Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises a battery monomer and an integrated busbar. The battery monomer comprises an electrode terminal; the integrated busbar comprises a flexible circuit board and a busbar, the busbar comprises a first part and a second part connected with the first part, the first part and the flexible circuit board are overlapped and electrically connected, and the second part is electrically connected with the electrode terminal. In the technical scheme of the embodiment of the invention, compared with the busbar which is not overlapped with the flexible circuit board, the overcurrent capability of the busbar is improved by increasing the sectional area of the busbar on the basis of not changing the space occupied by the integrated busbar.

Description

Technical Field

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

[0002] The Cell Contact System (CCS) is a crucial component for connecting individual battery cells and is crucial to the production and processing of battery devices. The CCS primarily consists of signal acquisition components (FPC, PCB, FFC, etc.) and copper and aluminum busbars, connected together through processes such as thermal compression or riveting. The CCS is an integral component of the BMS, providing temperature and voltage information to the battery management system (BMS) via the FPC / PCB and connector components.

[0003] As the requirements for battery device capacity and fast charging continue to increase, the requirements for the overcurrent capacity of integrated busbars are also getting higher and higher. However, the overcurrent capacity of current integrated busbars is difficult to meet the demand, so an integrated busbar with strong overcurrent capacity is needed. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can alleviate the problem of poor overcurrent capacity of the integrated busbar of the battery device.

[0005] In a first aspect, the present application provides a battery device comprising a battery cell and an integrated busbar. The battery cell includes an electrode terminal; the integrated busbar includes a flexible circuit board and a busbar. The busbar includes a first portion and a second portion connected to the first portion, the first portion overlapping the flexible circuit board, and the second portion connected to the electrode terminal.

[0006] In the technical solution of the embodiment of the present application, compared with the bus that does not overlap with the flexible circuit board, this solution increases the cross-sectional area of ​​the bus by setting a first part overlapping with the flexible circuit board on the bus without changing the space occupied by the integrated bus, thereby improving the current carrying capacity of the bus.

[0007] In some embodiments, a recess is provided in any surface of the first portion along its thickness direction, and there is a height difference between the bottom surface of the recess and the surface of the second portion, and the portion of the flexible circuit board corresponding to the recess is accommodated in the recess.

[0008] This arrangement allows for selective placement of recesses along one of the first portion's thickness surfaces, depending on actual needs. This increases flexibility in the placement of the recesses, allowing the busbar to mate with flexible circuit boards located at different locations within the battery cell. Furthermore, the recesses and the second portion can be used to position the flexible circuit board, improving its installation stability.

[0009] In some embodiments, a height difference between a bottom surface of the recess and a surface of the second portion is L, and 0.2 mm ≤ L ≤ 0.6 mm.

[0010] The above arrangement can position the flexible circuit board by utilizing the recess and the second portion while minimizing the increase in the size of the integrated busbar itself, thereby improving the installation stability of the flexible circuit board.

[0011] In some embodiments, a surface of the flexible circuit board facing away from the first portion is flush with a surface of the second portion.

[0012] In this way, after the integrated busbar is assembled, the upper surface of the integrated busbar can be in a relatively flat state, which facilitates the subsequent installation of other components of the battery device and reduces the space occupied by the integrated busbar.

[0013] In some embodiments, the battery cells include at least two, at least some of the battery cells are arranged in sequence along a first direction, the flexible circuit board is arranged above the battery cells and itself extends along the first direction, the first part and the second part of the bus are arranged along the second direction, and the first direction intersects with the second direction; wherein the first part is stacked on the flexible circuit board along the second direction, and the second part connects the electrode terminals of two battery cells arranged adjacent to each other along the first direction.

[0014] Because the first portion is connected to one end of the second portion along the second direction, the assembly of the flexible printed circuit board onto the first portion improves the compactness of the components, enabling the integration of an integrated motherboard. Furthermore, adjacent battery cells are connected in series via the busbar, increasing the total voltage capacity of the battery assembly and enabling it to handle high voltages.

[0015] In some embodiments, the second portion includes a first subsection and a second subsection sequentially connected along the first direction, and the electrode terminal of one of two adjacent battery cells along the first direction is connected to the first subsection, and the electrode terminal of the other battery cell is connected to the second subsection.

[0016] In this way, by providing the first sub-part and the second sub-part to connect with the electrode terminals of the corresponding battery cells, it is convenient to connect the busbar and the electrode terminals of different battery cells together, thereby reducing the difficulty of installation.

[0017] In some embodiments, the busbars include at least two groups, and the two groups of busbars are spaced apart and distributed on both sides of the same flexible printed circuit board along the second direction.

[0018] With this arrangement, by connecting two groups of busbars to a flexible circuit board, and by increasing the cross-sectional area of ​​a single busbar connected to a flexible circuit board, the cross-sectional area of ​​all busbars connected to the flexible circuit board can be increased, thereby improving the current carrying capacity of the integrated busbar.

[0019] In some embodiments, the integrated busbar further includes an external connector, which is disposed in two groups of busbars on both sides of the same flexible circuit board, wherein the head end of one group of busbars is provided with an external connector, which is electrically connected between the battery cell and the external component.

[0020] During assembly of the integrated busbar, the busbars on either side of the flexible printed circuit board are staggered along a first direction. Along the first direction, the electrode terminal of a battery cell at the front end is connected to an external connector, while the remaining electrode terminals are electrically connected to the second portion of the busbar. The assembled integrated busbar is then connected to the corresponding components via the external connector, thereby improving the installation stability of the integrated busbar.

[0021] In some embodiments, the battery device further includes a temperature collection element connected to the flexible circuit board, the temperature collection element being used to collect temperature information of the battery cell;

[0022] The busbars include at least two, and the temperature collection element is limitedly matched with a side of one of the busbars facing the battery cell.

[0023] When in operation, the temperature acquisition element can be used to collect the temperature of the end cap of the battery cell and transmit the collected data to the BMS to trigger the protection mechanism (such as reducing the current and cutting off the circuit), reducing the risk of thermal runaway and improving the safety of the battery device.

[0024] In some embodiments, the battery device also includes a bracket, the temperature collection element is arranged in the bracket, and the bus that is limitedly matched with the temperature collection element includes a limiting portion connected to the second part, and the limiting portion is crimped to the surface of the bracket along the thickness direction of the flexible circuit board.

[0025] A retaining member on the busbar, used to mount the bracket, secures the temperature acquisition element in place along the thickness of the flexible circuit board. This enhances the busbar's functionality and eliminates the need for additional components outside the busbar to mount the temperature acquisition element. Furthermore, compared to directly mounting the temperature acquisition element, mounting it via the bracket reduces the risk of damage and further protects it. Furthermore, because the temperature acquisition element can be positioned along the thickness of the flexible circuit board, the likelihood of movement during use, which could lead to inaccurate data collected by the element, is reduced, thereby improving the accuracy of the collected data.

[0026] In some embodiments, the limiting portion and the first portion are disposed on the same side of the second portion, and the limiting portion is protruded relative to the second portion to form a receiving groove.

[0027] When the bracket is installed in the receiving slot, the second portion can limit the bracket in the second direction, while the limiting portion limits the bracket in the thickness direction of the flexible circuit board. This allows the bracket to be limited in multiple directions, improving the installation stability of the bracket and thus the installation stability of the temperature collection element.

[0028] In some embodiments, a through hole is provided on the limiting portion, and the through hole is arranged opposite to the temperature collecting element.

[0029] Because the limiting portion and the bracket can jointly fix the temperature collection element, a through hole is provided on the limiting portion to avoid the temperature collection element, thereby reducing the probability of the temperature collection element being damaged due to excessive pressure.

[0030] In some embodiments, the integrated busbar further includes a first insulating member, the first insulating member supports the flexible printed circuit board and the busbar, and the bracket is limited between the first insulating member and the limiting portion of the busbar.

[0031] Such an arrangement further improves the installation stability of the bracket, thereby improving the integration level of the integrated busbar.

[0032] In some embodiments, a blocking portion is protruded from the first insulating member, and the blocking portion is located between two adjacent first portions to provide blocking in the second direction.

[0033] When the busbar is installed on the first insulating member, in the second direction, the first parts of two adjacent busbars are arranged opposite to each other, and the two oppositely arranged first parts are located on both sides of the blocking part to be electrically isolated by the blocking part, thereby reducing the probability of direct contact between the two adjacent busbars in the second direction, thereby causing a short circuit.

[0034] In some embodiments, the battery device further includes a second insulating member disposed between the first portion and the flexible circuit board.

[0035] This arrangement insulates the unconnected areas between the busbar and the flexible printed circuit board via a second insulating member, reducing the risk of short circuits caused by direct contact between the flexible printed circuit board and the busbar, preventing equipment damage or safety hazards caused by abnormal current flow, and providing electrical isolation. Furthermore, by blocking current leakage paths, the accuracy of signal acquisition is guaranteed.

[0036] In a second aspect, the present application provides an electrical device comprising the battery device in the above embodiment.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0039] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0040] Figure 2 FIG. 4 is an exploded view of a battery device according to one or more embodiments.

[0041] Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0042] Figure 4 FIG. 1 is an exploded view of a battery device according to one or more embodiments, with some structures hidden. FIG.

[0043] Figure 5 Schematic diagram of the structure of an integrated busbar of a battery device according to one or more embodiments.

[0044] Figure 6 FIG. 1 is an exploded view of an integrated busbar of a battery device according to one or more embodiments.

[0045] Figure 7 Schematic diagram of a structure in which a busbar is not provided with a limiting portion according to one or more embodiments.

[0046] Figure 8 It is a schematic diagram of the partial structure of an integrated busbar according to one or more embodiments.

[0047] Figure 9 It is a structural schematic diagram of a busbar provided with a limiting portion according to one or more embodiments.

[0048] Figure 10 It is a schematic diagram of the partial structure of the integrated busbar mechanism according to one or more embodiments.

[0049] The accompanying drawings in the specific implementation manner are as follows:

[0050] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 11, first component; 12, second component; 20, battery cell; 21, end cap; 21a, electrode terminal; 22, housing; 23, electrode assembly; 30, integrated busbar; 31, flexible circuit board; 32, busbar; 321, first part; 322, second part; 3221, first sub-part; 3222, second sub-part; 323, limiting part; 3231, through hole; 33, first insulating member; 34, second insulating member; 35, observation hole; 40, temperature collection element; 50, bracket; 60, external component; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of this application, the use of technical terms such as "first" and "second" is solely for distinguishing different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0054] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of this application, the term "and / or" is used to describe an association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document, when it appears, generally indicates that the associated objects are in an "or" relationship.

[0056] In the description of the embodiments of the present application, if it appears, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, if any, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0059] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As power battery applications continue to expand, market demand is also growing.

[0060] As new energy vehicles have high requirements for battery capacity and fast charging, that is, the ability to carry high voltage and high current, steel strips or composite pressure plates are generally installed on the electrode assemblies to improve the integrity of the battery device. However, this will result in a compact busbar layout space, making it difficult for the integrated busbar to meet the overcurrent requirements.

[0061] Based on the above considerations, and to address the issue of poor current handling capacity of integrated busbars, some embodiments of the present application provide a battery device in which the integrated busbar comprises a flexible circuit board and a busbar, which in turn comprises a first portion and a second portion. Because the first portion and the flexible circuit board overlap, the cross-sectional area of ​​the busbar is increased while maintaining the space required for the busbar itself, thereby improving the busbar's current handling capacity.

[0062] The battery device disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0063] The embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, an energy storage product, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the energy storage product may include an energy storage station, etc.

[0064] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0065] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0066] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0067] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first component 11 and a second component 12, which overlap each other and together define a storage space for the battery cell 20. The second component 12 can be a hollow structure with one end open. The first component 11 can be a plate-like structure, with the first component 11 overlapping the open side of the second component 12, so that the first component 11 and the second component 12 jointly define a storage space. The first component 11 and the second component 12 can also be hollow structures with one end open, with the open side of the first component 11 overlapping the open side of the second component 12. Of course, the housing 10 formed by the first component 11 and the second component 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0068] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0069] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0070] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a shell 22, an electrode assembly 23 and other functional components.

[0071] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. The end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation of the end cap 21 under compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0072] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0073] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0074] See also Figures 4 to 6 Some embodiments of the present application provide a battery device 100 including a battery cell 20 and an integrated busbar 30. The battery cell 20 includes an electrode terminal 21a. The integrated busbar 30 includes a flexible printed circuit board 31 and a busbar 32. The busbar 32 includes a first portion 321 and a second portion 322 connected to the first portion 321. The first portion 321 overlaps with and is electrically connected to the flexible printed circuit board 31, and the second portion 322 is electrically connected to the electrode terminal 21a.

[0075] The electrode terminals 21 a are used to output or input electrical energy from the battery cell 20 .

[0076] The integrated busbar 30 can play the following roles, such as high-voltage series and parallel connection of battery cells 20, temperature and voltage sampling, overcurrent protection, signal transmission, structural compactness, and lightweighting.

[0077] The busbar 32 can be made of a metal material such as copper or aluminum. It is used to connect to the electrode terminals 21a of the battery cells 20. For example, the busbar 32 connects to the positive and negative electrodes of the battery cells 20. The flexible printed circuit board 31 stands for Flexible Printed Circuit (FPC). It functions as a means of transmitting and distributing current and transmitting signals.

[0078] The following describes the process in conjunction with a specific embodiment.

[0079] During assembly of the battery device 100, the integrated busbar 30 can be installed above the battery cell 20, with the first portion 321 of the busbar 32 positioned between the battery cell 20 and the flexible circuit board 31, and the second portion 322 of the busbar 32 connected to the electrode terminal 21a of the battery cell 20. In other words, along the thickness direction of the integrated busbar 30, the first portion 321 and the flexible circuit board 31 overlap.

[0080] In this way, relative to the busbar 32 that does not overlap with the flexible circuit board 31, this solution increases the cross-sectional area of ​​the busbar 32 and improves the current carrying capacity of the busbar 32 by setting a first part 321 on the busbar 32 that overlaps with the flexible circuit board 31 without changing the space occupied by the integrated busbar 30.

[0081] In some embodiments, a recess is provided in any surface of the first portion 321 along its thickness direction, and there is a height difference between the bottom surface of the recess and the surface of the second portion 322 , and the portion of the flexible circuit board 31 corresponding to the recess is accommodated in the recess.

[0082] For example, in one embodiment, a recess is provided in the surface of the first portion 321 facing the battery cell 20, and a portion of the flexible circuit board 31 is housed within the recess. Because there is a height difference between the recess and the surface of the second portion 322, a portion of the flexible circuit board 31 can be located within the recess. This reduces the thickness of the busbar 32 and flexible circuit board 31 when assembled together, compared to a case without the recess.

[0083] In another example, the above-mentioned recess may be provided in the surface of the first portion 321 facing away from the battery cell 20 , as long as part of the flexible circuit board 31 can be accommodated in the recess. This is not limited here.

[0084] In summary, a recess can be selectively provided on one of the surfaces of the first portion 321 along its thickness direction, depending on actual needs. This increases the flexibility of the recess's placement, allowing the busbar 32 to mate with the flexible circuit board 31 at different locations within the battery cell 20. Furthermore, the recess and the second portion 322 can jointly limit the position of the flexible circuit board 31, improving the installation stability of the flexible circuit board 31.

[0085] Specifically, in some embodiments, the height difference between the bottom surface of the recess and the surface of the second portion 322 is L, 0.2 mm ≤ L ≤ 0.6 mm. The value of L can be 0.2 mm, 0.36 mm, 0.4 mm, 0.6 mm, or any value between two adjacent values.

[0086] For example, in this embodiment, the depth of the recess is 0.36 mm, which is equal to the thickness of the flexible circuit board 31 and can just accommodate the flexible circuit board 31 .

[0087] The above arrangement can position the flexible circuit board 31 by utilizing the recess and the second portion 322 while minimizing the increase in the size of the integrated busbar 30 itself, thereby improving the installation stability of the flexible circuit board 31 .

[0088] Furthermore, in some embodiments, the surface of the flexible circuit board 31 facing away from the first portion 321 is flush with the surface of the second portion 322 .

[0089] In this way, after the integrated busbar 30 is assembled, the upper surface of the integrated busbar 30 can be in a relatively flat state, which facilitates the subsequent installation of other components of the battery device 100 and reduces the space occupied by the integrated busbar 30.

[0090] like Figure 4 and Figure 5 As shown, in some embodiments, the battery cells 20 include at least two, at least some of the battery cells 20 are arranged sequentially along a first direction X, the flexible circuit board 31 is disposed above the battery cells 20 and extends along the first direction X, the first portion 321 and the second portion 322 of the busbar 32 are arranged along a second direction Y, and the first direction X intersects the second direction Y;

[0091] The first portion 321 is stacked on the flexible circuit board 31 along the second direction Y, and the second portion 322 is connected to the electrode terminals 21 a of two battery cells 20 adjacently arranged along the first direction X.

[0092] For example, there are multiple battery cells 20, which can be arranged sequentially along the first direction X. A busbar 32 is connected between two adjacent battery cells 20. The second portion 322 of the busbar 32 can be connected to the corresponding electrode terminals 21a of two battery cells 20 at the same time.

[0093] Because the first portion 321 is connected to one end of the second portion 322 along the second direction Y, the assembly of the flexible printed circuit board 31 onto the first portion 321 improves the compactness of the components and achieves an integrated motherboard. Furthermore, adjacent battery cells 20 are connected in series via the busbar 32, increasing the total voltage capacity of the battery device 100 and enabling it to handle high voltages.

[0094] like Figure 7 As shown, in some embodiments, the second portion 322 includes a first sub-portion 3221 and a second sub-portion 3222 connected in sequence along the first direction X, and the electrode terminal 21a of one of the two adjacent battery cells 20 along the first direction X is connected to the first sub-portion 3221, and the electrode terminal 21a of the other is connected to the second sub-portion 3222.

[0095] For example, multiple battery cells 20 are distributed along the first direction X. A busbar 32 is provided between two adjacent battery cells 20 to connect the first sub-portion 3221 to the electrode terminal 21a of one of the battery cells 20 and the second sub-portion 3222 to the electrode terminal 21a of the other battery cell 20 .

[0096] In this way, by providing the first sub-portion 3221 and the second sub-portion 3222 to connect with the electrode terminals 21 a of the corresponding battery cells 20 , it is convenient to connect the busbar 32 and the electrode terminals 21 a of different battery cells 20 together, thereby reducing the difficulty of installation.

[0097] like Figure 6 As shown, in some embodiments, the busbars 32 include at least two groups, and the two groups of busbars 32 are spaced apart and distributed along the second direction Y on both sides of the same flexible circuit board 31 .

[0098] Illustratively, two groups of busbars 32 are provided along the second direction Y. Each group of busbars 32 is disposed opposite to the electrode terminal 21 a on one side of the battery cell 20 . The first portions 321 of each group of busbars 32 are disposed opposite to each other and jointly support the flexible circuit board 31 .

[0099] In this arrangement, by connecting two groups of busbars 32 to a flexible circuit board 31, and by increasing the cross-sectional area of ​​the connection between a single busbar 32 and a flexible circuit board 31, the cross-sectional area of ​​the connection between all busbars 32 and the flexible circuit board 31 can be increased, thereby improving the current carrying capacity of the integrated busbar 30.

[0100] like Figure 6 As shown, in some embodiments, the integrated busbar 30 also includes an external component 60, which is arranged in two groups of busbars 32 on both sides of the same flexible circuit board 31, and the head end of one group of busbars 32 is provided with an external component 60, and the external component 60 is electrically connected between the battery cell 20 and the external component.

[0101] When assembling the integrated busbar 30, the sets of busbars 32 on either side of the flexible circuit board 31 are staggered along a first direction X. Along the first direction X, the electrode terminal 21a of one of the battery cells 20 at the head end is connected to the external connector 60, while the remaining electrode terminals 21a are electrically connected to the second portion 322 of the busbar 32. The external connector 60 connects the assembled integrated busbar 30 to the corresponding components, thereby improving the installation stability of the integrated busbar 30.

[0102] like Figure 8 As shown, in some embodiments, the battery device 100 further includes a temperature collection element 40 connected to the flexible circuit board 31, and the temperature collection element 40 is used to collect temperature information of the battery cell 20; the busbars 32 include at least two, and the temperature collection element 40 is limitedly engaged with one of the busbars 32 toward one side of the battery cell 20.

[0103] The temperature collection element 40 may be, but is not limited to, a positive temperature coefficient thermistor (PTC), a negative temperature coefficient thermistor (NTC), a thermocouple, a resistance temperature detector, and the like.

[0104] When there are multiple busbars 32, the temperature collecting element 40 may be disposed on one of the busbars 32. The connection between the temperature collecting element 40 and the busbar 32 may be, but is not limited to, bonding or clamping.

[0105] When in operation, the temperature collection element 40 can be used to collect the temperature of the end cap 21 of the battery cell 20 and transmit the collected data to the BMS to trigger a protection mechanism (such as reducing current, cutting off the circuit), reducing the risk of thermal runaway, and improving the safety of the battery device 100.

[0106] It should be noted that, according to actual needs, temperature collection elements 40 may be provided on some of the busbars 32 to collect the temperatures of different parts of the end cover 21 , so as to improve the accuracy of the collected data.

[0107] Please continue reading Figure 8 and Figure 9 In some embodiments, the battery device 100 further includes a bracket 50, the temperature collection element 40 is disposed in the bracket 50, and the bus 32 that is limitedly engaged with the temperature collection element 40 includes a limiting portion 323 connected to the second portion 322, and the limiting portion 323 is pressed against the surface of the bracket 50 along the thickness direction of the flexible circuit board 31.

[0108] When assembling the temperature collecting element 40 , it can be installed in the bracket 50 , and then the bracket 50 can be fixed in the thickness direction of the flexible circuit board 31 by the limiting portion 323 , thereby fixing the temperature collecting element 40 .

[0109] The positioning portion 323 provided on the busbar 32 for mounting the bracket 50 secures the temperature acquisition element 40 in the thickness direction of the flexible circuit board 31. This enhances the functionality of the busbar 32 and eliminates the need for additional components outside the busbar 32 to mount the temperature acquisition element 40. Furthermore, compared to directly mounting the temperature acquisition element 40, mounting the temperature acquisition element 40 via the bracket 50 reduces the likelihood of damage to the element 40, further protecting it. Furthermore, because the temperature acquisition element 40 can be positioned in the thickness direction of the flexible circuit board 31, the likelihood of movement during use, which could lead to inaccurate data collected by the element 40, is reduced, thereby improving the accuracy of the collected data.

[0110] Furthermore, in some embodiments, the limiting portion 323 and the first portion 321 are disposed on the same side of the second portion 322 , and the limiting portion 323 is protruded relative to the second portion 322 to form a receiving groove.

[0111] When the bracket 50 is installed in the receiving groove, the second portion 322 can limit the bracket 50 in the second direction Y, while the limiting portion 323 limits the bracket 50 in the thickness direction of the flexible circuit board 31. This allows the bracket 50 to be limited in multiple directions, improving the installation stability of the bracket 50 and, consequently, the installation stability of the temperature sensing element 40.

[0112] Furthermore, if Figure 9 As shown, a through hole 3231 is provided on the limiting portion 323 , and the through hole 3231 is arranged opposite to the temperature collecting element 40 .

[0113] Because the limiting portion 323 and the bracket 50 can jointly fix the temperature collecting element 40 , a through hole 3231 is provided on the limiting portion 323 to allow the temperature collecting element 40 to pass through, thereby reducing the probability of the temperature collecting element 40 being damaged due to excessive pressure.

[0114] like Figure 6 As shown, in some embodiments, the integrated busbar 30 further includes a first insulating member 33 , which supports the flexible circuit board 31 and the busbar 32 , and the bracket 50 is limited between the first insulating member 33 and the limiting portion 323 of the busbar 32 .

[0115] The first insulating member 33 supports components such as the flexible printed circuit board 31 and busbar 32. It can be made of materials such as terephthalic acid and polyethylene terephthalate (PET). PET is a thermoplastic resin material with high transparency, glossiness, rigidity, insulation, and toughness. The surface of the first insulating member 33 supporting the flexible printed circuit board 31 and busbar 32 is provided with an adhesive layer to ensure optimal mounting of these components.

[0116] It should be noted that the first insulating member 33 has an opening that allows access to the temperature collection element 40. When assembling the integrated busbar 30, the temperature collection element 40 is mounted on the bracket 50, aligned with the opening in the first insulating member 33, to directly collect the temperature of the end caps 21 of the battery cells 20. The busbar 32 is then mounted on the first insulating member 33, pressing the bracket 50 between the stopper 323 and the first insulating member 33 to secure it.

[0117] Such an arrangement further improves the installation stability of the bracket 50 , thereby improving the integration level of the integrated busbar 30 .

[0118] In some embodiments, a blocking portion (not shown) is protruded from the first insulating member 33 , and the blocking portion is located between two adjacent first portions 321 to provide isolation in the second direction Y.

[0119] The blocking portion can be made of insulating material, and can be made in one piece with the first insulating member 33 using a molding process.

[0120] When the busbar 32 is installed on the first insulating member 33, in the second direction Y, the first parts 321 of two adjacent busbars 32 are arranged opposite to each other, and the two oppositely arranged first parts 321 are located on both sides of the blocking portion to be electrically isolated by the blocking portion, thereby reducing the probability of direct contact between the two adjacent busbars 32 in the second direction Y, thereby causing a short circuit.

[0121] It is understandable that in some embodiments, the blocking portion is not provided on the first insulating member 33 , and instead the distance between the first portions 321 corresponding to two adjacent busbars 32 in the second direction Y is controlled to meet electrical isolation requirements.

[0122] See also Figure 6 In some embodiments, the battery device 100 further includes a second insulating member 34 , which is disposed between the first portion 321 and the flexible circuit board 31 .

[0123] The second insulating member 34 can also be made of insulating materials such as terephthalic acid and polyethylene terephthalate (PET). The second insulating member 34 insulates the unconnected portion between the busbar 32 and the flexible printed circuit board 31, thereby reducing the risk of short circuits caused by direct contact between the flexible printed circuit board 31 and the busbar 32, preventing equipment damage or safety hazards caused by abnormal current flow, and providing electrical isolation. Furthermore, by blocking current leakage paths, the accuracy of signal acquisition is guaranteed.

[0124] like Figure 10 As shown, in some embodiments, both the first sub-portion 3221 and the second sub-portion 3222 are provided with an observation hole 35 , and the observation hole 35 is arranged opposite to the electrode terminal 21 a .

[0125] When the integrated busbar 30 and battery cells 20 are assembled, the first portion 321 of the busbar 32 supports the second insulating member 34 and the flexible printed circuit board 31. The side of the second portion 322 of the busbar 32, facing away from the second insulating member 34, is positioned opposite the first insulating member 33 and contacts the electrode terminal 21a of the electrode assembly 23. After welding the busbar 32 to the electrode column, the user can observe the welds between the first and second sub-portions 3221, 3222, and the electrode terminal 21a through the viewing hole 35 to confirm compliance.

[0126] In addition, some embodiments of the present application further provide an electrical device, which includes the battery device 100 in the above embodiment.

[0127] Based on the same inventive concept, the electrical device has all the beneficial effects of the above-mentioned battery device 100 .

[0128] Specifically in one embodiment, Figure 4 As shown, the battery device 100 includes a battery cell 20 and an integrated busbar 30. Each battery cell 20 includes an electrode terminal 21a. Multiple battery cells 20 are arranged along a first direction X. The integrated busbar 30 includes a flexible circuit board 31, a busbar 32, a first insulating member 33, and a second insulating member 34. The first insulating member 33 sequentially supports the busbar 32, the second insulating member 34, and the flexible circuit board 31. The second insulating member 34 is positioned between the flexible circuit board 31 and the busbar 32 to insulate them.

[0129] The busbars 32 are divided into two groups along the second direction Y, each group being positioned opposite an electrode terminal 21a of a battery cell 20. A single busbar 32 includes a first portion 321 and a second portion 322 connected to the first portion 321. The first portion 321 is recessed relative to the second portion 322 along the thickness of the flexible circuit board 31, toward the battery cell 20. The first portions 321 of the busbars 32, spaced apart along the second direction Y, are positioned opposite each other and collectively support the flexible circuit board 31. The second portion 322 includes a first sub-portion 3221 and a second sub-portion 3222, sequentially connected along the first direction X. The first sub-portion 3221 is capable of connecting to one of the electrode terminals 21a of two adjacent battery cells 20, while the second sub-portion 3222 is capable of connecting to the electrode terminal 21a of the other battery cell 20.

[0130] In addition, some busbars 32 are further provided with limiting portions 323 , which can limit the bracket 50 together with the first insulating member 33 . The bracket 50 is mounted with a temperature collecting element 40 , which can collect the temperature of the end cap 21 of the battery cell 20 .

[0131] In summary, this solution stacks the first portion 321 of the busbar 32 with the flexible printed circuit board 31, increasing the cross-sectional area of ​​the busbar 32 and improving its current-carrying capacity, while maintaining the space occupied by the integrated busbar 30. Furthermore, the height difference between the first portion 321 and the second portion 322 of the busbar 32 serves to position the flexible printed circuit board 31 and reduce the likelihood of movement during installation.

[0132] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery device, characterized in that: include: a battery cell, including electrode terminals; An integrated busbar includes a flexible circuit board and a busbar, wherein the busbar includes a first portion and a second portion connected to the first portion, the first portion overlaps with and is electrically connected to the flexible circuit board, and the second portion is electrically connected to the electrode terminal.

2. The battery device according to claim 1, wherein: A recess is formed in any surface of the first part along its thickness direction. There is a height difference between the bottom surface of the recess and the surface of the second part. The portion of the flexible circuit board corresponding to the recess is accommodated in the recess.

3. The battery device according to claim 2, characterized in that A height difference between a bottom surface of the recess and a surface of the second portion is L, and 0.2 mm ≤ L ≤ 0.6 mm.

4. The battery device according to claim 2, wherein: A surface of the flexible circuit board facing away from the first portion is flush with a surface of the second portion.

5. The battery device according to claim 1, wherein: The battery cells include at least two, and at least some of the battery cells are arranged in sequence along a first direction; the flexible circuit board is arranged above the battery cells and extends along the first direction; the first portion and the second portion of the busbar are arranged along a second direction, and the first direction intersects the second direction; The first portion is stacked on the flexible circuit board along the second direction, and the second portion is connected to the electrode terminals of two battery cells adjacently arranged along the first direction.

6. The battery device according to claim 5, characterized in that The second portion includes a first subsection and a second subsection sequentially connected along the first direction. The electrode terminal of one of the two adjacent battery cells along the first direction is connected to the first subsection, and the electrode terminal of the other battery cell is connected to the second subsection.

7. The battery device according to claim 5, characterized in that The busbars include at least two groups, and the two groups of busbars are distributed at intervals along the second direction on both sides of the same flexible circuit board.

8. The battery device according to claim 7, characterized in that The integrated busbar further includes an external connector, which is arranged in two groups of the busbars on both sides of the same flexible circuit board, wherein the head end of one group of the busbars is provided with the external connector, and the external connector is electrically connected between the battery cell and the external element.

9. The battery device according to claim 5, characterized in that The battery device further includes a temperature collecting element connected to the flexible circuit board, wherein the temperature collecting element is used to collect temperature information of the battery cell; The busbars include at least two, and the temperature collection element is limitedly engaged with a side of one of the busbars facing the battery cell.

10. The battery device according to claim 9, characterized in that The battery device also includes a bracket, the temperature collection element is arranged in the bracket, and the busbar that is limitedly matched with the temperature collection element includes a limiting portion connected to the second part, and the limiting portion is pressed against the surface of the bracket along the thickness direction of the flexible circuit board.

11. The battery device according to claim 10, characterized in that The limiting portion and the first portion are arranged on the same side of the second portion, and the limiting portion is protruded relative to the second portion to form an accommodating groove.

12. The battery device according to claim 10, wherein: A through hole is provided on the limiting portion, and the through hole is arranged opposite to the temperature collecting element.

13. The battery device according to claim 10, wherein: The integrated busbar further includes a first insulating member, the first insulating member supports the flexible circuit board and the busbar, and the bracket is limited between the first insulating member and the limiting portion of the busbar.

14. The battery device according to claim 13, wherein: A blocking portion is protruded from the first insulating member and is located between two adjacent first portions to provide blocking in the second direction.

15. The battery device according to any one of claims 1 to 14, characterized in that The battery device further includes a second insulating member disposed between the first portion and the flexible circuit board.

16. An electrical device, characterized in that: A battery device comprising the battery device according to any one of claims 1 to 15.

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