Battery device, power utilization device and energy storage device

Abstract

The invention provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a shell, a confluence assembly, a sampling assembly and a plurality of single batteries, the shell comprises a box body and a cover body, a plurality of battery monomers are accommodated in the box body, and the cover body covers an opening of the box body; the confluence assembly is electrically connected with the plurality of battery monomers, and the confluence assembly is provided with a first clamping part, and the first clamping part comprises at least one bulge; the sampling assembly is connected to the inner side, facing the box body, of the cover body, the sampling assembly is provided with a second clamping part, the second clamping part comprises at least one clamping groove used for being clamped with the at least one protrusion in a one-to-one correspondence mode, the clamping groove comprises a through groove, and first openings are formed in the two ends of the through groove in the maximum expansion direction of the single batteries; and the second clamping part is used for being connected with the first clamping part in a clamping manner when the cover body covers the box body. The sampling assembly and the confluence assembly can be rapidly disassembled, and the sampling assembly can be prevented from being pulled by the through grooves when the battery monomers expand.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Art

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

[0003] In related technologies, batteries transmit power and signals through a cell contacting system (CCS), which consists of a busbar and a flexible printed circuit (FPC) soldered to the busbar. However, if the FPC is damaged, it can be difficult to remove from the busbar, potentially rendering the entire battery useless. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a battery device, an electrical device, and an energy storage device to improve the problem that a flexible printed circuit board is difficult to remove from a busbar.

[0005] An embodiment of the first aspect of the present application provides a battery device, comprising: the battery device comprises: multiple battery cells, a shell, a bus assembly and a sampling assembly; the shell comprises a box body and a cover body, the box body accommodates multiple battery cells, and the cover body covers the opening of the box body; the bus assembly is electrically connected to the multiple battery cells, and the bus assembly has a first clamping portion, the first clamping portion includes at least one protrusion; the sampling assembly is connected to the inner side of the cover body facing the box body, and the sampling assembly has a second clamping portion, the second clamping portion includes at least one clamping groove for one-to-one clamping with at least one protrusion, the clamping groove includes a through groove with a first opening at both ends along the maximum expansion direction of the battery cell, and the second clamping portion is used to be clamped and connected with the first clamping portion when the cover body is closed with the box body, so as to realize the electrical connection between the sampling assembly and the bus assembly through the electrical connection between the first clamping portion and the second clamping portion.

[0006] In this embodiment, the sampling assembly is mounted on the cover. When the cover is closed onto the housing, the sampling assembly can be mounted and electrically connected to the busbar assembly through the engagement of the first and second engagement portions. This eliminates the need for additional insulating sheets, simplifies the assembly process, reduces costs, and eliminates the need for reserved assembly space, thereby improving the energy density of the battery device. Furthermore, if a fuse blows or the sampling assembly is damaged, the sampling assembly can be quickly and easily removed from the busbar assembly by disconnecting the first and second engagement portions, without having to scrap the entire battery device. The busbar assembly and sampling assembly are connected and electrically connected through the engagement of the slot and protrusion, resulting in a simple and easy-to-implement structure. By configuring the slot as a through slot, the protrusion on the busbar assembly can move relative to the slot in the event of battery cell expansion, thereby preventing the sampling assembly from being pulled. Furthermore, a stable electrical connection between the sampling assembly and the busbar assembly can be achieved. In some embodiments, a first connecting portion is provided on the inner side of the cover body, a first mating portion is provided on the sampling assembly, and the first connecting portion is positioned and connected with the first mating portion; a second connecting portion is also provided on the cover body, a second mating portion is provided on the confluence assembly, and the second connecting portion is positioned and connected with the second mating portion.

[0007] In this embodiment, the first connecting portion and the first mating portion enable the cover to be positioned and connected to the sampling assembly, while the second connecting portion and the second mating portion enable the cover to be positioned and connected to the confluence assembly. When the cover and the housing are assembled, the sampling assembly and the confluence assembly can be precisely positioned, i.e., the first engaging portion and the second engaging portion can be precisely engaged, thereby improving the accuracy and reliability of the connection between the sampling assembly and the confluence assembly. Furthermore, the sampling assembly and the confluence assembly can be precisely positioned solely by the positioning connection of the cover, requiring fewer components and resulting in higher positioning accuracy.

[0008] In some embodiments, the first connecting portion includes at least one first connecting hole, the first mating portion includes at least one first mating hole, and the first connecting hole is detachably connected to the first mating hole through a first fastener; the second connecting portion is arranged at the edge of the cover body, the second connecting portion includes at least one second connecting hole, the second mating portion is arranged at the edge of the convergence assembly, the second mating portion includes at least one second mating hole, and the second fastener can pass through the second connecting hole and the second mating hole and be detachably connected to the box body.

[0009] In this embodiment, the sampling assembly and the cover body can be disassembled by connecting the first fastener with the first connecting hole and the first matching hole. When a problem occurs with the sampling assembly, it can be easily replaced without scrapping the entire battery device, thereby reducing production losses. At the same time, the sampling assembly and the cover body can be installed and positioned, and the structure is simple.

[0010] In some embodiments, the sampling assembly includes a sampling body extending along a first direction and a first conductive member connected to both ends of the sampling body along a second direction, the second engaging portion is provided on the first conductive member, and a first matching portion is provided on both the sampling body and the first conductive member; wherein the first direction is arranged perpendicular to the second direction.

[0011] In this embodiment, by providing a first conductive member on the edge of the sampling body and disposing the first mating portion and the second engaging portion on the first conductive member, the positioning error between the second engaging portion and the cover can be further reduced, thereby reducing the positioning error between the first engaging portion and the second engaging portion, thereby improving the engagement accuracy. In addition, the electrical connection between the sampling assembly and the confluence assembly can be directly achieved through the engagement of the first engaging portion and the second engaging portion.

[0012] In some embodiments, a portion of the sampling body located around the first conductive member is provided with a first hollow portion penetrating the sampling body.

[0013] In this embodiment, the first hollow portion can form notches and holes on the sampling body, thereby reducing the rigidity of this part and improving the deformation capacity. When the battery cell expands, the first hollow portion can undergo adaptive deformation to avoid pulling the sampling body and causing damage to the sampling body.

[0014] In some embodiments, the slot includes a first section and a second section connected in sequence along the depth direction of the slot, and the bottom of the slot is located in the second section; taking the section perpendicular to the depth direction of the slot as the cross section, the first section is used to clamp the protrusion, the cross-sectional area of ​​the second section is larger than the cross-sectional area of ​​the first section, and the cross-sectional area of ​​the second section gradually increases from one end close to the first section to the end away from the first section.

[0015] In this embodiment, by providing a first section and a second section connected thereto, the first section can achieve a tight connection between the protrusion and the slot, and the second section can apply pressure to the first section, thereby improving the reliability of the engagement.

[0016] In some embodiments, a first receiving groove is provided on the inner side of the cover body, and the first receiving groove is used to receive at least a portion of the card slot.

[0017] In this embodiment, a first receiving groove is provided inside the cover so that at least a portion of the card slot protruding from the sampling body can be located in the first receiving groove, thereby effectively improving the space utilization of the battery device and enhancing its energy density.

[0018] In some embodiments, the busbar assembly includes an insulating portion and a conductive portion connected to the insulating portion, the conductive portion is electrically connected to a plurality of battery cells, and the first engaging portion is disposed at an edge of the conductive portion.

[0019] In this embodiment, the provision of a conductive portion and an insulating portion enables the current collection function of the current collecting assembly to be realized while facilitating connection with the housing and cover, thereby facilitating installation and positioning. The first engaging portion is provided on the conductive portion, thereby simultaneously achieving an engaging connection and an electrical connection between the sampling assembly and the conductive portion, resulting in a simple structure.

[0020] In some embodiments, the insulating portion and the conductive portion are processed into an integral piece through an integral molding process, or the insulating portion is an insulating film for mounting the conductive portion.

[0021] Both of the above methods can realize the processing and forming of the confluence component, and can realize the connection with the sampling component through a snap connection, and the processing method is simple and reliable.

[0022] In some embodiments, the conductive portion includes a plurality of second conductive members, the second conductive members are welded to the electrode terminals of the battery cells, and the insulating portion located between two adjacent second conductive members is provided with a second hollow portion penetrating the insulating portion.

[0023] In this embodiment, the second hollow portion can form notches and holes on the insulating portion, thereby reducing the rigidity of the portion and improving deformation capacity. When the battery cell expands, the second hollow portion can adaptively deform to avoid pulling the bus assembly and causing damage to the bus assembly.

[0024] In some embodiments, a second receiving groove is provided on a surface of the insulating portion facing the cover body, and the second receiving groove is used to receive at least a portion of the sampling assembly.

[0025] This embodiment provides installation space for the sampling assembly by setting a second receiving groove on the insulating part, thereby compressing the volume of the battery device and improving the energy density. At the same time, the thickness of the insulating part can be reduced, which can reduce the weight of the insulating part while ensuring insulation and improving the energy density.

[0026] In some embodiments, the sampling assembly includes a support and a temperature sensor connected to the support. The confluence assembly is provided with a temperature measurement opening corresponding to the temperature sensor. The temperature measurement opening is used to allow the temperature sensor to be connected to a temperature measurement point of the battery cell.

[0027] In this embodiment, the support member allows the temperature sensor to be accurately installed with moderate pressure, which is beneficial to the accuracy of temperature measurement, and the temperature measurement opening can realize heat transfer between the temperature sensor and the temperature measurement point, facilitating the detection of the temperature of the battery cell.

[0028] In some embodiments, the sampling assembly includes a connector arranged at one end of the sampling assembly, a BMS is arranged in the box body, and the BMS includes a connector base. The connector is used to be plugged into the connector base when the cover body and the box body are closed.

[0029] In this embodiment, a connector base is provided on the BMS, and a connector plugged into the connector base is provided in the sampling assembly, so that when the cover is closed, the sampling assembly and the BMS are connected to facilitate signal transmission, and the assembly steps can be simplified, thereby improving assembly efficiency.

[0030] In some embodiments, the bus assembly has an output part for outputting current, a total output part is provided in the box body, a first through hole is provided on the output part, a second through hole is provided on the total output part, and an output part base is also provided in the box body, and a threaded connection part passes through the first through hole and the second through hole and is screwed to the output part base.

[0031] This embodiment achieves mechanical robustness and low contact resistance for high-current output through the connection between the main output unit and the output unit. Furthermore, compared to the related art method of soldering an FPC to a busbar, the busbar assembly can be connected to the main output unit before the sampling assembly is installed, resulting in a stable and reliable connection.

[0032] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0033] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery device in the above embodiment, and the energy storage device is used to store electrical energy.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0036] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application; Figure 2 Schematic diagram of the exploded structure of a battery device according to some embodiments of the present application; Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application; Figure 4 for Figure 2 A partial enlarged view of point A in the middle; Figure 5 for Figure 2 Schematic diagram of part of the structure inside the middle box; Figure 6 for Figure 2 Schematic diagram of the structure of the sampling component; Figure 7 for Figure 6 A partial enlarged view of point C in the middle; Figure 8 This is a partial enlarged view of a sampling component in another embodiment of the present application; Figure 9 for Figure 2 Back view of the central busbar assembly; Figure 10 A schematic diagram of the engagement of the first engaging portion and the second engaging portion provided in this embodiment; Figure 11 for Figure 10 Schematic cross-section diagram of ; Figure 12 for Figure 6 A partial enlarged view of point D in the middle; Figure 13 for Figure 2 A partial enlarged view of the connector; Figure 14 for Figure 5 A partial enlarged view of point B in the middle.

[0037] Description of reference numerals: Vehicles 1000; Battery device 100, controller 200, motor 300; Battery cell 11, end cap 12, housing 13, electrode assembly 14, electrode terminal 15; The busbar assembly 400 , the first engaging portion 410 , the protrusion 411 , the insulating portion 420 , the second hollow portion 421 , the second receiving groove 422 , the conductive portion 430 , the second conductive member 431 , the temperature measuring opening 440 , the output portion 450 , and the first through hole 451 ; Sampling assembly 500, second engaging portion 510, slot 511, first section 5111, second section 5112, sampling body 520, first hollow portion 521, first conductive member 530, extension portion 531, temperature sensor 540, support member 550, connector 560; BMS 600, connector base 610; First connecting portion 710 , first connecting hole 711 , first matching portion 720 , first matching hole 721 , second connecting portion 730 , second connecting hole 731 , second matching portion 740 , second matching hole 741 , first fastener 750 , second fastener 760 ; Shell 20 , box body 21 , cover body 22 , first receiving groove 23 , main output part 24 , output part base 25 , threaded connector 26 , second through hole 27 . DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0041] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, a and / or b can represent: a exists alone, a and b exist simultaneously, and b exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0046] Currently, market developments indicate that rechargeable batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in various electronic devices, including electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, market demand is also growing.

[0047] In related technologies, batteries transmit power and signals through a CCS, which consists of a busbar and a flexible circuit board soldered to the busbar. During installation, the CCS must first be soldered to the cells within the battery case, then an insulating sheet is attached to the CCS, and finally the cover is installed. However, this solution is complex and requires additional insulating sheet material.

[0048] Furthermore, in the related art, in order to avoid squeezing the CCS due to assembly tolerance and other issues when the upper cover is installed, an assembly space is usually reserved between the upper cover and the CCS, resulting in a thicker upper cover and lower energy density of the battery.

[0049] In addition, the FPC in the CCS is directly welded to the busbar. When the FPC fuse blows abnormally or the FPC is damaged during the production process, it is difficult to remove the FPC from the busbar alone. Therefore, the entire battery often needs to be scrapped.

[0050] Furthermore, in order to cope with the expansion of the battery cells in the related art, the FPC substrate needs to be designed with an anti-expansion structure, which results in an increase in the width of the FPC, affects the design space of the busbar, and the panelization rate of the FPC substrate is low.

[0051] In order to improve at least one of the above problems, the present application provides a battery device, an electrical device and an energy storage device, wherein the battery device includes: multiple battery cells, a shell, a bus assembly and a sampling assembly; the shell includes a box body and a cover body, the box body accommodates multiple battery cells, and the cover body covers the opening of the box body; the bus assembly is electrically connected to the multiple battery cells, and the bus assembly has a first clamping portion, the first clamping portion includes at least one protrusion; the sampling assembly is connected to the inner side of the cover body facing the box body, and the sampling assembly has a second clamping portion, the second clamping portion includes at least one clamping groove for one-to-one clamping with at least one protrusion, the clamping groove includes a through groove with a first opening at both ends along the maximum expansion direction of the battery cell, and the second clamping portion is used to be clamped and connected with the first clamping portion when the cover body is closed with the box body, so as to realize the electrical connection between the sampling assembly and the bus assembly through the electrical connection between the first clamping portion and the second clamping portion. This embodiment mounts the sampling assembly to the cover. When the cover is closed with the housing, the sampling assembly can be mounted and electrically connected to the busbar assembly through the engagement of the first and second engaging portions. This eliminates the need for additional insulating sheets, simplifies the assembly process, reduces costs, and eliminates the need for reserved assembly space, thereby increasing the energy density of the battery device. Furthermore, if the sampling assembly fuse blows or is damaged, the first and second engaging portions can be disconnected, allowing for quick and convenient removal from the busbar assembly without the need to scrap the entire battery device. Furthermore, the through-slot allows the protrusion to move relative to the slot in the event of battery cell expansion, thereby preventing the sampling assembly from being pulled.

[0052] The technical solutions described in the embodiments of the present application are applicable to battery devices, power-consuming devices using battery devices, and energy storage devices.

[0053] In the embodiments of the present application, an energy storage device utilizing a battery device as a power source includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0054] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output electrical energy at appropriate times. For example, energy storage devices can store electrical energy during low-consumption periods and provide electrical energy to relevant users or electrical devices during peak periods. The energy storage system provided in the embodiments of the present application can be any power system that requires an energy storage device. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0055] In the embodiments of the present application, the electrical devices using the battery device as a power source may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] It should be understood that the technical solutions described in the embodiments of this application are not limited to the energy storage devices and power-consuming devices described above. However, for the sake of simplicity, the following embodiments are all described using a vehicle as an example of a power-consuming device.

[0057] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be provided at the bottom, head or tail 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 an 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 power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0058] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0059] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application.

[0060] The battery apparatus 100 (Battery Apparatus) mentioned in the embodiments of the present application may include a housing 20 and a plurality of battery cells 11. The battery cells 11 are housed in the housing 20 to provide voltage and capacity. The housing 20 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepipeds, cylinders, or spheres. The housing 20 may be made of an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0061] As an example, the housing 20 may include a box body 21 and a cover body 22. The box body 21 and the cover body 22 are connected to form an enclosed space within the housing 20 to accommodate the battery cells 11. Enclosed here means covered or closed, and can be non-sealed or sealed to prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 11. The cover body 22 may be a top cover.

[0062] In some embodiments, the shell 20 can be used as a part of the chassis structure of the vehicle. For example, part of the shell 20 can become at least a part of the floor of the vehicle, or part of the shell 20 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0063] A bus assembly 400 and a sampling assembly 500 may be provided inside the housing 20 . Multiple battery cells 11 are connected in series, parallel or in mixed connection through the bus assembly 400 . The sampling assembly 500 is electrically connected to the bus assembly 400 to collect temperature, voltage and other signals of the battery cells 11 .

[0064] In some embodiments, as Figure 2 As shown, the battery device 100 may be a battery pack, and the housing 20 may be a battery pack housing.

[0065] In addition, the plurality of battery cells 11 may constitute a plurality of battery modules, and the plurality of battery modules may be housed in the housing 20 .

[0066] As an example, the battery device 100 may also be a battery module, which is formed by arranging and fixing multiple battery cells 11 to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells 11 with a cable tie, and the housing 20 may be a battery module housing.

[0067] The battery cell 11 provided in the embodiment of the present application may be a secondary battery. A secondary battery refers to a battery cell 11 that can be continuously used by activating active materials by charging after the battery cell 11 is discharged.

[0068] The battery cell 11 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0069] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. A battery cell 11 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 11 includes an end cap 12, a shell 13, an electrode assembly 14, an electrode terminal 15 and other functional components.

[0070] The end cap 12 is a component that covers the opening of the housing 13 to isolate the internal environment of the battery cell 11 from the external environment. The shape of the end cap 12 can be adapted to the shape of the housing 13 to fit the housing 13. In some embodiments, the end cap 12 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation during compression and collision, providing the battery cell 11 with greater structural strength and improved safety. The end cap 12 can be provided with electrode terminals 15 and other functional components. The electrode terminals 15 can be used to electrically connect to the electrode assembly 14 to transmit or receive electrical energy from the battery cell 11. In some embodiments, the end cap 12 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold. The end cap 12 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating member may be provided inside the end cap 12 to isolate the engaging components in the housing 13 from the end cap 12 to reduce the risk of short circuit.

[0071] The housing 13 is a component that cooperates with the end cap 12 to form the internal environment of the battery cell 11, wherein the formed internal environment can be used to accommodate the electrode assembly 14, electrolyte, and other components. The housing 13 and the end cap 12 can be independent components. An opening can be provided in the housing 13, and the end cap 12 is closed at the opening to form the internal environment of the battery cell 11. The end cap 12 and the housing 13 can also be integrated. Specifically, the end cap 12 and the housing 13 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 13 needs to be encapsulated, the end cap 12 is closed to the housing 13. The housing 13 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 13 can be determined according to the specific shape and size of the electrode assembly 14. The housing 13 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0072] The electrode assembly 14 is the component within the battery cell 11 where the electrochemical reaction occurs. One or more electrode assemblies 14 may be contained within the housing 13. Electrode assembly 14 is primarily formed by winding a positive electrode sheet and a negative electrode sheet, typically with a separator between the two. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly.

[0073] Figure 4 for Figure 2 A partial enlarged view of point A in the middle. Figure 5 for Figure 2 Schematic diagram of part of the structure inside the middle box; Figure 6 for Figure 2 Schematic diagram of the structure of the sampling component, Figure 7 for Figure 6 A partial enlarged view of point C in the middle; Figure 8 This is a partial enlarged view of a sampling component in another embodiment of the present application; Figure 9 for Figure 2 Back view of the central busbar assembly; Figure 10 A schematic diagram of the engagement of the first engaging portion and the second engaging portion provided in this embodiment; Figure 11 for Figure 10 Please refer to the cross-sectional diagram of Figures 2 to 11The embodiment of the present application provides a battery device 100, comprising: a housing 20, a bus assembly 400, a sampling assembly 500, and a plurality of battery cells 11; the housing 20 comprises a box 21 and a cover 22, the box 21 accommodates the plurality of battery cells 11, and the cover 22 covers the opening of the box 21; the bus assembly 400 is electrically connected to the plurality of battery cells 11, and the bus assembly 400 has a first engaging portion 410, the first engaging portion 410 including at least one protrusion 411; the sampling assembly 500 is connected to the cover 22 and faces the box 21 The inner side of the sampling assembly 500 has a second engaging portion 510, and the second engaging portion 510 includes at least one engaging groove 511 for engaging with at least one protrusion 411 in a one-to-one correspondence, and the engaging groove 511 includes a through groove with a first opening at both ends along the maximum expansion direction of the battery cell; the second engaging portion 510 is used to engage and connect with the first engaging portion 410 when the cover body 22 is covered with the box body 21, so as to realize the electrical connection between the sampling assembly 500 and the convergence assembly 400 through the electrical connection between the first engaging portion 410 and the second engaging portion 510.

[0074] In this embodiment, the housing 20 may include a box body 21 and a cover body 22. Figure 2 In the embodiment, the box body 21 may have a receiving cavity, and the top thereof may have an opening, and the cover body 22 may be connected to cover the opening to realize the connection between the box body 21 and the cover body 22.

[0075] As the structural foundation of the entire battery assembly, the housing 21 must provide a stable, flat mounting platform for the battery cells, ensuring accurate stacking and mechanical stability. Furthermore, the housing 21 forms a protective barrier at the bottom of the battery assembly, directly protecting it from external impacts and environmental damage such as flying rocks, scratches, and accumulated water, and is crucial to maintaining the structural integrity of the battery assembly.

[0076] The box 21 can accommodate multiple battery cells 11, and the multiple battery cells can be arranged in an array, such as Figure 2 The battery device 100 can include two columns of battery cells, and the busbar assembly 400 can be installed on top of these battery cells 11. The busbar assembly can electrically connect the positive and negative electrodes of the battery cells or battery modules in a series-parallel relationship to form the required total voltage and capacity output circuit. Specifically, the busbar assembly 400 can be welded to the electrode terminals 15 of the battery cells 11 to connect multiple battery cells 11. The busbar assembly 400 can be used to transmit current, realizing the series, parallel, or mixed connection of the battery cells 11.

[0077] At the same time, the bus assembly 400 also provides a physical interface for connecting voltage sampling points.

[0078] The cover 22 serves as a key component for sealing and protecting the top of the battery device. It can also be highly integrated with the sampling assembly to form a "sampling platform," providing the physical carrier and interface for collecting signals from the battery device. It is understood that the cover 22 can be a plate-like structure and can be made of an insulating material such as plastic, or a composite injection molding of plastic and metal. For example, the inner surface of the cover 22 facing the housing 21 can be an insulating surface, and the sampling assembly 500 can be disposed on this insulating surface. The sampling assembly 500 can be connected to the cover 22 by bonding, screwing, or snapping.

[0079] The sampling assembly 500, as a neural network structure for signal acquisition, can be used to collect temperature or voltage signals from battery cells. The busbar assembly 400 has a first engaging portion 410, and the sampling assembly 500 has a second engaging portion 510. When the cover 22 and the housing 21 are closed, the first engaging portion 410 and the second engaging portion 510 can be engaged and connected.

[0080] It can be understood that the sampling component 500 can be precisely installed on a preset fixed point on the inner side of the cover body by positioning installation, and the convergence component 400 can also be positioned and installed with the box body. When the cover body and the box body are positioned and installed, the correspondence between the sampling component 500 and the convergence component 400 can be achieved, that is, the first clamping portion 410 can be aligned with the second clamping portion 510 and clamped together.

[0081] In addition, the first engaging portion 410 and the second engaging portion 510 may also be made of a conductive material, so that when the first engaging portion 410 and the second engaging portion 510 are engaged and connected, the first engaging portion 410 and the second engaging portion 510 can be electrically connected, thereby achieving an electrical connection between the confluence assembly 400 and the sampling assembly 500.

[0082] It can be understood that in some embodiments, the first engaging portion may be a voltage sampling point, and voltage sampling may be achieved through the connection between the first engaging portion 410 and the second engaging portion 510 .

[0083] In this embodiment, the first engaging portion 410 may include one or more protrusions 411, which may be provided on the busbar assembly 400 and protrude toward the cover 22. The protrusions 411 may have various shapes, such as strips, balls, blocks, and the like.

[0084] The second engaging portion may include one or more engaging slots 511 . The number of the engaging slots 511 may be consistent with the number of the protrusions, and the two may correspond one to one. The shape of the engaging slots 511 may match the shape of the protrusion 411 , thereby achieving engagement between the two.

[0085] It can be understood that the maximum expansion direction of the battery cell can be the direction in which the battery cell is most likely to expand and deform. Figure 3The maximum expansion direction of the square battery cell is the first direction X, which is the width direction of the battery cell. When the battery cells are arranged and installed in the box, the maximum expansion direction can also be Figure 2 The first direction X in .

[0086] like Figure 7 and Figure 10 The slot 511 may be a through slot with open ends. The through slot may extend along the first direction X (the direction of maximum expansion). The cross-sectional shape of the slot 511 may be configured according to circumstances.

[0087] When the battery cell expands, it will cause the bus assembly to deform, causing the connection position between the bus assembly and the sampling assembly to deform along the direction of maximum expansion. By setting the slot as a through slot, the protrusion on the bus assembly can be allowed to move relative to the slot, thereby avoiding pulling the sampling assembly.

[0088] In addition, by setting the dimensions of the slot 511 along the first direction X and the dimensions of the protrusion 411 along the first direction X, the slot 511 can still be matched with the protrusion 411 after expansion and deformation, thereby stably achieving electrical connection. It can be understood that during the installation of the battery device in this embodiment, the sampling assembly 500 can be pre-installed on the cover 22, the battery cell 11 can be installed in the box 21, and then the bus assembly 400 is connected to the top surface of the battery cell 11. Then, the cover 22 is closed on the opening of the box 21. At this time, the engagement connection between the protrusion and the slot can be realized, thereby achieving electrical connection through the contact between the slot and the protrusion, and further achieving electrical connection between the bus assembly 400 and the sampling assembly 500.

[0089] In this embodiment, the number of the sampling components 500 can be one or more, and can be set according to the arrangement of the battery cells, for example, Figure 2 Two rows of battery cells are shown, which can be provided with two sampling assemblies 500 respectively. The bus assembly 400 can be fixed and electrically connected to the two sampling assemblies 500 by snapping together.

[0090] In addition, in this embodiment, the battery device 100 can be a battery pack or a battery module, and the specific configuration can be based on the needs. The battery cells 11 can also be pre-formed into a battery module, and the battery module is installed in the housing to form a battery device.

[0091] It can be understood that in the related art, the flexible circuit board and the bus are pre-welded into a CCS, and then the CCS is installed on the battery cell of the battery box. Since the flexible circuit board is generally set on the bus, it is easily damaged by other components or tools. Therefore, after installing the CCS, it is necessary to stick an insulating sheet on the surface to play an insulating protection role before the upper cover is installed to avoid damage to the flexible circuit board.

[0092] In this embodiment, by installing the sampling assembly on the cover body, when the cover body is closed with the box body, the sampling assembly can be installed and electrically connected to the convergence assembly through the clamping of the first clamping part and the second clamping part. Compared with the solution of first installing the CCS and then pasting the insulating sheet in the related art, there is no need to set an insulating sheet and no need to set an insulating sheet installation process. Therefore, materials can be saved, costs can be reduced, and at the same time, the installation process can be simplified.

[0093] In addition, the sampling assembly is directly installed on the cover body, and there is no need to reserve assembly space on the inside of the cover body, which can reduce the thickness of the cover body and improve the energy density of the battery.

[0094] Moreover, since the sampling assembly and the bus assembly are connected by snapping, when the sampling assembly has a fuse that blows or is damaged, the sampling assembly and the bus assembly can be quickly and conveniently disassembled by disconnecting the snap connection between the first snapping portion and the second snapping portion, without having to scrap the entire battery device, thereby reducing production losses.

[0095] In this embodiment, the snap connection and electrical connection between the confluence component and the sampling component are achieved by snapping together the slots and the protrusions, which has a simple structure and is easy to implement.

[0096] By setting the card slot as a through slot, the protrusion on the bus assembly can be allowed to move relative to the card slot when the battery cell expands, thereby avoiding pulling the sampling assembly. At the same time, a stable electrical connection between the sampling assembly and the bus assembly can be achieved.

[0097] According to some embodiments of the present application, a first connecting portion 710 is provided on the inner side of the cover body 22, and the sampling assembly 500 is provided with a first mating portion 720, and the first connecting portion 710 is positioned and connected with the first mating portion 720; the cover body 22 is also provided with a second connecting portion 730, and the confluence assembly 400 is provided with a second mating portion 740, and the second connecting portion 730 is positioned and connected with the second mating portion 740.

[0098] In this embodiment, a first connecting portion 710 can be provided in the cover body 22, and a first matching portion 720 can be provided on the sampling assembly 500. One of the first connecting portion 710 and the first matching portion 720 can be a first positioning groove, and the other can be a first positioning column. The two can be inserted into the first positioning groove through the first positioning column to realize the positioning connection between the cover body 22 and the sampling assembly 500.

[0099] In addition, a second connecting portion 730 may be provided on the cover body 22, and a second mating portion 740 may be provided on the convergence assembly 400. One of the second connecting portion 730 and the second mating portion 740 may also be a second positioning groove, and the other may be a second positioning column. Both may be inserted into the second positioning groove by the second positioning column to realize the positioning connection between the cover body 22 and the convergence assembly 400.

[0100] It can be understood that in addition to the positioning methods of the above-mentioned positioning grooves and positioning columns, the positioning connections between the first connecting part 710 and the first matching part 720, the second connecting part 730 and the second matching part 740 can also have other positioning structures, for example, positioning can be achieved by aligning the positioning holes, which can be specifically set according to actual conditions.

[0101] In this embodiment, the first connecting portion and the first mating portion enable the cover to be positioned and connected to the sampling assembly, while the second connecting portion and the second mating portion enable the cover to be positioned and connected to the confluence assembly. When the cover and the housing are assembled, the sampling assembly and the confluence assembly can be precisely positioned, i.e., the first engaging portion and the second engaging portion can be precisely engaged, thereby improving the accuracy and reliability of the connection between the sampling assembly and the confluence assembly. Furthermore, the sampling assembly and the confluence assembly can be precisely positioned solely by the positioning connection of the cover, requiring fewer components and resulting in higher positioning accuracy.

[0102] According to some embodiments of the present application, the first connecting portion 710 includes at least one first connecting hole 711, the first mating portion 720 includes at least one first mating hole 721, and the first connecting hole 711 is detachably connected to the first mating hole 721 through a first fastener 750; the second connecting portion 730 is arranged at the edge of the cover body 22, the second connecting portion 730 includes at least one second connecting hole 731, the second mating portion 740 is arranged at the edge of the convergence assembly 400, the second mating portion 740 includes at least one second mating hole 741, and the second fastener 760 can penetrate the second connecting hole 731 and the second mating hole 741 and be detachably connected to the box body 21.

[0103] It is understood that the first connection portion 710 may include one or more first connection holes 711 ( Figure 4 The position shown in 711 is the first connecting hole 711 on the cover body exposed through the first matching hole 721). A plurality of first connecting holes 711 can be dispersedly arranged on the sampling component 500. For example, the sampling component 500 can be arranged along Figure 2 The plurality of first connection holes 711 may extend in the first direction X, and may be spaced apart along the first direction X in the sampling assembly 500 .

[0104] Correspondingly, the first matching portion 720 on the sampling assembly 500 may also include one or more first matching holes 721 , and the first connecting holes 711 may correspond one-to-one with the first matching holes 721 , for example, the hole diameters of the two may be the same.

[0105] The first fastener 750 may be a detachable fastener such as a screw or a rivet (detachable) to achieve a detachable connection between the sampling assembly 500 and the cover. Figure 4 In the figure, the first fastener 750 is shown in the form of an exploded view. The first fastener 750 can pass through the first connecting hole 711 and be connected with the first matching hole 721, so as to accurately install the sampling component 500 at the preset installation position of the cover body 22.

[0106] Similarly, the second connection portion 730 may include one or more second connection holes 731, and these second connection holes 731 may be provided at the edge of the cover 22, such as Figure 2 As shown, a plurality of second connection holes 731 may be evenly distributed around the edges of the cover body 22 .

[0107] The second matching portion 740 may also include one or more second matching holes 741. The second matching holes 741 may also be provided at the edge of the bus assembly 400. Figure 2 As shown, the area of ​​the busbar assembly 400 in the XY plane can be roughly the same as the area of ​​the cover body 22 in the XY plane after it is closed. A plurality of second matching holes 741 can be evenly distributed around the edges of the busbar assembly 400. The first direction X can be the length direction of the box body 21, Y can be the second direction perpendicular to the first direction X, and can be the width direction of the box body 21, and Z can be the direction perpendicular to both the first direction X and the second direction Y, and can be the height direction of the box body 21. In addition, Figure 2 The XYZ directions are based on the direction of the box. Since the cover 22 is in the open state, its direction does not match the XYZ directions. Unless otherwise specified, the directions of the subsequent cover and sampling assembly are based on the direction in which it is covered on the box.

[0108] In addition, one or more mounting holes can also be evenly distributed on the edge of the box body 21. It can be understood that the second connecting hole, the second matching hole and the mounting hole can correspond one to one, and the second fastener 760 can pass through the second connecting hole 731 and the second matching hole 741 in sequence and be connected with the mounting hole.

[0109] It will be appreciated that in this embodiment, the edge of the bus assembly 400 can be mounted between the cover 22 and the housing 21. The second fastener 760 can also be used to connect the housing 21 and the cover 22. During the connection process, the second fastener 760 can pass through the second mating hole on the bus assembly 400 to achieve a fixed connection between the cover 22 and the bus assembly 400. The second fastener 760 can be a detachable fastener such as a screw or a rivet (detachable), thereby achieving detachability between the cover and the housing.

[0110] In this embodiment, the sampling assembly and the cover body can be disassembled by connecting the first fastener with the first connecting hole and the first matching hole. When a problem occurs with the sampling assembly, it can be easily replaced without scrapping the entire battery device, thereby reducing production losses. At the same time, the sampling assembly and the cover body can be installed and positioned, and the structure is simple.

[0111] The second fastener, the second connecting hole and the second matching hole can be used to utilize the connection structure between the box body and the cover body to achieve the positioning between the convergence assembly and the cover body, thereby simplifying the structure. At the same time, compared with the positioning connection between the convergence assembly and the box body, the positioning connection between the box body and the cover body, and the positioning connection between the cover body and the sampling assembly, the number of components involved in the positioning process can be reduced, thereby accurately achieving the positioning of the convergence assembly and the sampling assembly, and accurately achieving the snap connection between the first snap part and the second snap part, which is beneficial to improving the accuracy and reliability of the connection between the sampling assembly and the convergence assembly.

[0112] Please refer to Figure 6 as well as Figure 7 According to some embodiments of the present application, the sampling assembly 500 includes a sampling body 520 extending along a first direction X and a first conductive member 530 connected to both ends of the sampling body 520 along a second direction Y. The second engaging portion 510 is disposed on the first conductive member 530, and a first mating portion 720 is disposed on both the sampling body 520 and the first conductive member 530. The first direction X is perpendicular to the second direction Y.

[0113] The sampling body 520 may be a circuit body of the sampling assembly 500, for example, it may be an FPC. The sampling body 520 may extend along the first direction X, that is, along the length direction of the battery device 100. Figure 6 One or more first conductive members 530 may be provided at both end edges of the sampling body 520 along the second direction. The first conductive member 530 may be made of a conductive material such as a nickel sheet, and may serve as a key voltage sampling point connector. Multiple first conductive members 530 are usually arranged in groups, corresponding to the sampling position of each module or battery cell group.

[0114] The first conductive member 530 can be used to connect the sampling body 520 and the bus assembly 400. It can be understood that the FPC has a certain degree of flexibility, and by providing the first conductive member 530 with good rigidity on it, it can be easily engaged with the bus assembly 400 to achieve voltage sampling.

[0115] Additionally, the second engaging portion 510 can be provided on the first conductive member 530. In some embodiments, the engaging slots 511 can be located along the edges of the sampling body 520, for example, at both ends of the sampling body 520 along the second direction Y. In other embodiments, the engaging slots 511 can be provided at the end of the first conductive member away from the sampling body 520 to engage with the busbar assembly 400. The first mating portion 720 can also be provided on the first conductive member 530. For example, the first conductive member 530 can be provided with one or more first mating holes 721. Correspondingly, the inner side of the cover 22 can be provided with first connection holes 711 corresponding to the first mating holes 721, thereby achieving precise positioning of the first conductive member and the cover 22. It can be understood that since the second engaging portion 510 is also provided on the first conductive member 530, by providing the first mating portion 720 directly on the first conductive member 530, the positioning error between the second engaging portion 510 and the cover can be further reduced, thereby reducing the positioning error between the first engaging portion and the second engaging portion 510, thereby improving the engagement accuracy.

[0116] In some embodiments, the slot can be formed by bending the first conductive member 530 , thereby simplifying the processing steps. At the same time, the bent second engaging portion can have a certain degree of elasticity, which is more conducive to the engaging connection.

[0117] In some embodiments, when the materials of protrusion 411 and the slot are different, protrusion 411 (first engaging portion) or the slot (second engaging portion) may be plated to enhance electrical conductivity between the two. For example, the slot may be made of nickel, and protrusion 411 may be made of copper or aluminum. The surface of protrusion 411 may be nickel-plated to enhance electrical conductivity when the two are engaged.

[0118] It is understood that when the first conductive member is a nickel sheet, it has a certain degree of elasticity. When the cover is closed, the bent slot formed by the nickel sheet can be precisely pressed against the protrusion on the busbar assembly. The elastic pressure of the nickel sheet ensures stable, low-resistance electrical contact between the voltage sampling point (protrusion) and the nickel sheet, thereby accurately collecting the voltage signal of the battery cell.

[0119] In some embodiments, as Figure 7 The first conductive member 530 further includes an extending portion 531 located between the second engaging portion 510 and the sampling body 520 . The extending portion 531 extends along the second direction Y and protrudes from an edge of the sampling body 520 .

[0120] It is understandable that the extension portion 531 can provide installation space for the first matching portion 720, and at the same time, the second engaging portion 510 can slightly protrude from the sampling body 520, avoiding the problem of assembly interference caused by the sampling body 520 and the confluence component being too close during the engaging connection.

[0121] In this embodiment, by providing a first conductive member on the edge of the sampling body and disposing the first mating portion and the second engaging portion on the first conductive member, the positioning error between the second engaging portion and the cover can be further reduced, thereby reducing the positioning error between the first engaging portion and the second engaging portion, thereby improving the engagement accuracy. In addition, the electrical connection between the sampling assembly and the confluence assembly can be directly achieved through the engagement of the first engaging portion and the second engaging portion.

[0122] According to some embodiments of the present application, Figure 7 As shown, a portion of the sampling body 520 located around the first conductive member 530 is provided with a first hollow portion 521 penetrating through the sampling body 520 .

[0123] It is understood that the sampling body 520 can be roughly in the form of a sheet, and the first hollow portion 521 can be provided around the connection between the first conductive member 530 and the sampling body 520. The first hollow portion can penetrate the sampling body in a direction perpendicular to the sampling body 520, that is, in the third direction Z, so that the two sides of the sampling body can be connected through the first hollow portion. The first hollow portion 521 can include a notch or hole provided on the sampling body 520, for example, Figure 7 The long strip notch in the middle, holes can be set at both ends of the notch. Of course, the first hollow part 521 can also have other shapes.

[0124] It is understood that the first hollow portion 521 may extend along the maximum expansion direction of the battery cell. The maximum expansion direction of the battery cell may be the direction in which the battery cell is most likely to expand and deform. Figure 3 The maximum expansion direction of the square battery cell is the first direction X, which is the width direction of the battery cell. When the battery cells are arranged and installed in the box, the maximum expansion direction can also be Figure 2 The first direction X in .

[0125] The first hollow portion 521 can form notches and holes on the sampling body 520, thereby reducing the rigidity of this part and improving the deformation ability. When the battery cell expands, the first hollow portion 521 can adapt and deform to avoid pulling the sampling body and causing damage to the sampling body.

[0126] Please refer to Figure 8In some embodiments, the first hollow portion 521 may not be provided on the sampling body 520. In this case, no additional space is required on the sampling body 520 for the first hollow portion 521, thereby reducing the width of the sampling body 520 along the second direction Y, improving the splicing rate of the FPC substrate, and providing sufficient space for the design of the busbar assembly.

[0127] It can be understood that when the first hollow portion 521 is not provided, the solution provided in this embodiment can be used for battery cells that do not expand significantly, or the expansion deformation can be released by the locking shape between the first locking portion and the second locking portion, which will be specifically described in the following embodiments.

[0128] like Figure 11 As shown, according to some embodiments of the present application, the slot 511 includes a first section 5111 and a second section 5112 connected in sequence along the depth direction of the slot 511, and the bottom of the slot 511 is located in the second section 5112; taking the section perpendicular to the depth direction of the slot 511 as the cross section, the first section 5111 is used to clamp the protrusion 411, the cross-sectional area of ​​the second section 5112 is greater than the cross-sectional area of ​​the first section 5111, and the cross-sectional area of ​​the second section 5112 gradually increases from one end close to the first section 5111 to the end away from the first section 5111.

[0129] In this embodiment, the depth direction of the slot 511 can be Figure 11 In the up and down directions, and the depth gradually increases from bottom to top, the first section 5111 can be located at the lower end of the second section 5112.

[0130] When engaged, the cross-sectional area of ​​the first section 5111 is the same as the cross-sectional area of ​​the protrusion 411. The first section 5111 can fit the protrusion 411 to clamp the protrusion. The cross-sectional area of ​​the second section 5112 can be larger than the protrusion 411, so that there is a certain space between the protrusion 411 and the side wall of the second section 5112.

[0131] Additionally, the cross-sectional area of ​​the second segment 5112 may be along Figure 11 It decreases from top to bottom and is roughly a contracted trapezoidal surface, so that when engaged, the second section 5112 can apply a force to the first section 5111 to contract it, so that the first section can clamp the protrusion to achieve a stable and reliable connection.

[0132] In some embodiments, the end of the first section facing away from the second section may have a guide section, and the cross-sectional area of ​​the guide section increases from the end close to the first section to the end away from the first section, thereby playing a guiding role, facilitating the protrusion 411 to enter the interior of the slot, and improving the situation where the protrusion and the slot cannot be engaged due to errors.

[0133] In this embodiment, by providing a first section and a second section connected thereto, the first section can achieve a tight connection between the protrusion and the slot, and the second section can apply pressure to the first section, thereby improving the reliability of the engagement.

[0134] According to some embodiments of the present application, Figure 4 As shown, a first receiving groove 23 is provided on the inner side of the cover body 22 , and the first receiving groove 23 is used to receive at least a portion of the card slot 511 .

[0135] The cover body 22 may have a substantially planar inner surface, and a first receiving groove 23 may be provided at a position corresponding to the card slot 511 . The depth of the first receiving groove 23 may be set according to the depth dimension of the card slot 511 .

[0136] It can be understood that the cover body 22 can be provided with one or more first accommodating grooves 23. When multiple first accommodating grooves 23 are provided, each first accommodating groove 23 can accommodate one or more card slots 511. Alternatively, one first accommodating groove 23 can be provided, and all the card slots 511 can be accommodated in the first accommodating groove 23.

[0137] Figure 4 In the embodiment, a first receiving groove 23 can be provided on both sides of each sampling component 500 , and the first receiving groove can extend along the first direction, so that the multiple slots 511 on each side of the sampling component 500 can be engaged in a first receiving groove 23 .

[0138] In this embodiment, the first receiving groove 23 is provided on the inner side of the cover 22 so that at least the portion of the card slot 511 protruding from the sampling body can be located in the first receiving groove, thereby effectively improving the space utilization of the battery device and enhancing its energy density.

[0139] According to some embodiments of this application, please refer to Figure 5 and Figure 9 The busbar assembly 400 includes an insulating portion 420 and a conductive portion 430 connected to the insulating portion 420 . The conductive portion 430 is electrically connected to the plurality of battery cells 11 . The first engaging portion 410 is disposed at an edge of the conductive portion 430 .

[0140] The bus assembly 400 may include an insulating portion 420 and a conductive portion 430 . The insulating portion may be made of insulating materials such as plastic and rubber, and the conductive portion 430 may be made of conductive materials such as copper, aluminum or alloy.

[0141] like Figure 9 In the embodiment, the conductive portion 430 may include a plurality of sheet-like structures, which may be used to connect the electrode terminals 15 of two adjacent battery cells. For example, the sheet-like structures may be welded to the electrode terminals 15 to achieve series and parallel connection of the battery cells.

[0142] The insulating portion 420 can be used to cover or support the conductive portion 430. It is understood that portions of the conductive portion 430 (key connection points) can be exposed to the insulating portion 420 to facilitate welding of the conductive portion 430 to the battery cell 11. In addition, the second mating portion 740 can be provided on the insulating portion 420 to facilitate connection to the housing 21.

[0143] The first engaging portion 410 may be provided on the conductive portion 430 , for example, may be formed by bending the edge of the conductive portion 430 , thereby achieving an electrical connection between the sampling assembly and the conductive portion 430 while achieving an engaging connection.

[0144] In this embodiment, the provision of a conductive portion and an insulating portion enables the current collection function of the current collecting assembly to be realized while facilitating connection with the housing and cover, thereby facilitating installation and positioning. The first engaging portion is provided on the conductive portion, thereby simultaneously achieving an engaging connection and an electrical connection between the sampling assembly and the conductive portion, resulting in a simple structure.

[0145] According to some embodiments of the present application, the insulating portion 420 and the conductive portion 430 are processed into an integral piece through an integral molding process, or the insulating portion 420 is an insulating film for mounting the conductive portion 430 .

[0146] In this embodiment, the insulating portion 420 and the conductive portion 430 can be connected in a variety of ways. For example, the insulating portion 420 and the conductive portion 430 can be formed by integrally molding dissimilar materials, such as through 3D printing or two-shot injection molding. This method offers the advantages of high efficiency and reliability. Taking injection molding as an example, the conductive portion, which has been precisely bent and formed, is precisely pre-positioned within a custom injection mold cavity. An engineering plastic (such as PPA (polyphthalamide) or PBT (polybutylene terephthalate), a material with excellent electrical insulation, high temperature resistance, and mechanical strength) is then injected under high pressure. The plastic is then wrapped around the conductive portion (windows are reserved for necessary connection points), forming a rigid component with a strong structure, high integration, and excellent electrical insulation and mechanical protection. The high rigidity and dimensional stability of the integral molding process can reduce subsequent assembly errors, significantly improving component rigidity and vibration resistance, and simplifying the final assembly of the battery device.

[0147] For another example, the insulating portion 420 may be an insulating film, and the conductive portion 430 may be mounted within the insulating film, thereby forming the busbar assembly 400. Specifically, the conductive portion may be pre-attached to a flexible or rigid insulating film (such as a PET (Polyethylene Terephthalate) film or an engineering plastic sheet) to form the busbar assembly. During final assembly of the battery device, the busbar assembly with the insulating film is placed on top of the assembled battery cells to facilitate automated placement.

[0148] In addition, no matter which of the above methods is used to process the bus assembly, after it is placed on the top of the battery cell, the conductive part with the reserved window on the bus assembly can be welded to the electrode terminal of the battery cell through high-precision laser welding and other technologies, so that the bus assembly can be pre-precisely welded and fixed on the designated sampling point of the corresponding battery cell or battery module.

[0149] Both of the above methods can realize the processing and forming of the confluence component, and can realize the connection with the sampling component through a snap connection, and the processing method is simple and reliable.

[0150] According to some embodiments of the present application, continue to refer to Figure 9 The conductive portion 430 includes a plurality of second conductive members 431 , which are welded to the electrode terminals 15 of the battery cells 11 , and the insulating portion 420 located between two adjacent second conductive members 431 is provided with a second hollow portion 421 penetrating the insulating portion 420 .

[0151] The second conductive member 431 may be made of a conductive material, such as aluminum or copper, and may be a sheet-like structure. The second conductive member 431 may be welded to the electrode terminals 15 of two adjacent battery cells 11 to achieve connection between the battery cells.

[0152] Additionally, a second hollow portion 421 may be provided on the insulating portion 420 between adjacent second conductive members 431. The second hollow portion can extend through the insulating portion in a direction perpendicular to the insulating portion, i.e., in the third direction Z, thereby allowing communication between the two sides of the insulating portion 420. The second hollow portion 421 may include a notch or hole. For example, it may be a long, rectangular notch similar to the first hollow portion, with holes provided at both ends. Of course, the second hollow portion 421 may also have other shapes. It is understood that the second hollow portion 421 may extend along the direction of maximum expansion of the battery cell.

[0153] in addition, Figure 9 4 columns of second conductive elements 431 are shown along the first direction. Between two adjacent second conductive elements 431 may refer to between two adjacent second conductive elements in each row, or may refer to the second conductive elements adjacent to each other in the middle two rows along the second direction Y.

[0154] The second hollow portion 421 can form notches and holes on the insulating portion, thereby reducing the rigidity of the portion and improving deformation capacity. When the battery cell expands, the second hollow portion 421 can adaptively deform to avoid pulling the bus assembly and causing damage to the bus assembly.

[0155] According to some embodiments of this application, please refer to Figure 2 and Figure 5 A second receiving groove 422 is provided on the surface of the insulating portion 420 facing the cover body 22 . The second receiving groove 422 is used to receive at least part of the sampling assembly 500 .

[0156] According to the above analysis, the bus assembly 400 can be roughly a planar plate-shaped structure, and the conductive portion 430 can be set at a position corresponding to the electrode terminal. Since there is a certain distance between the two electrode terminals of each battery cell, the second accommodating groove 422 can be set at a position corresponding to the space between the two electrode terminals on the insulating portion 420, thereby providing space for the installation of the sampling assembly 500.

[0157] For example, Figure 2 FIG shows two groups of battery cells 11 arranged along the first direction X, which can form four rows of electrode terminals, and correspondingly four rows of second conductive members (such as Figure 9 ), two sampling components 500 can be provided for two groups of battery cells 11, and each sampling component 500 can be correspondingly provided between two rows of electrode terminals of the same group of battery cells.

[0158] It can be understood that a second accommodating groove 422 can be provided at a position corresponding to the insulating portion 420 and the sampling component 500, and the first engaging portion 410 can be provided at an edge of the second accommodating groove 422. When the cover 22 is installed on the box body 21, at least a portion of the sampling component 500 in the third direction can be accommodated in the second accommodating groove 422, and the second engaging portion at the edge of the sampling component 500 can be engaged with the first engaging portion at the edge of the first accommodating groove 23, thereby rationally utilizing the box space, thereby further reducing the volume of the battery device and improving the energy density.

[0159] This embodiment provides installation space for the sampling assembly by setting a second receiving groove on the insulating part, thereby compressing the volume of the battery device and improving the energy density. At the same time, the thickness of the insulating part can be reduced, which can reduce the weight of the insulating part while ensuring insulation and improving the energy density.

[0160] Figure 12 for Figure 6 Please refer to the enlarged view of the D part in the middle. Figure 5 and Figure 12According to some embodiments of the present application, the sampling assembly 500 includes a support member 550 and a temperature sensor 540 connected to the support member 550. The bus assembly 400 is provided with a temperature measuring opening 440 corresponding to the temperature sensor 540. The temperature measuring opening 440 is used to allow the temperature sensor 540 to be connected to the temperature measuring point of the battery cell 11.

[0161] The sampling component may include a temperature sensor 540 , which may be an NTC (Negative Temperature Coefficient) thermistor, for directly collecting temperature data of the battery cell.

[0162] In order to install the temperature sensor 540 , the sampling assembly 500 may further include a support 550 . The temperature sensor 540 may be installed on the support 550 . The support 550 is used to precisely fix and position the temperature sensor.

[0163] The support member 550 may also be provided with a first matching portion 720 so that it can be positioned and connected with the first connecting portion 710 on the cover body, for example, fixed to the cover body by a first fastener, so that the temperature sensor 540 can be accurately installed.

[0164] It is understood that the temperature sensor 540 can detect the temperature of a temperature measuring point of the battery cell. It is understood that the temperature measuring point can be the surface of the battery cell, or other predetermined temperature measuring point. To enable direct or indirect heat transfer between the temperature sensor and the temperature measuring point, the insulating portion 420 can be provided with a temperature measuring opening 440. The temperature measuring opening 440 can penetrate the bus assembly 400 along the third direction Z. The temperature sensor can be provided corresponding to the temperature measuring opening 440. When the cover is closed and connected to the box body, the temperature sensor can directly contact or indirectly transfer heat to the temperature measuring point through the temperature measuring opening.

[0165] Temperature measurement opening 440 can be a window reserved in the busbar assembly. When the cover is closed, the temperature sensing surface (detection surface) of temperature sensor 540 can directly contact the temperature measurement point on the surface of the battery cell or a preset temperature measurement point inside the box. In addition, a thermal pad can be placed on the temperature sensing surface to ensure rapid temperature response and high accuracy. The thermal pad can be made of thermally conductive silicone, etc., and can be bonded between the temperature measurement point and the temperature sensing surface to achieve rapid heat conduction.

[0166] In this embodiment, the support member allows the temperature sensor to be accurately installed with moderate pressure, which is beneficial to the accuracy of temperature measurement, and the temperature measurement opening can realize heat transfer between the temperature sensor and the temperature measurement point, facilitating the detection of the temperature of the battery cell.

[0167] Figure 13 for Figure 2 For a partial enlarged view of the connector, please refer to Figure 2 and Figure 13 According to some embodiments of the present application, the sampling assembly 500 includes a connector 560 arranged at one end of the sampling assembly 500, a BMS 600 is arranged in the box body 21, and the BMS 600 includes a connector base 610. The connector 560 is used to be plugged into the connector base 610 when the cover body 22 and the box body 21 are closed.

[0168] A BMS (Battery Management System) can be provided in the box 21, for example Figure 2 The BMS is disposed in the box at one end along the first direction X. The BMS can be fixed to the side wall of the box or the internal bracket.

[0169] The sampling component 500 can be connected to the BMS, so that the collected voltage, temperature and other signals can be transmitted to the BMS, so that the BMS can manage and monitor the battery device.

[0170] It can be understood that a connector 560 may be provided at a position at one end of the sampling assembly 500 corresponding to the BMS. For example, the connector 560 may be provided at one end of the sampling assembly 500 along the first direction X.

[0171] The BMS 600 may be provided with a connector base 610. During the closing process of the cover and the box, the connector 560 may be directly aligned with and plugged into the connector base 610 of the BMS, forming a complete low-voltage signal path and achieving a high-speed and reliable electrical connection between the sampling component and the BMS, so as to facilitate the transmission of signals such as voltage and temperature.

[0172] The connector and connector base can be in the form of a common plug and socket that can be plugged in, and can be configured according to actual conditions. In addition, when multiple sampling assemblies 500 are provided, each sampling assembly can be provided with a connector, and the BMS can also be provided with the same number of connector bases as connectors, so that each connector can be plugged into the BMS to achieve the collection and transmission of all signals.

[0173] In addition, in order to achieve the plug-in connection between the connector and the connector base, a through hole may be further provided on the insulating portion of the busbar assembly so that the connector can pass through the through hole and be plug-in installed with the connector base.

[0174] In some embodiments, as Figure 13 The connector 560 may also be provided with a first mating portion 720, such as a first mating hole 721, and the cover body 22 may be provided with a first connecting portion. The first connecting portion and the first mating portion 720 are used to realize the positioning connection between the connector 560 and the cover body, so that when the cover body is closed on the box body, the connector 560 can be accurately plugged into the connector base.

[0175] In this embodiment, a connector base is provided on the BMS, and a connector plugged into the connector base is provided in the sampling assembly, so that when the cover is closed, the sampling assembly and the BMS are connected to facilitate signal transmission, and the assembly steps can be simplified, thereby improving assembly efficiency.

[0176] This embodiment can pre-utilize the cover space to integrate the sampling assembly on the cover to form an integral module, and the busbar assembly is pre-welded and positioned in the box. When the cover is installed, the first and second clamping parts are automatically engaged and the connector and the connector base are blindly plugged in, thereby achieving highly automated sampling, high-reliability assembly and signal transmission, effectively reducing manufacturing costs and failure rates, and improving the overall performance and safety of the battery device.

[0177] Figure 14 for Figure 5 Please refer to the enlarged view of the part B in the middle. Figure 14 and Figure 2 According to some embodiments of the present application, the bus assembly 400 has an output part 450 for outputting current, a total output part 24 is provided in the box body 21, a first through hole 451 is provided on the output part 450, a second through hole 27 is provided on the total output part 24, and an output part base 25 is also provided in the box body 21, and a threaded connection part 26 passes through the first through hole 451 and the second through hole 27 and is screwed to the output part base 25.

[0178] It is understandable that the total positive electrode and the total negative electrode of the battery device are usually designed as poles with threaded holes, which are integrated on the busbar assembly 400 or led out through the conductive part on the busbar assembly 400.

[0179] Figure 14 The method of leading out the total positive electrode or the total negative electrode is shown in the figure. The total output part 24 can be connected to the total positive electrode or the total negative electrode. The output part 450 can be the current output end in the bus assembly 400, which can be a part of the conductive part. For example, the output part 450 can be located at one end of the conductive part along the first direction X. By connecting the output part 450 and the total output part 24, the output of the total current of multiple battery cells 11 can be achieved.

[0180] Specifically, the total output part can be provided with a second through hole 27, the output part can be provided with a first through hole 451, and the threaded connection part 26 can pass through the first through hole and the second through hole 27 and be screwed to the output part base 25, for example, screwed into the threaded hole on the output part base 25.

[0181] The main output part and the output part can be made of conductive metal such as copper or aluminum. The materials of the two can be the same or different so as to achieve electrical connection. The output part base can be made of insulating material.

[0182] It is understood that during assembly, the busbar assembly can be first installed on the top of the battery cell in the box, the conductive portion can be welded to the electrode terminal, and then a high-precision torque wrench can be used to lock the threaded connector 26 to the output unit base to achieve the connection between the main output unit and the output unit, achieving mechanical stability and low contact resistance for high-current output. In addition, compared to the related art method of welding FPC to the busbar, the busbar assembly can be connected to the main output unit before the sampling assembly is installed, and the connection is stable and reliable.

[0183] An embodiment of the present application provides an electrical device, which includes the battery device 100 in the above embodiment, and the battery device 100 is used to provide electrical energy.

[0184] Among them, electrical devices include transportation vehicles (such as vehicles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, electric tools, etc.

[0185] It can be understood that the electrical device provided in the present application uses any of the above-mentioned battery devices 100, and therefore, the electrical device has all the beneficial effects of the above-mentioned battery devices 100, which will not be described in detail here.

[0186] An embodiment of the present application provides an energy storage device, which includes the battery device 100 in the above embodiment, and the battery device 100 is used to store electrical energy.

[0187] Energy storage devices may include, but are not limited to, centralized energy storage devices (such as container energy storage devices), distributed energy storage devices, mobile energy storage devices, wearable energy storage devices, and the like.

[0188] It can be understood that the energy storage device provided in the present application uses any of the above-mentioned battery devices 100. Therefore, the energy storage device has all the beneficial effects of the above-mentioned battery devices 100, which will not be described in detail here.

[0189] This embodiment provides a battery device 100, comprising: a housing 20, a busbar assembly 400, a sampling assembly 500, and a plurality of battery cells 11; the housing 20 comprises a box 21 and a cover 22, the box 21 accommodating the plurality of battery cells 11, and the cover 22 covering the opening of the box 21; the busbar assembly 400 is electrically connected to the plurality of battery cells 11, and the busbar assembly 400 has a first engaging portion 410, the first engaging portion including at least one protrusion 411; the sampling assembly 500 is connected to the inner side of the cover 22 facing the box 21 , and the sampling assembly 500 has a second engaging portion 510, the second engaging portion 510 includes at least one engaging groove 511 for engaging with at least one protrusion 411 in a one-to-one correspondence, and the engaging groove 511 includes a through groove having a first opening at both ends along the maximum expansion direction of the battery cell; the second engaging portion 510 is used to engage and connect with the first engaging portion 410 when the cover body 22 is covered with the box body 21, so as to realize the electrical connection between the sampling assembly 500 and the convergence assembly 400 through the electrical connection between the first engaging portion 410 and the second engaging portion 510.

[0190] In some embodiments, a first connecting portion 710 is provided on the inner side of the cover body 22, and the sampling assembly 500 is provided with a first matching portion 720. The first connecting portion 710 includes at least one first connecting hole 711, and the first matching portion 720 includes at least one first matching hole 721. The first connecting hole 711 is detachably positioned and connected to the first matching hole 721 through a first fastener 750; the cover body 22 is also provided with a second connecting portion 730, and the convergence assembly 400 is provided with a second matching portion 740. The second connecting portion 730 is provided at the edge of the cover body 22, and the second connecting portion 730 includes at least one second connecting hole 731. The second matching portion 740 is provided at the edge of the convergence assembly 400, and the second matching portion 740 includes at least one second matching hole 741. The second fastener 760 can penetrate the second connecting hole 731 and the second matching hole 741 and be detachably positioned and connected to the box body 21.

[0191] The detachable connection allows for modular, non-destructive, and rapid assembly and disassembly of the sampling assembly, facilitating subsequent maintenance and replacement. When the battery cells expand, they cause the busbar assembly to deform, causing the connection between the busbar assembly and the sampling assembly to deform in the direction of maximum expansion. By configuring the slot as a through slot, the protrusion on the busbar assembly can move relative to the slot, preventing any pull on the sampling assembly.

[0192] The sampling assembly 500 includes a sampling body 520 extending along a first direction X and a first conductive member 530 connected to both ends of the sampling body 520 along a second direction Y. The second engaging portion 510 is disposed on the first conductive member 530. The first conductive member 530 may be a spring-type nickel sheet. The first engaging portion may be a protrusion disposed on the busbar assembly, and the second engaging portion may be a slot.

[0193] The sampling assembly 500 further includes a support member 550 connected to the cover and a temperature sensor 540 connected to the support member 550 . The bus assembly 400 is provided with a temperature measuring opening 440 corresponding to the temperature sensor 540 . The temperature measuring opening 440 is used to allow the temperature sensor 540 to be connected to the temperature measuring point of the battery cell 11 .

[0194] The sampling assembly 500 includes a connector 560 disposed at one end of the sampling assembly 500 . A BMS 600 is disposed in the box 21 . The BMS 600 includes a connector base 610 . The connector 560 is used to be plugged into the connector base 610 when the cover 22 and the box 21 are closed.

[0195] In this embodiment, when the cover (pre-installed with the sampling assembly) is aligned and snapped into place with the housing carrying the convergence assembly, the slots on the spring-type nickel sheets on either side of the sampling assembly automatically and reliably snap into place and press against the corresponding protrusions of the convergence assembly below, under mechanical guidance and without manual intervention. The temperature sensor can then directly contact the corresponding temperature pad to collect temperature. Furthermore, there's no need for additional support within the housing for the temperature sensor; after attaching the thermal pad to the temperature sensor, it can directly contact the corresponding temperature measurement point to collect temperature.

[0196] At the same time, the connector of the sampling component can be precisely inserted into the connector base reserved on the BMS mainboard as the cover falls into place, forming a complete low-voltage signal path. The key voltage and temperature information inside the battery device can be transmitted stably to the BMS for processing and monitoring through the busbar assembly, nickel sheet, sampling component, and connector.

[0197] The battery device provided in this embodiment can generally include three functional modules: a box body with structural bearing and protection functions, a busbar assembly with electrical busbars and connection cores, and a cover body (including a sampling assembly) with integrated signal acquisition and protection functions. It can achieve high modularity, which not only facilitates parallel production and quality control, but also greatly simplifies the final assembly process, improves assembly production efficiency, optimizes maintainability, and can achieve structural strength and electrical connection reliability, while realizing efficient thermal management and signal acquisition.

[0198] Furthermore, key fixing points on the support member, first conductive member, and sampling body can be provided with first mating portions, precisely corresponding to the first connecting portion and first fastener on the inner side of the cover. The first fastener can be a rivet or other structure. During assembly, each first mating hole on the sampling assembly can be inserted into the first fastener, achieving a quick and secure mechanical connection, eliminating the need for additional adhesive and improving assembly efficiency and reliability.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Multiple battery cells; The housing comprises a box body and a cover body, wherein the box body accommodates the plurality of battery cells, and the cover body is arranged to cover the opening of the box body; a busbar assembly electrically connected to the plurality of battery cells, wherein the busbar assembly has a first engaging portion, wherein the first engaging portion includes at least one protrusion; A sampling assembly is connected to the inner side of the cover body facing the box body, and the sampling assembly has a second engaging portion, the second engaging portion includes at least one engaging groove for engaging with the at least one protrusion in a one-to-one correspondence, the engaging groove includes a through groove having a first opening at both ends along the maximum expansion direction of the battery cell, and the second engaging portion is used to engage and connect with the first engaging portion when the cover body is closed with the box body, so as to realize the electrical connection between the sampling assembly and the convergence assembly through the electrical connection between the first engaging portion and the second engaging portion.

2. The battery device according to claim 1, wherein: The inner side of the cover is provided with a first connecting portion, the sampling assembly is provided with a first matching portion, and the first connecting portion is positioned and connected with the first matching portion; The cover body is further provided with a second connecting portion, and the confluence assembly is provided with a second matching portion, and the second connecting portion is positioned and connected with the second matching portion.

3. The battery device according to claim 2, characterized in that The first connecting portion includes at least one first connecting hole, the first matching portion includes at least one first matching hole, and the first connecting hole is detachably connected to the first matching hole via a first fastener; The second connecting portion is arranged on the edge of the cover body, the second connecting portion includes at least one second connecting hole, the second matching portion is arranged on the edge of the convergence assembly, the second matching portion includes at least one second matching hole, and the second fastener can pass through the second connecting hole and the second matching hole and be detachably connected to the box body.

4. The battery device according to claim 2, wherein: The sampling assembly includes a sampling body extending along a first direction and a first conductive member connected to both ends of the sampling body along a second direction, the second engaging portion is provided on the first conductive member, and the first matching portion is provided on both the sampling body and the first conductive member; The first direction is perpendicular to the second direction.

5. The battery device according to claim 4, characterized in that A portion of the sampling body located around the first conductive member is provided with a first hollow portion penetrating the sampling body.

6. The battery device according to any one of claims 1 to 5, characterized in that: The card slot comprises a first section and a second section sequentially connected along the depth direction of the card slot, and the bottom of the card slot is located in the second section; Taking the cross section perpendicular to the depth direction of the slot as the cross section, the first section is used to clamp the protrusion, the cross-sectional area of ​​the second section is larger than the cross-sectional area of ​​the first section, and the cross-sectional area of ​​the second section gradually increases from one end close to the first section to the end away from the first section.

7. The battery device according to claim 6, characterized in that A first accommodating groove is provided on the inner side of the cover body, and the first accommodating groove is used to accommodate at least a portion of the card slot.

8. The battery device according to any one of claims 1 to 5, characterized in that: The busbar assembly includes an insulating portion and a conductive portion connected to the insulating portion. The conductive portion is electrically connected to the plurality of battery cells. The first engaging portion is disposed at an edge of the conductive portion.

9. The battery device according to claim 8, characterized in that The insulating portion and the conductive portion are processed into an integral piece through an integral molding process, or the insulating portion is an insulating film for mounting the conductive portion.

10. The battery device according to claim 8, characterized in that The conductive portion includes a plurality of second conductive members, the second conductive members are welded to the electrode terminals of the battery cells, and the insulating portion located between two adjacent second conductive members is provided with a second hollow portion penetrating the insulating portion.

11. The battery device according to claim 8, characterized in that A second accommodating groove is provided on a surface of the insulating portion facing the cover body, and the second accommodating groove is used to accommodate at least a portion of the sampling assembly.

12. The battery device according to any one of claims 1 to 5, characterized in that: The sampling assembly includes a support and a temperature sensor connected to the support. The confluence assembly is provided with a temperature measurement opening corresponding to the temperature sensor. The temperature measurement opening is used to allow the temperature sensor to be connected to a temperature measurement point of the battery cell.

13. The battery device according to any one of claims 1 to 5, characterized in that: The sampling assembly includes a connector arranged at one end of the sampling assembly, a BMS is arranged in the box body, and the BMS includes a connector base. The connector is used to be plugged into the connector base when the cover body and the box body are covered.

14. The battery device according to any one of claims 1 to 5, characterized in that: The busbar assembly has an output part for outputting current, a total output part is provided in the box body, a first through hole is provided on the output part, a second through hole is provided on the total output part, an output part base is also provided in the box body, a threaded connector passes through the first through hole and the second through hole and is screwed to the output part base.

15. An electrical device, characterized in that: The electrical device comprises a battery device according to any one of claims 1 to 14, and the battery device is used to provide electrical energy.

16. An energy storage device, characterized in that: The energy storage device comprises a battery device according to any one of claims 1 to 14, and the battery device is used to store electrical energy.

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