Battery device, battery cell, power utilization device and energy storage device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery device, a battery monomer, a power utilization device and an energy storage device, the battery device comprises a battery monomer assembly and a confluence component, the battery monomer assembly comprises a plurality of battery monomers, and two adjacent battery monomers are electrically connected through the confluence component. The battery monomer comprises a shell, an electrode assembly and an electrode terminal, wherein the electrode assembly is arranged in the shell. The electrode terminal is arranged on the first wall of the shell in an insulating mode in the first direction, a mounting groove is formed in the side, away from the electrode assembly, of the electrode terminal in the first direction, and part of the confluence component is inserted into the mounting groove and electrically connected with the electrode terminal. Therefore, at least part of the electrode terminal and the confluence component can share the space in the first direction, and the space occupied by the battery monomer and the confluence component in the first direction is reduced under the condition that the size of the battery monomer in the first direction is predetermined, so that the utilization rate of the internal space of the battery device in the first direction is improved; therefore, the energy density of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more particularly relates to a battery device, a battery monomer, a power utilization device and an energy storage device. BACKGROUND

[0002] From the development of market situation, the application of the battery device is more and more extensive. The battery device is not only applied to energy storage systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace and many other fields. With the continuous expansion of the application field of the battery device, the market demand is also increasing. And the capacity of the battery device is getting larger and larger, and the performance requirement of the battery device is getting higher and higher.

[0003] In some cases, the space utilization of the internal space of the battery device is low, which affects the energy density of the battery device. UTILITY MODEL CONTENT

[0004] In view of the above problems, the application embodiment provides a battery device, a battery monomer, a power utilization device and an energy storage device, which can improve the energy density of the battery device.

[0005] In the first aspect, the application embodiment provides a battery device, comprising a battery monomer assembly and a busbar component, the battery monomer assembly comprising a plurality of battery monomers, and two adjacent battery monomers being electrically connected through the busbar component; the battery monomer comprises:

[0006] a shell;

[0007] an electrode assembly arranged in the shell;

[0008] an electrode terminal arranged on a first wall of the shell in an insulating manner, the electrode terminal being provided with a mounting groove on a side thereof away from the electrode assembly in a first direction, and a part of the busbar component being inserted into the mounting groove and electrically connected with the electrode terminal.

[0009] The battery device provided by the application embodiment is provided with a mounting groove on the end of the electrode terminal away from the electrode assembly in the first direction, and a part of the busbar component is inserted into the mounting groove, so that at least part of the electrode terminal and the busbar component can share space in the first direction. In this way, under the condition that the size of the battery monomer in the first direction is predetermined, the space occupied by the whole composed of the battery monomer and the busbar component in the first direction is reduced, thereby improving the utilization rate of the internal space of the battery device in the first direction, and improving the energy density of the battery device.

[0010] In some embodiments, one end of the mounting groove in a second direction is provided with a slot, the busbar component extends to the outside of the electrode terminal through the slot, and the first direction and the second direction intersect.

[0011] In this way, the busbar can extend out of the electrode terminal through the slot, and thus be electrically connected to the electrode terminal of the adjacent battery cell. In this way, the part of the busbar extending out of the mounting groove in the second direction can also share space with the electrode terminal in the first direction, thus helping to further improve the utilization of the internal space of the battery device in the first direction, and thus improve the energy density of the battery device.

[0012] In some embodiments, the electrode terminal protrudes out of the first wall in the first direction, and the slot is provided on the part of the electrode terminal protruding out of the first wall in the first direction.

[0013] In this way, the part of the busbar extending out of the mounting groove in the second direction is located on the side of the first wall away from the electrode assembly in the first direction. In this way, the design of the shell is simplified, thus simplifying the structure of the battery cell.

[0014] In some embodiments, the first wall is provided with an electrode lead-out hole penetrating through in the first direction, and at least part of the electrode terminal is inserted into the electrode lead-out hole.

[0015] The shell is provided with a second wall in the second direction, and the second wall is provided with a first groove penetrating through in the second direction. The first groove is distributed and communicated with the slot in the second direction, and part of the busbar is located in the first groove.

[0016] In this way, the part of the busbar extending out of the mounting groove in the second direction is inserted into the slot and the first groove, so that the busbar also shares space with the second wall in the first direction. In this way, the size of the whole in the first direction composed of the battery cell and the busbar is reduced, thus further improving the utilization of the internal space of the battery device in the first direction, and thus improving the energy density of the battery device.

[0017] In some embodiments, the first groove and the electrode lead-out hole are distributed and communicated in the second direction.

[0018] In this way, the busbar can be inserted into the mounting groove, the slot and the first groove in the first direction, thus facilitating the installation of the busbar on the battery cell.

[0019] In some embodiments, the battery cell further comprises an insulating structure, at least part of the insulating structure is located in the electrode lead-out hole and surrounds the outer periphery of the electrode terminal. The insulating structure comprises a first insulating part provided between the second wall and the electrode terminal, and the first insulating part is provided with a second groove communicated between the slot and the first groove, and part of the busbar is located in the second groove.

[0020] In this way, the arrangement of the busbar can avoid the insulating structure, thus facilitating the sharing of space between the busbar and the battery cell in the first direction, and thus improving the energy density of the battery device.

[0021] In some embodiments, the electrode terminal and the busbar component are welded at the inner circumferential wall of the mounting groove.

[0022] In this way, stable and reliable electrical connection and mechanical connection between the electrode terminal and the busbar component are achieved.

[0023] In some embodiments, one of the mounting groove and the busbar component is provided with a positioning portion, and the other is provided with a positioning groove, and the positioning portion is inserted into the positioning groove.

[0024] In this way, the busbar component is positioned in the mounting groove, so as to facilitate electrical connection between the busbar component and the electrode terminal.

[0025] In some embodiments, the positioning portion or the positioning groove is arranged on the inner circumferential wall of the mounting groove.

[0026] In this way, the electrode terminal and the busbar component can also be seam-welded between the outer wall of the positioning portion and the inner circumferential wall of the positioning groove, which helps to increase the contact area between the busbar component and the electrode terminal, thereby improving the reliability of electrical connection and mechanical connection between the electrode terminal and the busbar component.

[0027] In some embodiments, one of the mounting groove and the busbar component is provided with a positioning portion, and the other is provided with a positioning groove, and the positioning portion is inserted into the positioning groove; the inner circumferential wall of the mounting groove along a third direction is provided with the positioning portion or the positioning groove, the first direction and the third direction intersect, and the second direction and the third direction intersect.

[0028] In this way, the busbar component and the electrode terminal are limited in the second direction through the insertion and cooperation between the positioning portion and the positioning groove, which helps to improve the mechanical connection between the electrode terminal and the busbar component.

[0029] In some embodiments, the electrode terminal includes a positive electrode terminal and a negative electrode terminal, and in the battery monomer, the positive electrode terminal and the negative electrode terminal are arranged on the same first wall in the second direction, the slot is arranged at one end of the mounting groove away from the negative electrode terminal in the second direction in the positive electrode terminal, and the slot is arranged at one end of the mounting groove away from the positive electrode terminal in the second direction in the negative electrode terminal.

[0030] In this way, the busbar component on the positive electrode terminal and the busbar component on the negative electrode terminal extend to the outside of the shell in the second direction, respectively, which facilitates electrical connection between the electrode terminals of two adjacent battery monomers through the busbar components.

[0031] In some embodiments, the battery cell assembly comprises a plurality of rows of battery cells arranged along a third direction, each row of battery cells comprising a plurality of battery cells arranged along a second direction; the plurality of busbar components comprises a first busbar component and a second busbar component;

[0032] In each row of battery cells, the electrode terminals of two adjacent battery cells are electrically connected by the first busbar component;

[0033] The electrode terminals of two adjacent rows of battery cells are electrically connected by the second busbar component, and the second busbar component is partially distributed along the second direction with the battery cells;

[0034] The third direction intersects the first direction and the second direction.

[0035] In this way, the second busbar component is partially distributed along the second direction with the battery cells, so that the second busbar component and the battery cells can share space along the first direction, which helps to improve the energy density of the battery device.

[0036] In some embodiments, the battery device further comprises a box body, the box body comprising a first box body and a second box body, in the first direction, the second box body is arranged at one end of the first box body close to the first wall, and the battery cell assembly is arranged in a space formed by the first box body and the second box body;

[0037] The battery device further comprises a first adhesive layer, the first adhesive layer being bonded between the second box body and the first wall of the shell close to the second box body to fix the second box body and the battery cell assembly.

[0038] In this way, the battery cell assembly is fixed to the second box body, so that the second box body can constrain the battery cell assembly to resist the expansion of the battery cell assembly. In this way, the setting of components such as steel belts and pressing strips can be omitted, which helps to improve the energy density of the battery device.

[0039] In some embodiments, the battery device further comprises an information acquisition assembly arranged on the first wall and electrically connected to the electrode terminals, and the first adhesive layer avoids the information acquisition assembly.

[0040] In this way, the fixing reliability between the second box body and the battery cell assembly can be improved.

[0041] In some embodiments, in the first direction, a second adhesive layer is bonded between the wall of the shell away from the second box body and the first box body.

[0042] In this way, the battery monomer assembly is adhered to the first box through the second adhesive layer and adhered to the second box through the first adhesive layer, and the second box is fixed to the first box, so that the first box, the battery monomer assembly and the second box are fixed as a whole, so that the first box and the second box jointly realize the constraint of the battery monomer assembly to resist the expansion of the battery monomer assembly.

[0043] In some embodiments, the first box includes two first side walls opposite in the second direction and two second side walls opposite in the third direction, the battery monomer assembly is limited between the two first side walls in the second direction and between the two second side walls in the third direction.

[0044] The first direction, the second direction and the third direction are mutually intersected.

[0045] Through the arrangement of the two first side walls and the two second side walls, the battery monomer assembly is limited in the first box in the second direction and the third direction, which helps to further fix the first box, the battery monomer assembly and the second box as a whole, so that the first box and the second box jointly realize the constraint of the battery monomer assembly to resist the expansion of the battery monomer assembly.

[0046] In a second aspect, the embodiments of the present application provide a battery monomer, comprising:

[0047] A shell;

[0048] An electrode assembly arranged in the shell;

[0049] An electrode terminal arranged in an insulating manner on a first wall of the shell in the first direction and used for electrical connection with the busbar component, the electrode terminal being provided with a mounting slot at one end thereof away from the electrode assembly in the first direction, and the mounting slot being used for plug-in connection with the busbar component.

[0050] The battery monomer provided by the embodiments of the present application is provided with the mounting slot at one end of the electrode terminal away from the electrode assembly in the first direction, so that part of the busbar component can be inserted into the mounting slot, and at least part of the electrode terminal and the busbar component can share space in the first direction, so that in the case that the size of the battery monomer in the first direction is predetermined, the space occupied by the whole of the battery monomer and the busbar component in the first direction is reduced, thereby improving the utilization rate of the internal space of the battery device in the first direction and improving the energy density of the battery device.

[0051] In some embodiments, the first wall is provided with an electrode lead-out hole through the first direction, and at least part of the electrode terminal is inserted into the electrode lead-out hole;

[0052] One end of the mounting slot in the second direction is provided with a slot opening;

[0053] The shell is provided with a second wall along the second direction, the second wall is provided with a first slot along the second direction, and the first slot is distributed and communicated with the slot along the second direction;

[0054] The first direction and the second direction are intersected.

[0055] In this way, the current collecting component extends to the part outside the mounting slot along the second direction, is inserted into the slot and the first slot, and the current collecting component also shares the space with the second wall along the first direction, which helps to reduce the size of the whole battery monomer and the current collecting component along the first direction, further improves the utilization of the internal space of the battery device along the first direction, and improves the energy density of the battery device.

[0056] In some embodiments, the battery monomer further comprises an insulation structure, at least part of the insulation structure is arranged in the electrode lead-out hole and surrounds the outer periphery of the electrode terminal; the insulation structure comprises a first insulation part arranged between the second wall and the electrode terminal, and the first insulation part is provided with a second slot communicated between the slot and the first slot.

[0057] In this way, the arrangement of the current collecting component can avoid the insulation structure, so as to facilitate the current collecting component and the battery monomer to share the space along the first direction, and facilitate to improve the energy density of the battery device.

[0058] In a third aspect, the embodiments of the present application provide a power consumption device comprising the battery device or the battery monomer.

[0059] The power consumption device provided by the embodiments of the present application helps to improve the energy density of the battery monomer or the battery device, and improves the reliability of the power consumption device by adopting the above-mentioned battery device or battery monomer.

[0060] In a fourth aspect, the embodiments of the present application provide an energy storage device comprising the battery device or the battery monomer, and the battery device or the battery monomer is used for storing or providing electric energy.

[0061] The energy storage device provided by the embodiments of the present application helps to improve the energy density of the energy storage device by adopting the above-mentioned battery device or battery monomer.

[0062] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0064] Figure 1 A schematic diagram of a vehicle provided in some embodiments of the present application;

[0065] Figure 2 A perspective structural diagram of a battery device provided in some embodiments of the present application;

[0066] Figure 3 A perspective structural diagram of a battery device provided in some embodiments of the present application; Figure 2 A partial perspective structural diagram of a battery device provided in some embodiments of the present application;

[0067] Figure 4 An enlarged view of A in FIG. 1 provided in some embodiments of the present application; Figure 3

[0068] An enlarged view of B in FIG. 1 provided in some embodiments of the present application; Figure 5

[0069] An enlarged view of D in FIG. 1 provided in some embodiments of the present application; Figure 6 Figure 5 A sectional view along C-C provided in some embodiments of the present application;

[0070] Figure 7 Figure 5 A sectional view along D-D provided in some embodiments of the present application.

[0071] Figure 8 A sectional view along D-D provided in some embodiments of the present application. Figure 7 In the drawings, various reference numerals are used to indicate various elements, and the same or similar elements are denoted by the same or similar reference numerals.

[0072] 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-battery cell assembly; 1-battery cell; 101-mounting groove; 102-groove; 103-electrode lead-out hole; 104-first groove; 105-second groove; 11-outer shell; 111-shell; 1111-second wall; 112-end cover; 1121-first wall; 12-electrode assembly; 13-electrode terminal; 131-positioning portion; 14-insulating structure; 141-first insulating portion; 142-second insulating portion; 20-busbar member; 20a-first busbar member; 20b-second busbar member; 30-box; 31-first box; 311-first side wall; 312-second side wall; 32-second box; Z-first direction; X-second direction; Y-third direction.

[0073] DETAILED DESCRIPTION

[0074] ​​​Embodiments of the present application are described below in detail with reference to examples shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0075] If there is no specific description, all the embodiments and optional embodiments of the embodiments of the present application can be combined with each other to form new technical solutions without conflict.

[0076] If there is no specific description, all the technical features and optional technical features of the embodiments of the present application can be combined with each other to form new technical solutions without conflict.

[0077] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0078] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0079] In the description of the embodiments of the present application, the meaning of "multiple" is more than two, and "more than two" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "multiple groups" is more than two groups, including two groups.

[0080] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "adjacent", "adjacent to" refer to close in position. For example, A1, A2 and B three components, the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, and it can also be said that B is adjacent to A2, in other words, A2 is adjacent to B. For another example, when there are multiple C components, the multiple C components are C1, C2……CN respectively, and when one of the C components, such as C2, is closer to the B component than the other C components, then B is adjacent to C2, and it can also be said that C2 is adjacent to B, in other words, C2 is adjacent to B.

[0082] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0083] From the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage system such as hydroelectric power station, thermal power station, wind power station and solar power station, but also widely applied to electric vehicles such as electric bicycle, electric motorcycle, electric automobile and electric traffic tool, and many fields such as military equipment and aerospace. With the continuous expansion of the application field of battery device, the demand of its market is also increasing. And the capacity of battery device is getting larger and larger, and the performance requirement of battery device is getting higher and higher.

[0084] Among them, the battery device can be a power battery or an energy storage battery.

[0085] In some cases, the space utilization of the internal space of the battery device is low, which affects the energy density of the battery device.

[0086] For example, the battery device usually includes a plurality of battery monomers and a plurality of busbar components, the battery monomer includes a shell, an electrode assembly and an electrode terminal, the electrode assembly is arranged in the shell, and the electrode terminal is arranged on an end wall of the shell along the height direction of the battery monomer, and the electrode terminal is electrically connected to the electrode assembly. In the height direction of the battery monomer, the busbar component is arranged at one end of the electrode terminal away from the electrode assembly, and the busbar component is welded to the electrode terminal, so that the plurality of battery monomers are electrically connected through the busbar component. In this way, the battery monomer and the busbar component need to occupy the internal space of the battery device in the height direction of the battery monomer, which reduces the utilization of the internal space of the battery device in the height direction of the battery monomer, thereby reducing the energy density of the battery device.

[0087] Based on the above considerations, the embodiments of the present application provide a battery device, a battery cell, a power consumption device and an energy storage device. The electrode terminal is provided with a mounting groove at one end of the electrode assembly in the first direction. The part of the busbar component is inserted into the mounting groove, so that the electrode terminal and the busbar component can share space in the first direction. In this way, the overall space occupied by the battery cell and the busbar component in the first direction is reduced under the condition that the size of the battery cell in the first direction is predetermined, thereby improving the utilization of the internal space of the battery device in the first direction and improving the energy density of the battery device.

[0088] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, connected in parallel or connected in a mixed manner by a busbar component. Among them, the mixed connection means that there are both series connection and parallel connection among the plurality of battery cells.

[0089] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0090] In some embodiments, the battery cell assembly or the battery device can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie. As an example, the two ends and the two sides of the battery cell assembly can be respectively provided with end plate structures and side plate structures.

[0091] In some embodiments, the battery device can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0092] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0093] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0094] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. Among them, the second box body can be a top cover or a floor.

[0095] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0096] The battery cell referred to in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell can be a secondary battery or a primary battery. The secondary battery refers to a battery cell that can continue to be used by activating the active material through charging after the battery cell is discharged.

[0097] The battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square cell, a blade cell, and a multi-prismatic battery cell, such as a hexagonal prismatic battery cell. The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, or the like.

[0098] The battery cell or the battery device referred to in the embodiments of the present application can be used in an energy storage device that uses the battery cell or the battery device as an energy storage element.

[0099] The energy storage device referred to in the embodiments of the present application can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy at a low electricity consumption valley, and provide electric energy for related users or electric devices at a high electricity consumption peak. The energy storage system provided in the embodiments of the present application can be any power system that needs to use an energy storage device.

[0100] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0101] In some embodiments, the energy storage device can include one or more battery clusters, and each battery cluster includes a plurality of battery devices.

[0102] In some embodiments, the plurality of battery devices in the battery cluster can be connected in series through a current collection component to improve the voltage and capacity of the energy storage device.

[0103] In some embodiments, when the energy storage device includes a plurality of battery clusters, the plurality of battery clusters can be connected in parallel to improve the capacity of the energy storage device.

[0104] In some embodiments, the energy storage device can further include a cabinet body, and the battery cluster is accommodated in the cabinet body.

[0105] In some embodiments, the energy storage device can further include a thermal management module, a master control module, a general control module, a power distribution module, a fire-fighting module, and the like.

[0106] In some embodiments, the thermal management module can include a liquid cooling unit that provides cooling liquid to each battery device through a pipeline for regulating the temperature of the battery cells.

[0107] In some embodiments, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the master control module can control the charging and discharging current, voltage, etc. of the battery cluster. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0108] In some embodiments, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the master control module can control the charging and discharging current, voltage, etc. of the battery cluster. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0109] In some embodiments, the fire control module can include a control panel, a detector, an alarm device, etc. for detecting, alarming, or extinguishing the energy storage device.

[0110] In some embodiments, the power distribution module can be used to distribute power to modules in the energy storage device that need power.

[0111] The battery cell and the battery device provided by the embodiments of the present application can also be used in a power consumption device using the battery cell or the battery device as a power source.

[0112] The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, a vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc. According to the power source, the vehicle can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid electric car, or an extended range car, etc. According to the driving mode, the vehicle can be a front-wheel drive car, a rear-wheel drive car, or an all-wheel drive car.

[0113] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0114] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0115] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0116] In some embodiments, please refer to the following: Figure 2 and Figure 3 , Figure 2 This is a perspective structural view of the battery device 100 provided in some embodiments of this application. Figure 3 for Figure 2 A partial perspective view of the battery device 100 is provided. The battery device 100 may include a housing 30 and a battery cell 1. The housing 30 is a structure with internal space, and the internal space of the housing 30 is used to accommodate the battery cell 1.

[0117] The housing 30 can adopt various structures. In some embodiments, the housing 30 may include a first housing 31 and a second housing 32, which overlap each other and jointly define the internal space of the housing 30, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the housing 30 can be a sealed structure or an unsealed structure. Both the first housing 31 and the second housing 32 can be hollow structures with an opening at one end, with the opening side of the first housing 31 overlapping the opening side of the second housing 32, so that the first housing 31 and the second housing 32 jointly define the internal space of the housing 30. Alternatively, as... Figure 2 and Figure 3As shown, the first box body 31 can be a hollow structure with an opening at one end, and the second box body 32 is a plate-shaped structure, which is combined with the opening side of the first box body 31 to jointly define the internal space of the box body 30. The box body 30 composed of the first box body 31 and the second box body 32 can be in various shapes, such as a cylinder, a cuboid, etc.

[0118] In some embodiments, the plurality of battery monomers 1 can be connected in series, in parallel, or in a mixed manner to form a whole, and then the whole formed by the plurality of battery monomers 1 (battery monomer assembly 10) is directly accommodated in the internal space of the box body 30. In other embodiments, the plurality of battery monomers 1 can also be connected in series, in parallel, or in a mixed manner and arranged and fixed to form a battery module (battery monomer assembly 10), and the battery module is accommodated in the internal space of the box body 30.

[0119] In some embodiments, please combine Figures 1 to 3 , the box body 30 of the battery device 100 can be part of the chassis structure of the vehicle 1000. For example, part of the box body 30 can be at least part of the floor of the vehicle 1000, or part of the box body 30 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0120] Please refer to Figure 3 and Figure 4 , wherein, Figure 4 is an enlarged view of A in Figure 3 . The battery device 100 provided by the embodiments of the present application comprises a battery monomer assembly 10 and a current collecting component 20, the battery monomer assembly 10 comprises a plurality of battery monomers 1, and two adjacent battery monomers 1 are electrically connected through the current collecting component 20, so that the plurality of battery monomers 1 in the battery monomer assembly 10 are electrically connected through the plurality of current collecting components 20.

[0121] The current collecting component 20 refers to a component with conductive performance for current collection. The current collecting component 20 can be a copper bar, an aluminum bar, etc.

[0122] Specifically, the current collecting component 20 is electrically connected to the battery monomer 1, so that the plurality of battery monomers 1 in the battery monomer assembly 10 are electrically connected through the current collecting component 20. The plurality of battery monomers 1 in the battery monomer assembly 10 can be connected in series, in parallel, or in a mixed manner through the current collecting component 20.

[0123] Please refer to Figures 3 to 7 , wherein, Figure 5 is a perspective view of the battery monomer 1 provided by some embodiments of the present application, Figure 6 is an enlarged view of B in Figure 5 , Figure 7 is an enlarged view of C in Figure 5A cross-sectional view along C-C. The battery cell 1 provided by embodiments of the present application includes a housing 11, an electrode assembly 12, and an electrode terminal 13. The electrode assembly 12 is disposed in the housing 11. The electrode terminal 13 is insulated and disposed on a first wall 1121 of the housing 11 along a first direction Z. The electrode terminal 13 is provided with a mounting groove 101 on a side thereof away from the electrode assembly 12 along the first direction Z. A portion of the busbar 20 is inserted into the mounting groove 101, and the busbar 20 is electrically connected to the electrode terminal 13.

[0124] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 1. The electrode assembly 12 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. During charging and discharging of the battery cell 1, active ions (e.g., lithium ions) are inserted into and extracted from between the positive electrode sheet and the negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet, and can prevent short circuiting between the positive electrode sheet and the negative electrode sheet while allowing the active ions to pass through.

[0125] The electrode assembly 12 can have a jelly-roll structure, a stacked structure, or a hybrid structure of a jelly-roll and a stacked structure.

[0126] In some embodiments, the electrode assembly 12 has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into a jelly-roll structure.

[0127] In some embodiments, the electrode assembly 12 has a stacked structure.

[0128] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0129] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be clamped between adjacent folded segments.

[0130] For example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0131] For example, a plurality of separators can be provided, and each of the plurality of separators can be disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0132] For example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0133] In some embodiments, the electrode assembly 12 can have a cylindrical shape, a flat shape, or a polygonal shape.

[0134] In some embodiments, the electrode assembly 12 is provided with a tab. The tab can guide current out of the electrode assembly 12. The tab includes a positive electrode tab and a negative electrode tab.

[0135] As an example, the part of the positive electrode tab and the negative electrode tab having the active material constitutes the main body part of the electrode assembly 12, and the part of the positive electrode tab and the negative electrode tab not having the active material each constitutes the tab. The tab of the positive electrode tab is the positive electrode tab, and the tab of the negative electrode tab is the negative electrode tab. Among them, the positive electrode tab and the negative electrode tab can be located at one end of the main body part together; or the positive electrode tab and the negative electrode tab can also be located at opposite ends of the main body part respectively.

[0136] Among them, the number of the electrode assembly 12 in the battery monomer 1 can be one or more.

[0137] Among them, the battery monomer 1 can also include an electrolyte, which plays a role in conducting ions between the positive electrode tab and the negative electrode tab. Among them, the electrolyte involved in the embodiments of the present application can be liquid, gel or solid.

[0138] The shell 11 is used to define the internal environment of the battery monomer 1, and the internal environment defined by the shell 11 is used to accommodate the electrode assembly 12 and the electrolyte. Among them, the shell 11 can be a sealed structure, or a non-sealed structure. As an example, when the shell 11 is a sealed structure, the shell 11 can play a role in protecting the electrode assembly 12 and preventing electrolyte leakage to some extent. As an example, when the shell 11 is a non-sealed structure, the shell 11 can play a role in protecting the electrode assembly 12, and the shell 11 and the electrode assembly 12 can further include a sealing bag for packaging the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure 14, an aluminum plastic film, etc.

[0139] Among them, the shell 11 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 11), or an aluminum plastic film, etc.

[0140] The electrode terminal 13 refers to a component with conductive performance, and the electrode terminal 13 is the current transmission end of the battery monomer 1 for transmitting current. Among them, the electrode terminal 13 can be but is not limited to a pole.

[0141] The electrode terminal 13 is electrically connected to the electrode assembly 12, specifically, the electrode terminal 13 is electrically connected to the tab of the electrode assembly 12. Among them, the electrode terminal 13 can be directly electrically connected to the tab through welding, bonding, etc.; or the electrode terminal 13 and the tab can also be provided with a switching structure, which realizes the switching between the electrode terminal 13 and the tab to be able to flow, thereby indirectly realizing the electrical connection between the electrode terminal 13 and the tab. Among them, the switching structure refers to a metal structure with conductive performance, for example, but not limited to, a copper bar. The switching structure and the tab, the switching structure and the electrode terminal 13 can be electrically connected through welding, bonding, etc.

[0142] The number of electrode terminals 13 can be set to be multiple, and the multiple electrode terminals 13 can include a positive electrode terminal and a negative electrode terminal. For example, the number of electrode terminals 13 is two, and the two electrode terminals 13 are respectively a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal are both electrically connected to the electrode assembly 12, and specifically, the positive electrode terminal is electrically connected to the positive electrode tab, and the negative electrode terminal is electrically connected to the negative electrode tab.

[0143] The first wall 1121 is a solid wall of the shell 11 at the end side along the first direction Z. It can be understood that at least one end of the shell 11 along the first direction Z is provided with the first wall 1121. The electrode terminal 13 is insulated and arranged on the first wall 1121 of the shell 11 along the first direction Z, which means that the electrode terminal 13 is arranged on the first wall 1121, and an insulating structure 14 is arranged between the electrode terminal 13 and the first wall 1121, so that the first wall 1121 and the electrode terminal 13 are insulated by the insulating structure 14.

[0144] In some embodiments, one end of the shell 11 along the first direction Z is provided with the first wall 1121, as shown in FIG. 1. The positive electrode terminal and the negative electrode terminal are both insulated and arranged on the same first wall 1121. Figures 4 to 7

[0145] In some embodiments, both ends of the shell 11 along the first direction Z are provided with the first wall 1121. The positive electrode terminal and the negative electrode terminal are respectively insulated and arranged on the two first walls 1121.

[0146] The electrode terminal 13 is provided with a mounting groove 101 on the side away from the electrode assembly 12 along the first direction Z, which means that the electrode terminal 13 is recessed on the side away from the electrode assembly 12 along the first direction Z to form the mounting groove 101. That is, the mounting groove 101 is a recess formed on the side of the electrode terminal 13 away from the electrode assembly 12 along the first direction Z.

[0147] The part of the busbar component 20 is inserted into the mounting groove 101, which means that for a single mounting groove 101, one part of the busbar component 20 is located in the mounting groove 101, and the other part of the busbar component 20 extends out of the mounting groove, so that the other part of the busbar component 20 can extend to be electrically connected to the electrode terminal 13 of the adjacent battery monomer 1, specifically, the other part of the busbar component 20 extends to be inserted into the mounting groove 101 of the adjacent battery monomer 1. Wherein, one part of the busbar component 20 is inserted into the mounting groove 101, and the other part of the busbar component 20 can protrude out of the electrode terminal 13 along the first direction Z or the second direction Y as described below.

[0148] ​In the first direction Z, the busbar component 20 is beyond the electrode terminal 13 in a direction away from the electrode assembly 12; or in the first direction Z, the electrode terminal 13 is beyond the busbar component 20 in a direction away from the electrode assembly 12; or in the first direction Z, the side of the electrode terminal 13 away from the electrode assembly 12 and the side of the busbar component 20 away from the electrode assembly 12 are flushly arranged.

[0149] The busbar component 20 is electrically connected with the electrode terminal 13. Understandably, the busbar component 20 is electrically connected with the electrode terminals 13 of two adjacent battery monomers 1 to realize the electrical connection between the two adjacent battery monomers 1. Specifically, one part of the busbar component 20 is in the mounting groove 101 of the electrode terminal 13 of one of the battery monomers 1 and is electrically connected with the electrode terminal 13 of the one of the battery monomers 1; another part of the busbar component 20 is in the mounting groove 101 of the electrode terminal 13 of another of the battery monomers 1 and is electrically connected with the electrode terminal 13 of the another of the battery monomers 1. In this way, the two battery monomers 1 are electrically connected through the busbar component 20.

[0150] As an example, one end of the busbar component 20 is electrically connected with the positive electrode terminal of one of the battery monomers 1, and the other end of the busbar component 20 is electrically connected with the negative electrode terminal of another of the battery monomers 1, so that the two battery monomers 1 are connected in series.

[0151] As an example, one end of the busbar component 20 is electrically connected with the positive electrode terminal of one of the battery monomers 1, and the other end of the busbar component 20 is electrically connected with the positive electrode terminal of another of the battery monomers 1, so that the two battery monomers 1 are connected in parallel.

[0152] In the first direction Z, the busbar component 20 is beyond the electrode terminal 13 in a direction away from the electrode assembly 12; or in the first direction Z, the electrode terminal 13 is beyond the busbar component 20 in a direction away from the electrode assembly 12; or in the first direction Z, the side of the electrode terminal 13 away from the electrode assembly 12 and the side of the busbar component 20 away from the electrode assembly 12 are flushly arranged.

[0153] The battery device 100 provided by the embodiment of the present application is provided with the mounting groove 101 at the end of the electrode terminal 13 away from the electrode assembly 12 in the first direction Z, and the busbar component 20 is partially inserted into the mounting groove 101, so that at least part of the electrode terminal 13 and the busbar component 20 can share space in the first direction Z. In this way, in the case that the size of the battery monomer 1 in the first direction Z is predetermined, the space occupied by the whole of the battery monomer 1 and the busbar component 20 in the first direction Z is reduced, thereby improving the utilization rate of the internal space of the battery device 100 in the first direction Z, and improving the energy density of the battery device 100.

[0154] In some embodiments, referring to Figures 5 to 8 The shell 11 includes a shell body 111 and an end cover 112, and the electrode assembly 12 is arranged in the space formed by the shell body 111 and the end cover 112.

[0155] The shell 111 and the end cover 112 are components for jointly defining an internal environment of the battery cell 1, and the internal environment defined by the shell 111 and the end cover 112 is used for accommodating the electrode assembly 12 and the electrolyte.

[0156] In some implementations, the shell 111 and the end cover 112 can be independent components. Specifically, the shell 111 has an opening, and the end cover 112 is arranged at the opening of the shell 111 to jointly define the internal environment of the battery cell 1 with the shell 111 and to isolate the internal environment of the battery cell 1 from the external environment. In other implementations, the shell 111 and the end cover 112 can also be an integrated structure. Specifically, the end cover 112 and the shell 111 can form a common connecting surface before the electrode assembly 12 is accommodated in the shell, and the end cover 112 is arranged to cover the shell 111 when the electrode assembly 12 needs to be encapsulated.

[0157] Specifically, the end cover 112 is arranged at the end side of the shell 111 along the first direction Z.

[0158] In some implementations, as shown in FIG. 1, the number of the end cover 112 can be one, and the end cover 112 is arranged at one end of the shell 111. Alternatively, the number of the end cover 112 can be two, and the two end covers 112 are arranged at opposite ends of the shell 111. Figures 5 to 8

[0159] Specifically, the first wall 1121 can be arranged on the shell 111 or on the end cover 112. As an example, as shown in FIG. 1, the number of the end cover 112 is one, and the first wall 1121 is arranged on the end cover 112. Figures 5 to 8

[0160] The shell 111 can be cylindrical, square, or other shapes, which can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 111 and the end cover 112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0161] In some embodiments, please refer to FIG. 1 and FIG. 2. Figures 5 to 8 In some embodiments, please refer to FIG. 1 and FIG. 2. Figure 8 In some embodiments, please refer to FIG. 1 and FIG. 2. Figure 7 As shown in FIG. 2, the mounting groove 101 has a notch 102 at one end along the second direction X, and the current collector component 20 extends to the outside of the electrode terminal 13 through the notch 102. The first direction Z and the second direction X intersect.

[0162] The notch 102 is an opening arranged at one end of the mounting groove 101 along the second direction X, and the notch 102 and the mounting groove 101 are distributed along the second direction X and are in communication.

[0163] ​​The busbar member 20 extends out of the electrode terminal 13 through the slot 102, which means that part of the busbar member 20 penetrates the slot 102, and part of the busbar member 20 is located outside one end of the housing 11 along the second direction X.

[0164] The first direction Z and the second direction X intersect, which means that the first direction Z and the second direction X can form an included angle greater than 0° and less than 180°, that is, the first direction Z and the second direction X are not parallel. The first direction Z and the second direction X can be perpendicular to each other, or can not be perpendicular. The first direction Z and the second direction X can be directions intersecting on the same plane, or can be directions on planes respectively perpendicular to each other, and the projection of the second direction X on the plane where the first direction Z is located can intersect the first direction Z. As an example, the first direction Z and the second direction X are perpendicular. In some cases, the first direction Z can be the length direction or the height direction of the battery monomer 1, and the second direction X can be the width direction or the thickness direction of the battery monomer 1.

[0165] In this way, the busbar member 20 can extend out of the electrode terminal 13 through the slot 102, thereby being electrically connected to the electrode terminal 13 of the adjacent battery monomer 1, so that the part of the busbar member 20 extending out of the mounting groove 101 along the second direction X can share space with the electrode terminal 13 along the first direction Z, thereby helping to further improve the utilization of the internal space of the battery device 100 in the first direction Z, so as to improve the energy density of the battery device 100.

[0166] In some embodiments, please refer to Figures 5 to 8 In the first direction Z, the side of the electrode terminal 13 away from the electrode assembly 12 is flush with the side of the first wall 1121 away from the electrode assembly 12. Alternatively, in the first direction Z, the first wall 1121 protrudes out of the electrode terminal 13 in the direction away from the electrode assembly 12.

[0167] In this way, the electrode terminal 13 is completely retracted into the housing 11 along the first direction Z, which helps to reduce the size of the battery monomer 1 along the first direction Z under the condition that the size of the electrode assembly 12 along the first direction Z is predetermined, thereby helping to further reduce the size of the whole along the first direction Z which is composed of the battery monomer 1 and the busbar member 20.

[0168] In some embodiments, the electrode terminal 13 protrudes out of the first wall 1121 along the first direction Z, and the slot 102 is arranged on the part of the electrode terminal 13 protruding out of the first wall 1121 along the first direction Z.

[0169] In this way, the part of the busbar member 20 extending outside the mounting groove 101 in the second direction X is located on the side of the first wall 1121 away from the electrode assembly 12 in the first direction Z. In this way, the design of the housing 11 is simplified, thereby simplifying the structure of the battery cell 1.

[0170] In some embodiments, referring to Figures 5 to 8 , the first wall 1121 is provided with an electrode lead-out hole 103 penetrating in the first direction Z, and at least part of the electrode terminal 13 is inserted into the electrode lead-out hole 103.

[0171] The electrode lead-out hole 103 refers to a through hole of the first wall 1121 for mounting the electrode terminal 13. Specifically, at least part of the electrode terminal 13 is inserted into the electrode lead-out hole 103 in the first direction Z.

[0172] In this way, the at least part of the electrode terminal 13 is completely retracted into the housing 11 in the first direction Z, which can reduce the size of the electrode terminal 13 protruding outside the first wall 1121 in the first direction Z, thereby helping to reduce the size of the battery cell 1 in the first direction Z when the size of the electrode assembly 12 in the first direction Z is predetermined.

[0173] In some embodiments, referring to Figures 5 to 8 , the housing 11 is provided with a second wall 1111 in the second direction X, and the second wall 1111 is provided with a first groove 104 penetrating in the second direction X, the first groove 104 is distributed and communicated with the slot 102 in the second direction X, and part of the busbar member 20 is located in the first groove 104.

[0174] The second wall 1111 is a solid wall on the end side of the housing 11 in the second direction X. It can be understood that the housing 11 is provided with the second wall 1111 at least on one end in the second direction X. Specifically, the second wall 1111 is provided on the housing 111.

[0175] The first groove 104 is a through groove penetrating the second wall 1111 in the second direction X. In the second direction X, the slot 102 is located between the first groove 104 and the mounting groove 101, and the slot 102 is communicated with the first groove 104 and the mounting groove 101.

[0176] It can be understood that the busbar member 20 is inserted into the mounting groove 101, the slot 102 and the first groove 104. The part of the busbar member 20 extending outside the mounting groove 101 in the second direction X is sequentially arranged in the slot 102 and the first groove 104 in the second direction X to extend outside the second wall 1111.

[0177] As an example, the housing 11 is provided with the second walls 1111 at both ends in the second direction X. In the second direction X, the mounting groove 101 of the positive electrode terminal is provided with the notch 102 toward one end of one of the second walls 1111, i.e., in the second direction X, the notch 102 of the positive electrode terminal is communicated between the mounting groove 101 of the positive electrode terminal and one of the second walls 1111. In the second direction X, the mounting groove 101 of the negative electrode terminal is provided with the notch 102 toward one end of the other second wall 1111, i.e., in the second direction X, the notch 102 of the negative electrode terminal is communicated between the mounting groove 101 of the negative electrode terminal and the other second wall 1111.

[0178] In this way, the part of the busbar 20 extending out of the mounting groove 101 in the second direction X is inserted into the notch 102 and the first groove 104, so that the busbar 20 also shares the space in the first direction Z with the second wall 1111, which helps to reduce the size of the whole in the first direction Z of the battery monomer 1 and the busbar 20, and further improves the utilization of the internal space of the battery device 100 in the first direction Z, so as to improve the energy density of the battery device 100.

[0179] In some embodiments, referring to Figures 5 to 8 , the first groove 104 and the electrode lead-out hole 103 are distributed and communicated in the second direction X.

[0180] It can be understood that the hole wall of the electrode lead-out hole 103 in the second direction X is provided on the second wall 1111, i.e., the electrode lead-out hole 103 extends to the second wall 1111 in the second direction X.

[0181] Based on this, the first groove 104 is a recess provided on the second wall 1111 in the first direction Z.

[0182] In this way, the busbar 20 can be inserted into the mounting groove 101, the notch 102 and the first groove 104 in the first direction Z, which facilitates the installation of the busbar 20 on the battery monomer 1.

[0183] In some embodiments, the electrode lead-out hole 103 and the first groove 104 can be spaced apart in the second direction X.

[0184] Based on this, the busbar 20 is inserted into the first groove 104, the notch 102 and the mounting groove 101 in the second direction X, and the part of the busbar 20 between the notch 102 and the first groove 104 is located on the side of the first wall 1121 close to the electrode assembly 12 in the first direction Z.

[0185] In some embodiments, referring to Figures 5 to 8The battery cell 1 further includes an insulating structure 14, at least a portion of the insulating structure 14 is arranged in the electrode lead-out hole 103, and the insulating structure 14 surrounds the outer periphery of the electrode terminal 13.

[0186] The insulating structure 14 refers to a structure having an insulating property. The insulating structure 14 may, but is not limited to, be a plastic part.

[0187] Specifically, in a projection plane perpendicular to the first direction Z, the orthographic projection of the insulating structure 14 surrounds the outer periphery of the orthographic projection of the electrode terminal 13. In this way, the electrode terminal 13 and the housing 11 are insulated by the insulating structure 14.

[0188] In some embodiments, referring to Figures 5 to 8 The insulating structure 14 includes a first insulating portion 141, and in the second direction X, the first insulating portion 141 is arranged between the second wall 1111 and the electrode terminal 13. The first insulating portion 141 is provided with a second slot 105, the second slot 105 is communicated between the slot opening 102 and the first slot 104, and part of the busbar component 20 is located in the second slot 105.

[0189] The first insulating portion 141 is one part of the insulating structure 14 and has an insulating property. Specifically, the first insulating portion 141 is arranged between the second wall 1111 and the electrode terminal 13 to achieve insulation between the electrode terminal 13 and the second wall 1111.

[0190] It can be understood that the insulating structure 14 further includes a second insulating portion 142, which is also one part of the insulating structure 14 and has an insulating property. The first insulating portion 141 and the second insulating portion 142 are both arranged in the electrode lead-out hole 103 and jointly surround the outer periphery of the electrode terminal 13.

[0191] The second slot 105 penetrates the first insulating portion 141 along the second direction X. It can be understood that the mounting slot 101, the slot opening 102, the second slot 105, and the first slot 104 are sequentially distributed and communicated along the second direction X, and the busbar component 20 is inserted into the mounting slot 101, the slot opening 102, the second slot 105, and the first slot 104. That is, the part of the busbar component 20 extending out of the mounting slot 101 is inserted into the slot opening 102, the second slot 105, and the first slot 104 along the second direction X.

[0192] In this way, the arrangement of the busbar component 20 can avoid the insulating structure 14, thereby facilitating the busbar component 20 and the battery cell 1 to share space along the first direction Z and improving the energy density of the battery device 100.

[0193] It can be understood that, in the first direction Z, the first insulation part 141 is located between the busbar component 20 and the electrode assembly 12, so that the first insulation part 141 realizes the insulation between the electrode assembly 12 and the busbar component 20.

[0194] In the case where the electrode lead-out hole 103 and the first groove 104 are distributed and directly communicated along the second direction X, the second groove 105 is a groove recessed in the first direction Z for the first insulation part 141.

[0195] In some embodiments, referring to Figures 5 to 8 , the electrode terminal 13 and the busbar component 20 are welded at the inner peripheral wall of the mounting groove 101.

[0196] It can be understood that, the electrode terminal 13 and the busbar component 20 are stitch-welded at the position near the inner peripheral wall of the mounting groove 101 and the busbar component 20.

[0197] In this way, it is helpful to realize stable and reliable electrical connection and mechanical connection between the electrode terminal 13 and the busbar component 20.

[0198] In some embodiments, referring to Figures 5 to 8 , one of the mounting groove 101 and the busbar component 20 is provided with a positioning part 131, and the other is provided with a positioning groove, and the positioning part 131 is inserted into the positioning groove.

[0199] In some embodiments, as shown in Figures 5 to 8 , the mounting groove 101 is provided with a positioning part 131, and the busbar component 20 is provided with a positioning groove, and the positioning part 131 and the positioning groove are inserted and matched.

[0200] In the case where the positioning part 131 can be provided on the groove bottom of the mounting groove 101, or can be provided on the inner peripheral wall of the mounting groove 101.

[0201] In the case where the positioning groove can be, but is not limited to, a through groove penetrating the busbar component 20 along the first direction Z.

[0202] In some embodiments, the mounting groove 101 is provided with a positioning groove, and the busbar component 20 is provided with a positioning part 131, and the positioning part 131 and the positioning groove are inserted and matched.

[0203] In the case where the positioning groove can be provided on the groove bottom of the mounting groove 101, or can be provided on the inner peripheral wall of the mounting groove 101.

[0204] In this way, it is convenient to realize the positioning of the busbar component 20 in the mounting groove 101, so as to realize the electrical connection between the busbar component 20 and the electrode terminal 13.

[0205] In some embodiments, referring to Figure 5The positioning part 131 or the positioning groove is arranged on the inner circumferential wall of the mounting groove 101.

[0206] It can be understood that when the positioning part 131 is arranged in the mounting groove 101, the positioning part 131 is arranged on the inner circumferential wall of the mounting groove 101, as shown in Figures 5 to 8 When the positioning groove is arranged in the mounting groove 101, the positioning groove is arranged on the inner circumferential wall of the mounting groove 101.

[0207] In this way, the electrode terminal 13 and the busbar component 20 can also be seam-welded between the outer wall of the positioning part 131 and the inner circumferential wall of the positioning groove, which helps to increase the contact area between the busbar component 20 and the electrode terminal 13, so as to improve the reliability of the electrical connection and mechanical connection between the electrode terminal 13 and the busbar component 20.

[0208] In some embodiments, referring to Figure 5 , one of the mounting groove 101 and the busbar component 20 is provided with the positioning part 131, and the other is provided with the positioning groove, and the positioning part 131 is inserted into the positioning groove. The mounting groove 101 is provided with the slot 102 at one end along the second direction X, and the busbar component 20 extends to the outside of the electrode terminal 13 through the slot 102. The mounting groove 101 is provided with the positioning part 131 or the positioning groove on the inner circumferential wall along the third direction Y.

[0209] It can be understood that the positioning part 131 or the positioning groove is arranged on the inner circumferential wall of the mounting groove 101. Specifically, when the positioning part 131 is arranged in the mounting groove 101, the positioning part 131 is arranged on the inner circumferential wall of the mounting groove 101 along the third direction Y, as shown in Figure 6 and Figures 5 to 8 When the positioning groove is arranged in the mounting groove 101, the positioning groove is arranged on the inner circumferential wall of the mounting groove 101 along the third direction Y.

[0210] Based on this, the second wall 1111 is recessed to form the first groove 104 on the side away from the electrode assembly 12 along the first direction Z, and the first insulating part 141 is recessed to form the second groove 105 on the side away from the electrode assembly 12 along the first direction Z. In this way, the busbar component 20 is inserted into the mounting groove 101, the slot 102, the second groove 105 and the first groove 104 along the first direction Z.

[0211] In this way, through the insertion and cooperation between the positioning part 131 and the positioning groove, the busbar component 20 and the electrode terminal 13 are limited in the second direction X, which helps to improve the mechanical connection between the electrode terminal 13 and the busbar component 20.

[0212] In some embodiments, the mounting groove 101 can also be provided with the positioning part 131 or the positioning groove on the inner circumferential wall along the second direction X.

[0213] The first direction Z and the second direction X intersect, the first direction Z and the third direction Y intersect, and the second direction X and the third direction Y intersect, and the first direction Z, the second direction X and the third direction Y do not exist in the same plane. The first direction Z and the third direction Y intersect, and the second direction X and the third direction Y intersect can also be interpreted as the first direction Z and the second direction X intersect, which will not be repeated here. As an example, the first direction Z and the second direction X are perpendicular, the first direction Z and the third direction Y are perpendicular, and the second direction X and the third direction Y are perpendicular. As an example, the first direction Z is the height direction or the length direction of the battery monomer 1, the second direction X is the width direction of the battery monomer 1, and the third direction Y is the thickness direction of the battery monomer 1.

[0214] In some embodiments, referring to Figures 3 to 8 , the number of electrode terminals 13 is multiple, and the multiple electrode terminals 13 include positive electrode terminals and negative electrode terminals. In the battery monomer 1, the positive electrode terminals and the negative electrode terminals are arranged on the same first wall 1121 along the second direction X. In the positive electrode terminal, the notch 102 is arranged at one end of the mounting groove 101 away from the negative electrode terminal along the second direction X. In the negative electrode terminal, the notch 102 is arranged at one end of the mounting groove 101 away from the positive electrode terminal along the second direction X.

[0215] It can be understood that the shell 11 is provided with a second wall 1111 at both ends along the second direction X. In the second direction X, the busbar component 20 electrically connected to the positive electrode terminal extends to one of the second walls 1111 outside through the notch 102 of the positive electrode terminal. In the second direction X, the busbar component 20 electrically connected to the negative electrode terminal extends to the other second wall 1111 outside through the notch 102 of the negative electrode terminal.

[0216] In this way, in the second direction X, the busbar component 20 on the positive electrode terminal and the busbar component 20 on the negative electrode terminal extend to the outside of the shell 11, respectively, so that the electrode terminals 13 of two adjacent battery monomers 1 are electrically connected through the busbar component 20.

[0217] In some embodiments, referring to Figures 2 to 4The battery cell assembly 10 comprises a plurality of rows of battery cells 1 arranged along a third direction Y, each row of battery cells 1 comprising a plurality of battery cells 1 arranged along a second direction X. The plurality of busbar components 20 comprises a first busbar component 20a and a second busbar component 20b. In each row of battery cells 1, the electrode terminals 13 of two battery cells 1 adjacent along the second direction X are electrically connected by the first busbar component 20a. The electrode terminals 13 of two rows of battery cells 1 adjacent along the third direction Y are electrically connected by the second busbar component 20b, and the second busbar component 20b is distributed along the second direction X with the battery cells 1. The third direction Y is transverse to the first direction Z and the second direction X.

[0218] It can be appreciated that the first busbar component 20a is arranged to extend along the second direction X such that two portions of the first busbar component 20a are arranged in the electrode terminals 13 of two battery cells 1 adjacent along the second direction X, respectively. As an example, the first busbar component 20a is electrically connected to the electrode terminals 13 of two battery cells 1 adjacent along the second direction X, respectively, to connect the two battery cells 1 in series.

[0219] It can be appreciated that the second busbar component 20b comprises a first end portion, a second end portion and an intermediate portion connected between the first end portion and the second end portion, the first end portion and the second end portion are electrically connected to the electrode terminals 13 of two battery cells 1 adjacent along the third direction Y, respectively, and the intermediate portion is distributed along the second direction X with the battery cells 1. As an example, the second busbar component 20b is electrically connected to the electrode terminals 13 of two battery cells 1 adjacent along the third direction Y, respectively, to connect the two rows of battery cells 1 in series or in parallel.

[0220] In this way, the second busbar component 20b is distributed along the second direction X with the battery cells 1, so that the second busbar component 20b and the battery cells 1 can share the space along the first direction Z, which helps to improve the energy density of the battery device 100.

[0221] In some embodiments, referring to Figure 3 The battery device 100 further comprises a box 30, the box 30 comprises a first box 31 and a second box 32. In the first direction Z, the second box 32 is arranged at one end of the first box 31 close to the first wall 1121. The battery cell assembly 10 is arranged in the space enclosed by the first box 31 and the second box 32. The battery device 100 further comprises a first adhesive layer, the first adhesive layer is bonded between the second box 32 and the first wall 1121 of the outer shell 11 close to the second box 32, to fix the second box 32 and the battery cell assembly 10.

[0222] It can be understood that the shell 11 is provided with the first wall 1121 only at one end in the first direction Z, that is, the shell 11 only includes one first wall 1121.

[0223] The first adhesive layer refers to a structural layer formed by glue and has adhesion.

[0224] The first adhesive layer is arranged on the first wall 1121, and the opposite sides of the first adhesive layer in the first direction Z are respectively bonded to the first wall 1121 and the second box body 32, so as to fix the battery monomer assembly 10 and the second box body 32.

[0225] In this way, the battery monomer assembly 10 is fixed on the second box body 32, so that the second box body 32 can constrain the battery monomer assembly 10, thereby resisting the expansion of the battery monomer assembly 10. In this way, the setting of components such as steel belts and pressing strips can be omitted, thereby helping to improve the energy density of the battery device 100.

[0226] In some embodiments, the battery device 100 further includes an information acquisition assembly arranged on the first wall 1121 and electrically connected to the electrode terminal 13, and the first adhesive layer avoids the information acquisition assembly.

[0227] The information acquisition assembly refers to a structure electrically connected to the battery monomer assembly 10, and is used to acquire voltage, current, temperature and other data of the battery monomer assembly 10. The information acquisition assembly can include an information acquisition circuit board, or can include an information acquisition wire harness. The information acquisition circuit board can be, but is not limited to, a flexible circuit board (FPC, Flexible Printed Circuit).

[0228] The information acquisition assembly and the electrode terminal 13 can be electrically connected by welding, gluing or the like.

[0229] The first adhesive layer avoids the information acquisition assembly, that is, the first adhesive layer can be divided into multiple, and the multiple first adhesive layers are arranged on the second wall 1111 to avoid the information acquisition assembly.

[0230] In this way, the fixing reliability between the second box body 32 and the battery monomer assembly 10 can be improved.

[0231] In some embodiments, in the first direction Z, a second adhesive layer is bonded between the wall of the shell 11 away from the second box body 32 and the first box body 31.

[0232] It can be understood that the shell 11 is provided with the first wall 1121 only at one end in the first direction Z, that is, the shell 11 only includes one first wall 1121.

[0233] The second glue layer refers to a structure layer formed by glue, and has a bonding capacity.

[0234] The second glue layer is arranged on the wall of the shell 11 away from the first wall 1121 along the first direction Z, and the opposite sides of the second glue layer along the first direction Z are bonded to the first box body 31 and the shell 11 respectively, so as to bond the battery monomer assembly 10 to the first box body 31.

[0235] In this way, the battery monomer assembly 10 is bonded to the first box body 31 through the second glue layer, and is bonded to the second box body 32 through the first glue layer, and the second box body 32 is fixed to the first box body 31, so that the first box body 31, the battery monomer assembly 10 and the second box body 32 are fixed as a whole, so that the first box body 31 and the second box body 32 jointly realize the constraint on the battery monomer assembly 10 to resist the expansion of the battery monomer assembly 10.

[0236] In some embodiments, in the first direction Z, the wall of the first box body 31 away from the second box body 32 is provided with a heat management structure for heat management of the battery monomer 1 through a heat management medium such as cooling liquid.

[0237] The glue of the second glue layer can be a heat-conducting glue, so that the heat conduction efficiency between the battery monomer assembly 10 and the heat management structure can be improved, so as to improve the heat management effect of the battery monomer assembly 10.

[0238] In some embodiments, referring to Figures 3 to 8 , the first box body 31 includes two first side walls 311 and two second side walls 312, the two first side walls 311 are oppositely arranged along the second direction X, and the two second side walls 312 are oppositely arranged along the third direction Y. The battery monomer assembly 10 is limited between the two first side walls 311 along the second direction X, and the battery monomer assembly 10 is limited between the two second side walls 312 along the third direction Y.

[0239] The first side wall 311 can be a box wall of the first box body 31, or a beam, a side plate, an end plate, etc. in the first box body 31. The second side wall 312 can be a box wall of the first box body 31, or a beam, a side plate, an end plate, etc. in the first box body 31.

[0240] Through the arrangement of the two first side walls 311 and the two second side walls 312, the battery monomer assembly 10 is limited in the first box body 31 along the second direction X and the third direction Y, which helps to further fix the first box body 31, the battery monomer assembly 10 and the second box body 32 as a whole, so that the first box body 31 and the second box body 32 jointly realize the constraint on the battery monomer assembly 10 to resist the expansion of the battery monomer assembly 10.

[0241] Please refer to Figures 3 to 8The battery monomer 1 provided by the embodiment of the application comprises a shell 11, an electrode assembly 12 and an electrode terminal 13. The electrode assembly 12 is arranged in the shell 11. The electrode terminal 13 is arranged on a first wall 1121 of the shell 11 along a first direction Z in an insulating manner, and the electrode terminal 13 is used to be electrically connected with a busbar component 20. An installation groove 101 is arranged on a side of the electrode terminal 13 away from the electrode assembly 12 along the first direction Z, and the installation groove 101 is used to be plugged with the busbar component 20. The battery monomer 1 in the embodiment is the same as the battery monomer 1 in each of the above embodiments, and the specific description can be referred to the related description of the battery monomer 1 in each of the above embodiments, which is not described herein.

[0242] The battery monomer 1 provided by the embodiment of the application is provided with the installation groove 101 on one end of the electrode terminal 13 away from the electrode assembly 12 along the first direction Z, so that part of the busbar component 20 can be plugged into the installation groove 101, and at least part of the electrode terminal 13 and the busbar component 20 can share space in the first direction Z. In this way, in the case that the size of the battery monomer 1 in the first direction Z is predetermined, the space occupied by the whole of the battery monomer 1 and the busbar component 20 in the first direction Z is reduced, thereby improving the utilization rate of the internal space of the battery device 100 in the first direction Z, and improving the energy density of the battery device 100.

[0243] In some embodiments, referring to Figures 3 to 8 , the first wall 1121 is provided with an electrode lead-out hole 103 along the first direction Z, and at least part of the electrode terminal 13 is plugged into the electrode lead-out hole 103. One end of the installation groove 101 along the second direction X is provided with a slot 102. The shell 11 is provided with a second wall 1111 along the second direction X, and the second wall 1111 is provided with a first groove 104 along the second direction X. The slot 102 and the first groove 104 are distributed and communicated along the second direction X. The first direction Z and the second direction X intersect.

[0244] In this way, part of the busbar component 20 extending to the outside of the installation groove 101 along the second direction X is plugged into the slot 102 and the first groove 104, so that the busbar component 20 also shares space with the second wall 1111 in the first direction Z. This helps to reduce the size of the whole of the battery monomer 1 and the busbar component 20 in the first direction Z, and further improves the utilization rate of the internal space of the battery device 100 in the first direction Z, thereby improving the energy density of the battery device 100.

[0245] In some embodiments, referring to Figures 3 to 8The battery monomer 1 further comprises an insulation structure 14, at least part of the insulation structure 14 is arranged in the electrode lead-out hole 103, and the insulation structure 14 surrounds the outer periphery of the electrode terminal 13. The insulation structure 14 comprises a first insulation part 141, the first insulation part 141 is arranged between the second wall 1111 and the electrode terminal 13, and the first insulation part 141 is provided with a second groove 105, the second groove 105 is communicated between the slot 102 and the first groove 104.

[0246] In this way, the arrangement of the busbar component 20 can avoid the insulation structure 14, so as to facilitate the busbar component 20 and the battery monomer 1 to share space along the first direction Z, and improve the energy density of the battery device 100.

[0247] The power consumption device provided by the embodiment of the present application comprises the battery monomer 1 or the battery device 100. The battery monomer 1 and the battery device 100 in the embodiment are the same as those in the above embodiments, and the related description of the battery monomer 1 and the battery device 100 in the above embodiments is referred to.

[0248] The power consumption device provided by the embodiment of the present application adopts the battery monomer 1 or the battery device 100, which is helpful to improve the energy density of the battery monomer 1 or the battery device 100, and improve the reliability of the power consumption device.

[0249] The energy storage device provided by the embodiment of the present application comprises the battery device 100 or the battery monomer 1, and the battery device 100 or the battery monomer 1 is used for storing or providing electric energy. The battery device 100 and the battery monomer 1 in the embodiment are the same as those in the above embodiments, and the related description of the battery device 100 and the battery monomer 1 in the above embodiments is referred to.

[0250] The energy storage device provided by the embodiment of the present application adopts the battery monomer 1 or the battery device 100, which is helpful to improve the energy density of the energy storage device.

[0251] As one of the embodiments of the present application, as shown in ​As shown, the battery device 100 comprises a battery cell assembly 10 and a busbar component 20, the battery cell assembly 10 comprises a plurality of battery cells 1, two adjacent battery cells 1 are electrically connected by the busbar component 20. The battery cell 1 comprises an outer shell 11, an electrode assembly 12 and an electrode terminal 13, the electrode assembly 12 is arranged in the outer shell 11. The outer shell 11 is provided with a first wall 1121 at one end along a first direction Z, and is provided with a second wall 1111 at both ends along a second direction X. The electrode terminal 13 is arranged on the first wall 1121 and is electrically connected to the electrode assembly 12. In the first direction Z, the side of the electrode terminal 13 away from the electrode assembly 12 is provided with a mounting groove 101, one end of the mounting groove 101 along the second direction X is provided with a slot 102, the second wall 1111 is provided with a first groove 104 along the second direction X, and the slot 102 is communicated between the mounting groove 101 and the first groove 104 along the second direction X. The busbar component 20 is inserted into the mounting groove 101, the slot 102 and the first groove 104, and extends out of the second wall 1111 along the second direction X. The busbar component 20 and the electrode terminal 13 are welded to achieve electrical connection between the busbar component 20 and the battery cell 1. The first direction Z and the second direction X are perpendicular.

[0252] The above only is the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, The system includes a battery cell assembly and a busbar component. The battery cell assembly includes multiple battery cells, and adjacent battery cells are electrically connected through the busbar component. Each battery cell includes: shell; Electrode assembly, disposed within the housing; An electrode terminal is insulated and disposed on a first wall of the housing along a first direction. The electrode terminal has a mounting groove on the side away from the electrode assembly along the first direction. A portion of the busbar component is inserted into the mounting groove and electrically connected to the electrode terminal.

2. The battery device according to claim 1, characterized in that, The mounting groove has a slot at one end along the second direction, and the busbar extends through the slot to the outside of the electrode terminal. The first direction and the second direction intersect.

3. The battery device according to claim 2, characterized in that, The electrode terminal protrudes out of the first wall along the first direction, and the slot is provided on the portion of the electrode terminal that protrudes out of the first wall along the first direction.

4. The battery device according to claim 2, characterized in that, The first wall is provided with an electrode lead-out hole through the first direction, and at least a portion of the electrode terminal is inserted into the electrode lead-out hole; The outer casing has a second wall along the second direction, and the second wall has a first groove extending through it along the second direction. The first groove and the groove opening are distributed and connected along the second direction, and part of the confluence component is located in the first groove.

5. The battery device according to claim 4, characterized in that, The first groove and the electrode lead-out hole are distributed along the second direction and are connected.

6. The battery device according to claim 5, characterized in that, The battery cell further includes an insulating structure, at least a portion of which is disposed within the electrode lead-out hole and surrounds the outer periphery of the electrode terminal; the insulating structure includes a first insulating portion disposed between the second wall and the electrode terminal, the first insulating portion having a second groove, the second groove communicating between the groove opening and the first groove, and a portion of the busbar component being located within the second groove.

7. The battery device according to any one of claims 1-6, characterized in that, The electrode terminals and the busbar are welded together at the inner peripheral wall of the mounting groove.

8. The battery device according to any one of claims 1-6, characterized in that, One of the mounting slot and the busbar component is provided with a positioning part, and the other is provided with a positioning slot, wherein the positioning part is inserted into the positioning slot.

9. The battery device according to claim 8, characterized in that, The positioning part or the positioning groove is provided on the inner peripheral wall of the mounting groove.

10. The battery device according to any one of claims 2-6, characterized in that, One of the mounting groove and the busbar component is provided with a positioning part, and the other is provided with a positioning groove. The positioning part is inserted into the positioning groove. The mounting groove is provided with the positioning part or the positioning groove along the inner peripheral wall of the third direction. The third direction intersects with the first direction, and the second direction intersects with the third direction.

11. The battery device according to any one of claims 2-6, characterized in that, The electrode terminals include a positive electrode terminal and a negative electrode terminal. In the battery cell, the positive electrode terminal and the negative electrode terminal are spaced apart on the same first wall along the second direction. In the positive electrode terminal, the slot is located at one end of the mounting groove away from the negative electrode terminal along the second direction. In the negative electrode terminal, the slot is located at one end of the mounting groove away from the positive electrode terminal along the second direction.

12. The battery device according to any one of claims 2-6, characterized in that, The battery cell assembly includes multiple rows of battery cells arranged along a third direction, and each row of battery cells includes multiple battery cells arranged along the second direction; the number of the current-collecting components is multiple, and the multiple current-collecting components include a first current-collecting component and a second current-collecting component; In each row of battery cells, the electrode terminals of two adjacent battery cells are electrically connected through the first busbar component; The electrode terminals of two adjacent rows of battery cells are electrically connected through the second busbar, and a portion of the second busbar and the battery cells are distributed along the second direction; The third direction intersects the first direction and the second direction.

13. The battery device according to any one of claims 1-6, characterized in that, The battery device further includes a housing, which includes a first housing and a second housing. In the first direction, the second housing is disposed at one end of the first housing near the first wall, and the battery cell assembly is disposed within the space formed by the first housing and the second housing. The battery device further includes a first adhesive layer, which is bonded between the second housing and the first wall of the outer casing near the second housing to fix the second housing and the battery cell assembly.

14. The battery device according to claim 13, characterized in that, The battery device further includes an information acquisition component, which is disposed on the first wall and electrically connected to the electrode terminals. The first adhesive layer is disposed to avoid the information acquisition component.

15. The battery device according to claim 13, characterized in that, In the first direction, a second adhesive layer is bonded between the outer shell away from the wall of the second housing and the first housing.

16. The battery device according to claim 13, characterized in that, The first housing includes two first sidewalls opposite each other along a second direction and two second sidewalls opposite each other along a third direction. The battery cell assembly is located between the two first sidewalls along the second direction and between the two second sidewalls along the third direction. The first direction, the second direction, and the third direction intersect each other.

17. A single battery cell, characterized in that, include: shell; Electrode assembly, disposed within the housing; An electrode terminal is insulated on a first wall of the housing along a first direction and is used for electrical connection with a busbar component. The electrode terminal has a mounting groove on the side away from the electrode assembly along the first direction, and the mounting groove is used for insertion into the busbar component.

18. The battery cell according to claim 17, characterized in that, The first wall is provided with an electrode lead-out hole through the first direction, and at least a portion of the electrode terminal is inserted into the electrode lead-out hole; The mounting groove has an opening at one end along the second direction; The outer shell is provided with a second wall along the second direction, and the second wall is provided with a first groove through it along the second direction. The first groove and the groove opening are distributed and communicate with each other along the second direction. The first direction and the second direction intersect.

19. The battery cell according to claim 18, characterized in that, The battery cell further includes an insulating structure, at least a portion of which is disposed within the electrode lead-out hole and surrounds the outer periphery of the electrode terminal; the insulating structure includes a first insulating portion disposed between the second wall and the electrode terminal, the first insulating portion having a second groove, the second groove communicating between the groove opening and the first groove.

20. An electrical appliance, characterized in that, It includes the battery device according to any one of claims 1-16; or, it includes the battery cell according to any one of claims 17-19.

21. An energy storage device, characterized in that, Includes a battery device according to any one of claims 1-16 or a battery cell according to any one of claims 17-19, wherein the battery device or the battery cell is used to store or provide electrical energy.

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