Battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer assembly, a first sampling assembly and a second sampling assembly, the battery single body assembly comprises a plurality of battery single bodies which are stacked in the first direction, each battery single body comprises a shell, a positive terminal and a negative terminal, the shell comprises a first wall, the positive terminal and the negative terminal are arranged on the first wall at intervals in the second direction, and the second direction is perpendicular to the first direction; the first sampling assembly is at least partially arranged between the positive terminal and the negative terminal and is used for collecting information of a first battery monomer in the battery monomer assembly; and the second sampling assembly is at least partially arranged between the positive terminal and the negative terminal and is used for collecting information of a second battery monomer in the battery monomer assembly. According to the technical scheme, the assembling efficiency of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery device, an electrical device, and an energy storage device. Background Technology

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

[0003] In the manufacturing process of battery devices, assembly efficiency is a crucial factor. Therefore, improving assembly efficiency is a pressing technical challenge in battery device technology. Utility Model Content

[0004] This application provides a battery device, an electrical device, and an energy storage device, which can improve the assembly efficiency of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery device, which includes a battery cell assembly, a first sampling assembly, and a second sampling assembly; the battery cell assembly includes a plurality of battery cells stacked along a first direction, wherein a portion of the battery cells located upstream in the first direction are first battery cells, and the remaining battery cells located downstream in the first direction are second battery cells; the first sampling assembly is electrically connected to the first battery cells and is used to collect information of the first battery cells; the second sampling assembly is connected to the first sampling assembly and electrically connected to the second battery cells and is used to collect information of the second battery cells; along a second direction, the first sampling assembly and the second sampling assembly at least partially overlap, and the second direction is perpendicular to the first direction.

[0007] According to the battery device of this application embodiment, compared to collecting information of multiple battery cells in a battery cell assembly using a single sampling component, this application uses a first sampling component to collect information of a first battery cell and a second sampling component to collect information of a second battery cell. Along the second direction, the first and second sampling components at least partially overlap, which allows for efficient use of space in the second direction. This reduces the dimensions of the first and second sampling components in the third direction (perpendicular to both the first and second directions), lowers the assembly difficulty of the first and second sampling components, and facilitates assembly of the first and second sampling components with the battery cell assembly, thereby improving the assembly efficiency of the battery device. Simultaneously, the battery cell assembly can have a larger number of battery cells in the first direction, enabling the battery device to have a higher energy density.

[0008] According to some embodiments of this application, the number of first battery cells is multiple, and the number of second battery cells is multiple.

[0009] In the above scheme, multiple first battery cells and multiple second battery cells require a large number of sampling terminals and wires. Information of the first battery cells is collected by a first sampling component, and information of the second battery cells is collected by a second sampling component. For example, the first sampling component and the second sampling component can be stacked, or the first sampling component and the second sampling component can be arranged along a first direction to distribute a large number of wires, which facilitates the assembly of the first sampling component with the first battery cell and the assembly of the second sampling component with the second battery cell, thereby improving the assembly efficiency of the battery device.

[0010] According to some embodiments of this application, the first sampling component includes a first circuit board and a plurality of first sampling terminals, one end of the first sampling terminal is connected to the first circuit board and the other end is connected to a first battery cell; the second sampling component includes a second circuit board and a plurality of second sampling terminals, one end of the second sampling terminal is connected to the second circuit board and the other end is connected to a second battery cell; along the second direction, the first circuit board and the second circuit board at least partially overlap.

[0011] In the above scheme, the first circuit board is convenient for integrating wires and multiple first sampling terminals, and the second circuit board is convenient for integrating wires and multiple second sampling terminals. The first circuit board and the second circuit board overlap at least partially, and can utilize the space in the second direction to reduce the space occupied by the first circuit board and the second circuit board in the third direction. This facilitates the improvement of the assembly efficiency of the first sampling component and the first battery cell, the improvement of the assembly efficiency of the second sampling component and the second battery cell, and thus improves the assembly efficiency of the battery device.

[0012] According to some embodiments of this application, each battery cell includes a casing, a positive terminal, and a negative terminal. The casing includes a first wall, and the positive terminal and the negative terminal are spaced apart on the first wall along a third direction. The third direction, the second direction, and the first direction are perpendicular to each other. Along the third direction, a first circuit board and a second circuit board are both located between the positive terminal and the negative terminal.

[0013] In the above scheme, both the first circuit board and the second circuit board are located between the positive terminal and the negative terminal, which can reduce the risk of interference between the first sampling component and the first battery cell, and reduce the risk of interference between the second sampling component and the second battery cell, thereby facilitating the improvement of the assembly efficiency of the battery device.

[0014] According to some embodiments of this application, the first circuit board includes a first segment and a second segment, the first segment extends along a first direction, a first sampling terminal is disposed in the first segment, and one end of the second segment is connected to the first segment; along a second direction, the second circuit board overlaps with the second segment and is connected to the second segment; the first sampling component further includes a first connector, which is disposed at the end of the second segment away from the first segment; the second sampling component further includes a second connector, which is disposed at the end of the second circuit board away from the first segment.

[0015] In the above scheme, the first segment, the second segment, and the first connector are arranged along the first direction, the second circuit board overlaps with the second segment, and the first connector and the second connector are located at the same end of the battery cell assembly to facilitate the connection of the first connector and the second connector with other components (such as the battery monitoring unit, the battery management system, etc.), thereby improving the utilization rate of the internal space of the battery device and facilitating the improvement of the energy density of the battery device.

[0016] According to some embodiments of this application, along a third direction, the first connector and the second connector at least partially overlap, and the third direction, the second direction, and the first direction are perpendicular to each other.

[0017] In the above scheme, the first connector and the second connector at least partially overlap in a third direction, which can reduce the space occupied by the first connector and the second connector in the first direction, so as to improve the utilization rate of the internal space of the battery device and improve the energy density of the battery device.

[0018] According to some embodiments of this application, the second segment is bonded to the second circuit board by an adhesive layer.

[0019] In the above solution, the second segment is connected to the second circuit board through an adhesive layer, which is simple to operate and facilitates the improvement of the connection reliability between the second segment and the second circuit board.

[0020] According to some embodiments of this application, a first circuit board and a second circuit board are arranged along a first direction; the first sampling component further includes a first connector disposed at the end of the first circuit board away from the second circuit board; the second sampling component further includes a second connector disposed at the end of the second circuit board away from the first circuit board.

[0021] In the above scheme, the first circuit board and the second circuit board are arranged along the first direction and do not overlap in the second direction, which can reduce the space occupied by the first circuit board and the second circuit board in the second direction; the first connector is disposed at the end of the first circuit board away from the second circuit board, and the second connector is disposed at the end of the second circuit board away from the first circuit board, which can arrange the first connector and the second connector at both ends of the battery cell assembly along the first direction, which can reduce the risk of interference between the first sampling component and the second sampling component and facilitate the improvement of the assembly efficiency of the battery device.

[0022] According to some embodiments of this application, a first circuit board includes a first substrate and a plurality of first wires, the plurality of first wires being arranged on the same plane of the first substrate perpendicular to the second direction, and a first sampling terminal being electrically connected to the first wires; a second circuit board includes a second substrate and a plurality of second wires, the plurality of second wires being arranged on the same plane of the second substrate perpendicular to the second direction, and a second sampling terminal being electrically connected to the second wires.

[0023] In the above scheme, multiple first wires are arranged on the same plane perpendicular to the second direction of the first substrate, and multiple second wires are arranged on the same plane perpendicular to the second direction of the second substrate. This makes the space occupied by the first circuit board in the second direction smaller, and the space occupied by the second circuit board in the second direction smaller, which can reduce the space occupied by the first sampling component and the second sampling component in the second direction, and help improve the energy density of the battery device.

[0024] According to some embodiments of this application, the surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

[0025] In the above scheme, the surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell, which makes it easier to set more battery cells and improve the energy density of the battery device.

[0026] According to some embodiments of this application, the number of battery cells in the battery cell assembly is M, satisfying that M≥25.

[0027] In the above scheme, the information of the first battery cell and the second battery cell are collected through the first sampling component and the second sampling component. The number of battery cells in the battery cell assembly can be designed to be large. For example, the number of battery cells in the battery cell assembly M≥25, so that the battery device can have a high energy density.

[0028] Secondly, embodiments of this application also provide an electrical device, which includes a battery device according to any of the above embodiments, the battery device being used to provide electrical energy to the electrical device.

[0029] Thirdly, embodiments of this application also provide an energy storage device, which includes a battery device according to any of the above embodiments, the battery device being used to store electrical energy and capable of providing electrical energy.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0033] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0034] Figure 3 A schematic diagram of a portion of the structure of a battery device provided in some embodiments of this application;

[0035] Figure 4 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0036] Figure 5 for Figure 3 A magnified view of part A;

[0037] Figure 6 A schematic diagram illustrating the assembly state of a battery cell assembly with a first sampling assembly and a second sampling assembly, provided for some embodiments of this application;

[0038] Figure 7 A schematic diagram of the assembly state of the first sampling component and the second sampling component provided for some embodiments of this application;

[0039] Figure 8 for Figure 7 The provided structural diagrams of the first and second sampling components;

[0040] Figure 9 A schematic diagram showing the assembly state of a battery cell assembly with a first sampling assembly and a second sampling assembly, provided for other embodiments of this application;

[0041] Figure 10 This is a schematic diagram of the structure of the first sampling component provided in some embodiments of this application;

[0042] Figure 11 for Figure 10 A magnified view of section B;

[0043] Figure 12 This is a schematic diagram of the structure of the second sampling component provided in some embodiments of this application;

[0044] Figure 13 for Figure 12 A magnified view of a portion of point C.

[0045] Icons: 100 - Battery device; 10 - Battery cell assembly; 10a - First battery cell group; 11a - First battery cell; 10b - Second battery cell group; 11b - Second battery cell; 11 - Battery cell; 110 - Housing; 111 - First wall; 112 - Housing; 113 - End cap; 12 - Positive terminal; 13 - Negative terminal; 14 - Electrode assembly; 20 - First sampling assembly; 21 - First circuit board; 21a - First section; 21b - Second section; 211 - First substrate; 212 - 22-First sampling terminal; 23-First connector; 30-Second sampling assembly; 31-Second circuit board; 311-Second substrate; 312-Second wire; 32-Second sampling terminal; 33-Second connector; 40-Housing; 41-First sub-housing; 42-Second sub-housing; 43-Battery compartment; 44-Electrical compartment; 50-Bus unit; 60-Separator; 200-Controller; 300-Motor; 1000-Vehicle; X-First direction; Y-Third direction; Z-Second direction. Detailed Implementation

[0046] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0048] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0049] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0053] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0055] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0056] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0059] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0060] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0061] In some embodiments, the energy storage device includes a battery unit and an energy storage enclosure, with a door on at least one side of the enclosure. The energy storage device may include, but is not limited to, energy storage containers, energy storage cabinets, etc.

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0067] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0071] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0072] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0073] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0074] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0075] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0076] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0077] In some implementations, the electrode assembly is a stacked structure.

[0078] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as a copper-aluminum composite housing).

[0079] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0080] In some embodiments, the housing has two electrode terminals that are electrically connected to the tabs of the electrode assembly. The electrode terminals can be directly connected to the tabs or indirectly connected to the tabs via an adapter. The electrode terminals can be located on the end cap or on the housing.

[0081] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal pressure of the battery cells.

[0082] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0083] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0084] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the assembly efficiency of the battery device also needs to be considered.

[0085] In some embodiments, the battery device includes a housing and a battery cell assembly. The battery cell assembly is disposed within the housing and includes multiple battery cells. A positive and negative terminal are disposed on the first wall of each battery cell to facilitate the input or output of electrical energy. A sampling component is also included. The sampling component is used to collect information from the battery cells (such as temperature and / or voltage information) and transmit this information to a battery monitoring unit or battery management system. The positive and negative terminals are spaced apart on the first wall along the width of the sampling component. When the number of battery cells is large, the sampling component needs to have more sampling terminals, thus requiring more wires and increasing its width. This affects the assembly of the sampling component with the battery cells, potentially causing interference between the sampling component and the positive and negative terminals, making assembly more difficult and resulting in lower assembly efficiency of the battery device.

[0086] In view of this, to solve the problem of low assembly efficiency of battery devices due to difficulties in assembling sampling components and battery cells, this application provides a battery device including a battery cell assembly, a first sampling component, and a second sampling component. The battery cell assembly includes multiple battery cells stacked along a first direction, with the upstream portion of the multiple battery cells in the first direction being the first battery cells, and the remaining battery cells downstream in the first direction being the second battery cells. The first sampling component is electrically connected to the first battery cells and is used to collect information from the first battery cells in the battery cell assembly. The second sampling component is connected to the first sampling component and electrically connected to the second battery cells, and is used to collect information from the second battery cells in the battery cell assembly. Along a second direction, the first sampling component and the second sampling component at least partially overlap, and the second direction is perpendicular to the first direction. This battery device has high assembly efficiency.

[0087] In this battery device, compared to collecting information from multiple battery cells in a battery cell assembly using a single sampling component, this application uses a first sampling component to collect information from the first battery cell and a second sampling component to collect information from the second battery cell. Along the second direction, the first and second sampling components at least partially overlap, which allows for efficient use of space in the second direction. This reduces the dimensions of the first and second sampling components in the third direction (perpendicular to both the first and second directions), lowers the assembly difficulty of the first and second sampling components, and facilitates their assembly with the battery cell assembly, thereby improving the assembly efficiency of the battery device. Simultaneously, the battery cell assembly can accommodate more battery cells in the first direction, enabling the battery device to have a higher energy density.

[0088] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0089] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0090] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0091] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0092] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0093] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0094] Please refer to Figure 2 , Figure 2 This is an exploded view of the battery device provided in some embodiments of this application. Please refer to... Figure 2 The battery device 100 includes a housing 40 and a battery cell assembly 10, with the battery cell assembly 10 housed within the housing 40. The housing 40 provides space for the battery cell assembly 10, and the housing 40 can have various structures.

[0095] In some embodiments, the housing 40 may include a first sub-housing 41 and a second sub-housing 42, which overlap each other and together define a receiving space for accommodating the battery cell assembly 10. The second sub-housing 42 may be a hollow structure with one end open, and the first sub-housing 41 may be a plate-like structure, with the first sub-housing 41 covering the open side of the second sub-housing 42 so that the first sub-housing 41 and the second sub-housing 42 together define the receiving space; alternatively, the first sub-housing 41 and the second sub-housing 42 may both be hollow structures with one side open, with the open side of the first sub-housing 41 covering the open side of the second sub-housing 42.

[0096] In the battery device 100, the battery cell assembly 10 includes multiple battery cells 11, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that some of the multiple battery cells 11 are connected in series and others in parallel. The multiple battery cells 11 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 11 is housed in the housing 40.

[0097] Of course, the battery device 100 may also include multiple battery cell assemblies 10, with multiple battery cells 11 first connected in series, parallel or mixed to form a battery cell assembly 10, and then the multiple battery cell assemblies 10 connected in series, parallel or mixed to form a whole, which is housed in the housing 40.

[0098] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar 50 for realizing electrical connection between multiple battery cells 11.

[0099] Please refer to Figures 3 to 6 , Figure 3 This is a schematic diagram of a partial structure of a battery device provided in some embodiments of this application. Figure 4 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. Figure 5 for Figure 3 A magnified view of part A. Figure 6 This is a schematic diagram illustrating the assembly state of a battery cell assembly, a first sampling component, and a second sampling component according to some embodiments of this application. Embodiments of this application provide a battery device 100, which includes a battery cell assembly 10, a first sampling component 20, and a second sampling component 30. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X, wherein a portion of the battery cells 11 located upstream of the first direction X is a first battery cell 11a, and the remaining battery cells 11 located downstream of the first direction X are second battery cells 11b. The first sampling component 20 is electrically connected to the first battery cell 11a and is used to collect information from the first battery cell 11a. The second sampling component 30 is connected to the first sampling component 20 and electrically connected to the second battery cell 11b, and is used to collect information from the second battery cell 11b. Along a second direction Z, the first sampling component 20 and the second sampling component 30 at least partially overlap, and the second direction Z is perpendicular to the first direction X.

[0100] Figure 3 This can be a schematic diagram of the internal structure of the battery device 100. Figure 3 Only an assembly diagram of the battery cell assembly 10, the first sampling assembly 20, and the second sampling assembly 30 is shown.

[0101] When the battery device 100 includes a plurality of battery cell assemblies 10, each battery cell assembly 10 is provided with a first sampling component 20 and a second sampling component 30, so as to collect information of a plurality of battery cells 11 of the corresponding battery cell assembly 10 through the first sampling component 20 and the second sampling component 30. Figure 3 Two battery cell assemblies 10 are shown for ease of description. Figure 3 Only one of the battery cell assembly 10 is shown in the assembly diagram with the first sampling assembly 20 and the second sampling assembly 30.

[0102] In some embodiments, when the battery device 100 includes a plurality of battery cell assemblies 10, the plurality of battery cell assemblies 10 may be arranged in multiple rows along a third direction Y, with at least one battery cell assembly 10 in each row. In some embodiments, the plurality of battery cell assemblies 10 may also be stacked in a second direction Z, with the third direction Y, the second direction Z, and the first direction X being perpendicular to each other.

[0103] The first battery cell 11a and the second battery cell 11b can be the same battery cell 11. The first battery cell 11a and the second battery cell 11b correspond to the first sampling component 20 and the second sampling component 30, respectively, so that the information of the first battery cell 11a can be collected by the first sampling component 20 and the information of the second battery cell 11b can be collected by the second sampling component 30.

[0104] When multiple battery cells 11 are stacked along the first direction X, the multiple battery cells 11 are arranged sequentially from the stacking start end. The first battery cell 11a is closer to the stacking start end than the second battery cell 11b. Therefore, the first battery cell 11a is located upstream of the first direction X, and the second battery cell 11b is located downstream of the first direction X.

[0105] For example, please refer to Figure 6 Multiple battery cells 11 are divided into a first battery cell group 10a and a second battery cell group 10b. The first battery cell group 10a and the second battery cell group 10b are arranged along a first direction X. The first battery cell group 10a is closer to the stacking start end than the second battery cell group 10b. Figure 6 The dashed line in the diagram can represent the boundary between the first battery cell group 10a and the second battery cell group 10b. The first battery cell group 10a includes a plurality of first battery cells 11a stacked along a first direction X, and the second battery cell group 10b includes a plurality of second battery cells 11b stacked along the first direction X; alternatively, the first battery cell group 10a includes one first battery cell 11a, and the second battery cell group 10b includes a plurality of second battery cells 11b stacked along the first direction X; or, the first battery cell group 10a includes a plurality of first battery cells 11a stacked along the first direction X, and the second battery cell group 10b includes one second battery cell 11b. In this application, the information collected by the first sampling component 20 on the first battery cell 11a includes, but is not limited to, temperature information and / or voltage information. Similarly, the information collected by the second sampling component 30 on the second battery cell 11b includes, but is not limited to, temperature information and / or voltage information.

[0106] In some embodiments, the first sampling component 20 may be connected to the busbar component 50 corresponding to the first battery cell 11a (see reference). Figure 5 The first sampling component 11a is used to collect information from the second battery cell 11a; the second sampling component 30 can be connected to the busbar 50 corresponding to the second battery cell 11b to collect information from the second battery cell 11b.

[0107] Please refer to Figure 4 and Figure 5The battery cell 11 includes a positive terminal 12 and a negative terminal 13, which are spaced apart along a third direction Y on the same wall of the housing 110. A first sampling component 20 and a second sampling component 30 extend along a first direction X, with the width directions of both components parallel to the third direction Y. The first sampling component 20 and the second sampling component 30 are connected to the busbar component 50 on both sides of the third direction Y, respectively. Therefore, the dimensions of the first sampling component 20 in the third direction Y affect the assembly of the first sampling component 20 with the first battery cell 11a, and the dimensions of the second sampling component 30 in the third direction Y affect the assembly of the second sampling component 30 with the second battery cell 11b.

[0108] In some embodiments, the first sampling component 20 and the second sampling component 30 may be arranged along the first direction X, and the first sampling component 20 and the second sampling component 30 may not overlap along the second direction Z; or, the first sampling component 20 and the second sampling component 30 may be stacked along the second direction Z, and the first sampling terminal of the first sampling component 20 and the second sampling terminal of the second sampling component 30 may not overlap, thereby reducing the risk of interference between the first sampling terminal and the second sampling terminal.

[0109] According to the battery device 100 of this application embodiment, compared to collecting information of multiple battery cells 11 of a battery cell assembly 10 through a single sampling component, in this application, information of a first battery cell 11a is collected by a first sampling component 20, and information of a second battery cell 11b is collected by a second sampling component 30. Along the second direction Z, the first sampling component 20 and the second sampling component 30 at least partially overlap, which can reasonably utilize the space in the second direction Z, reduce the size of the first sampling component 20 and the second sampling component 30 in the third direction Y, reduce the assembly difficulty of the first sampling component 20 and the second sampling component 30, facilitate the assembly of the first sampling component 20 and the second sampling component 30 with the battery cell assembly 10, thereby improving the assembly efficiency of the battery device 100. Simultaneously, the battery cell assembly 10 can have a larger number of battery cells 11 in the first direction X, thereby enabling the battery device 100 to have a higher energy density.

[0110] According to some embodiments of this application, there are multiple first battery cells 11a and multiple second battery cells 11b.

[0111] The number of first battery cells 11a can be equal to the number of second battery cells 11b. Alternatively, the number of first battery cells 11a can be greater than the number of second battery cells 11b, and the number of first battery cells 11a can be less than the number of second battery cells 11b.

[0112] Optionally, the number of first battery cells 11a and the number of second battery cells 11b are equal.

[0113] The number of first battery cells 11a and the number of second battery cells 11b are both multiple, so that the battery device 100 can include a large number of battery cells 11, and the battery device 100 can have a high energy density.

[0114] In the above scheme, multiple first battery cells 11a and multiple second battery cells 11b require a large number of sampling terminals and wires. Information of the first battery cell 11a is collected by the first sampling component 20, and information of the second battery cell 11b is collected by the second sampling component 30. For example, the first sampling component 20 and the second sampling component 30 can be stacked, or the first sampling component 20 and the second sampling component 30 can be arranged along the first direction X to disperse a large number of wires, which facilitates the assembly of the first sampling component 20 with the first battery cell 11a and the second sampling component 30 with the second battery cell 11b, thereby improving the assembly efficiency of the battery device 100.

[0115] Please refer to Figure 5 According to some embodiments of this application, the first sampling component 20 includes a first circuit board 21 and a plurality of first sampling terminals 22, one end of the first sampling terminal 22 is connected to the first circuit board 21 and the other end is connected to the first battery cell 11a; the second sampling component 30 includes a second circuit board 31 and a plurality of second sampling terminals 32, one end of the second sampling terminal 32 is connected to the second circuit board 31 and the other end is connected to the second battery cell 11b; along the second direction Z, the first circuit board 21 and the second circuit board 31 at least partially overlap.

[0116] The first circuit board 21 is used to realize the electrical connection between the first sampling terminal 22 and the monitoring component. The monitoring component may include, but is not limited to, a battery monitoring unit or a battery management system, so as to transmit the information of the battery cell 11 collected by the first sampling terminal 22 to the monitoring component.

[0117] The first sampling terminal 22 is a component used to collect information from the first battery cell 11a. The first sampling terminal 22 can be connected to the first battery cell 11a, or it can be disconnected from the first battery cell 11a. The first sampling terminal 22 may include, but is not limited to, a temperature sensor, a voltage sensor, etc.

[0118] In some embodiments, the first sampling terminal 22 may be electrically connected to the first wire of the first circuit board 21.

[0119] The second circuit board 31 is used to realize the electrical connection between the second sampling terminal 32 and the monitoring component. The monitoring component may include, but is not limited to, a battery monitoring unit or a battery management system, so as to transmit the information of the battery cell 11 collected by the second sampling terminal 32 to the monitoring component.

[0120] The second sampling terminal 32 is a component used to collect information from the second battery cell 11b. The second sampling terminal 32 can be connected to the second battery cell 11b, or it can be disconnected from the second battery cell 11b. The second sampling terminal 32 may include, but is not limited to, a temperature sensor, a voltage sensor, etc.

[0121] In some embodiments, the second sampling terminal 32 may be electrically connected to the second wire of the second circuit board 31.

[0122] In some embodiments, along the second direction Z, a portion of the first circuit board 21 may be disposed between the second circuit board 31 and the second battery cell 11b; or, a portion of the second circuit board 31 may be disposed between the first circuit board 21 and the first battery cell 11a.

[0123] In the above scheme, the first circuit board 21 facilitates the integration of the first wire and multiple first sampling terminals 22, and the second circuit board 31 facilitates the integration of the second wire and multiple second sampling terminals 32. The first circuit board 21 and the second circuit board 31 at least partially overlap, which can utilize the space in the second direction Z, so as to reduce the space occupied by the first circuit board 21 and the second circuit board 31 in the third direction Y, thereby facilitating the improvement of the assembly efficiency of the first sampling component 20 and the first battery cell 11a, the improvement of the assembly efficiency of the second sampling component 30 and the second battery cell 11b, and thus improving the assembly efficiency of the battery device 100.

[0124] Please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram showing the assembly state of the first sampling component and the second sampling component provided in some embodiments of this application. Figure 8 for Figure 7 A schematic diagram of the structure of the first sampling component and the second sampling component is provided. According to some embodiments of this application, each battery cell 11 includes a housing 110, a positive terminal 12 and a negative terminal 13. The housing 110 includes a first wall 111. The positive terminal 12 and the negative terminal 13 are spaced apart on the first wall 111 along a third direction Y. The third direction Y, the second direction Z and the first direction X are perpendicular to each other. Along the third direction Y, the first circuit board and the second circuit board are both located between the positive terminal and the negative terminal.

[0125] like Figure 4As shown, the battery cell 11 also includes an electrode assembly 14, which is housed within the housing 110. The housing 110 may include a casing 112 and an end cap 113. The casing 112 has an opening, and the end cap 113 closes the opening to isolate the internal environment of the battery cell 11 from the external environment.

[0126] The housing 112 is an assembly used to cooperate with the end cap 113 to form the internal environment of the battery cell 11, wherein the formed internal environment can accommodate the electrode assembly 14, electrolyte, and other components. The housing 112 and the end cap 113 can be independent components. The housing 112 can have various shapes and sizes. Specifically, the shape of the housing 112 can be determined according to the specific shape and size of the electrode assembly 14. The housing 112 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0127] End cap 113 refers to a component that covers the opening of housing 112 to isolate the internal environment of battery cell 11 from the external environment. The shape of end cap 113 can be adapted to the shape of housing 112 to fit it. Optionally, end cap 113 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 113 is not easily deformed under pressure and impact, giving battery cell 11 higher structural strength and improved reliability. Functional components such as positive terminal 12 and negative terminal 13 can be provided on end cap 113. Positive terminal 12 and negative terminal 13 can be used for electrical connection with electrode assembly 14 to output or input electrical energy to battery cell 11. The material of end cap 113 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 113. The insulating structure can be used to isolate the electrical connection components within the housing 112 from the end cap 113 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0128] Electrode assembly 14 is the component in the battery cell 11 where the electrochemical reaction occurs. The housing 112 may contain one or more electrode assemblies 14. The electrode assembly 14 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 14, while the portions of the positive and negative electrode sheets without active material each constitute a tab.

[0129] In some embodiments, the first wall 111 may be an end cap 113, or the first wall 111 may be a wall portion of the housing 112.

[0130] Optionally, the first wall 111 is an end cap 113, which is provided with two electrode lead-out holes. The positive terminal 12 and the negative terminal 13 are respectively provided with the two electrode lead-out holes to facilitate the assembly of the positive terminal 12 and the negative terminal 13 with the first wall 111.

[0131] The thickness direction of the first wall 111 can be parallel to the second direction Z.

[0132] In some embodiments, the size of the first circuit board 21 in the third direction Y can be designed to be smaller, and the size of the second circuit board 31 in the third direction Y can be designed to be smaller, so that both the first circuit board 21 and the second circuit board 31 are located between the positive terminal 12 and the negative terminal 13.

[0133] In the above scheme, the first circuit board 21 and the second circuit board 31 are both located between the positive terminal 12 and the negative terminal 13, which can reduce the risk of interference between the first sampling component 20 and the first battery cell 11a, and reduce the risk of interference between the second sampling component 30 and the second battery cell 11b, thereby facilitating the improvement of the assembly efficiency of the battery device 100.

[0134] Please refer to Figure 7 and Figure 8 According to some embodiments of this application, the first circuit board 21 includes a first segment 21a and a second segment 21b. The first segment 21a extends along a first direction X, and a first sampling terminal 22 is disposed on the first segment 21a. One end of the second segment 21b is connected to the first segment 21a. Along a second direction Z, the second circuit board 31 overlaps with the second segment 21b and is connected to the second segment 21b. The first sampling component 20 also includes a first connector 23, which is disposed at the end of the second segment 21b away from the first segment 21a. The second sampling component 30 also includes a second connector 33, which is disposed at the end of the second circuit board 31 away from the first segment 21a.

[0135] The first segment 21a and the second segment 21b are two components of the first circuit board 21. Along the second direction Z, the first segment 21a overlaps at least partially with the first battery cell group 10a, and the second segment 21b overlaps at least partially with the second battery cell group 10b.

[0136] In some embodiments, along the second direction Z, the second segment 21b may be located on the side of the second circuit board 31 facing the battery cell assembly 10, or the second segment 21b may be located on the side of the second circuit board 31 away from the battery cell assembly 10.

[0137] The first connector 23 is used to output the information of the first battery cell 11a collected by the first sampling terminal 22.

[0138] The second connector 33 is used to output the information of the second battery cell 11b collected by the second sampling terminal 32.

[0139] The first connector 23 and the second connector 33 can be located at the same end of the electrode assembly 14 in the first direction X.

[0140] In the above scheme, the first segment 21a, the second segment 21b and the first connector 23 are arranged along the first direction X, the second circuit board 31 overlaps with the second segment 21b, and the first connector 23 and the second connector 33 are disposed at the same end of the battery cell assembly 10, so as to facilitate the connection of the first connector 23 and the second connector 33 with other components (such as battery monitoring unit, battery management system, etc.), which can improve the utilization rate of the internal space of the battery device 100 and facilitate the improvement of the energy density of the battery device 100.

[0141] According to some embodiments of this application, the battery device 100 further includes a separator 60 that divides the interior of the housing 40 into a battery compartment 43 and an electrical compartment 44, with the battery cell assembly 10 located in the battery compartment 43 and the first connector 23 and the second connector 33 located in the electrical compartment 44.

[0142] In some embodiments, the separator 60 may be an expansion beam to resist the expansion deformation of the battery cell assembly 10.

[0143] Please refer to Figure 3 and Figure 7 According to some embodiments of this application, along the third direction Y, the first connector 23 and the second connector 33 at least partially overlap, and the third direction Y, the second direction Z and the first direction X are perpendicular to each other.

[0144] In some embodiments, along the third direction Y, the first connector 23 and the second connector 33 partially overlap, or the first connector 23 and the second connector 33 completely overlap, and the space occupied by the structure formed by the first connector 23 and the second connector 33 in the first direction X can be small.

[0145] In some embodiments, the end of the second segment 21b away from the first segment 21a is bent so that the portion of the second segment 21b located within the electrical compartment 44 is arranged along a third direction Y; the end of the second circuit board 31 away from the first segment 21a is bent so that the portion of the second circuit board 31 located within the electrical compartment 44 is arranged along a third direction Y, so that the first connector 23 and the second connector 33 at least partially overlap along a third direction Y.

[0146] In the above scheme, the first connector 23 and the second connector 33 at least partially overlap along the third direction Y, which can reduce the space occupied by the first connector 23 and the second connector 33 in the first direction X, so as to improve the utilization rate of the internal space of the battery device 100 and improve the energy density of the battery device 100.

[0147] According to some embodiments of this application, the second segment 21b is bonded to the second circuit board 31 by an adhesive layer.

[0148] The second segment 21b is bonded to the second circuit board 31 with an adhesive layer. During the assembly of the battery device 100, an adhesive layer can be applied to the surface of the second segment 21b, and then the second circuit board 31 can be connected to the second segment 21b with the adhesive layer applied; or, an adhesive layer can be applied to the surface of the second circuit board 31, and then the second segment 21b can be connected to the second circuit board 31 with the adhesive layer applied.

[0149] The adhesive layer can be a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer, so that the second segment 21b is firmly connected to the second circuit board 31.

[0150] In the above scheme, the second segment 21b is connected to the second circuit board 31 by an adhesive layer, which is simple to operate and facilitates the improvement of the connection reliability between the second segment 21b and the second circuit board 31.

[0151] According to some embodiments of this application, the first sampling component 20 and the second sampling component 30 are arranged along the first direction X and along the second direction Z, the first sampling component 20 and the second sampling component 30 do not overlap.

[0152] Please refer to Figure 9 , Figure 9 This is a schematic diagram illustrating the assembly state of the battery cell assembly with the first sampling assembly and the second sampling assembly, provided in other embodiments of this application. Figure 9 The dashed line in the diagram can be the boundary line between the first battery cell group 10a and the second battery cell group 10b. According to some embodiments of this application, the first circuit board 21 and the second circuit board 31 are arranged along a first direction X; the first sampling component 20 further includes a first connector 23, which is disposed at the end of the first circuit board 21 away from the second circuit board 31; the second sampling component 30 further includes a second connector 33, which is disposed at the end of the second circuit board 31 away from the first circuit board 21.

[0153] In some embodiments, the first connector 23 of the first sampling component 20 and the second connector 33 of the second sampling component 30 may be located at opposite ends of the battery cell assembly 10 in the first direction X, so that information of the battery cell 11 can be output from both ends in the first direction X.

[0154] In the above scheme, the first circuit board 21 and the second circuit board 31 are arranged along the first direction X, and the first circuit board 21 and the second circuit board 31 do not overlap in the second direction Z, which can reduce the space occupied by the first circuit board 21 and the second circuit board 31 in the second direction Z; the first connector 23 is disposed at the end of the first circuit board 21 away from the second circuit board 31, and the second connector 33 is disposed at the end of the second circuit board 31 away from the first circuit board 21, which can arrange the first connector 23 and the second connector 33 at both ends of the battery cell assembly 10 along the first direction X, which can reduce the risk of interference between the first sampling component 20 and the second sampling component 30, and facilitate the improvement of the assembly efficiency of the battery device 100.

[0155] Please refer to Figures 10 to 13 , Figure 10 This is a schematic diagram of the structure of the first sampling component provided in some embodiments of this application. Figure 11 for Figure 10 A magnified view of part B. Figure 12 This is a schematic diagram of the structure of the second sampling component provided in some embodiments of this application. Figure 13 for Figure 12 A partial enlarged view at point C. According to some embodiments of this application, the first circuit board 21 includes a first substrate 211 and a plurality of first wires 212, the plurality of first wires 212 being arranged on the same plane of the first substrate 211 perpendicular to the second direction Z, and the first sampling terminal 22 being electrically connected to the first wires 212; the second circuit board 31 includes a second substrate 311 and a plurality of second wires 312, the plurality of second wires 312 being arranged on the same plane of the second substrate 311 perpendicular to the second direction Z, and the second sampling terminal 32 being electrically connected to the second wires 312.

[0156] The first substrate 211 can be a flexible board, for example, the material of the first substrate 211 can be a polyimide copper-clad laminate.

[0157] The first wire 212 is integrated into the first substrate 211 and is used to transmit electrical signals.

[0158] The first sampling terminal 22 and the first wire 212 can be soldered together.

[0159] In some embodiments, the first conductor 212 may be a copper wire.

[0160] Multiple first wires 212 are arranged on the same plane of the first substrate 211 perpendicular to the second direction Z, such that the multiple first wires 212 are arranged in a single layer in the second direction Z, that is, the multiple first wires 212 can be arranged along the third direction Y.

[0161] The second substrate 311 can be a flexible board, for example, the material of the second substrate 311 can be a polyimide copper-clad laminate.

[0162] The second wire 312 is integrated into the second substrate 311 and is used to transmit electrical signals.

[0163] The second sampling terminal 32 and the second wire 312 can be soldered together.

[0164] In some embodiments, the second conductor 312 may be a copper wire.

[0165] Multiple second wires 312 are arranged on the same plane of the second substrate 311 perpendicular to the second direction Z, such that the multiple second wires 312 are arranged in a single layer in the second direction Z, that is, the multiple second wires 312 can be arranged along the third direction Y.

[0166] In the above scheme, multiple first wires 212 are arranged on the same plane of the first substrate 211 perpendicular to the second direction Z, and multiple second wires 312 are arranged on the same plane of the second substrate 311 perpendicular to the second direction Z. This makes the space occupied by the first circuit board 21 in the second direction Z smaller, and the space occupied by the second circuit board 31 in the second direction Z smaller, which can reduce the space occupied by the first sampling component 20 and the second sampling component 30 in the second direction Z, and is beneficial to improving the energy density of the battery device 100.

[0167] According to some embodiments of this application, both the first circuit board 21 and the second circuit board 31 are flexible circuit boards.

[0168] Flexible circuit boards are characterized by their flexibility, thinness, high reliability, and good heat dissipation.

[0169] According to some embodiments of this application, the surface of the battery cell 11 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 11.

[0170] The surface with the largest area of ​​the battery cell 11 can be called the large surface of the battery cell 11. The large surface of the battery cell 11 is perpendicular to the first direction X, and the thickness direction of the battery cell 11 can be parallel to the first direction X.

[0171] In the above scheme, the surface of the battery cell 11 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 11, which makes it easier to set more battery cells 11 and improve the energy density of the battery device 100.

[0172] According to some embodiments of this application, the number of battery cells 11 in the battery cell assembly 10 is M, satisfying that M≥25.

[0173] When the number of battery cells 11 in the battery cell assembly 10 is M≥25, the number of battery cells 11 is relatively large, and a large number of sampling terminals are required. Therefore, the sampling assembly needs to be equipped with a large number of wires.

[0174] In the above scheme, the information of the first battery cell 11a and the second battery cell 11b are collected through the first sampling component 20 and the second sampling component 30. The number of battery cells 11 in the battery cell assembly 10 can be designed to be large. For example, the number of battery cells 11 in the battery cell assembly 10 is M≥25, so that the battery device 100 can have a high energy density.

[0175] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 provided according to any of the above embodiments, the battery device 100 being used to provide electrical energy to the electrical device.

[0176] The power supply device can be any of the above-mentioned systems or devices that use the battery device 100 as a power source.

[0177] According to some embodiments of this application, this application also provides an energy storage device, which includes a battery device 100 provided according to any of the above embodiments, the battery device 100 being used to store electrical energy and capable of providing electrical energy.

[0178] Energy storage devices may include, but are not limited to, energy storage containers and energy storage cabinets.

[0179] According to some embodiments of this application, please refer to Figures 3 to 13 This application provides a battery device 100, which includes a housing 40, a battery cell assembly 10, a first sampling assembly 20 and a second sampling assembly 30.

[0180] The battery cell assembly 10, the first sampling assembly 20 and the second sampling assembly 30 are all located inside the housing 40.

[0181] The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X. Each battery cell 11 includes a housing 110, a positive terminal 12, and a negative terminal 13. The housing 110 includes a first wall 111. The positive terminal 12 and the negative terminal 13 are spaced apart along a third direction Y on the first wall 111. The plurality of battery cells 11 includes a plurality of first battery cells 11a and a plurality of second battery cells 11b. The plurality of first battery cells 11a are stacked along the first direction X to form a first battery cell group 10a, and the plurality of second battery cells 11b are stacked along the first direction X to form a second battery cell group 10b. The first battery cell group 10a and the second battery cell group 10b are arranged along the first direction X, with the first battery cell group 10a located upstream of the first direction X and the second battery cell assembly 10b located downstream of the first direction X.

[0182] The first sampling component 20 is at least partially disposed between the positive terminal 12 and the negative terminal 13, and is used to collect information of the first battery cell 11a in the battery cell assembly 10; the second sampling component 30 is at least partially disposed between the positive terminal 12 and the negative terminal 13, and is used to collect information of the second battery cell 11b in the battery cell assembly 10.

[0183] The first sampling component 20 includes a first circuit board 21, a plurality of first sampling terminals 22, and a first connector 23. The first circuit board 21 includes a first substrate 211 and a plurality of first wires 212. The plurality of first wires 212 are arranged on the same plane of the first substrate 211 perpendicular to the second direction Z. The first sampling terminals 22 are electrically connected to the first wires 212. The first circuit board 21 includes a first segment 21a and a second segment 21b. The first segment 21a extends along the first direction X. The first sampling terminals 22 are disposed on the first segment 21a. One end of the second segment 21b is connected to the first segment 21a. The first connector 23 is disposed on the end of the second segment 21b away from the first segment 21a.

[0184] The second sampling assembly 30 includes a second circuit board 31, a plurality of second sampling terminals 32, and a second connector 33. The second circuit board 31 includes a second substrate 311 and a plurality of second wires 312. The plurality of second wires 312 are arranged on the same plane of the second substrate 311 perpendicular to the second direction Z. The second sampling terminals 32 are electrically connected to the second wires 312. The second connector 33 is disposed at the end of the second circuit board 31 away from the first segment 21a. Along the second direction Z, the second circuit board 31 overlaps with the second segment 21b and is bonded to the second segment 21b. Along the third direction Y, both the first circuit board 21 and the second circuit board 31 are located between the positive terminal 12 and the negative terminal 13.

[0185] According to the battery device 100 of this application embodiment, the first circuit board 21 facilitates the integration of the first wire 212 and a plurality of first sampling terminals 22, and the second circuit board 31 facilitates the integration of the second wire 312 and a plurality of second sampling terminals 32. Both the first circuit board 21 and the second circuit board 31 are located between the positive terminal 12 and the negative terminal 13, which can reduce the risk of interference between the first sampling component 20 and the first battery cell 11a, and reduce the risk of interference between the second sampling component 30 and the second battery cell 11b, thus improving the assembly efficiency of the battery device 100. The plurality of first wires 212 are arranged on the same plane of the first substrate 211 perpendicular to the second direction Z, and the plurality of second wires 312 are arranged on the same plane of the second substrate 311 perpendicular to the second direction Z. This results in a smaller space occupation of the first circuit board 21 and the second circuit board 31 in the second direction Z, reducing the space occupation of the first sampling component 20 and the second sampling component 30 in the second direction Z, which is beneficial to improving the energy density of the battery device 100. The first connector 23 and the second connector 33 are located at the same end of the battery cell assembly 10 to facilitate the connection of the first connector 23 and the second connector 33 with other components (such as the battery monitoring unit, the battery management system, etc.), thereby improving the utilization rate of the internal space of the battery device 100 and facilitating the improvement of the energy density of the battery device 100.

[0186] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a plurality of battery cells stacked along a first direction, wherein a portion of the battery cells located upstream in the first direction are first battery cells, and the remaining battery cells located downstream in the first direction are second battery cells. The first sampling component is electrically connected to the first battery cell and is used to collect information from the first battery cell. The second sampling component is connected to the first sampling component and electrically connected to the second battery cell, and is used to collect information of the second battery cell in the battery cell assembly; Along the second direction, the first sampling component and the second sampling component at least partially overlap, and the second direction is perpendicular to the first direction.

2. The battery device according to claim 1, characterized in that, The number of the first battery cell is multiple, and the number of the second battery cell is multiple.

3. The battery device according to claim 1, characterized in that, The first sampling component includes a first circuit board and a plurality of first sampling terminals, one end of the first sampling terminal being connected to the first circuit board and the other end being connected to the first battery cell; The second sampling component includes a second circuit board and a plurality of second sampling terminals, one end of the second sampling terminal being connected to the second circuit board and the other end being connected to the second battery cell; Along the second direction, the first circuit board and the second circuit board at least partially overlap.

4. The battery device according to claim 3, characterized in that, Each of the battery cells includes a casing, a positive terminal and a negative terminal. The casing includes a first wall. The positive terminal and the negative terminal are spaced apart on the first wall along a third direction. The third direction, the second direction and the first direction are perpendicular to each other. Along the third direction, both the first circuit board and the second circuit board are located between the positive terminal and the negative terminal.

5. The battery device according to claim 3, characterized in that, The first circuit board includes a first segment and a second segment, the first segment extends along the first direction, the first sampling terminal is disposed in the first segment, and one end of the second segment is connected to the first segment; Along the second direction, the second circuit board overlaps with the second segment, and the second circuit board is connected to the second segment; The first sampling component further includes a first connector, which is disposed at the end of the second segment away from the first segment; The second sampling component further includes a second connector, which is disposed at the end of the second circuit board away from the first segment.

6. The battery device according to claim 5, characterized in that, Along a third direction, the first connector and the second connector at least partially overlap, and the third direction, the second direction, and the first direction are perpendicular to each other.

7. The battery device according to claim 5, characterized in that, The second segment is bonded to the second circuit board with an adhesive layer.

8. The battery device according to claim 3, characterized in that, The first circuit board and the second circuit board are arranged along the first direction; The first sampling component further includes a first connector, which is disposed at the end of the first circuit board away from the second circuit board; The second sampling component further includes a second connector disposed at the end of the second circuit board away from the first circuit board.

9. The battery device according to claim 3, characterized in that, The first circuit board includes a first substrate and a plurality of first wires, the plurality of first wires being arranged on the same plane of the first substrate perpendicular to the second direction, and the first sampling terminal being electrically connected to the first wires; The second circuit board includes a second substrate and a plurality of second wires, the plurality of second wires being arranged on the same plane of the second substrate perpendicular to the second direction, and the second sampling terminal being electrically connected to the second wires.

10. The battery device according to claim 1, characterized in that, The surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

11. The battery device according to any one of claims 1-10, characterized in that, The number of battery cells in the battery cell assembly is M, satisfying that M≥25.

12. An electrical appliance, characterized in that, The battery device includes any one of claims 1-11, wherein the battery device is used to provide electrical energy to the electrical device.

13. An energy storage device, characterized in that, Includes a battery device as described in any one of claims 1-11, the battery device being used to store electrical energy and capable of providing electrical energy.

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