Battery device, power utilization device and battery sampling assembly

Abstract

The utility model discloses a battery device, a power utilization device and a battery sampling assembly, and relates to the technical field of batteries. Wherein the battery device comprises at least two battery monomers, a confluence piece and a flexible sampling plate, the confluence piece is connected with the at least two battery monomers, and the connected battery monomers can be electrically connected; and the flexible sampling plate is connected with the confluence sheet in an electromagnetic pulse welding mode so as to be electrically connected with the confluence sheet. According to the technical scheme, atomic bonding between the confluence piece and the flexible sampling plate is achieved in an electromagnetic pulse welding mode so as to achieve electrical connection between the confluence piece and the flexible sampling plate, generation of thermal stress and thermal deformation of a connection area between the confluence piece and the flexible sampling plate can be reduced, and the firmness of connection between the flexible sampling plate and the confluence piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device, an electrical device, and a battery sampling assembly. Background Art

[0002] In the related prior art, the connection between the flexible sampling plate and the bus bar is not firm, resulting in sampling failure. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery device, an electrical device, and a battery sampling assembly, aiming to improve the stability of the connection between the flexible sampling plate and the bus bar.

[0004] In a first aspect, the present application provides a battery device, including at least two battery cells, a bus bar, and a flexible sampling plate. The bus bar connects at least two battery cells and enables electrical connection between the connected battery cells; the flexible sampling plate is connected to the bus bar through atomic bonding to be electrically connected to the bus bar.

[0005] In this embodiment, by connecting the bus bar and the flexible sampling plate through atomic bonding and achieving electrical connection between the two, thus, in the connection area between the flexible sampling plate and the bus bar, the chemical bond action between atoms promotes their combination, obtaining a strong welded connection area; secondly, since atomic bonding does not rely on the high-temperature melting process, the generation of thermal stress and thermal deformation is reduced. Thus, by connecting the flexible sampling plate and the bus bar through atomic bonding, the strength, stability, durability and other properties of the welding part can be improved, thereby improving the reliability of the connection between the flexible sampling plate and the bus bar.

[0006] In some embodiments, the bus bar includes a bus bar body and a first connecting portion, and the first connecting portion is provided at the periphery of the bus bar body; the bus bar body connects at least two battery cells and enables electrical connection between the connected battery cells; the first connecting portion is connected to the flexible sampling plate through atomic bonding. The technical solution of this embodiment, by arranging the first connecting portion at the periphery of the bus bar body and connecting the first connecting portion to the flexible sampling plate through atomic bonding, thus, it is convenient to make the connection between the bus bar and the flexible sampling plate more simple, and can reduce the problems brought by space limitations or symmetry problems, thereby simplifying the production and maintenance processes; secondly, during the operation of the battery, heat usually concentrates in the contact area between the battery cell and the bus bar, especially the heat generated when current passes through the bus bar. In addition, by arranging the first connecting portion at the peripheral position of the bus bar body, a more uniform heat distribution can be achieved, reducing the excessive concentration of local heat and reducing the generation of hot spots.

[0007] In some embodiments, the first connecting portion has opposite first and second surfaces. The first surface is attached to the flexible sampling board, and a groove is provided on the second surface of the first connecting portion. The technical solution of this embodiment provides a thermal expansion buffer area for the two by providing a groove on the second surface of the first connecting portion, reducing the influence of thermal stress on the connection. The shape and structure of the groove may help provide some elasticity during thermal expansion, so that the connection part between the bus bar and the flexible sampling board will not cause poor contact due to local deformation or loosening. This thermal expansion buffering effect can reduce the fluctuation of the contact resistance, thereby reducing the difficulty of current passing caused by poor contact and reducing the heat accumulation caused by too high current density.

[0008] In some embodiments, the battery device includes a flexible circuit board. The flexible sampling board is integrally provided with the flexible circuit board, and the flexible circuit board and the flexible sampling board are electrically connected. In this embodiment, the flexible circuit board and the flexible sampling board are integrally provided, that is to say, the flexible circuit board and the flexible sampling board are produced as one circuit board. In this way, the number of connecting components between the flexible circuit board and the flexible sampling board can be reduced, and the risks of poor connection, unstable contact or mechanical damage can also be reduced, improving the overall reliability of the battery device.

[0009] In some embodiments, the number of flexible sampling boards is multiple, and each flexible sampling board is connected to at least one bus bar; the multiple flexible sampling boards are arranged on opposite sides of the flexible circuit board, and the multiple flexible sampling boards are arranged at intervals along the length direction of the flexible sampling board. In this embodiment, by arranging the multiple flexible sampling boards at intervals along the length direction of the flexible circuit board and connecting them to at least one bus bar, efficient voltage sampling of multiple battery cells or battery modules can be achieved. In this way, a more reasonable layout and interval arrangement can be realized, optimizing the space utilization of the battery device and improving the overall structural compactness of the battery device.

[0010] In some embodiments, the flexible circuit board has opposite side edges along its length direction; among the two side edges of the flexible circuit board, at least one side edge is provided with an avoidance groove, and at least a part of the flexible sampling board is arranged in the avoidance groove. The technical solution of this embodiment provides an avoidance groove on the side edge of the flexible circuit board, so that at least a part of the flexible sampling board can be embedded in the avoidance groove. In this way, the width of the flexible sampling board can be shortened, thus realizing a more compact structural design.

[0011] In some embodiments, the flexible sampling board includes a second connecting portion and a sampling portion provided on the second connecting portion. The second connecting portion is connected to the flexible circuit board, and the sampling portion is connected to the first connecting portion by atomic bonding; at least one of the second connecting portion and the sampling portion is arranged in the avoidance groove. In this embodiment, by arranging the second connecting portion and / or the sampling portion in the avoidance groove, in some usage scenarios, space interference and conflicts can be reduced, and the layout of the circuit board can be optimized.

[0012] In some embodiments, the avoidance groove has side groove walls and a bottom groove wall that are connected to each other. One end of the second connecting portion is connected to the flexible circuit board at the side groove wall, and a part of the second connecting portion protrudes towards the bottom groove wall. In this embodiment, the part of the second connecting portion protruding towards the bottom groove wall can effectively save space, make the layout of the flexible circuit board more compact, and adapt to complex battery or device designs; the part of the second connecting portion protruding towards the bottom groove wall, that is to say, the flexible sampling board is bent. The bent flexible sampling board helps to reduce stress concentration on the circuit board, enhance seismic and shock resistance capabilities, and improve the stability and reliability of the flexible sampling board.

[0013] In some embodiments, the sampling portion has opposite third and fourth surfaces, and the third surface is in contact with the first surface; wherein, at least the third surface is a metal surface. In this embodiment, the third surface is the contact surface with the bus bar. That is to say, the contact surface where the sampling portion is connected to the bus bar is a metal surface, which can reduce contact resistance, improve the stability and accuracy of sampling signal transmission; in addition, only setting the metal surface at the contact surface with the bus bar can reduce material costs; furthermore, by only setting the metal surface at the contact surface, other electrical interferences can be reduced.

[0014] In some embodiments, the number of bus bars is multiple, and the multiple bus bars are divided into at least two bus bar rows along a first direction. The bus bars within the bus bar rows are arranged at intervals along a second direction; a flexible circuit board is provided between adjacent bus bar rows, and the flexible circuit board extends along the second direction; the first direction and the second direction intersect. The technical solution of this embodiment can optimize the layout of the bus bars and the flexible circuit board by dividing the multiple bus bars into bus bar rows and arranging a flexible circuit board between adjacent bus bar rows, thereby improving the space utilization rate.

[0015] In some embodiments, the battery device further includes a carrier, and the carrier is disposed between the bus bar and the battery cell. The carrier is used to carry the flexible sampling board, the flexible circuit board, and the bus bar. In this embodiment, by providing the carrier, on the one hand, it is convenient to carry and install the bus bar, the flexible sampling board, and the flexible circuit board, etc. On the other hand, the carrier can play an insulating and isolating role between the battery cell, the flexible sampling board, and the flexible circuit board, etc., so as to reduce the possibility of the battery short - circuiting.

[0016] In some embodiments, the bus bar and the flexible sampling board are connected by atomic bonding through electromagnetic pulse welding.

[0017] In some embodiments, the flexible sampling board is a voltage sampling board.

[0018] This application also proposes an electrical device, and the electrical device includes a battery device, and the battery device is used to provide electrical energy.

[0019] The present application also provides a battery sampling assembly, which includes a bus bar and a flexible sampling board. The bus bar is used for electrically connecting battery cells; the flexible sampling board is connected to the bus bar by atomic bonding to be electrically connected to the bus bar.

[0020] In some embodiments, the battery sampling assembly further includes a carrier, and the flexible sampling board and the bus bar are disposed on the carrier.

[0021] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

[0022] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0024] Figure 2 is an exploded structural diagram of a battery according to some embodiments of the present application;

[0025] Figure 3 is a schematic structural diagram of a battery device according to some embodiments of the present application;

[0026] Figure 4 is Figure 3 an exploded structural diagram of;

[0027] Figure 5 is Figure 3 a partial enlarged view of the flexible circuit board and the flexible sampling board in;

[0028] Figure 6 is a schematic structural diagram of a bus bar according to some embodiments.

[0029] The reference numerals in the specific embodiments are as follows:

[0030] 1. Vehicle;

[0031] 10. Battery device; 11. Battery sampling component; 100. Bus bar; 110. Bus bar body; 120. First connection part; 121. First surface; 122. Second surface; 200. Flexible sampling board; 210. Second connection part; 220. Sampling part; 221. Third surface; 222. Fourth surface; 300. Flexible circuit board; 301. Avoidance groove; 400. Carrier; 500. Battery cell;

[0032] 20. Controller;

[0033] 30. Motor.

[0034] The realization, functional features and advantages of the purpose of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0035] The embodiments of the technical solutions of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0038] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0040] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0043] With the wide application of batteries in energy storage power systems, electric vehicles and other fields, for example: energy storage power systems include hydropower, wind power, thermal power, solar power and other power station energy storage systems; electric vehicles include electric cars, electric motorcycles and electric bicycles, etc.; people pay particular attention to the safety issues of batteries. In order to improve the safety of battery use, voltage signals of multiple battery cells are usually collected inside the battery. By transmitting the detected voltage signals of the battery to the battery management system (BMS), the battery management system combines means such as comparing voltage thresholds, observing voltage fluctuations, monitoring the temperature of battery cells, and checking the voltage balance of the battery pack to determine whether the voltage is abnormal.

[0044] Battery devices are usually designed to be compact and irregular in shape. Especially in applications such as electric vehicles and portable electronic devices, the arrangement and form of battery cells or battery modules in the battery device can be very complex. The flexible sampling board has good bendability and can easily adapt to these complex battery layouts. It can conform to or bypass various parts of the battery pack so that the sampling points cover each battery cell or multiple connection points of the battery module, reducing the space occupation; secondly, due to the light weight and high-density design of the flexible sampling board, using the flexible sampling board can effectively reduce the volume, which is particularly suitable for occasions with limited space and strict weight requirements. However, in the battery devices in related technologies, there is a problem that the connection between the flexible sampling board and the bus bar is not reliable, resulting in sampling failure.

[0045] Based on the above considerations, in order to solve the problem that the connection between the flexible sampling board and the bus bar in the battery device is not reliable, resulting in sampling failure, this application proposes a new type of battery device. By connecting the flexible sampling board and the bus bar in the form of atomic bonding, when the flexible sampling board and the bus bar adopt atomic bonding, the bonding of the welding parts of the two is achieved through the diffusion and rearrangement of surface metal atoms under high speed and high pressure, and then a tight intermetallic atomic bonding is obtained at the atomic level. Adopting atomic bonding between the flexible sampling board and the bus bar can improve the strength, stability, durability and other properties of the welding parts, thereby improving the reliability of the connection between the flexible sampling board and the bus bar.

[0046] Further explanation is that the above-mentioned battery device may include a plurality of battery cells. Among them, the battery cell can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The shape of the battery cell can be cylindrical, flat, cuboid or other shapes, and this application does not make specific limitations on the shape of the battery cell. A plurality of battery cells can be connected in series, in parallel, or in a series-parallel hybrid connection. After several battery cells are connected in series, in parallel or in a series-parallel hybrid connection, they can form a battery module, and the sampling component can at least be used to collect the voltage signals of the battery module composed of a plurality of battery cells.

[0047] The battery device disclosed in the embodiments of this application can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. The power system of the power-consuming device can be composed of the battery device disclosed in this application. In this way, the reliability of the connection between the flexible sampling board and the bus bar can be improved, the probability of connection failure between the sampling board and the bus bar can be reduced, and the stability of the battery detection performance can be enhanced.

[0048] The embodiments of the present application provide an electrical device using the battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0049] For the convenience of description, the following embodiments will take a vehicle 1, which is an electrical device according to an embodiment of the present application, as an example for description.

[0050] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1 provided by some embodiments of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is disposed inside the vehicle 1, and the battery device 10 may be disposed at the bottom, the head or the tail of the vehicle 1. The battery device 10 may be used to supply power to the vehicle 1. For example, the battery device 10 may be used as the operating power source of the vehicle 1. The vehicle 1 may further include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, for the working power requirements during the start, navigation and driving of the vehicle 1.

[0051] In some embodiments of the present application, the battery device 10 may not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0052] Please refer to Figure 2 , Figure 2 which is a schematic exploded view of the battery provided by some embodiments of the present application. The battery device 10 includes a box body and battery cells 500, and the battery cells 500 are accommodated in the box body. Among them, the box body is used to provide an accommodation space for the battery cells 500, and the box body may adopt various structures.

[0053] In the battery device 10, there may be multiple battery cells 500. The multiple battery cells 500 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 500. The multiple battery cells 500 can be directly connected in series, parallel, or in a combined series-parallel connection and then the whole formed by the multiple battery cells 500 is accommodated in a box. Of course, in the battery device 10, multiple battery cells 500 can also be first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection as a whole and accommodated in a box. The battery device 10 can also include other structures. For example, the battery device 10 can also include a busbar component for realizing the electrical connection among the multiple battery cells 500.

[0054] Among them, each battery cell 500 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 500 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0055] Next, the structure of the battery device proposed in this application will be explained. For the convenience of understanding and explanation, in the specification appendix of this application Figures 1 to 6 The slots or surfaces are indicated by solid-line arrows.

[0056] In an embodiment of this application, please refer to Figures 3 to 6 , the battery device 10 includes at least two battery cells 500, a busbar 100, and a flexible sampling board 200. The busbar 100 connects at least two battery cells 500 and enables the connected battery cells 500 to achieve electrical connection; the flexible sampling board 200 is connected to the busbar 100 through atomic bonding to be electrically connected to the busbar 100.

[0057] The busbar 100 is used to be electrically connected to at least two battery cells 500 in the battery device 10 so that the connected battery cells 500 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means including both parallel and series connections. Among them, the material of the busbar 100 can be aluminum so that the busbar 100 has good electrical conductivity and improves the overcurrent capacity. Of course, the material of the busbar 100 can also be copper or other materials with electrical conductivity. In addition, the number of busbars can be one. Of course, it can also be two or more, and can also be adaptively set according to the number of battery cells 500 to be electrically connected.

[0058] In the battery device 10, in order to meet the requirements for real-time monitoring of data such as battery status, charge and discharge process, temperature, current, etc.; common sampling boards include voltage sampling boards, temperature sampling boards, current sampling boards, power sampling boards, status monitoring sampling boards, and integrated BMS sampling boards, etc. In this embodiment, the above several sampling boards can all be set to be flexible, that is, flexible voltage sampling boards, flexible current sampling boards, flexible temperature sampling boards, flexible power sampling boards, flexible status monitoring sampling boards, and flexible integrated BMS sampling boards, etc. can all be the flexible sampling board 200 of this embodiment; the following will take the voltage sampling board as an example for introduction.

[0059] The flexible voltage sampling board is used to monitor the voltage of the battery cell 500 or the battery pack, in order to keep the voltage of each battery cell 500 within a safe range. In a system where multiple battery cells are connected in series, the voltage of each battery cell 500 needs to be measured separately. The voltage sampling board usually needs to be connected to the bus bar 100 to improve the accuracy of measuring the voltage of each battery cell 500.

[0060] Electrical connection means connecting different components in a circuit through a conductive material so that current can flow between these components to achieve the transmission of electrical energy and the transfer of signals. In this embodiment, the flexible sampling board 200 is electrically connected to the bus bar 100, and electrical energy transmission and signal transfer can be achieved between the flexible sampling board 200 and the bus bar 100.

[0061] In this embodiment, in order to improve the stability of the connection between the flexible sampling board 200 and the bus bar 100, the flexible sampling board 200 and the bus bar 100 are connected by atomic bonding.

[0062] Among them, atomic bonding refers to that in the contact surface between the flexible sampling board 200 and the bus bar 100, the metal atoms of both the flexible sampling board 200 and the bus bar 100 are directly combined on the contact surface through diffusion, slip, or lattice docking, etc. The chemical bond action between the atoms of the flexible sampling board 200 and the bus bar 100 promotes their combination, thereby obtaining a strong welded connection part.

[0063] In this application, the implementation method of connecting the flexible sampling board 200 and the bus bar 100 by atomic bonding can be achieved by electromagnetic pulse welding, laser welding, or ultrasonic welding. The following will take electromagnetic pulse welding as an example for elaboration.

[0064] Electromagnetic Pulse Welding (EMPW) is a solid-state welding technique. In this embodiment, exemplarily, a discharge coil of an electromagnetic pulse welding device generates an electromagnetic field, thereby generating an electromagnetic force that pushes the bus bar 100 towards the flexible sampling board 200, so as to fuse the two and achieve atomic bonding to realize the connection.

[0065] Its working principle is as follows: Utilizing the eddy current effect generated by the electromagnetic pulse, a strong electromagnetic force is formed at the welding part of the bus bar 100, prompting the two metal surfaces to collide at high speed in an extremely short time. This process can effectively remove the surface oxide layer and contaminants, enabling direct contact between the metal surfaces; during the contact process, the atoms on the metal surfaces of the bus bar 100 and the flexible sampling board 200 achieve microscopic contact through high pressure and high speed, and the chemical bond action between the atoms causes them to combine, forming a strong welded connection part. Since the electromagnetic pulse welding process is instantaneous, the welding area will not undergo significant melting, there is no continuous high-temperature effect, and there is no obvious heat-affected zone in the welding area, so that the connection part between the bus bar 100 and the flexible sampling board 200 maintains the original mechanical properties of the material. In this way, atomic bonding between the bus bar 100 and the flexible sampling board 200 is achieved through electromagnetic pulse welding to realize the electrical connection between the two, which can reduce the generation of thermal stress and thermal deformation in the connection area between the bus bar 100 and the flexible sampling board 200, and improve the reliability of the connection between the flexible sampling board 200 and the bus bar 100.

[0066] The technical solution of this application connects the bus bar 100 and the flexible sampling board 200 through atomic bonding and realizes the electrical connection between the two. In this way, in the connection area between the flexible sampling board 200 and the bus bar 100, the chemical bond action between the atoms causes them to combine, thereby obtaining a strong welded connection area; secondly, since atomic bonding does not rely on the high-temperature melting process, the generation of thermal stress and thermal deformation is reduced. In this way, atomic bonding is adopted between the flexible sampling board 200 and the bus bar 100, reducing common defects in traditional welding (such as pores, inclusions or cracks, etc.), and can improve the strength, stability, durability and other properties of the welding part, thereby improving the reliability of the connection between the flexible sampling board 200 and the bus bar 100.

[0067] According to some embodiments of this application, with reference to Figure 6 , and further with reference to Figures 3 to 5 , the bus bar 100 includes a bus bar body 110 and a first connection part 120. The first connection part 120 is arranged at the periphery of the bus bar body 110; the bus bar body 110 is connected to at least two battery cells 500 and enables electrical connection between the connected battery cells 500; the first connection part 120 is connected to the flexible sampling board 200 through atomic bonding.

[0068] Among them, the busbar body 110 is the connecting part with at least two battery cells 500. Similar to the previous embodiment, through this busbar body 110, at least two battery cells 500 in the battery device 10 are electrically connected, and the connected battery cells 500 can be connected in series, parallel, or in a mixed connection, where the mixed connection includes both parallel and series connections. The busbar body 110 and the first connection part 120 are usually integrally formed. The busbar body 110 is generally sheet-shaped. In this embodiment, the first connection part 120 is provided at the periphery of the busbar body 110. The periphery of the busbar body 110 refers to the peripheral side along the thickness direction of the busbar body 110 (for details, refer to Figure 4 ).

[0069] In the technical solution of this embodiment, by arranging the first connection part 120 at the periphery of the busbar body 110, the first connection part 120 is connected to the flexible sampling board 200 through atomic bonding. In this way, it is convenient to make the connection between the busbar 100 and the flexible sampling board 200 more simple, and it can reduce the problems caused by space limitations or symmetry issues, thereby simplifying the production and maintenance processes. Secondly, during the operation of the battery, heat usually concentrates in the contact area between the battery cell 500 and the busbar 100, especially the heat generated when the current passes through the busbar 100. In addition, by arranging the first connection part 120 at the peripheral position of the busbar body 110, a more uniform heat distribution can be achieved, reducing the excessive concentration of local heat and the generation of hot spots.

[0070] According to some embodiments of the present application, referring to Figure 6 and further referring to Figures 3 to 5 , the first connection part 120 has opposite first surface 121 and second surface 122. The first surface 121 is attached to the flexible sampling board 200, and the first connection part 120 is provided with a groove at the second surface 122.

[0071] The first connection part 120 is also sheet-shaped. The first surface 121 and the second surface 122 refer to the two opposite surfaces along the thickness direction of the second connection part 210. Among them, the first surface 121 is attached to the flexible sampling board 200, that is to say, the flexible sampling board 200 forms an atomic bond with the busbar 100 at the first surface 121. The second surface 122 is opposite to the first surface 121, that is to say, after the flexible sampling board 200 and the busbar 100 are connected through atomic bonding, the second surface 122 is the side facing away from the first surface 121.

[0072] The first connection part 120 is provided with a groove at the second surface 122. This groove can be understood as that the second surface 122 has a depression, a protrusion, or shows surface unevenness, etc. The groove provided on the second surface 122, although not directly used for contacting current conduction, can affect the contact stability between the entire connection part and the flexible sampling board 200.

[0073] It can be understood that thermal expansion is a common phenomenon when current passes through a conductor, especially during high-current transmission. During the use of the materials of the bus bar 100 and the flexible sampling board 200, they may have different coefficients of thermal expansion, resulting in relative sliding or deformation during the heat conduction process.

[0074] The technical solution of this embodiment provides a thermal expansion buffer area for the two by setting a groove on the second surface 122 of the first connection part 120, reducing the influence of thermal stress on the connection. The shape and structure of the groove may help provide some elasticity during thermal expansion, so that the connection part between the bus bar 100 and the flexible sampling board 200 will not cause poor contact due to local deformation or loosening. This thermal expansion buffering effect can reduce the fluctuation of the contact resistance, thereby reducing the difficulty of current passing caused by poor contact and reducing the heat accumulation caused by too high current density.

[0075] According to some embodiments of the present application, with reference to Figure 3 , and further with reference to Figure 4 and Figure 5 , the battery device 10 includes a flexible circuit board 300. The flexible sampling board 200 is integrally provided with the flexible circuit board 300, and the flexible circuit board 300 and the flexible sampling board 200 are electrically connected.

[0076] The flexible circuit board 300 is a kind of circuit board. Its main functions in the battery device 10 are: providing electrical connection for the battery cells 500 and each detection or control component, supporting signal transmission and current transfer; secondly, the flexible circuit board 300 has the advantages of reducing space occupation, improving the compactness and adaptability of the internal components of the battery device 10; enhancing the anti-seismic and anti-fatigue performance, improving the reliability of the battery device 10; optimizing thermal management, improving the heat dissipation effect; and integrating a battery management system to monitor the battery state, etc.

[0077] The flexible sampling board 200, which is also a type of circuit board. In this embodiment, the flexible sampling board 200 performs the function of collecting voltage, so it is called a sampling board. Taking the flexible voltage sampling board as an example, its function in the battery is to collect the voltages of each battery cell 500 and transmit the data to the battery management system (BMS) through the flexible circuit board 300. The battery management system (BMS) judges the state of the battery device 10 based on the voltages of each battery cell 500 returned by the flexible voltage sampling board, so that the battery can work within a safe range, improving the safety and performance of the battery.

[0078] In this embodiment, the flexible circuit board 300 and the flexible sampling board 200 are integrally arranged. That is to say, the flexible circuit board 300 and the flexible sampling board 200 are produced and manufactured as one circuit board. In this way, the number of connecting components between the flexible circuit board 300 and the flexible sampling board 200 can be reduced, and the risks of poor connection, unstable contact or mechanical damage can also be reduced, improving the overall reliability of the battery device 10.

[0079] According to some embodiments of the present application, referring to Figure 3 and further referring to Figure 4 and Figure 5 the number of the flexible sampling boards 200 is multiple, and each flexible sampling board 200 is connected to at least one bus bar 100; the multiple flexible sampling boards 200 are arranged on opposite sides of the flexible circuit board 300, and the multiple flexible sampling boards 200 are arranged at intervals along the length direction of the flexible sampling board 200.

[0080] Among them, the flexible circuit board 300 is generally arranged in a long strip shape, and the flexible circuit board 300 has opposite sides along its length direction, usually referring to the two long sides of the flexible circuit board 300.

[0081] In this embodiment, by arranging the multiple flexible sampling boards 200 at intervals along the length direction of the flexible circuit board 300 and connecting them to at least one bus bar 100, efficient voltage sampling of multiple battery cells 500 or battery modules can be achieved. In this way, a more reasonable layout and interval arrangement can be realized, optimizing the space utilization of the battery device 10 and improving the compactness of the overall structure of the battery device 10.

[0082] According to some embodiments of the present application, referring to Figure 3 and further referring to Figure 4 and Figure 5 the flexible circuit board 300 has opposite side edges along its length direction; among the two side edges of the flexible circuit board 300, at least one side edge is provided with an avoidance groove 301, and at least a part of the flexible sampling board 200 is arranged in the avoidance groove 301.

[0083] As shown in the previous embodiment, the flexible circuit board 300 is generally arranged in a long strip shape. The flexible circuit board 300 has opposite sides along its length direction, referring to the two long sides of the flexible circuit board 300; and refers to the edges of the two long sides. At least one side edge is provided with an avoidance groove 301, which includes that, among the two sides, one side is provided with the avoidance groove 301, or both sides are provided with the avoidance groove 301. The avoidance groove 301 is an open groove, and the opening faces the side where the bus bar 100 is located.

[0084] At least a part of the flexible sampling board 200 is arranged in the avoidance groove 301. That is to say, it can be that half of the flexible sampling board 200 is arranged in the avoidance groove 301 and half of the flexible sampling board 200 is arranged outside the avoidance groove 301. It can also be that two-thirds of the flexible sampling board 200 is arranged in the avoidance groove 301 and one-third of the flexible sampling board 200 is arranged outside the avoidance groove 301. It is also possible that the entire flexible sampling board 200 is arranged in the avoidance groove 301. The above three embodiments are to illustrate that at least a part of the flexible sampling board 200 is arranged in the avoidance groove 301. There are actually many other embodiments, and they will not be listed one by one here.

[0085] The technical solution of this embodiment sets the avoidance groove 301 at the side edge of the flexible circuit board 300, so that at least a part of the flexible sampling board 200 can be embedded in the avoidance groove 301. In this way, the width of the flexible sampling board 200 can be shortened, thereby realizing a more compact structural design.

[0086] According to some embodiments of the present application, with reference to Figure 3 and further with reference to Figure 4 and Figure 5 The flexible sampling board 200 includes a second connection part 210 and a sampling part 220 arranged on the second connection part 210. The second connection part 210 is connected to the flexible circuit board 300, and the sampling part 220 is connected to the first connection part 120 through atomic bonding; at least one of the second connection part 210 and the sampling part 220 is arranged in the avoidance groove 301.

[0087] Still taking voltage sampling as an example, the sampling part 220 is a connection point in the circuit for collecting voltage signals. It is usually connected to each voltage monitoring point of the battery or battery pack, and is used to transmit the voltage signal of the battery to the battery management system (BMS) or other monitoring systems. The function of the sampling part 220 is to measure the voltage of the battery cell 500 and provide real-time voltage data to help the system monitor the battery state.

[0088] In this embodiment, by arranging the second connection part 210 and / or the sampling part 220 in the avoidance groove 301, in some usage scenarios, it is possible to reduce space interference and conflicts and optimize the layout of the circuit board.

[0089] According to some embodiments of the present application, with reference to Figure 3 and further refer to Figure 4 and Figure 5 The avoidance groove 301 has side groove walls and a bottom groove wall that are connected to each other. One end of the second connecting portion 210 is connected to the flexible circuit board 300 at the side groove wall, and a part of the second connecting portion 210 protrudes toward the bottom groove wall.

[0090] Among them, the side groove wall refers to the side of the avoidance groove 301 that is close to or connected to the above-mentioned side edge, and the bottom groove wall refers to the side of the avoidance groove 301 that is opposite to its opening.

[0091] In this embodiment, a part of the second connecting portion 210 protrudes toward the bottom groove wall, which can effectively save space, make the layout of the flexible circuit board 300 more compact, and adapt to complex battery or device designs; a part of the second connecting portion 210 protrudes toward the bottom groove wall, that is to say, the flexible sampling board 200 is bent. The bent flexible sampling board 200 helps to reduce stress concentration on the circuit board, enhance seismic and shock resistance, and improve the stability and reliability of the flexible sampling board 200.

[0092] According to some embodiments of the present application, with reference to Figure 3 and further refer to Figure 4 and Figure 5 The sampling portion 220 has opposite third surfaces 221 and fourth surfaces 222, and the third surface 221 is in contact with the first surface 121; among them, at least the third surface 221 is a metal surface.

[0093] Among them, at least the third surface 221 being a metal surface can mean that the third surface 221 is a metal surface, or that both the third surface 221 and the fourth surface 222 are metal surfaces.

[0094] In this embodiment, the third surface 221 is the contact surface with the bus bar 100. That is to say, the contact surface where the sampling portion 220 is connected to the bus bar 100 is a metal surface, which can reduce the contact resistance and improve the stability and accuracy of sampling signal transmission; in addition, only setting the metal surface on the contact surface with the bus bar 100 can reduce the material cost and simplify the design at the same time; in addition, by only setting the metal surface on the contact surface, other electrical interferences can be reduced.

[0095] According to some embodiments of the present application, with reference to Figure 3 and further refer to Figure 4 and Figure 5, the number of the busbars 100 is multiple. The multiple busbars 100 are divided into at least two busbars along a first direction, and the busbars 100 within the busbars are arranged at intervals along a second direction; a flexible circuit board 300 is provided between two adjacent busbars, and the flexible circuit board 300 extends along the second direction; the first direction and the second direction intersect.

[0096] Exemplarily, as shown in Figure 3 , the first direction is the Y-axis direction, and the second direction is the X-axis direction. Of course, the first direction and the second direction can also be other directions.

[0097] After assembly, the second direction can be parallel or approximately parallel to the length direction of the flexible circuit board 300. In this way, the busbars can be parallel or approximately parallel to the flexible circuit board 300, so that the gap between the busbars can be reduced, the layout of the busbars 100 and the flexible circuit board 300 at this place is optimized, and the space utilization rate is improved.

[0098] In the technical solution of this embodiment, by dividing the multiple busbars 100 into busbars and arranging the flexible circuit board 300 between adjacent busbars, the layout of the busbars 100 and the flexible circuit board 300 can be optimized, and the space utilization rate is improved.

[0099] According to some embodiments of the present application, referring to Figure 4 , and further referring to Figure 3 and Figure 5 , the battery device 10 further includes a carrier 400, and the carrier 400 is disposed between the busbar 100 and the battery cell 500. The carrier 400 is used to carry the flexible sampling board 200, the flexible circuit board 300 and the busbar 100.

[0100] The carrier 400 can be used to provide a mounting position for mounting the busbar 100, the flexible sampling board 200, the flexible circuit board 300, etc., so that the busbar 100, the flexible sampling board 200 and the flexible circuit board 300 can be assembled into a whole. In addition, the carrier 400 can also be used to play an isolation role. That is, when a battery cell 500 is provided on one side of the carrier 400, the busbar 100 can be provided on the surface of the other side of the carrier 400, so as to play an isolation role between the busbar 100 and the battery cell 500.

[0101] Among them, the carrier 400 can be a plate structure, so that its structure is relatively simple and its volume is relatively small, which is conducive to improving the convenience of processing and forming it and reducing the manufacturing cost. The shape of the carrier 400 can be rectangular, rectangular, or circular, etc., so that the shape of the carrier 400 is relatively regular, and further improve the convenience of processing and forming it. In addition, the material of the carrier 400 can be plastic, so that it has a good insulation effect on the battery cell 500, the bus bar 100, etc. In addition, the bus bar 100 can be installed and fixed on the carrier 400 by welding with the electrode post in the battery cell 500 as introduced below, or can be directly fixed on the carrier 400, and can be electrically connected to at least two battery cells 500 at the same time.

[0102] In this embodiment, by providing the carrier 400, on the one hand, it is convenient to carry and install the bus bar 100, the flexible sampling board 200, the flexible circuit board 300, etc. On the other hand, the carrier 400 can play an insulating and isolating role between the battery cell 500, the flexible sampling board 200, the flexible circuit board 300, etc., so as to reduce the possibility of battery short circuit.

[0103] According to some embodiments of the present application, refer to Figure 3 , and please further refer to Figures 4 to 6, the battery device 10 includes at least two battery cells 500, a bus bar 100, a flexible sampling board 200, a flexible circuit board 300, and a carrier 400; the bus bar 100 is connected to at least two battery cells 500 and enables electrical connection between the connected battery cells 500; the flexible sampling board 200 is connected to the bus bar 100 by atomic bonding to be electrically connected to the bus bar 100; the flexible sampling board 200 is a voltage sampling board; the bus bar 100 and the flexible sampling board 200 are connected by atomic bonding through electromagnetic pulse welding; further, the bus bar 100 includes a bus bar body 110 and a first connection portion 120, and the first connection portion 120 is provided at the periphery of the bus bar body 110; the bus bar body 110 is connected to at least two battery cells 500 and enables electrical connection between the connected battery cells 500; the first connection portion 120 is connected to the flexible sampling board 200 by atomic bonding; the first connection portion 120 has opposite first and second surfaces 121 and 122, the first surface 121 is attached to the flexible sampling board 200, and the first connection portion 120 is provided with a groove at the second surface 122; further, the flexible sampling board 200 and the flexible circuit board 300 are integrally provided, and the flexible circuit board 300 and the flexible sampling board 200 are electrically connected; the number of flexible sampling boards 200 is multiple, and each flexible sampling board 200 is connected to at least one bus bar 100; the multiple flexible sampling boards 200 are provided on opposite sides of the flexible circuit board 300, and the multiple flexible sampling boards 200 are arranged at intervals along the length direction of the flexible sampling board 200; further, the flexible circuit board 300 has opposite side edges along its length direction; at least one of the side edges of the flexible circuit board 300 is provided with an avoidance groove 301, and at least a part of the flexible sampling board 200 is provided in the avoidance groove 301; the flexible sampling board 200 includes a second connection portion 210 and a sampling portion 220 provided on the second connection portion 210, the second connection portion 210 is connected to the flexible circuit board 300, and the sampling portion 220 is connected to the first connection portion 120 by atomic bonding; at least one of the second connection portion 210 and the sampling portion 220 is provided in the avoidance groove 301; the avoidance groove 301 has mutually connected side groove walls and a bottom groove wall, one end of the second connection portion 210 is connected to the flexible circuit board 300 at the side groove wall, and a part of the second connection portion 210 protrudes towards the bottom groove wall; further, the sampling portion 220 has opposite third and fourth surfaces 221 and 222, and the third surface 221 is in contact with the first surface 121; wherein, at least the third surface 221 is a metal surface; the number of bus bars 100 is multiple, and the multiple bus bars 100 are divided into at least two bus bar rows along a first direction, and the bus bars 100 in the bus bar row are arranged at intervals along a second direction; a flexible circuit board 300 is provided between adjacent two bus bar rows, and the flexible circuit board 300 extends along the second direction; the first direction and the second direction intersect;Furthermore, the battery device 10 further includes a carrier 400 disposed between the bus bar 100 and the battery cell 500. The carrier 400 is used to carry the flexible sampling board 200, the flexible circuit board 300, and the bus bar 100.

[0104] The present application also proposes a battery sampling assembly 11. According to some embodiments of the present application, with reference to Figure 3 , and further with reference to Figure 4 and Figure 5 , the battery sampling assembly 11 includes a bus bar 100 and a flexible sampling board 200. The bus bar 100 is used for electrically connecting the battery cells 500. The flexible sampling board 200 is connected to the bus bar 100 by atomic bonding to be electrically connected to the bus bar 100.

[0105] The technical effect of this solution is the same as that of the solution in the first embodiment. Additionally, in this embodiment, it is considered that in the actual application process, usually the bus bar 100 and the flexible sampling board 200 are first connected, and then they are assembled and connected to the battery cells 500 in another process or section.

[0106] Moreover, with this arrangement of the present solution, by first completing the connection of the bus bar 100 and the flexible sampling board 200, the assembly and debugging of the circuit board part can be independently completed, reducing the complex operations and adjustments when the circuit board is connected to the battery cells 500, thereby accelerating the overall production progress.

[0107] Furthermore, the battery sampling assembly 11 further includes a carrier 400, and the flexible sampling board 200 and the bus bar 100 are disposed on the carrier 400.

[0108] The structure of the carrier 400 can refer to the foregoing embodiments and will not be elaborated herein. In this embodiment, the carrier 400 provides a support platform, enabling the flexible sampling board 200 and the bus bar 100 to be stably fixed, reducing the loosening or displacement of the components caused by external forces or vibrations; providing a basis for the subsequent stable connection between the battery sampling assembly 11 and the battery cells 500.

[0109] The present application also proposes an electrical device. The electrical device includes the battery device 10. The specific structure of the battery device 10 refers to the above embodiments. Since this electrical device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments and will not be elaborated herein one by one. Among them, the battery device 10 is used to provide electrical energy, and the electrical device can be an electric vehicle, an electric motorcycle, an electric bicycle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: At least two battery cells; A bus bar connecting at least two of the battery cells and enabling electrical connection between the connected battery cells; And A flexible sampling board connected to the bus bar by electromagnetic pulse welding for electrical connection to the bus bar; The bus bar includes a bus bar body and a first connection portion provided at the periphery of the bus bar body; the bus bar body connects at least two of the battery cells and enables electrical connection between the connected battery cells; the first connection portion is connected to the flexible sampling board by electromagnetic pulse welding; The first connection portion has opposite first and second surfaces, the first surface being attached to the flexible sampling board, and the first connection portion having a groove provided at the second surface.

2. The battery device according to claim 1, wherein, The battery device includes a flexible circuit board, the flexible sampling board being integrally provided with the flexible circuit board, and the flexible circuit board and the flexible sampling board being electrically connected.

3. The battery device according to claim 2, wherein The number of the flexible sampling boards is multiple, and each flexible sampling board is connected to at least one of the bus bars; The multiple flexible sampling boards are provided on opposite sides of the flexible circuit board, and the multiple flexible sampling boards are spaced apart along the length direction of the flexible sampling board.

4. The battery device according to claim 3, wherein The flexible circuit board has opposite side edges along its length direction; Among the two side edges of the flexible circuit board, at least one side edge is provided with an avoidance groove, and at least a part of the flexible sampling board is provided in the avoidance groove.

5. The battery device according to claim 4, wherein, The flexible sampling board includes a second connection portion and a sampling portion provided on the second connection portion, the second connection portion being connected to the flexible circuit board, and the sampling portion being connected to the first connection portion by electromagnetic pulse welding; at least one of the second connection portion and the sampling portion is provided in the avoidance groove.

6. The battery device according to claim 5, characterized in that The avoidance groove has side groove walls and a bottom groove wall connected to each other, one end of the second connection portion being connected to the flexible circuit board at the side groove wall, and a part of the second connection portion protruding towards the bottom groove wall.

7. The battery device according to claim 6, characterized in that, The sampling portion has opposite third and fourth surfaces, the third surface being in contact with the first surface; Wherein, at least the third surface is a metal surface.

8. The battery device according to claim 7, wherein, The number of the bus bars is multiple, and the multiple bus bars are divided into at least two bus bar rows along a first direction, and the bus bars in the bus bar row are spaced apart along a second direction; A flexible circuit board is provided between two adjacent bus bar rows, the flexible circuit board extending along the second direction; the first direction and the second direction intersect.

9. The battery device according to any one of claims 2 to 8, characterized in that, The battery device further includes a carrier provided between the bus bar and the battery cell, the carrier being used for carrying the flexible sampling board, the flexible circuit board, and the bus bar.

10. The battery device according to any one of claims 1 to 8, characterized in that, The flexible sampling board is a voltage sampling board.

11. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 10, the battery device being used for providing electrical energy.

12. A battery sampling component, characterized in that, Comprising: A bus bar for electrically connecting battery cells; And A flexible sampling board connected to the bus bar by electromagnetic pulse welding for electrical connection to the bus bar; The bus bar includes a bus bar body and a first connection part, and the first connection part is arranged at the periphery of the bus bar body; the bus bar body is connected to at least two of the battery cells, and electrical connection can be realized between the connected battery cells; the first connection part and the flexible sampling board are connected by electromagnetic pulse welding; The first connection part has an opposite first surface and a second surface, the first surface is attached to the flexible sampling board, and the first connection part is provided with a groove at the second surface.

13. The battery sampling component according to claim 12, characterized in that, The battery sampling assembly further includes a carrier, and the flexible sampling board and the bus bar are arranged on the carrier.

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