182] The second connector 802 can be connected to the housing 5, or it can be left unconnected to the housing 5.

[0183] The second connector 802 can fill the gap between the housing 5 and the battery cell assembly 7, thereby reducing the shaking amplitude that the battery cell assembly 7 may experience under vibration or impact conditions, and improving the stability and reliability of the battery cell assembly 7.

[0184] In some embodiments, the housing 5 includes two first beams 501 arranged along a first direction X. A second connector 802 is connected to the first beams 501, or the second connector 802 is integrally formed with the first beams 501.

[0185] The connection methods between the second connector 802 and the first beam 501 include, but are not limited to, bonding, snap-fitting, and screw connection.

[0186] The second connector 802 is integrally formed with the first beam 501. A portion of the housing 5 is connected to the battery cell assembly 7 and forms the second connector 802.

[0187] Optionally, a portion of the first busbar 901 is located between the first beam 501 and the battery cell assembly 7, and at least a portion of the second connector 802 protrudes from the surface of the first busbar 901 near the first beam 501, which helps to reduce the risk of interference between the first busbar 901 and the first beam 501.

[0188] The second connector 802 is connected to or integrally formed with the first beam 501, which helps to enhance the connection strength between the battery cell assembly 7 and the housing 5, and enhances the overall rigidity and stability of the battery device 2.

[0189] In some embodiments, refer to Figure 5 There are multiple connectors 8, including multiple third connectors 803. The multiple third connectors 803 are located between the first battery cell assembly 701 and the second battery cell assembly 702, and are respectively connected to the first battery cell assembly 701 and the second battery cell assembly 702. In other words, one third connector 803 is connected to only one battery cell assembly 7.

[0190] In some examples, the third connector 803 connected to the first battery cell assembly 701 and the third connector 803 connected to the second battery cell assembly 702 partially overlap in the first direction X. By overlapping different third connectors 803 in the first direction X, the spacing between the first terminal group and the second terminal group in the first direction X can be increased, improving the insulation isolation effect between the first terminal group and the second terminal group, which helps to further reduce the risk of overlap between the first terminal group and the second terminal group.

[0191] In other examples, the third connector 803 connected to the first battery cell assembly 701 and the third connector 803 connected to the second battery cell assembly 702 do not overlap in the first direction X. The third connector 803 connected to the first battery cell assembly 701 and the third connector 803 connected to the second battery cell assembly 702 at least partially overlap in the third direction Z. Different third connectors 803 can share at least a portion of the space in the first direction X, which is beneficial for improving space utilization and increasing the energy density of the battery device 2.

[0192] For example, the third connector 803 connected to the first battery cell assembly 701 and the third connector 803 connected to the second battery cell assembly 702 are arranged along the third direction Z. The third connector 803 connected to the first battery cell assembly 701 and the third connector 803 connected to the second battery cell assembly 702 are spaced apart along the third direction Z, or abut against each other, or connected to each other.

[0193] In some embodiments, refer to Figure 10 and Figure 11A first recess 234 is formed on the side of the first wall 23 near the main body 11, and the bottom surface of the first recess 234 corresponds to the second wall 232. The first recess 234 is recessed relative to the first surface 2311 of the first wall 231 facing the main body 11. At least portions of the two tabs 12 are located on both sides of the main body 11 along the first direction X. In the same plane perpendicular to the first direction X, the orthographic projection of the tab 12 near the first wall 23 lies within the orthographic projection of the first recess 234 of the first wall.

[0194] In some examples, the tab 12 is entirely located on the side of the main body 11 closest to the first wall 23. In other examples, a portion of the tab 12 is located on the side of the main body 11 closest to the first wall 23, while the other portion of the tab 12 is embedded within the main body 11.

[0195] The electrode terminal 30 located on the first wall 23 is electrically connected to the tab 12 located near the first wall 23.

[0196] Along the first direction X, the tab 12 near the first wall 23 does not overlap with the first wall portion 231 of the first wall 23, and there is no thickness overlap between the tab 12 and the first wall portion 231. Along the first direction X, the tab 12 near the first wall 23 overlaps with the first recess 234 of the first wall 23. The first recess 234 can provide a receiving space and / or a buffer space for the tab 12, reducing the squeezing effect on the tab 12 and reducing the risk of the tab 12 breaking.

[0197] In some embodiments, the tab 12 near the first wall 23 is partially accommodated within the first recess 234 of the first wall 23.

[0198] In this embodiment, the first recess 234 of the first wall 23 provides partial accommodating space for the tab 12 near the first wall 23. The tab 12 near the first wall 23 and the electrode terminal 30 disposed on the first wall 23 can share part of the space in the first direction X, reducing the extra space occupied by the tab 12, which is beneficial to improving the space utilization rate, increasing the energy density of the battery cell 6, and thus increasing the energy density of the battery device 2.

[0199] In some embodiments, refer to Figure 2 , Figure 10 and Figure 11The battery cell 6 includes two adapters 40, each adapter 40 connecting an electrode terminal 30 and a tab 12 located on the same side of the main body 11 along a first direction X. The adapter 40 includes a first adapter portion 41, a second adapter portion 42, and a third adapter portion 43. The two ends of the third adapter portion 43 along a third direction Z are respectively connected to the first adapter portion 41 and the second adapter portion 42. The first adapter portion 41 is located between the main body 11 and a first wall 23 and connects to the electrode terminal 30 disposed on the first wall 23. At least a portion of the second adapter portion 42 is accommodated in a first recess 234 of the first wall 23 and connects to the tab 12 near the first wall 23.

[0200] An adapter 40 is disposed between the main body 11 and a first wall 23, and connects the tab 12 near the first wall 23 and the electrode terminal 30 disposed on the first wall 23. Another adapter 40 is disposed between the main body 11 and another first wall 23, and connects the tab 12 near the other first wall 23 and the electrode terminal 30 disposed on the other first wall 23.

[0201] In some examples, a portion of the tab 12 is located on the side of the second adapter 42 opposite to the second wall portion 232 and is connected to the second adapter 42. In other examples, a portion of the tab 12 is located on the side of the second adapter 42 close to the second wall portion 232 and is connected to the second adapter 42.

[0202] The third transition portion 43 is bent relative to the first transition portion 41 and the second transition portion 42. Optionally, the bending trend of the third transition portion 43 is the same as that of the first bending portion 233. The third transition portion 43 is located on the side of the first bending portion 233 near the main body portion 11, the first transition portion 41 is located on the side of the first wall portion 231 near the main body portion 11, and the second transition portion 42 is located on the side of the second wall portion 232 near the main body portion 11. The shape of the transition member 40 is adapted to the first wall 23, which helps to reduce the gap between them and improve space utilization.

[0203] The connection methods between the second adapter 42 and the tab 12, and between the first adapter 41 and the electrode terminal 30, include, but are not limited to, welding and bonding. Optionally, the second adapter 42 is welded to the tab 12 by ultrasonic or laser welding. The first adapter 41 is welded to the electrode terminal 30 by ultrasonic or laser welding.

[0204] The second adapter 42 is at least partially accommodated in the first recess 234. At least a portion of the first wall portion 231 of the first wall 23 protrudes from the surface of the second adapter 42 facing the main body 11 in the direction of the first wall 23 near the adapter 40, so that the first recess 234 still has space for accommodating the tab 12.

[0205] The embodiments of this application can achieve electrical connection between the tab 12 and the electrode terminal 30 located on the same side of the main body 11 through the adapter 40, and can also achieve spatial sharing between the tab 12 and the electrode terminal 30 located on the same side of the main body 11 in the first direction X.

[0206] In some embodiments, refer to Figure 2 , Figures 10 to 16 A first recess 234 is formed on the side of the first wall 23 near the main body 11, and the bottom surface of the first recess 234 corresponds to the second wall 232. The first recess 234 is recessed relative to the first surface 2311 of the first wall 231 facing the main body 11. At least portions of the two tabs 12 are located on both sides of the main body 11 along the first direction X. The battery cell 6 includes two first insulating members 50, which are respectively disposed between the main body 11 and the two first walls 23, and portions of the two tabs 12 are located on the side of the two first insulating members 50 away from the main body 11. In the same plane perpendicular to the first direction X, the orthographic projection of the first insulating member 50 near the first wall 23 is located within the orthographic projection of the first recess 234 of the first wall 23, and at least a portion of the first insulating member 50 near the first wall 23 is accommodated within the first recess 234 of the first wall 23.

[0207] Optionally, the first insulating member 50 near the first wall 23 and the electrode terminal 30 disposed on the first wall 23 are arranged along the third direction Z. In the same plane perpendicular to the third direction Z, the orthographic projection of the electrode terminal 30 disposed on the first wall 23 and the orthographic projection of the first recess 234 near the first wall 23 partially overlap.

[0208] The first recess 234 can provide at least a partial accommodating space for the first insulating member 50. The electrode terminal 30 disposed on the first wall portion 231 can share a portion of the space in the first direction X with the first recess 234, thereby sharing a portion of the space in the first direction X with the first insulating member 50, which is beneficial to improve space utilization, increase the energy density of the battery cell 6, and thus increase the energy density of the battery device 2.

[0209] In some embodiments, in the same plane perpendicular to the third direction Z, the orthographic projections of the first adapter 41 and the first insulator 50 located on the same side of the main body 11 at least partially overlap. The first adapter 41 and the first insulator 50 can share at least a portion of the space in the first direction X, which is beneficial to improving space utilization and saving the extra space occupied by the first adapter 41, thereby increasing the energy density of the battery cell 6 and the energy density of the battery device 2.

[0210] In some embodiments, refer to Figure 11 , Figure 14 and Figure 16The tab 12 includes a folding portion 121, a second bending portion 122, and a connecting portion 123. The folding portion 121 is connected to the main body portion 11, and the connecting portion 123 is located on the side of the first insulating member 50 opposite to the main body portion 11 and connected to the adapter 40. The second bending portion 122 connects the folding portion 121 and the connecting portion 123 and bends relative to the folding portion 121 and the connecting portion 123. In the same plane perpendicular to the first direction X, the orthographic projection of the end of the connecting portion 123 away from the second bending portion 122 lies within the orthographic projection of the first insulating member 50.

[0211] The tab 12 includes multiple tab layers, and the portions of the multiple tab layers that converge with each other form a convergence portion 121. The convergence portion 121 is located on the side of the first insulating member 50 near the main body portion 11.

[0212] Optionally, the connecting portion 123 is attached to and welded to the adapter 40. For example, the connecting portion 123 is laser welded to the second adapter 42.

[0213] One end of the second bend 122 is connected to the gathering part 121, and the other end is connected to the connecting part 123. The second bend 122 extends through or around the first insulating member 50 to the connecting part 123.

[0214] Optionally, a portion of the second bend 122 may be located on the side of the first insulating member 50 away from the main body 11, or the second bend 122 may not be located entirely on the side of the first insulating member 50 away from the main body 11.

[0215] Along the first direction X, the end of the connecting portion 123 away from the second bend 122 overlaps with the first insulating member 50. The first insulating member 50 separates the end of the connecting portion 123 away from the second bend 122 from the main body portion 11, which helps to restrict the movement of the end of the connecting portion 123 away from the second bend 122 toward the main body portion 11 and reduces the risk of short circuit caused by the insertion of the connecting portion 123 into the main body portion 11.

[0216] In some embodiments, refer to Figure 14 and Figure 15 The first insulating member 50 includes an insulating body 52 and a first sidewall 53. A portion of the tab 12 near the first insulating member 50 is located on the side of the insulating body 52 away from the main body portion 11. The first sidewall 53 is connected to the side of the insulating body 52 along the second direction Y. At least a portion of the first sidewall 53 is received in a first recess 234.

[0217] The insulating body 52 is located between the main body portion 11 and the first wall 23 near the first insulating member 50. Optionally, the insulating body 52 is located between the main body portion 11 and the second wall portion 232.

[0218] The first sidewall 53 can share at least part of the space in the first direction X with the electrode terminal 30, which is beneficial to improving space utilization.

[0219] In some embodiments, the first insulating member 50 includes a second sidewall 55 connected to one side of the insulating body 512 along the third direction Z. At least a portion of the second sidewall 55 is accommodated in the first recess 234. At least a portion of the second sidewall 55 shares a portion of the space in the first direction X with the electrode terminal 30, which is beneficial for improving space utilization.

[0220] In some embodiments, refer to Figure 14 and Figure 15 The first insulating member 50 is provided with an opening 51, and the two tabs 12 are respectively inserted through the openings 51 of the two first insulating members 50.

[0221] Optionally, the second bends 122 of the two tabs 12 are respectively inserted through the openings 51 of the two first insulating members 50, and the second bends 122 of the two tabs 12 are respectively partially accommodated in the openings 51 of the two first insulating members 50. A portion of the second bend 122 may be located on the side of the first insulating member 50 away from the main body 11, so as to facilitate connection with the connecting portion 123.

[0222] Optionally, the opening 51 is provided in the insulating body 52. ​​The insulating body 52 includes two insulator portions 521 spaced apart, and the opening 51 is located between the two insulator portions 521. Optionally, the two insulator portions 521 are spaced apart along the second direction Y. The opening 51 is located at the middle of the insulating body 52 along the second direction Y.

[0223] Multiple tab layers of the tab 12 can converge toward the opening 51, forming a converged portion 121 that is triangular in shape. Each insulator portion 521 gradually tilts away from the main body portion 11 in a direction close to another insulator portion 521. The two insulator portions 521 are tilted to avoid the converged portion 121.

[0224] The tab 12 is inserted through the opening 51, which helps to improve the constraint and restriction effect of the first insulating member 50 on the tab 12 and reduce the risk of short circuit caused by the insertion of the tab 12 into the main body 11.

[0225] In some embodiments, refer to Figure 16 The battery cell 6 includes two electrode assemblies 10 stacked along a second direction Y. In the second direction Y, a first insulating member 50 is located between tabs 12 on the same side of the two electrode assemblies 10.

[0226] The tabs 12 on the same side of the two electrode assemblies 10 refer to the tabs 12 on the same side of the two electrode assemblies 10 in the first direction X. The tabs 12 on the same side of the two electrode assemblies 10 have the same polarity so as to connect to the same adapter 40.

[0227] The tabs 12 on the same side of the two electrode assemblies 10 can be retracted toward the first insulating member 50 along the second direction Y. A portion of the tabs 12 on the same side of the two electrode assemblies 10 are folded from the first insulating member 50 along the second direction Y to the side of the first insulating member 50 away from the main body 11.

[0228] Optionally, the connecting portions 123 of the tabs 12 on the same side of the two electrode assemblies 10 are folded from both sides of the first insulating member 50 along the second direction Y to the side of the first insulating member 50 away from the main body portion 11. The first insulating member 50 is located between the second bent portions 122 of the tabs 12 on the same side of the two electrode assemblies 10.

[0229] The first insulating member 50 is plate-shaped. The first insulating member 50 includes two inclined surfaces, which are inclined towards both sides of the first insulating member 50 along the second direction Y, gradually moving away from the main body 11, so as to avoid the closing portion 121 of the tab 12 on the same side of the two electrode assemblies 10.

[0230] The first insulating member 50 can simultaneously separate a portion of the tabs 12 on the same side of the two electrode assemblies 10 from the main body 11, reducing the risk of short circuit caused by inserting the tabs 12 on the same side of the two electrode assemblies 10 into the main body 11, and also helps to simplify the internal structure of the battery cell 6.

[0231] In some embodiments, refer to Figure 17 and Figure 18 The first insulating element 50 is connected to the second wall portion 232.

[0232] In some examples, along the direction of the main body 11 toward the first wall 23 near the first insulator 50, a portion of the first insulator 50 protrudes from the tab 12, and the portion of the first insulator 50 protruding from the tab 12 is connected to the second wall 232.

[0233] In other examples, a portion of the second wall portion 232 protrudes from the tab 12 along the direction from the first wall 23 near the first insulator 50 toward the main body portion 11, and the portion of the second wall portion 232 protruding from the tab 12 is connected to the first insulator 50.

[0234] The connection between the first insulating member 50 and the second wall portion 232 includes, but is not limited to, snap-fitting and bonding.

[0235] The first insulating member 50 is connected to the second wall portion 232. The second wall portion 232 can improve the structural stability of the first insulating member 50, reduce the possibility of the first insulating member 50 shaking or shifting, reduce the risk of the first insulating member 50 pulling the tab 12, and help improve the connection stability between the tab 12 and the adapter 40, thereby improving the insulation and isolation effect of the first insulating member 50.

[0236] In some embodiments, the second wall portion 232 includes a first snap-fit ​​portion 2322, and the first insulating member 50 includes a second snap-fit ​​portion 54, wherein the first snap-fit ​​portion 2322 snaps onto the second snap-fit ​​portion 54.

[0237] Optionally, one of the first latching part 2322 and the second latching part 54 is a latch, and the other is a slot.

[0238] In some examples, refer to Figure 18 The first latching portion 2322 is a buckle, and the second latching portion 54 is a slot. The second latching portion 54 is located on the side of the second wall portion 232 facing the main body portion 11. Along the direction of the main body portion 11 toward the first wall 23 near the first insulating member 50, at least a portion of the first latching portion 2322 protrudes from the tab 12 so as to engage with the second latching portion 54.

[0239] In other examples, the first snap-fit ​​portion 2322 is a slot and the second snap-fit ​​portion 54 is a buckle. Along the direction from the first wall 23 near the first insulator 50 toward the main body portion 11, at least a portion of the second snap-fit ​​portion 54 protrudes from the fifth surface 12a of the tab 12 away from the main body portion 11 so as to snap into the first snap-fit ​​portion 2322.

[0240] The first insulating member 50 and the second wall portion 232 are connected by the snap-fit ​​of the first snap-fit ​​portion 2322 and the second snap-fit ​​portion 54, which helps to simplify the connection method and improve assembly efficiency.

[0241] In some embodiments, refer to Figures 17 to 19 The second wall portion 232 includes a first base portion 2323 and a first insulating portion 2324 that are interconnected. The first base portion 2323 is located on the side of the first insulating portion 2324 away from the electrode assembly 10. The first engaging portion 2322 is a snap-fit, protruding from the fifth surface 12a of the tab 12 away from the main body portion 11 along the direction from the first wall portion 23 to the main body portion 11. The second engaging portion 54 is a slot.

[0242] The connection methods between the first base 2323 and the first insulating part 2324 include, but are not limited to, bonding and snap-fitting.

[0243] Optionally, the material of the first base 2323 may include metal, which is beneficial to improving the structural strength of the first wall 23, reducing its deformation risk, and also beneficial to connecting the first wall 23 to other walls of the outer shell 20 by welding, thereby improving the connection strength.

[0244] Optionally, the first insulating portion 2324 may be made of plastic, which is beneficial for insulatingly separating the first base 2323 from other structures within the housing 20.

[0245] Optionally, the second snap-fit ​​portion 54 may be provided on the side of the second sidewall 55 away from the main body portion 11.

[0246] In some embodiments, refer to Figures 17 to 19 The battery cell 6 includes a second insulating member 70, which covers the main body 11. A portion of the second insulating member 70 is connected to the first insulating member 50, and another portion of the second insulating member 70 is connected to the first wall portion 231.

[0247] Optionally, the second insulating element 70 includes an insulating film.

[0248] The connection methods between the second insulating member 70 and the first insulating member 50, and between the second insulating member 70 and the first wall portion 231, include, but are not limited to, heat fusion and bonding.

[0249] A portion of the second insulating member 70 near the first wall 23 may be disposed on the outer periphery of the first insulating member 50 and connected to the first insulating member 50. Another portion of the second insulating member 70 near the first wall 23 may be disposed on the outer periphery of the first wall portion 231 and connected to the first wall portion 231.

[0250] Optionally, the first wall portion 231 includes a second base portion 2313 and a second insulating portion 2314, wherein the second base portion 2313 is disposed on the side of the second insulating portion 2314 away from the main body portion 11. A portion of the second insulating member 70 may be connected to the second insulating portion 2314.

[0251] Optionally, the first bent portion 235 includes a third base portion 2333 and a third insulating portion 2334, with the third base portion 2333 disposed on the side of the third insulating portion 2334 away from the main body portion 11. The first base portion 2323, the second base portion 2313, and the third base portion 2333 are integrally formed, as are the first insulating portion 2324, the second insulating portion 2314, and the third insulating portion 2334.

[0252] The second insulating member 70 is partially connected to the first insulating member 50 and partially connected to the first wall portion 231, which helps to improve the stability of the first insulating member 50 relative to the main body portion 11 and the first insulating member 50 relative to the first wall 23, thereby reducing the risk of the first insulating member 50 shaking or shifting and improving the insulation protection effect.

[0253] In some embodiments, refer to Figure 3 The first recess 234 extends to the edge of the first wall 23 on at least one side in the second direction Y. This is beneficial for increasing the size of the first recess 234 in the second direction Y, thereby providing greater accommodation space for the first insulator 50, the tab 12 and / or the adapter 40, and reducing the risk of interference.

[0254] In some examples, only one side of the first recess 234 in the second direction Y of the first wall 23 extends to the edge of the first wall 23, and that side of the first recess 234 is open.

[0255] In other examples, the first recess 234 extends to the two edges of the first wall 23 on both sides in the second direction Y. The first recess 234 penetrates the first wall 23 along the second direction Y.

[0256] In some embodiments, refer to Figure 12 The outer casing 20 includes two fourth walls 26 arranged along the second direction Y. At least one fourth wall 26 includes a wall body 261 and a protrusion 262. The wall body 261 is connected to the first wall portion 231, and the protrusion 262 protrudes from the wall body 261 along the first direction X and is connected to the second wall portion 232.

[0257] In some examples, only one side of the first recess 234 extends to the edge of the first wall 23 in the second direction Y, and only one fourth wall 26 corresponding to this side includes a wall body 261 and a protrusion 262, the wall body 261 and the protrusion 262 being connected to the edge of the first wall portion 231 and the edge of the second wall portion 232 on that side, respectively. Another fourth wall 26 may be integrally connected to the first wall portion 231.

[0258] In other examples, the first recess 234 extends to the two edges of the first wall 23 on both sides in the second direction Y. Both fourth walls 26 include a wall body 261 and a protrusion 262. The wall bodies 261 of the two second walls 27 are respectively connected to the two edges of the first wall portion 231 in the second direction Y, and the protrusions 262 of the two second walls 27 are respectively connected to the two edges of the second wall portion 232 in the second direction Y.

[0259] Optionally, the fourth wall 26 includes two protrusions 262, which are respectively connected to both sides of the wall body 261 along the first direction X.

[0260] At least one fourth wall 26, by providing a protrusion 262, can not only adapt to the shape of the first wall 23 so as to be directly connected to the first wall 23, but also increase the distance between the central region of the fourth wall 26 and the connection position of the fourth wall 26 and the first wall 23, reducing the risk of the connection position being weakened or even cracked due to the expansion and contraction of the battery cell 6.

[0261] In some embodiments, refer to Figures 4 to 6 The battery device 2 includes a third insulating member 201, which is located between two adjacent battery cell assemblies 7.

[0262] Optionally, two connectors 8 are provided between two adjacent battery cell assemblies 7, and the two connectors 8 are respectively connected to the two battery cell assemblies 7. Along the first direction X, a third insulating member 201 is provided between the two connectors 8.

[0263] The third insulating component 201 can further enhance the insulation effect between two adjacent battery cell components 7, which helps to further reduce the risk of overlap between the first terminal group and the second terminal group.

[0264] In some embodiments, the housing 20 includes a housing 21 and two end caps 22. The housing 21 has two housing openings 211, and the two end caps 22 respectively cover the two housing openings 211. The two first walls 23 are the two end caps 22. This simplifies the assembly of the battery cell 6.

[0265] Optionally, each end cap 22 includes an end cap body and a third insulating member. The third insulating member is disposed on the side of the end cap body near the main body 11 and is connected to the end cap body. The housing 21 is connected to the two end cap bodies at both ends along the first direction X.

[0266] This application also provides an electrical device, which includes a battery device 2 provided in any embodiment of this application. The battery device 2 is used to provide electrical energy.

[0267] The battery device 2 provided in this application embodiment includes a housing 5, a plurality of battery cell assemblies 7, and a plurality of first busbars 901. The plurality of battery cell assemblies 7 are housed within the housing 5 and arranged along a first direction X. Each battery cell assembly 7 includes a plurality of battery cells 6 stacked along a second direction Y. The first busbars 901 connect the electrode terminals 30 of at least two battery cells 6 within the same battery cell assembly 7. Each battery cell 6 includes a housing 20 and a plurality of electrode terminals 30. The housing 20 includes two first walls 23 arranged along the first direction X. Each first wall 23 includes a first wall portion 231, a second wall portion 232, and a first bend portion 233. Along the first direction X, the first wall portion 231 is closer to the main body 11 than the second wall portion 232. The first bend portion 233 connects to the first wall portion 231 and the second wall portion 232 at its two ends along a third direction Z, respectively. The first wall portions 231 of both first walls 23 are provided with electrode terminals 30. The plurality of battery cell assemblies 7 include adjacent first battery cell assemblies 701 and second battery cell assemblies 702. All electrode terminals 30 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group. All electrode terminals 30 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group. In the same plane perpendicular to the first direction X, the orthographic projections of the first terminal group and the second terminal group do not overlap. A portion of a plurality of first busbars 901 are located between the first battery cell assembly 701 and the second battery cell assembly 702. Among the plurality of first busbars 901 located between the first battery cell assembly 701 and the second battery cell assembly 702, the first busbar 901 connecting the first battery cell assembly 701 and the first busbar 901 connecting the second battery cell assembly 702 are spaced apart along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0268] 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; as well as Multiple battery cell assemblies are housed within the housing and arranged along a first direction. Each battery cell assembly includes multiple battery cells stacked along a second direction, which is perpendicular to the first direction. Each battery cell includes a housing and multiple electrode terminals. The housing includes two first walls arranged along the first direction, and the multiple electrode terminals are disposed on the first walls. The plurality of battery cell assemblies include a first battery cell assembly and a second battery cell assembly arranged adjacent to each other. All the electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all the electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group. In the same plane perpendicular to the first direction, the orthographic projection of the first terminal group and the orthographic projection of the second terminal group do not overlap.

2. The battery device according to claim 1, characterized in that, The battery device includes a plurality of first busbars, each first busbar being connected to the electrode terminals of at least two of the battery cells of the same battery cell assembly, and a portion of the plurality of first busbars being located between the first battery cell assembly and the second battery cell assembly; Among the plurality of first busbars located between the first battery cell assembly and the second battery cell assembly, the first busbars connecting the first battery cell assembly and the first busbars connecting the second battery cell assembly are spaced apart along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery device according to claim 2, characterized in that, Among the plurality of first busbars located between the first battery cell assembly and the second battery cell assembly, the distance between the first busbar connecting the first battery cell assembly and the first busbar connecting the second battery cell assembly along the third direction is d, where d ≥ 5 mm.

4. The battery device according to any one of claims 1-3, characterized in that, The battery cell includes a second wall and a third wall arranged along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The second wall is closer to the electrode terminal than the third wall.

5. The battery device according to any one of claims 1-3, characterized in that, There are two electrode terminals, and the two electrode terminals are respectively disposed on the two first walls; In the same plane perpendicular to the first direction, the orthographic projections of the two electrode terminals of the same battery cell do not overlap.

6. The battery device according to any one of claims 1-5, characterized in that, The battery cell includes an electrode assembly housed within the housing. The electrode assembly includes a main body and two tabs connected to the main body, the two tabs having opposite polarities. The first wall includes a first wall portion, a second wall portion, and a bent portion. Along the first direction, the first wall portion is closer to the main body portion than the second wall portion. The two ends of the bent portion along the third direction are respectively connected to the first wall portion and the second wall portion. The first direction, the second direction, and the third direction are perpendicular to each other. The electrode terminals are located on the first wall portion.

7. The battery device according to claim 6, characterized in that, The arrangement direction of the first battery cell assembly near the first wall portion and the second wall portion of the second battery cell assembly is opposite to the arrangement direction of the second battery cell assembly near the first wall portion and the second wall portion of the first battery cell assembly.

8. The battery device according to claim 6 or 7, characterized in that, The battery device includes a plurality of first busbars, the first busbars being connected to the electrode terminals of at least two of the battery cells of the same battery cell assembly; In the same plane perpendicular to the first direction, the orthographic projection of the first busbar component does not overlap with the orthographic projection of the second wall portion of the battery cell connected to the first busbar component.

9. The battery device according to claim 8, characterized in that, In the same plane perpendicular to the third direction, the orthographic projection of the first busbar overlaps with the orthographic projection of the second wall portion of the battery cell connected to the first busbar.

10. The battery device according to any one of claims 6-9, characterized in that, The battery device includes a connector that connects to at least a portion of the second wall of the battery cell assembly.

11. The battery device according to claim 10, characterized in that, The battery cell assembly has the connectors on both sides along the first direction.

12. The battery device according to claim 10 or 11, characterized in that, The connectors are multiple, and the multiple connectors include a first connector. In the first direction, the first connector is located between two adjacent battery cell assemblies and connected to the battery cells of the two battery cell assemblies.

13. The battery device according to any one of claims 10-12, characterized in that, There are multiple connectors, including a second connector, which is disposed between the housing and the battery cell assembly near the housing.

14. The battery device according to claim 13, characterized in that, The box body includes two first beams arranged along the first direction; The second connector is connected to the first beam, or the second connector is integrally formed with the first beam.

15. The battery device according to any one of claims 6-14, characterized in that, A first recess is formed on the side of the first wall near the main body portion, the bottom surface of the first recess corresponds to the second wall portion, and the first recess is recessed relative to the first surface of the first wall portion facing the main body portion; At least portions of the two tabs are located on both sides of the main body along the first direction. In the same plane perpendicular to the first direction, the orthographic projection of the tab closest to the first wall is located within the orthographic projection of the first recess of the first wall.

16. The battery device according to claim 15, characterized in that, The tabs near the first wall are partially accommodated within the first recess of the first wall.

17. The battery device according to claim 15 or 16, characterized in that, The battery cell includes two adapters, each adapter connecting the electrode terminal and the tab located on the same side of the main body along the first direction; The adapter includes a first adapter part, a second adapter part, and a third adapter part, wherein the two ends of the third adapter part are respectively connected to the first adapter part and the second adapter part along the third direction; The first adapter is located between the main body and a first wall and is connected to the electrode terminal disposed on the first wall. At least a portion of the second adapter is accommodated in the first recess of the first wall and is connected to the tab near the first wall.

18. The battery device according to any one of claims 6-17, characterized in that, A first recess is formed on the side of the first wall near the main body portion, the bottom surface of the first recess corresponds to the second wall portion, and the first recess is recessed relative to the first surface of the first wall portion facing the main body portion; At least portions of the two electrodes are respectively located on both sides of the main body along the first direction; The battery cell includes two first insulating members, which are respectively disposed between the main body and the two first walls, and a portion of each of the two tabs is located on the side of the two first insulating members away from the main body. In the same plane perpendicular to the first direction, the orthographic projection of the first insulating member near the first wall lies within the orthographic projection of the first recess of the first wall, and at least a portion of the first insulating member near the first wall is accommodated within the first recess of the first wall.

19. The battery device according to claim 18, characterized in that, The first insulating member includes an insulating body and a first sidewall. A portion of the tab near the first insulating member is located on the side of the insulating body away from the body portion. The first sidewall is connected to one side of the insulating body along the second direction. At least a portion of the first sidewall is received in the first recess.

20. The battery device according to claim 18 or 19, characterized in that, The first insulating member has an opening, and the two tabs are respectively inserted through the two openings of the first insulating member.

21. The battery device according to claim 18 or 19, characterized in that, The battery cell includes two electrode assemblies stacked along the second direction; In the second direction, the first insulating member is located between the tabs on the same side of the two electrode assemblies.

22. The battery device according to any one of claims 18-21, characterized in that, The first insulating element is connected to the second wall portion.

23. The battery device according to claim 22, characterized in that, The second wall portion includes a first snap-fit ​​portion, and the first insulating member includes a second snap-fit ​​portion, wherein the first snap-fit ​​portion snaps into the second snap-fit ​​portion.

24. The battery device according to claim 23, characterized in that, The second wall portion includes a first base portion and a first insulating portion that are interconnected, wherein the first base portion is located on the side of the first insulating portion away from the electrode assembly; The first insulating part includes the first snap-fit ​​part, which is a buckle and protrudes from the fifth surface of the electrode tab away from the main body. The second snap-fit ​​part is a slot.

25. The battery device according to any one of claims 18-24, characterized in that, The battery cell includes a second insulating member that covers the main body portion. A portion of the second insulating member is connected to the first insulating member, and another portion of the second insulating member is connected to the first wall portion.

26. The battery device according to any one of claims 15-25, characterized in that, The first recess extends to the edge of the first wall on at least one side in the second direction.

27. The battery device according to any one of claims 6-26, characterized in that, The outer casing includes two fourth walls arranged along the second direction, at least one of the fourth walls including a wall body and a protrusion, the wall body being connected to the first wall portion, and the protrusion protruding from the wall body along the first direction and being connected to the second wall portion.

28. The battery device according to any one of claims 1-27, characterized in that, The battery device includes a third insulating element located between two adjacent battery cell assemblies.

29. The battery device according to any one of claims 1-28, characterized in that, The outer casing includes a housing and two end caps. The housing has two housing openings, and the two end caps respectively cover the two housing openings. The two first walls are the two end caps.

30. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1-29, the battery device being used to provide electrical energy.

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