Battery device and electric device

Abstract

The application is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises: a battery monomer assembly, the battery monomer assembly comprises at least two battery monomers arranged along a first direction, the battery monomer comprises two electrode terminals arranged along a second direction at an angle with the first direction; and a sampling structure, the sampling structure comprises a sampling piece, the sampling piece comprises at least two sampling parts, the sampling part is used for collecting state information of the battery monomer, the at least two sampling parts are arranged along the second direction at intervals, so that at least one electrode terminal is located between the adjacent two sampling parts. In the battery device provided by the application, the volume of the sampling structure can be increased, so that the sampling structure can collect the state information of each battery monomer; meanwhile, the gap between the electrode terminal and the box can be better utilized, the internal space of the box does not need to be increased, so that the negative influence on the energy density of the battery device can be reduced.

Description

Technical Field

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

[0002] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0003] In current battery devices, when the number of individual battery cells is large, the number of connection structures between the sampling structure and the individual battery cells also needs to be increased accordingly. The space occupied by the sampling structure will also increase, which can easily lead to a decrease in the energy density of the battery device. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device that can increase the number of connection structures between the sampling structure and the battery cell, and reduce the negative impact on the energy of the battery device.

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

[0006] The enclosure includes a housing with a cavity; a battery cell assembly housed within the cavity, the battery cell assembly including at least two battery cells arranged along a first direction, each battery cell including two electrode terminals spaced apart along a second direction, the second direction being at an angle to the first direction; and a sampling structure housed within the cavity, the sampling structure including a sampling element, the sampling element including at least two sampling sections, the sampling sections being used to collect state information of the battery cells, the at least two sampling sections being spaced apart along the second direction such that at least one electrode terminal is located between two adjacent sampling sections.

[0007] In this embodiment, the sampling structure includes at least two sampling units, so that both sampling units can collect the state information of individual battery cells. When there are many individual battery cells, this arrangement can increase the volume of the sampling structure, thereby facilitating the collection of state information of each individual battery cell. The sampling units are arranged alternately with the electrode terminals, so that each sampling unit can be located on different sides of the electrode terminals. This arrangement can better utilize the gap between the electrode terminals and the housing, which can increase the volume of the sampling structure without increasing the internal space of the housing, thereby reducing the negative impact on the energy density of the battery device.

[0008] In some embodiments, there are two sampling units, which are located on opposite sides of any electrode terminal along the second direction.

[0009] The technical solution of this embodiment provides a specific structure for some sampling components, which includes two sampling parts and the two sampling parts are located on opposite sides of the electrode terminals, making better use of the space between the two electrode terminals and the space between the electrode terminals and the housing. This can not only increase the volume of the sampling structure to meet the requirements of the sampling structure to collect the state information of each battery cell, but also reduce the negative impact of the sampling structure on the energy density of the battery device.

[0010] In some embodiments, there are two sampling units, which are located on opposite sides of two electrode terminals along a second direction.

[0011] The technical solution of this embodiment provides a specific structure for some sampling components, which includes two sampling parts and the two sampling parts are located on opposite sides of the two electrode terminals. This makes better use of the space between the electrode terminals and the housing, which can increase the volume of the sampling structure to meet the requirements of the sampling structure to collect the state information of each battery cell, and also reduce the negative impact of the sampling structure on the energy density of the battery device.

[0012] In some embodiments, the number of sampling units is three, and the three sampling units and two electrode terminals are arranged alternately along the second direction.

[0013] The technical solution of this embodiment provides a specific structure for some sampling components, which includes three sampling parts. The three sampling parts can be located between the two electrode terminals and on the outside of the two electrode terminals, respectively. This makes fuller use of the space between the two electrode terminals and the space between the electrode terminals and the housing. This can increase the volume of the sampling structure to meet the requirements of the sampling structure to collect the state information of each battery cell, and also reduce the negative impact of the sampling structure on the energy density of the battery device.

[0014] In some embodiments, the battery cell further includes a housing, and electrode terminals are disposed on the housing; the battery device further includes an electrical connection structure disposed on the side of the electrode terminals away from the housing, and the electrical connection structure is electrically connected to the electrode terminals of different battery cells; at least a portion of the sampling unit is located between the electrical connection structure and the housing.

[0015] In this embodiment, the sampling unit is located between the electrical connection structure and the outer casing, utilizing the space below the electrical connection structure, thereby better reducing the negative impact of the sampling structure on the energy density of the battery device.

[0016] In some embodiments, the sampling element further includes a connecting portion, and each sampling element is connected to the connecting portion.

[0017] In the technical solution of this embodiment, a connecting part is provided and connected to each sampling part, so that each sampling part can be connected to the connected control device or other electrical structure through the connecting part. This reduces the connection structure between each sampling part and the connected control device or other electrical structure, further reduces the space occupation of the sampling structure, and further reduces the negative impact of the sampling structure on the energy density of the battery device.

[0018] In some embodiments, a first buffer structure is provided between the connecting portion and the adjacent battery cell.

[0019] In the technical solution of this embodiment, a first buffer structure is provided between the connecting part and the adjacent battery cell to reduce direct friction and collision between the connecting part and the battery cell, thereby reducing the risk of friction damage and collision damage to the connecting part.

[0020] In some embodiments, a second buffer structure is provided between the connecting part and the inner surface of the housing.

[0021] In the technical solution of this embodiment, a second buffer structure is provided between the connecting part and the inner surface of the box to reduce direct friction and collision between the connecting part and the box, thereby reducing the risk of friction damage and collision damage to the connecting part.

[0022] In some embodiments, the sampling structure includes at least two sampling elements.

[0023] In the technical solution of this embodiment, the sampling structure includes at least two sampling elements, which increases the volume of the sampling structure and allows the sampling structure to have more positions to connect with each battery cell, so that the sampling structure can collect the state information of each battery cell.

[0024] In some embodiments, at least a portion of each sampling element is stacked along a third direction, which is perpendicular to the first and second directions.

[0025] In the technical solution of this embodiment, each sampling component is stacked along a third direction. This arrangement utilizes the space formed by the height of the electrode terminals, which can increase the volume of the sampling structure without increasing the internal space of the box, thus making better use of the internal space of the box.

[0026] In some embodiments, the sampling member further includes a connecting portion, and the sampling portion of each sampling member is connected to the connecting portion; the connecting portions of different sampling members are all located on the same side of the sampling portion connected to them along the first direction, and a third buffer structure is provided between two adjacent connecting portions.

[0027] In the technical solution of this embodiment, when the sampling structure includes at least two sampling components, a third buffer structure is provided between the connecting parts of different sampling components to reduce direct friction and collision between adjacent connecting parts, thereby reducing the risk of friction damage and collision damage to the connecting parts.

[0028] In some embodiments, the sampling structure includes at least a first sampling element and a second sampling element, which are alternately arranged along a second direction; the first sampling element includes at least a first sampling portion and a second sampling portion, with the first sampling portion located between two electrode terminals; the second sampling element includes at least a third sampling portion and a fourth sampling portion, with the third sampling portion located between two electrode terminals.

[0029] The technical solution of this embodiment provides some arrangement of sampling components, so that the sampling structure includes a first sampling component and a second sampling component, and the first sampling component and the second sampling component are arranged alternately to better utilize the space between the electrode terminals and the space between the electrode terminals and the housing. This can increase the volume of the sampling structure without increasing the internal space of the housing, and make better use of the internal space of the housing.

[0030] In some embodiments, the first sampling section and the third sampling section are arranged along the second direction.

[0031] The technical solution of this embodiment further provides some arrangement methods of the first sampling component and the second sampling component, so that the first sampling part and the third sampling part are arranged side by side, so as to increase the volume of the sampling structure and make better use of the space inside the box.

[0032] In some embodiments, the first sampling unit and the third sampling unit are stacked along a third direction, which is perpendicular to the first direction and the second direction.

[0033] The technical solution of this embodiment further provides some arrangement methods for the first and second sampling components, so that the first sampling part and the third sampling part are stacked, which better increases the volume of the sampling structure and makes better use of the space inside the box.

[0034] In some embodiments, the first sampling member includes two first sampling sections and a second sampling section, with the two first sampling sections located on both sides of the second sampling section along a second direction; and / or, the second sampling member includes two third sampling sections and a fourth sampling section, with the two third sampling sections located on both sides of the fourth sampling section along a second direction.

[0035] The technical solution of this embodiment further provides the structure of some first sampling parts and second sampling parts, so that the first sampling part and the third sampling part are located between two electrode terminals, and the second sampling part and the fourth sampling part are located outside the electrode terminals. This can increase the volume of the sampling structure without increasing the internal space of the box, thus making better use of the internal space of the box.

[0036] In some embodiments, the battery device includes at least two battery cell assemblies arranged along a second direction; in the second direction, a second sampling portion and / or a fourth sampling portion are located between two adjacent electrode terminals of different battery cell assemblies.

[0037] In this embodiment, the battery device includes at least two battery cell assemblies. The first sampling unit and the third sampling unit are located between two electrode terminals of the same battery cell, and the second sampling unit and the fourth sampling unit are located between adjacent electrode terminals of different battery cells. This makes fuller use of the internal space of the housing and also increases the volume of the sampling structure.

[0038] In some embodiments, in the second direction, the ratio between the size of the electrode terminal and the size of the battery cell is 0.15 to 0.25.

[0039] The technical solution of this embodiment provides some dimensional relationships between electrode terminals and battery cells. The electrode terminals occupy a large space of the battery cell in the second direction, resulting in a small installation space for the sampling structure. Accordingly, the sampling component includes at least two sampling parts to make full use of the gap between the two electrode terminals and the gap between the electrode terminals and the housing. This can not only increase the volume of the sampling structure, but also reduce the negative impact on the energy density of the battery device.

[0040] In some embodiments, in the second direction, the size of the battery cell is less than or equal to 150 mm.

[0041] The technical solution of this embodiment provides the dimensions of some battery cells in the second direction. The smaller dimensions of the battery cells in the second direction result in a smaller installation space for the sampling structure. Accordingly, the sampling component includes at least two sampling parts to make full use of the gap between the two electrode terminals and the gap between the electrode terminals and the housing. This can both increase the volume of the sampling structure and reduce the negative impact on the energy density of the battery device.

[0042] In some embodiments, in the second direction, the size of the battery cell is less than or equal to 120 mm.

[0043] The technical solution of this embodiment further provides some dimensions of the battery cells in the second direction. The smaller dimensions of the battery cells in the second direction result in a smaller installation space for the sampling structure. Accordingly, the sampling component includes at least two sampling parts to make full use of the gap between the two electrode terminals and the gap between the electrode terminals and the housing. This can both increase the volume of the sampling structure and reduce the negative impact on the energy density of the battery device.

[0044] In some embodiments, in the first direction, the ratio of the size of the receiving cavity to the size of the battery cell is greater than or equal to 25.

[0045] The technical solution of this embodiment provides a dimensional relationship between the cavities and individual battery cells in the first direction. The size of a single battery cell is smaller than the size of the cavity, meaning that the cavity contains a large number of battery cells. Consequently, the sampling structure needs to have a large number of sampling locations. Therefore, the sampling component includes at least two sampling locations to increase the volume of the sampling structure, thereby enabling the sampling structure to have sufficient sampling locations and to collect the state information of each battery cell.

[0046] Secondly, embodiments of this application also provide an electrical device, including the battery device provided in some embodiments of the first aspect.

[0047] 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

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0050] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0051] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0052] Figure 4 A three-dimensional schematic diagram of the sampling structure provided in some embodiments of this application;

[0053] Figure 5 A partially enlarged schematic diagram of the sampling structure provided in some embodiments of this application mounted on a battery cell assembly. Figure 1 ;

[0054] Figure 6 A partially enlarged schematic diagram of the sampling structure provided in some embodiments of this application mounted on a battery cell assembly. Figure 2 ;

[0055] Figure 7 A cross-sectional schematic diagram of a sampling structure installed on a battery cell assembly, as provided in some embodiments of this application;

[0056] Figure 8 This is a three-dimensional schematic diagram of the sampling structure provided in some other embodiments of this application;

[0057] Figure 9 A partially enlarged schematic diagram of the sampling structure installed on a battery cell assembly, as provided in other embodiments of this application. Figure 1 ;

[0058] Figure 10 A partially enlarged schematic diagram of the sampling structure installed on a battery cell assembly, as provided in other embodiments of this application. Figure 2 ;

[0059] Figure 11 A cross-sectional schematic diagram of a sampling structure installed on a battery cell assembly, as provided in other embodiments of this application;

[0060] Figure 12 A top view of the sampling structure installed on a battery cell assembly according to some embodiments of this application. Figure 1 ;

[0061] Figure 13 A top view of the sampling structure installed on a battery cell assembly according to some embodiments of this application. Figure 2 ;

[0062] Figure 14 A top view of the sampling structure installed on a battery cell assembly according to some embodiments of this application. Figure 3 .

[0063] The markings in the diagram mean:

[0064] 1000, vehicles;

[0065] 100. Battery device;

[0066] 10. Box body; 11. First box body; 12. Second box body; 13. Receiving cavity;

[0067] 20. Battery cell assembly; 21. Battery cell; 211. Casing; 2111. End cap; 2112. Housing; 212. Electrode assembly; 213. Electrode terminal;

[0068] 30. Sampling structure; 31. Sampling component; 31a. First sampling component; 31b. Second sampling component; 311. Sampling section; 311a. First sampling section; 311b. Second sampling section; 311c. Third sampling section; 311d. Fourth sampling section; 312. Connecting part; 313. Connector;

[0069] 40. Electrical connection structure;

[0070] 200. Motor;

[0071] 300. Controller. Detailed Implementation

[0072] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0074] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0075] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0076] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0077] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0078] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0079] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0080] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0081] In a battery device, a sampling structure is used to collect the state information of each battery cell, such as voltage and temperature, so that the controller in the battery device can control the working state of the battery device.

[0082] In current battery devices, the sampling structure is typically positioned between the two electrode terminals of the same battery cell. When the size of a single battery cell is large, the distance between the two electrode terminals is also large, and the space between the two electrode terminals is also large, thus providing a large space for accommodating and installing the sampling structure; correspondingly, the sampling structure can also have a large volume, so that it can be electrically connected to each battery cell and collect status information.

[0083] However, some battery devices currently exist with smaller individual cell sizes, smaller spacing between the two electrode terminals, and smaller space between the electrode terminals, resulting in less space available for the sampling structure to accommodate and install. Furthermore, the smaller size of individual cells within a single enclosure leads to a larger number of cells, necessitating a larger sampling structure to accommodate more connection points or structures for electrical connection to each cell and to meet the requirements for collecting state information from each cell.

[0084] In summary, for battery devices with small individual cell sizes, the number of cells in the device is relatively large. Currently, placing the sampling structure between the two electrode terminals of the same cell tends to result in a small sampling structure volume, making it difficult to connect the sampling structure to each cell. Increasing the volume of the sampling structure, on the other hand, would cause it to extend beyond the electrode terminals in height, requiring a corresponding increase in the housing volume, which would also lead to a decrease in the energy density of the battery device.

[0085] Based on the above considerations, in order to alleviate the problem that the current sampling structure is difficult to adapt to the working conditions of small battery cells, and in order to alleviate the negative impact of the increase in the volume of the sampling structure on the energy density of the battery device, this application provides a battery device in which the sampling structure includes a sampling element, and the sampling element includes at least two sampling parts, such that each sampling part is arranged at intervals with the electrode terminals, that is, multiple sampling parts are located on both sides of the electrode terminals.

[0086] In such a battery device, the sampling element includes at least two sampling sections, increasing the volume of the sampling structure and allowing it to have more parts for connection to individual battery cells. At the same time, the sampling sections are arranged alternately with the electrode terminals, meaning that each sampling section can be located on both sides of the electrode terminal to fully utilize the space formed by the electrode terminals protruding from the battery cell's casing. This arrangement can both increase the volume of the sampling structure and reduce the negative impact on the energy density of the battery device.

[0087] The battery device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use battery devices as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0088] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0089] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0091] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include a plurality of battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0092] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0093] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0094] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed in the housing 10.

[0095] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0096] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0097] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0098] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to house the battery cell assembly 20.

[0099] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0100] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application. A battery cell 21 refers to the smallest unit that makes up a battery. The battery cell 21 can be a rechargeable battery, meaning that after the battery cell 21 has been discharged, its active materials can be activated by charging and it can continue to be used.

[0101] The battery cell 21 can be a 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., and the embodiments of this application are not limited to this.

[0102] As shown in the figure, the battery cell 21 includes a housing 211, an electrode assembly 212, and other functional components. The housing 211 includes a shell 2112 and an end cap 2111.

[0103] End cap 2111 refers to a component that covers the opening of housing 2112 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2111 can be adapted to the shape of housing 2112 to fit it. Optionally, end cap 2111 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 2111 is not easily deformed under pressure or impact, giving battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 213 can be provided on end cap 2111. Electrode terminals 213 can be used for electrical connection with electrode assembly 212 for outputting or inputting electrical energy from battery cell 21. In some embodiments, end cap 2111 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The end cap 2111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 2111. The insulating member can be used to isolate the electrical connection part 312 in the housing 2112 from the end cap 2111 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0104] The housing 2112 is a component used to cooperate with the end cap 2111 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 2112 and the end cap 2111 can be independent components. An opening can be provided on the housing 2112, and the end cap 2111 closes the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 2111 and the housing 2112 can be integrated. Specifically, the end cap 2111 and the housing 2112 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 2112, the end cap 2111 closes the housing 2112. The housing 2112 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 2112 can be determined according to the specific shape and size of the electrode assembly 212. The shell 2112 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0105] Electrode assembly 212 is the component in the battery cell 21 where electrochemical reactions occur. The casing 2112 may contain one or more electrode assemblies 212. The electrode assembly 212 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 212, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 213 to form a current loop.

[0106] Firstly, reference Figure 2 , Figure 4 , Figure 5 , Figure 8 , Figure 9 This application provides a battery device 100, including a housing 10, a battery cell assembly 20, and a sampling structure 30. The housing 10 has a receiving cavity 13, in which the battery cell assembly 20 and the sampling structure 30 are both housed. The battery cell assembly 20 includes at least two battery cells 21 arranged along a first direction, and each battery cell 21 includes two electrode terminals 213 arranged at intervals along a second direction, the second direction forming an angle with the first direction. The sampling structure 30 includes a sampling element 31, which includes at least two sampling sections 311 for collecting state information of the battery cells 21. The at least two sampling sections 311 are arranged at intervals along the second direction, such that at least one electrode terminal 213 is located between two adjacent sampling sections 311.

[0107] In the figure, the X-axis is the length direction of the battery device 100 and the thickness direction of the battery cell 21; the Y-axis is the width direction of the battery device 100 and the width direction of the battery cell 21; and the Z-axis is the height direction of the battery device 100 and the height direction of the battery cell 21.

[0108] The housing 10 refers to the structure in the battery device 100 that provides a space for housing the battery cell 21. Both the battery cell 21 and the sampling structure 30 are housed in the housing 10. The housing 10 can be a prism-shaped, cylindrical, or other shaped structure.

[0109] The receiving cavity 13 refers to the spatial structure formed within the housing 10. The receiving cavity 13 is used to accommodate the battery cell assembly 20, the sampling structure 30, or other structures of the battery device 100. Depending on the structure of the housing 10, the receiving cavity 13 can be formed by the interlocking of the first housing 11 and the second housing 12. Alternatively, the receiving cavity 13 can be a spatial structure opened within the housing 10. Depending on the shape of the housing 10, the receiving cavity 13 can be a prism-shaped space, a cylindrical space, or a spatial structure of other shapes.

[0110] A battery cell 21 refers to the smallest unit that makes up the battery device 100. A battery cell 21 can be a cylindrical structure, a prismatic structure, a sheet structure, or other shapes. A battery cell assembly 20 includes at least two battery cells 21, that is, the number of battery cells 21 can be two, three or more, and at least two battery cells 21 are connected in series, parallel or mixed through a busbar component.

[0111] At least two battery cells 21 are arranged along a first direction to form a battery cell assembly 20. The first direction can be the length direction X of the battery device 100, the width direction Y of the battery device 100, or other directions.

[0112] Electrode terminal 213 refers to the structure in battery cell 21 used for inputting and outputting electrical energy. There are two electrode terminals 213, which serve as the positive terminal and negative terminal of battery cell 21, respectively. The two electrode terminals 213 are arranged at intervals along a second direction, which can be the length direction X of battery device 100, the width direction Y of battery device 100, or other directions.

[0113] The second direction is set at an angle to the first direction. The second direction can be perpendicular to the first direction or set at other angles to the first direction. For example, the first direction is the length direction X of the battery device 100, and the second direction is the width direction Y of the battery device 100.

[0114] The sampling structure 30 refers to the structure in the battery device 100 used to collect state information of the battery cell 21 or other structures. When the sampling structure 30 collects the state information of the battery cell 21, the sampling structure 30 can collect the voltage, temperature or other state information of the battery cell 21. The sampling structure 30 can also send the collected state information to the control device in the battery device 100.

[0115] Sampling element 31 refers to a substructure of the sampling structure 30 used to collect state information of battery cell 21 or other structures. A sampling structure 30 may include only one sampling element 31, or it may include two or more sampling elements 31. When the sampling structure 30 includes two or more sampling elements 31, each sampling element 31 can be connected to the corresponding control device. Each sampling element 31 can also be aggregated into an intermediate structure and connected to the control device through the intermediate structure.

[0116] The sampling unit 311 refers to the structure in the sampling component 31 used to collect and transmit status information. The sampling unit 311 may include a wire harness, a flexible printed circuit (FPC), or other structures capable of collecting and transmitting status information. The status information transmitted by the sampling unit 311 may be an electrical signal or other signals. The sampling unit 311 may be directly connected to the electrode terminal 213 or other parts of the battery cell 21, or it may be indirectly connected to the electrode terminal 213 or other parts of the battery cell 21 through an intermediate structure to collect the status information of the battery cell 21. The sampling unit 311 may be a square sheet structure, a cylindrical strip structure, or other shaped structural components.

[0117] The length direction of the sampling unit 311 can be parallel to the first direction, that is, parallel to the arrangement direction of each battery cell 21, so that the sampling unit 311 can also collect the state information of each battery cell 21.

[0118] A sampling device 31 includes at least two sampling sections 311, that is, a sampling device 31 may include only two sampling sections 311, or it may include three or more sampling sections 311. At least two sampling sections 311 are arranged at intervals along a second direction, such that there is an electrode terminal 213 between the two sampling sections 311, that is, the sampling sections 311 are located on both sides of the electrode terminal 213 along the second direction.

[0119] Depending on the number of sampling units 311, if there are two sampling units 311, only one electrode terminal 213 can be provided between the two sampling units 311. In this case, the two sampling units 311 are on both sides of the same electrode terminal 213 along the second direction, with one sampling unit 311 located between the two electrode terminals 213. If there are two sampling units 311, two electrode terminals 213 can also be provided between the two sampling units 311. In this case, the two sampling units 311 are respectively located on the outside of the two electrode terminals 213, and no sampling unit 311 is provided between the two electrode terminals 213. If there are three sampling units 311, the three sampling units 311 can be arranged alternately with the two electrode terminals 213 along the second direction. That is, one of the three sampling units 311 is located between the two electrode terminals 213, and the other two sampling units 311 are respectively located on the outside of the two electrode terminals 213. It can be understood that if there are three or more sampling units 311, two or more sampling units 311 can be provided on the same side of the same electrode terminal 213.

[0120] The sampling unit 311 can be connected to the outer casing 211 of the battery cell 21, or to the housing 10 or other structures. The sampling unit 311 can be directly connected to the outer casing 211, the housing 10 or other structures, or indirectly connected to the corresponding structures through intermediate structures.

[0121] Regardless of whether the sampling unit 311 is a wire harness, a flexible printed circuit (FPC), or other structures, the thickness of the sampling unit 311 is small and less than the height of the electrode terminals 213 above the housing 211. Therefore, this arrangement allows the sampling unit 311 to be installed in the space between each electrode terminal 213, making full use of the space between the electrode terminals 213. It also increases the volume of the sampling unit 31, so that the sampling unit 31 has sufficient space to connect with each battery cell 21. At the same time, it can reduce the negative impact of the increased volume of the sampling unit 31 on the energy density of the battery device 100.

[0122] In this embodiment, the sampling element 31 of the sampling structure 30 includes at least two sampling sections 311, so that both sampling sections 311 can collect the state information of the battery cell 21. When the number of battery cells 21 is large, this arrangement can increase the volume of the sampling structure 30, thereby facilitating the sampling structure 30 to collect the state information of each battery cell 21. The sampling sections 311 are arranged at intervals with the electrode terminals 213, so that each sampling section 311 can be located on different sides of the electrode terminals 213. This arrangement can better utilize the gap between the electrode terminals 213 and the housing 10, which can increase the volume of the sampling structure 30 without increasing the internal space of the housing 10, thereby reducing the negative impact on the energy density of the battery device 100.

[0123] refer to Figures 4 to 7 In some embodiments, there are two sampling units 311, and the two sampling units 311 are located on both sides of any electrode terminal 213 along the second direction.

[0124] There are two sampling units 311, and the two sampling units 311 are respectively located on both sides of any electrode terminal 213 along the second direction. Since the two electrode terminals 213 are arranged along the second direction, one of the two sampling units 311 is located between the two electrode terminals 213 of the corresponding battery cell 21, while the other of the two sampling units 311 is located outside the electrode terminal 213 of the corresponding battery cell 21. That is, any electrode terminal 213 of the corresponding battery cell 21 is located between the two sampling units 311.

[0125] In this setup, the two sampling units 311 are located at different positions of the corresponding battery cell 21 to make full use of the space on both sides of the electrode terminal 213 along the second direction.

[0126] This embodiment provides a specific structure for the sampling element 31, which includes two sampling sections 311, and the two sampling sections 311 are located on opposite sides of the electrode terminal 213. This makes better use of the space between the two electrode terminals 213 and the space between the electrode terminal 213 and the housing 10. This not only increases the volume of the sampling structure 30 to meet the requirements of the sampling structure 30 to collect the state information of each battery cell 21, but also reduces the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0127] In some embodiments, there are two sampling units 311, and the two sampling units 311 are respectively located on opposite sides of the two electrode terminals 213 along the second direction.

[0128] There are two sampling units 311, and the two sampling units 311 are respectively located on both sides of the two electrode terminals 213 of the corresponding battery cell 21, which are opposite to each other along the second direction. In the second direction, the side of the two electrode terminals 213 that faces each other points to the space between the two electrode terminals 213, and the side of the two electrode terminals 213 that are opposite to each other points to the space between one electrode terminal 213 and the other electrode terminal 213.

[0129] The two sampling units 311 are located on opposite sides of the two electrode terminals 213 along the second direction, and at this time, the electrode terminals 213 on both sides of the corresponding battery cell 21 are located between the two sampling units 311.

[0130] This embodiment provides a specific structure for the sampling element 31, which includes two sampling sections 311, and the two sampling sections 311 are located on opposite sides of the two electrode terminals 213. This makes better use of the space between the electrode terminals 213 and the housing 10, which can increase the volume of the sampling structure 30 to meet the requirements of the sampling structure 30 to collect the state information of each battery cell 21, and also reduce the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0131] refer to Figures 8 to 10 In some embodiments, the number of sampling units 311 is three, and the three sampling units 311 and the two electrode terminals 213 are arranged alternately along the second direction.

[0132] There are three sampling units 311, and the three sampling units 311 are arranged alternately with the two electrode terminals 213 of the corresponding battery cell 21 along the second direction. That is, in the second direction, the first sampling unit 311, the first electrode terminal 213, the second sampling unit 311, the second electrode terminal 213 and the third sampling unit 311 are arranged in sequence, and an electrode terminal 213 is provided between two adjacent sampling units 311 of the same sampling element 31.

[0133] This embodiment provides a specific structure for the sampling element 31, which includes three sampling sections 311. The three sampling sections 311 can be located between the two electrode terminals 213 and on the outside of the two electrode terminals 213, respectively. This makes fuller use of the space between the two electrode terminals 213 and the space between the electrode terminals 213 and the housing 10. This not only increases the volume of the sampling structure 30 to meet the requirements of the sampling structure 30 to collect the state information of each battery cell 21, but also reduces the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0134] refer to Figure 2 , Figure 7 , Figure 11 In some embodiments, the battery cell 21 further includes a housing 211, and electrode terminals 213 are disposed on the housing 211; the battery device 100 further includes an electrical connection structure 40, which is disposed on the side of the electrode terminals 213 away from the housing 211, and the electrical connection structure 40 is electrically connected to the electrode terminals 213 of different battery cells 21; at least a portion of the sampling unit 311 is located between the electrical connection structure 40 and the housing 211.

[0135] The casing 211 refers to the structure in the battery cell 21 that constitutes the internal environment of the battery cell 21. The electrode assembly 212 is housed in the casing 211. The electrode terminal 213 is provided on the casing 211. A part of the electrode terminal 213 extends outside the casing 211 and is connected to the electrode assembly 212. Another part of the electrode terminal 213 extends outside the casing 211 to facilitate the input and output of electrical energy.

[0136] The electrical connection structure 40 refers to the conductive structure in the battery device 100 used to connect the individual battery cells 21. The electrical connection structure 40 can connect the individual battery cells 21 in series, parallel, or mixed. The electrical connection structure 40 can be a sheet structure, a strip structure, or a block structure. The electrical connection structure 40 can be a cuboid structure, a cylindrical structure, or a structure of other shapes. The material of the electrical connection structure 40 can include metal or other materials with conductive properties.

[0137] The electrical connection structure 40 is connected to the electrode terminals 213 of different battery cells 21. The electrical connection structure 40 can be connected to the electrode terminals 213 by welding, bonding or other means. When one end of the electrode terminal 213 extends outside the housing 211, the electrical connection structure 40 is connected to the end of the electrode terminal 213 facing the outside of the housing 211.

[0138] At least a portion of the sampling unit 311 is located between the electrical connection structure 40 and the housing 211. Depending on the shape and volume of the electrical connection structure 40 and the sampling unit 311, the sampling unit 311 may be completely located between the electrical connection structure 40 and the housing 211, in which case the sampling unit 311 may be completely covered by the electrical connection structure 40. Alternatively, the sampling unit 311 may be only partially located between the electrical connection structure 40 and the housing 211, in which case the sampling unit 311 may be only partially covered by the electrical connection structure 40.

[0139] Since one end of the electrode terminal 213 extends beyond the outer casing 211, and the electrical connection structure 40 is connected to the end of the electrode terminal 213 that extends beyond the outer casing 211, there is a gap between the electrical connection structure 40 and the outer casing 211. Furthermore, since the thickness of the sampling section 311 is generally small, at least a portion of the sampling section 311 is located between the electrical connection structure 40 and the outer casing 211 to better utilize the space within the battery device 100 and reduce the negative impact of the arrangement of multiple sampling sections 311 on the energy density of the battery device 100.

[0140] When the electrical connection structure 40 is electrically connected to one end of the electrode terminal 213, the sampling unit 311 can be electrically connected to the electrode terminal 213 or to the electrical connection structure 40.

[0141] In this embodiment, the sampling unit 311 is located between the electrical connection structure 40 and the outer casing 211, utilizing the space below the electrical connection structure 40, thereby better reducing the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0142] refer to Figure 4 , Figure 8 In some embodiments, the sampling element 31 further includes a connecting portion 312, and each sampling element 311 is connected to the connecting portion 312.

[0143] The connecting part 312 refers to the structure in the sampling component 31 used to connect the various sampling parts 311. The connecting part 312 can transmit the status information collected by the sampling parts 311. The connecting part 312 may include a wire harness, a flexible printed circuit board (FPC) or other structures that can transmit status information. The sampling part 311 may be a square sheet structure, a cylindrical strip structure or other shaped structural components. The connecting part 312 and the sampling part 311 may be connected by welding, bonding or other means, or the connecting part 312 and the sampling part 311 may be integrally formed.

[0144] The connecting part 312 can be connected to one side of the sampling part 311 along the length direction of the sampling part 311. When the length direction of the sampling part 311 is parallel to the first direction, the connecting part 312 can be connected to one side of the sampling part 311 along the first direction.

[0145] In addition to being connected to each sampling unit 311, the connection part 312 can also be connected to a control device or other electrical structure to transmit the status information collected by the sampling unit 31 to the corresponding control device or electrical structure.

[0146] Since the sampling component 31 includes at least two sampling parts 311, a connecting part 312 is provided to connect to the control device or other electrical structure through the connecting part 312, thereby reducing the number of electrical connection parts 312 between the sampling component 31 and the control device or other electrical structure, simplifying the connection structure between the sampling component 31 and the control device or other electrical structure, and reducing space occupation.

[0147] In this embodiment, a connecting part 312 is provided and connected to each sampling part 311, so that each sampling part 311 can be connected to the connected control device or other electrical structure through the connecting part 312. This reduces the connection structure between each sampling part 311 and the connected control device or other electrical structure, further reduces the space occupation of the sampling structure 30, and further reduces the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0148] In some embodiments, the connection portion 312 is further connected to a connector 313 so that the sampling element 31 can be connected to other control devices or electrical structures through the connector 313.

[0149] In some embodiments, a first buffer structure is provided between the connecting portion 312 and the adjacent battery cell 21.

[0150] The first buffer structure refers to a structure that can separate the connecting part 312 and the battery cell 21 to reduce direct contact between the connecting part 312 and the battery cell 21. The first buffer structure can be a rectangular sheet structure, or a prism structure, a cylindrical structure, or other shapes. The first buffer structure is a flexible structure to absorb the collision energy generated by the collision between the connecting part 312 and the battery cell 21, and reduce the damage that the connecting part 312 may suffer. The material of the first buffer structure can include rubber, silicone, or other flexible materials.

[0151] The first buffer structure can be connected to the outer casing 211 of the battery cell 21 or to the connecting part 312; the first buffer structure can be connected to the corresponding outer casing 211 or connecting part 312 by adhesive, snap-fit ​​or other means.

[0152] Because the battery device 100 is prone to collision between the connecting part 312 and the battery cell 21 when subjected to vibration or shaking, the collision between the connecting part 312 and the battery cell 21 may cause friction damage or collision damage to the connecting part 312, which may easily interfere with the transmission of status information.

[0153] Accordingly, in this embodiment, a first buffer structure is provided between the connecting part 312 and the adjacent battery cell 21 to reduce direct friction and collision between the connecting part 312 and the battery cell 21, thereby reducing the risk of friction damage and collision damage to the connecting part 312.

[0154] In some embodiments, a second buffer structure is provided between the connecting portion 312 and the inner surface of the housing 10.

[0155] The second buffer structure refers to a structure that can separate the connecting part 312 from the box 10 to reduce direct contact between the connecting part 312 and the box 10. The second buffer structure can be a rectangular sheet structure, or a prism structure, a cylindrical structure, or other shapes. The second buffer structure is a flexible structure to absorb the collision energy generated by the collision between the connecting part 312 and the box 10, and reduce the damage that the connecting part 312 may suffer. The material of the second buffer structure can include rubber, silicone, or other flexible materials.

[0156] The second buffer structure can be connected to the housing 10 or the connecting part 312; the second buffer structure can be connected to the corresponding housing 10 or connecting part 312 by adhesive, snap-fit ​​or other means.

[0157] Because the battery device 100 is prone to collision between the connecting part 312 and the housing 10 when subjected to vibration or shaking, the collision between the connecting part 312 and the housing 10 may cause friction damage or collision damage to the connecting part 312, which may easily interfere with the transmission of status information.

[0158] Accordingly, in this embodiment, a second buffer structure is provided between the connecting part 312 and the inner surface of the housing 10 to reduce direct friction and collision between the connecting part 312 and the housing 10, thereby reducing the risk of friction damage and collision damage to the connecting part 312.

[0159] refer to Figure 7 , Figure 11 In some embodiments, the sampling structure 30 includes at least two sampling elements 31.

[0160] The sampling structure 30 includes at least two sampling elements 31. The sampling structure 30 may include only two sampling elements 31 or three or more sampling elements 31. Depending on the structure of the sampling elements 31, the at least two sampling elements 31 may be stacked, that is, the at least two sampling elements 31 may completely overlap. Depending on the structure of the sampling elements 31, the at least two sampling elements 31 may also be arranged along the second direction. In this case, the at least two sampling elements 31 may not overlap at all or may only partially overlap.

[0161] For example, in the case where a sampling element 31 includes two sampling sections 311, the two sampling sections 311 are located on both sides of the same electrode terminal 213. In this case, one of the sampling sections 311 of the two sampling elements 31 can overlap between the two electrode terminals 213, and the other sampling section 311 of the two sampling elements 31 can be located on the opposite sides of the two electrode terminals 213.

[0162] For example, in the case where a sampling element 31 includes two sampling sections 311, the two sampling sections 311 are located on both sides of the same electrode terminal 213. In this case, one of the sampling sections 311 of the two sampling elements 31 can be arranged in the second direction between the two electrode terminals 213, and the other sampling section 311 of the two sampling elements 31 can be located on the opposite sides of the two electrode terminals 213.

[0163] For example, in the case where a sampling element 31 includes three sampling sections 311, two sampling elements 31 can completely overlap.

[0164] In this embodiment, the sampling structure 30 includes at least two sampling elements 31, which increases the volume of the sampling structure 30 and allows the sampling structure 30 to have more positions to connect with each battery cell 21, so that the sampling structure 30 can collect the status information of each battery cell 21.

[0165] refer to Figure 7 , Figure 11 In some embodiments of the sampling structure 30 that include at least two sampling elements 31, at least a portion of each sampling element 31 is stacked along a third direction, which is perpendicular to the first and second directions.

[0166] The third direction is perpendicular to the first and second directions. The third direction can be the height direction Z of the battery device 100, or it can be other directions.

[0167] The third direction can be parallel to the height direction of the electrode terminal 213, that is, each sampling element 31 is stacked in the height direction of the electrode terminal 213. Since a section of the electrode terminal 213 protrudes from the outer shell 211 and extends beyond the outer shell 211, the space formed by the height of the electrode terminal 213 protruding from the outer shell 211 is usually difficult to install other electrical structures. Therefore, the sampling elements 31 are stacked in the height direction of the electrode terminal 213 to make full use of the space formed by the height of the electrode terminal 213. This arrangement can increase the volume of the sampling structure 30 so that there are more positions on the sampling structure 30 to connect with each battery cell 21. This arrangement can also reduce the negative impact of the increase in the volume of the sampling structure 30 on the energy density of the battery device 100.

[0168] Understandably, regardless of whether the sampling element 31 is a wire harness, a flexible printed circuit (FPC), or other structure, the thickness of the sampling element 31 is much smaller than the height of the electrode terminal 213; therefore, the height of multiple sampling elements 31 stacked together is not likely to be higher than the electrode terminal 213, thereby reducing the negative impact of the sampling structure 30 on the energy density of the battery device 100.

[0169] For example, the sampling structure 30 includes two sampling elements 31, which are stacked along a third direction.

[0170] In this embodiment, the sampling components 31 are stacked along a third direction. This arrangement utilizes the space formed by the height of the electrode terminals 213, which can increase the volume of the sampling structure 30 without increasing the internal space of the housing 10, thus making better use of the internal space of the housing 10.

[0171] In some embodiments where the sampling components 31 are stacked along a third direction, the sampling component 31 further includes a connecting portion 312, and the sampling portion 311 of each sampling component 31 is connected to the connecting portion 312; the connecting portions 312 of different sampling components 31 are all located on the same side of the sampling portion 311 connected to them along the first direction, and a third buffer structure is provided between two adjacent connecting portions 312.

[0172] The third buffer structure refers to a structure that can separate two adjacent connecting parts 312 to reduce direct contact between them. The third buffer structure can be a rectangular sheet structure, a prism structure, a cylindrical structure, or other shapes. The third buffer structure is a flexible structure to absorb the collision energy generated by the collision between two adjacent connecting parts 312 and reduce the potential damage to the connecting parts 312. The material of the third buffer structure can include rubber, silicone, or other flexible materials. The third buffer structure can be connected to the corresponding connecting parts 312 by bonding, snapping, or other means.

[0173] When at least two sampling elements 31 are stacked, the connection portion 312 of two adjacent sampling elements 31 is prone to friction and collision, which may cause friction damage or collision damage to the connection portion 312 and easily interfere with the transmission of status information.

[0174] Accordingly, in this embodiment, a third buffer structure is provided between the connecting portions 312 of different sampling components 31 to reduce direct friction and collision between adjacent connecting portions 312, thereby reducing the risk of friction damage and collision damage to the connecting portions 312.

[0175] refer to Figure 12 , Figure 13 In some embodiments where the sampling structure 30 includes at least two sampling elements 31, the sampling structure 30 includes at least a first sampling element 31a and a second sampling element 31b, the first sampling element 31a and the second sampling element 31b being alternately arranged along a second direction; the first sampling element 31a includes at least a first sampling portion 311a and a second sampling portion 311b, the first sampling portion 311a being located between two electrode terminals 213; the second sampling element 31b includes at least a third sampling portion 311c and a fourth sampling portion 311d, the third sampling portion 311c being located between two electrode terminals 213.

[0176] When the sampling structure 30 includes at least two sampling elements 31, each sampling element 31 may include at least a first sampling element 31a and a second sampling element 31b. The first sampling element 31a and the second sampling element 31b have the same or substantially the same structure, but are located in different positions in the battery device 100.

[0177] The first sampling element 31a and the second sampling element 31b are alternately arranged along the second direction so that the first sampling element 31a and the second sampling element 31b can make fuller use of the space formed by the height of the electrode terminal 213. The number of the first sampling element 31a and the second sampling element 31b can be one, or two or more; when the number of the first sampling element 31a and the second sampling element 31b is one, the first sampling element 31a and the second sampling element 31b are arranged along the second direction; when the number of the first sampling element 31a and the second sampling element 31b is two or more, the first sampling element 31a and the second sampling element 31b are alternately arranged along the second direction.

[0178] The first sampling element 31a includes a first sampling section 311a and a second sampling section 311b. When the first sampling element 31a includes at least two sampling sections 311, there may be only one first sampling section 311a and two or more second sampling sections 311b. The first sampling section 311a is located between two electrode terminals 213 of the same battery cell 21, and the second sampling section 311b may be located on the side of any electrode terminal 213 of the same battery cell 21 away from the first sampling section 311a.

[0179] Similar to the first sampling element 31a, the second sampling element 31b includes a third sampling section 311c and a fourth sampling section 311d. When the second sampling element 31b includes at least two sampling sections 311, there may be only one third sampling section 311c and two or more fourth sampling sections 311d. The third sampling section 311c is located between two electrode terminals 213 of the same battery cell 21, and the fourth sampling section 311d may be located on the side of any electrode terminal 213 of the same battery cell 21 opposite to the first sampling section 311a.

[0180] For example, depending on the arrangement of the first sampling element 31a and the second sampling element 31b, the first sampling part 311a and the third sampling part 311c can be arranged adjacently or stacked, and are located between the two electrode terminals 213 of the same battery cell 21.

[0181] Example, reference Figure 12 , Figure 13 When each battery cell 21 is arranged along the first direction to form a battery cell assembly 20, the length direction of each sampling part 311 is parallel to the first direction and spans across each battery cell 21. At this time, the first sampling part 311a and the third sampling part 311c are between the electrode terminals 213 of the same battery cell 21, and the second sampling part 311b and the fourth sampling part 311d are respectively on the side of different electrode terminals 213 away from the first sampling part 311a.

[0182] This embodiment provides a sorting arrangement of sampling components 31, such that the sampling structure 30 includes a first sampling component 31a and a second sampling component 31b, and the first sampling component 31a and the second sampling component 31b are arranged alternately to better utilize the space between the electrode terminals 213 and the space between the electrode terminals 213 and the housing 10. This increases the volume of the sampling structure 30 without increasing the internal space of the housing 10, thus making better use of the internal space of the housing 10.

[0183] refer to Figure 12 , Figure 13 In some embodiments, the first sampling unit 311a and the third sampling unit 311c are arranged along the second direction.

[0184] When the first sampling unit 311a and the third sampling unit 311c are located between the two electrode terminals 213 of the same battery cell 21, the first sampling unit 311a and the third sampling unit 311c are arranged along the second direction, that is, the first sampling unit 311a and the third sampling unit 311c are arranged side by side.

[0185] Example, reference Figure 12 The first sampling unit 311a and the second sampling unit 311b can be located on both sides of the same electrode terminal 213, and the first sampling unit 311a is closer to the corresponding electrode terminal 213. There are no other sampling units 311 between the first sampling unit 311a and the corresponding electrode terminal 213. Correspondingly, the third sampling unit 311c and the fourth sampling unit 311d can be located on both sides of another electrode terminal 213, and the third sampling unit 311c is closer to the corresponding electrode terminal 213. There are no other sampling units 311 between the third sampling unit 311c and the corresponding electrode terminal 213.

[0186] Example, reference Figure 13 The first sampling section 311a and the second sampling section 311b can be located on both sides of the same electrode terminal 213. In addition to the electrode terminal 213, a third sampling section 311c can also be located between the first sampling section 311a and the second sampling section 311b. Correspondingly, the third sampling section 311c and the fourth sampling section 311d can be located on both sides of another electrode terminal 213. In addition to the corresponding electrode terminal 213, a first sampling section 311a can also be located between the third sampling section 311c and the fourth sampling section 311d.

[0187] When all sampling portions 311 of the same sampling member 31 are connected to the connecting portion 312, the connecting portion 312 of the first sampling member 31a and the connecting portion 312 of the second sampling member 31b can be located on different sides of the battery cell assembly 20 along the first direction, or the connecting portion 312 of the first sampling member 31a and the connecting portion 312 of the second sampling member 31b can be located on the same side of the battery cell assembly 20 along the first direction.

[0188] This embodiment further provides some arrangement of the first sampling component 31a and the second sampling component 31b, so that the first sampling part 311a and the third sampling part 311c are arranged side by side, so as to increase the volume of the sampling structure 30 and make better use of the space inside the box 10.

[0189] In some embodiments, the first sampling unit 311a and the third sampling unit 311c are stacked along a third direction, which is perpendicular to the first direction and the second direction.

[0190] The third direction is perpendicular to the first and second directions. The third direction can be the height direction Z of the battery device 100, or it can be other directions.

[0191] The third direction can be parallel to the height direction of the electrode terminal 213, that is, each sampling element 31 is stacked in the height direction of the electrode terminal 213. Since a section of the electrode terminal 213 protrudes from the outer shell 211 and extends beyond the outer shell 211, the space formed by the height of the electrode terminal 213 protruding from the outer shell 211 is usually difficult to install other electrical structures.

[0192] Accordingly, when the first sampling section 311a and the third sampling section 311c are located between the two electrode terminals 213 of the same battery cell 21, the first sampling section 311a and the third sampling section 311c are stacked in the third direction to make full use of the space formed by the height of the electrode terminals 213. This arrangement can increase the volume of the sampling structure 30 so that there are more positions on the sampling structure 30 to be connected to each battery cell 21. This arrangement can also reduce the negative impact of the increase in the volume of the sampling structure 30 on the energy density of the battery device 100.

[0193] This embodiment further provides some arrangement of the first sampling component 31a and the second sampling component 31b, so that the first sampling part 311a and the third sampling part 311c are stacked, which better increases the volume of the sampling structure 30 and makes better use of the space inside the box 10.

[0194] refer to Figure 14In some embodiments, the first sampling element 31a includes two first sampling portions 311a and a second sampling portion 311b, with the two first sampling portions 311a located on both sides of the second sampling portion 311b along a second direction; and / or the second sampling element 31b includes two third sampling portions 311c and a fourth sampling portion 311d, with the two third sampling portions 311c located on both sides of the fourth sampling portion 311d along a second direction.

[0195] When the first sampling unit 311a is between the two electrode terminals 213 of the same battery cell 21, the first sampling unit 31a includes two first sampling units 311a and one second sampling unit 311b. At this time, the two first sampling units 311a are respectively located between the two electrode terminals 213 of two different battery cells 21, while the second sampling unit 311b is located between adjacent electrode terminals 213 of two different battery cells 21.

[0196] For example, in the case where the battery device 100 includes two battery cell assemblies 20 arranged along the second direction, the two first sampling units 311a correspond to two different battery cell assemblies 20 respectively, and the second sampling unit 311b is located between the two battery cell assemblies 20 and corresponds to a part of the two battery cell assemblies 20.

[0197] Similar to the first sampling unit 31a, when the third sampling unit 311c is between the two electrode terminals 213 of the same battery cell 21, the second sampling unit 31b includes two third sampling units 311c and one fourth sampling unit 311d. In this case, the two third sampling units 311c are located between the two electrode terminals 213 of two different battery cells 21, respectively, while the fourth sampling unit 311d is located between the adjacent electrode terminals 213 of two different battery cells 21.

[0198] For example, in the case where the battery device 100 includes two battery cell assemblies 20 arranged along the second direction, the two third sampling units 311c correspond to two different battery cell assemblies 20 respectively, and the fourth sampling unit 311d is located between the two battery cell assemblies 20 and corresponds to a part of the two battery cell assemblies 20.

[0199] Depending on the number of battery cell assemblies 20, if the first sampling element 31a includes three sampling sections 311, the second sampling element 31b may include only two sampling sections 311, or the second sampling element 31b may include three sampling sections 311.

[0200] The following description uses a battery device 100 comprising two battery cell assemblies 20 arranged along a second direction as an example. (Refer to...) Figure 14The first sampling element 31a includes two first sampling sections 311a and one second sampling section 311b. The two first sampling sections 311a correspond to two battery cell assemblies 20 respectively. The second sampling section 311b is located between the two battery cell assemblies 20 and corresponds to the two battery cell assemblies 20. For a single battery cell 21, the first sampling section 311a is located between the two electrode terminals 213 of the same battery cell 21. The second sampling element 31b includes a third sampling section 311c and a fourth sampling section 311d and corresponds to the same battery cell assembly 20. For a single battery cell 21, the third sampling section 311c is located between the two electrode terminals 213 of the same battery cell 21. The third sampling section 311c is adjacent to the first sampling section 311a. The fourth sampling section 311d is located on the side of the electrode terminal 213 away from the other battery cell assembly 20 and away from the third sampling section 311c.

[0201] Understandably, when there are two or more battery cell modules 20, the structure and arrangement of the first sampling element 31a and the second sampling element 31b can be set according to the number of battery cell modules 20.

[0202] This embodiment further provides the structure of some first sampling parts 31a and second sampling parts 31b, so that the first sampling part 311a and the third sampling part 311c are located between the two electrode terminals 213, and the second sampling part 311b and the fourth sampling part 311d are located outside the electrode terminals 213. This can increase the volume of the sampling structure 30 without increasing the internal space of the housing 10, thus making better use of the internal space of the housing 10.

[0203] refer to Figure 14 In some embodiments, the battery device 100 includes at least two battery cell assemblies 20, which are arranged along a second direction; in the second direction, a second sampling unit 311b and / or a fourth sampling unit 311d are located between two adjacent electrode terminals 213 of different battery cell assemblies 20.

[0204] The battery device 100 includes at least two battery cell assemblies 20, that is, the battery device 100 may include only two battery cell assemblies 20 or three or more battery cell assemblies 20; when the battery cells 21 in the same battery cell assembly 20 are arranged along a first direction, at least two battery cell assemblies 20 are arranged along a second direction.

[0205] In the second direction, the second sampling unit 311b is located between two adjacent electrode terminals 213 of different battery cell assemblies 20, that is, the second sampling unit 311b corresponds to two adjacent battery cell assemblies 20; for a battery cell 21, the second sampling unit 311b is located between adjacent electrode terminals 213 of two battery cells 21 of two different battery cell assemblies 20.

[0206] Similar to the second sampling unit 311b, in the second direction, the fourth sampling unit 311d is located between two adjacent electrode terminals 213 of different battery cell assemblies 20, that is, the fourth sampling unit 311d corresponds to two adjacent battery cell assemblies 20; for battery cell 21, the fourth sampling unit 311d is located between adjacent electrode terminals 213 of two battery cells 21 of two different battery cell assemblies 20.

[0207] It is understandable that for the battery cell assembly 20 located at both ends in the second direction, the second sampling section 311b or the fourth sampling section 311d located at both ends in the second direction only corresponds to the corresponding battery cell assembly 20.

[0208] In this embodiment, the battery device 100 includes at least two battery cell assemblies 20. At this time, the first sampling unit 311a and the third sampling unit 311c are located between the two electrode terminals 213 of the same battery cell 21, and the second sampling unit 311b and the fourth sampling unit 311d are located between adjacent electrode terminals 213 of different battery cells 21. This makes fuller use of the internal space of the housing 10 and also increases the volume of the sampling structure 30.

[0209] refer to Figure 7 In some embodiments, in the second direction, the ratio between the size of the electrode terminal 213 and the size of the battery cell 21 is 0.15 to 0.25.

[0210] The dimension of electrode terminal 213 in the second direction is... Figure 7 The dimensions shown in L2 indicate that the dimension of the battery cell 21 in the second direction is the same as the dimension of the casing 211 in the second direction. Figure 7 The dimensions shown in L1.

[0211] Since the sampling section 311 is arranged along the second direction, the ratio of the size of the electrode terminal 213 in the second direction to the size of the battery cell 21 in the second direction determines the installation space that the sampling section 311 can have. The larger the ratio, the smaller the installation space of the sampling section 311 and the smaller the size of the sampling section 311 in the second direction.

[0212] The ratio of the size of the electrode terminal 213 in the second direction to the size of the battery cell 21 in the second direction ranges from 0.15 to 0.25. For example, the ratio can be 0.15, 0.17, 0.19, 0.21, 0.23, 0.25 or other values.

[0213] Since a single battery cell 21 includes two electrode terminals 213, the ratio of the sum of the dimensions of the two electrode terminals 213 to the dimension of the single battery cell 21 is in the range of 0.3 to 0.5; for example, the ratio can be 0.3, 0.34, 0.38, 0.42, 0.46, 0.5 or other values.

[0214] In this configuration, the battery cell 21 is smaller in size, the electrode terminal 213 occupies more space in the second direction, the installation space of the sampling unit 311 is smaller, and the size of the sampling unit 311 in the second direction is also smaller.

[0215] Accordingly, the sampling component 31 includes at least two sampling sections 311, which can make full use of the gap between the two electrode terminals 213 and the gap between the electrode terminals 213 and the housing 10, thereby increasing the volume of the sampling structure 30 and reducing the negative impact on the energy density of the battery device 100.

[0216] refer to Figure 7 In some embodiments, in the second direction, the size of the battery cell 21 is less than or equal to 150 mm.

[0217] The dimension of the battery cell 21 in the second direction is the width of the battery cell 21, which is also called the width of the battery cell 21. Figure 7 The dimension shown in L1 is less than or equal to 150mm. For example, the dimension can be 150mm, 140mm, 130mm, 120mm, 110mm or other values.

[0218] This dimension is positively correlated with the dimension of the sampling unit 311 in the second direction. The smaller the dimension of the battery cell 21 in the second direction, the smaller the space it can provide, and the smaller the dimension of the sampling unit 311 in the second direction is accordingly.

[0219] When the size of the battery cell 21 in the second direction is less than or equal to 150 mm, the size of the battery cell 21 is small, the space that can be provided to accommodate the sampling section 311 is also small, the installation space of the sampling section 311 is small, and the size of the sampling section 311 in the second direction is also small.

[0220] Accordingly, the sampling component 31 includes at least two sampling sections 311, which can make full use of the gap between the two electrode terminals 213 and the gap between the electrode terminals 213 and the housing 10, thereby increasing the volume of the sampling structure 30 and reducing the negative impact on the energy density of the battery device 100.

[0221] refer to Figure 7 In some embodiments, in the second direction, the size of the battery cell 21 is less than or equal to 120 mm.

[0222] The dimension of the battery cell 21 in the second direction is the width of the battery cell 21, which is also called the width of the battery cell 21. Figure 7 The dimension shown in L1 is less than or equal to 120mm. For example, the dimension can be 120mm, 110mm or other values.

[0223] This dimension is positively correlated with the dimension of the sampling unit 311 in the second direction. The smaller the dimension of the battery cell 21 in the second direction, the smaller the space it can provide, and the smaller the dimension of the sampling unit 311 in the second direction is accordingly.

[0224] When the size of the battery cell 21 in the second direction is less than or equal to 120 mm, the size of the battery cell 21 is small, the space that can be provided to accommodate the sampling section 311 is also small, the installation space of the sampling section 311 is small, and the size of the sampling section 311 in the second direction is also small.

[0225] Accordingly, the sampling component 31 includes at least two sampling sections 311, which can make full use of the gap between the two electrode terminals 213 and the gap between the electrode terminals 213 and the housing 10, thereby increasing the volume of the sampling structure 30 and reducing the negative impact on the energy density of the battery device 100.

[0226] refer to Figure 2 In some embodiments, in the first direction, the ratio of the size of the receiving cavity 13 to the size of the battery cell 21 is greater than or equal to 25.

[0227] When the first direction is the length direction of the battery device 100, the size of the receiving cavity 13 on the first square is the size of the receiving cavity 13 in the length direction X of the battery device 100, and the size of the battery cell 21 is the size of the battery cell 21 in the length direction X of the battery device 100.

[0228] Since the battery cells 21 are arranged along the first direction and are housed in the receiving cavity 13, the size of the receiving cavity 13 determines the number of battery cells 21 in the first direction. The size of the receiving cavity 13 in the first direction is positively correlated with the number of battery cells 21, while the size of the battery cells 21 in the first direction is negatively correlated with the number of battery cells 21. Accordingly, the ratio of the size of the receiving cavity 13 in the first direction to the size of the battery cells 21 in the first direction determines the number of battery cells 21. The larger the ratio, the more battery cells 21 are in the receiving cavity 13, and the smaller the size of a single battery cell 21 in the first direction.

[0229] The ratio of the dimension of the receiving cavity 13 in the first direction to the dimension of the battery cell 21 in the first direction is greater than or equal to 25. For example, the ratio can be 25, 26, 27, 28, 29, 30 or other values.

[0230] When the size ratio of the receiving cavity 13 to the battery cell 21 in the first direction is greater than or equal to 25, the number of battery cells 21 is relatively large, and there are also many parts on the sampling structure 30 that need to be connected to each battery cell 21, so a sampling structure 30 with a volume intersection is required.

[0231] Accordingly, the sampling element 31 includes at least two sampling sections 311, which increases the volume of the sampling structure 30, thereby providing sufficient space on the sampling structure 30 to connect with each battery cell 21 and to collect the status information of each battery cell 21.

[0232] In some embodiments, the battery device 100 includes at least two battery cell assemblies 20, an electrical connection structure 40, and a sampling structure 30.

[0233] The battery cell assembly 20 includes battery cells 21 arranged along the length direction X of the battery device 100, and each battery cell assembly 20 is arranged along the width direction Y of the battery device 100.

[0234] The battery cell 21 includes a housing 211 and an electrode terminal 213 disposed on the housing 211. The electrode terminal 213 is disposed on one side of the housing 211 along the height direction Z of the battery device 100, and the height direction of the electrode terminal 213 is parallel to the height direction Z of the battery device 100.

[0235] The electrical connection structure 40 is a sheet-like metal structure. The two ends of the electrical connection structure 40 are respectively connected to the electrode terminals 213 of two different battery cells 21. The electrical connection structure 40 is located above the battery cell 21 along the height direction Z of the battery device 100, and the electrical connection structure 40 is connected to the end of the electrode terminal 213 that is away from the outer casing 211 along the height direction Z of the battery device 100.

[0236] The sampling structure 30 includes at least two sampling elements 31, each sampling element 31 including at least two sampling portions 311 and a connecting portion 312 connected to each sampling portion 311; in the height direction Z of the battery device 100, the sampling portion 311 is located between the outer casing 211 and the electrical connection structure 40.

[0237] At least two sampling elements 31 include a first sampling element 31a and a second sampling element 31b. The first sampling element 31a includes a first sampling section 311a and a second sampling section 311b. The first sampling section 311a is located between two electrode terminals 213 of the same battery cell 21, and the second sampling section 311b is located on the side of the electrode terminal 213 away from the first sampling section 311a.

[0238] The second sampling unit 31b includes a third sampling section 311c and a fourth sampling section 311d. The third sampling section 311c is located between the two electrode terminals 213 of the same battery cell 21, and the fourth sampling section 311d is located on the side of the electrode terminal 213 away from the first sampling section 311a.

[0239] The third sampling unit 311c and the first sampling unit 311a are adjacent to each other, and the third sampling unit 311c and the first sampling unit 311a can be arranged side by side along the width direction Y of the battery device 100; the fourth sampling unit 311d and the second sampling unit 311b are respectively located on the side of the different electrode terminals 213 away from the first sampling unit 311a along the width direction Y of the battery device 100.

[0240] Secondly, embodiments of this application also provide an electrical device, including the battery device 100 provided in some embodiments of the first aspect.

[0241] In this power device, the sampling structure 30 makes full use of the space between the electrode terminals 213 of the battery cell 21, increasing the volume of the sampling structure 30 so that there are more positions on the sampling structure 30 to connect to more battery cells 21 and to facilitate the collection of more status information of battery cells 21; at the same time, with the increase in the volume of the sampling structure 30, the negative impact of the sampling structure 30 on the energy density of the battery device 100 can also be reduced.

[0242] The electrical device provided in this application embodiment can be applied to various electrical devices that use battery device 100, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box body has a receiving cavity inside; A battery cell assembly is housed in the receiving cavity. The battery cell assembly includes at least two battery cells arranged along a first direction. Each battery cell includes two electrode terminals arranged at intervals along a second direction. The second direction is set at an angle to the first direction. A sampling structure is housed in the receiving cavity. The sampling structure includes a sampling element, which includes at least two sampling sections. The sampling sections are used to collect the state information of the battery cell. The at least two sampling sections are arranged at intervals along the second direction so that at least one electrode terminal is located between two adjacent sampling sections.

2. The battery device according to claim 1, characterized in that, The number of sampling units is two, and the two sampling units are respectively located on both sides of any of the electrode terminals along the second direction.

3. The battery device according to claim 1, characterized in that, The number of sampling units is two, and the two sampling units are respectively located on opposite sides of the two electrode terminals along the second direction.

4. The battery device according to claim 1, characterized in that, The number of sampling units is three, and the three sampling units and the two electrode terminals are arranged alternately along the second direction.

5. The battery device according to any one of claims 1-4, characterized in that, The battery cell also includes a housing, and the electrode terminals are disposed on the housing; The battery device further includes an electrical connection structure, which is located on the side of the electrode terminals facing away from the housing, and is electrically connected to the electrode terminals of different battery cells. At least a portion of the sampling unit is located between the electrical connection structure and the housing.

6. The battery device according to any one of claims 1-5, characterized in that, The sampling component also includes a connecting part, and each sampling part is connected to the connecting part.

7. The battery device according to claim 6, characterized in that, A first buffer structure is provided between the connecting part and the adjacent battery cell.

8. The battery device according to claim 6 or 7, characterized in that, A second buffer structure is provided between the connecting part and the inner surface of the box.

9. The battery device according to any one of claims 1-8, characterized in that, The sampling structure includes at least two sampling elements.

10. The battery device according to claim 9, characterized in that, At least a portion of each of the sampling elements is stacked along a third direction, which is perpendicular to the first direction and the second direction.

11. The battery device according to claim 9 or 10, characterized in that, The sampling component further includes a connecting portion, and the sampling portion of each sampling component is connected to the connecting portion; The connecting portions of different sampling components are all located on the same side of the sampling portion connected to them along the first direction, and a third buffer structure is provided between two adjacent connecting portions.

12. The battery device according to claim 9, characterized in that, The sampling structure includes at least a first sampling element and a second sampling element, wherein the first sampling element and the second sampling element are alternately arranged along the second direction; The first sampling element includes at least a first sampling section and a second sampling section, wherein the first sampling section is located between the two electrode terminals; The second sampling element includes at least a third sampling section and a fourth sampling section, wherein the third sampling section is located between the two electrode terminals.

13. The battery device according to claim 12, characterized in that, The first sampling unit and the third sampling unit are arranged along the second direction.

14. The battery device according to claim 12, characterized in that, The first sampling unit and the third sampling unit are stacked along a third direction, which is perpendicular to the first direction and the second direction.

15. The battery device according to any one of claims 12-14, characterized in that, The first sampling element includes two first sampling sections and one second sampling section, wherein the two first sampling sections are located on both sides of the second sampling section along the second direction; and / or The second sampling element includes two third sampling sections and one fourth sampling section, with the two third sampling sections located on both sides of the fourth sampling section along the second direction.

16. The battery device according to any one of claims 12-15, characterized in that, The battery device includes at least two battery cell assemblies, and the at least two battery cell assemblies are arranged along the second direction; In the second direction, the second sampling section and / or the fourth sampling section are located between two adjacent electrode terminals of different battery cell assemblies.

17. The battery device according to any one of claims 1-16, characterized in that, In the second direction, the ratio between the size of the electrode terminal and the size of the battery cell is 0.15 to 0.

25.

18. The battery device according to any one of claims 1-17, characterized in that, In the first direction, the ratio of the size of the receiving cavity to the size of the battery cell is greater than or equal to 25.

19. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-18.

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