Battery, electric device and bus assembly

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, a power utilization device and a bus assembly. The battery comprises a plurality of battery monomers and a confluence assembly, each battery monomer is provided with a pole, the confluence assembly is electrically connected with the poles of the plurality of battery monomers, the confluence assembly comprises a circuit board, a confluence piece and an electric connection terminal, the confluence piece is electrically connected with the poles of the battery monomers, and the electric connection terminal comprises a metal connection piece and a flexible connection piece which are arranged in a split mode and connected. The metal connecting sheet is connected with the bus sheet, and the flexible connecting sheet is connected with the circuit board. In the technical scheme of the embodiment of the invention, the structure of the circuit board can be simplified, the design difficulty can be reduced, when the flexible connecting sheet is damaged, only the flexible connecting sheet needs to be replaced, the maintenance is convenient, and the maintenance cost can be reduced; the hard metal connecting piece is welded with the confluence piece, so that the quality of a welding interface of the electric connecting terminal and the confluence piece can be improved, the confluence assembly is more reliable, and the use reliability of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery, a power utilization device and a busbar assembly. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The busbar of the battery in the related art is electrically connected with the circuit board, which is inconvenient to maintain and has high maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a battery, a power utilization device and a busbar assembly, which can improve the convenience of the maintenance process and also reduce the maintenance cost.

[0005] In a first aspect, the present application provides a battery, comprising a plurality of battery monomers and a busbar assembly, the battery monomers having a pole, the busbar assembly being electrically connected with the poles of the plurality of battery monomers, the busbar assembly comprising: a circuit board; a busbar, the busbar being electrically connected with the poles of the battery monomers; and an electrical connection terminal, the electrical connection terminal comprising a metal connection piece and a flexible connection piece which are separately arranged and connected, the metal connection piece being connected with the busbar, and the flexible connection piece being connected with the circuit board.

[0006] In the technical scheme of the present application, by arranging the electrical connection terminal to comprise a metal connection piece and a flexible connection piece which are separately arranged, on the one hand, the structure of the circuit board can be simplified and the design difficulty can be reduced, and on the other hand, when the flexible connection piece is damaged, only the flexible connection piece needs to be replaced, which is convenient for maintenance and is conducive to reducing the maintenance cost. In addition, the hard metal connection piece is welded with the busbar, which can improve the quality of the welding interface between the electrical connection terminal and the busbar, is conducive to improving the welding strength, makes the busbar assembly more reliable, and thus improves the use reliability of the battery.

[0007] In some embodiments, the thickness of the flexible connection piece is less than the thickness of the metal connection piece, and the flexible connection piece is surface mount welded with the metal connection piece. In the above technical scheme, by arranging the thickness of the flexible connection piece to be less than the thickness of the metal connection piece and surface mount welding the flexible connection piece with the metal connection piece, the welding method of the welding interface can be optimized, the welding strength is improved, the busbar assembly is more reliable, and thus the use reliability of the battery is improved.

[0008] In some embodiments, the thickness of the flexible connecting piece is less than 0.2 mm, and the thickness of the metal connecting piece is greater than or equal to 0.2 mm. In the above technical solution, by controlling the thickness of the flexible connecting piece and the metal connecting piece to meet the above range, on the one hand, the flexible connecting piece and the metal connecting piece can be suitable for surface mount welding, so that the welding reliability of the flexible connecting piece and the metal connecting piece is higher, and on the other hand, the structural strength of the metal connecting piece can be improved, so that the welding strength of the metal connecting piece and the bus bar can be improved, and the overall use reliability of the bus assembly can be improved.

[0009] In some embodiments, the thickness of the metal connecting piece is less than the thickness of the bus bar, and the metal connecting piece and the bus bar are connected by laser welding or ultrasonic welding. In the above technical solution, by limiting the thickness of the metal connecting piece to be less than the thickness of the bus bar, and connecting the metal connecting piece and the bus bar by laser welding or ultrasonic welding, the welding strength of the metal connecting piece and the bus bar can be improved, so that the welding strength of the electrical connection terminal and the bus bar can be improved, the probability of welding failure between the electrical connection terminal and the bus bar can be reduced, and the connection reliability can be improved.

[0010] In some embodiments, the thickness of the metal connecting piece is greater than or equal to 0.2 mm, and the thickness of the bus bar is 1.5 mm-2.5 mm. In the above technical solution, by limiting the thickness of the metal connecting piece and the thickness of the bus bar to meet the above range, the structural strength of the metal connecting piece and the bus bar can be improved, so that the welding strength of the metal connecting piece and the bus bar can be improved, and the overall use reliability of the bus assembly can be improved.

[0011] In some embodiments, the length of the area where the metal connecting piece and the bus bar are welded together is 10 mm-18 mm, and the width is 6 mm-8 mm. In the above technical solution, by limiting the area where the metal connecting piece and the bus bar are welded together to meet the above range, the area of the welding area of the metal connecting piece and the bus bar can be further improved, so that the welding strength of the metal connecting piece and the bus bar can be improved, and the overall use reliability of the bus assembly can be improved.

[0012] In some embodiments, the flexible connecting piece includes a deformable portion that is stretchable along the length direction thereof. In the above technical solution, by providing the deformable portion, the deformable portion can absorb a certain expansion displacement, reduce the probability of peeling of the welding interface between the flexible connecting piece and the circuit board and the welding interface between the flexible connecting piece and the metal connecting piece, and improve the welding reliability of the flexible connecting piece and the circuit board and the welding reliability of the flexible connecting piece and the metal connecting piece.

[0013] In some embodiments, the size of the two ends of the deformation part in the length direction of the flexible connecting piece is greater than or equal to 3 mm, and the width of the deformation part is greater than or equal to 1.3 mm. In the above technical solution, by limiting the size of the deformation part to meet the above range, the deformation part is more easily stretched and contracted in the length direction of the flexible connecting piece, and the welding reliability of the flexible connecting piece and the circuit board and the welding reliability of the flexible connecting piece and the metal connecting piece can be further improved.

[0014] In some embodiments, the circuit board is a flexible circuit board, and the flexible connecting piece is surface-mounted and welded to the flexible circuit board. Since the thicknesses of the flexible circuit board and the flexible connecting piece are relatively thin, surface-mounting and welding the flexible connecting piece to the flexible circuit board can optimize the welding interface of the two, improve the welding strength, and make the bus assembly more reliable.

[0015] In some embodiments, one end of the flexible connecting piece connected to the flexible circuit board is provided with a through hole. By providing the through hole on the flexible connecting piece, the through hole can be tinned during welding, improving the welding quality of the flexible connecting piece and the flexible circuit board, and thus improving the overall use reliability of the bus assembly.

[0016] In some embodiments, the number of through holes is greater than or equal to 2, and the diameter of the through hole is greater than or equal to 0.5 mm. In the above technical solution, by limiting the number of through holes and the diameter of the through hole to meet the above conditions, the welding quality of the flexible connecting piece and the flexible circuit board can be further improved, and thus the overall use reliability of the bus assembly can be improved.

[0017] In a second aspect, the present application provides a power consumption device comprising the battery in the above embodiments. In the technical solution of the present application, by using the above battery, the use reliability of the power consumption device can be improved.

[0018] In a third aspect, the present application provides a bus assembly, comprising: a circuit board and a bus piece; and an electrical connection terminal comprising a metal connecting piece and a flexible connecting piece arranged separately and connected, the metal connecting piece being connected to the bus piece, and the flexible connecting piece being connected to the circuit board.

[0019] In the technical solution of the present application, by arranging the electrical connection terminal to comprise a metal connecting piece and a flexible connecting piece arranged separately, on the one hand, the structure of the circuit board can be simplified, the design difficulty can be reduced, and when the flexible connecting piece is damaged, only the flexible connecting piece needs to be replaced, maintenance is convenient, and maintenance costs can be reduced. On the other hand, welding the hard metal connecting piece to the bus piece can improve the quality of the welding interface of the electrical connection terminal and the bus piece, and is conducive to improving the welding strength.

[0020] In some embodiments, the thickness of the metal connecting piece is less than the thickness of the busbar, and the flexible connecting piece is surface mount welded to the metal connecting piece. In the above technical solution, by setting the thickness of the flexible connecting piece to be less than the thickness of the metal connecting piece, and surface mount welding the flexible connecting piece to the metal connecting piece, the welding mode of the welding interface can be optimized, the welding strength is improved, and the busbar assembly is more reliable.

[0021] In some embodiments, the circuit board is a flexible circuit board, and the flexible connecting piece is surface mount welded to the flexible circuit board. Surface mount welding the flexible connecting piece to the flexible circuit board can optimize the welding interface of the two, improve the welding strength, and make the busbar assembly more reliable.

[0022] In some embodiments, the thickness of the metal connecting piece is less than the thickness of the busbar, and the metal connecting piece and the busbar are laser welded or ultrasonic welded. In the above technical solution, by limiting the thickness of the metal connecting piece to be less than the thickness of the busbar, and laser welding or ultrasonic welding the metal connecting piece and the busbar together, the welding strength of the metal connecting piece and the busbar can be improved, thereby improving the welding strength of the electrical connection terminal and the busbar, reducing the probability of welding failure between the electrical connection terminal and the busbar, and improving the connection reliability.

[0023] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in all the drawings represent the same or similar elements. In the drawings:

[0025] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0026] Figure 2 An exploded view of a battery is provided for some embodiments of the present application;

[0027] Figure 3 A perspective view of a busbar assembly is provided for some embodiments of the present application;

[0028] Figure 4 An enlarged view of part A shown in FIG. 8 is provided for some embodiments of the present application; Figure 3 ​

[0029] Figure 5 is Figure 3 a perspective view of the electric connection terminal of the bus assembly shown in FIG. 1;

[0030] Figure 6 is Figure 3 a front view of the electric connection terminal of the bus assembly shown in FIG. 1;

[0031] Figure 7 is Figure 3 a structural schematic diagram of the bus assembly shown in FIG. 1 without the bus sheet;

[0032] Figure 8 is Figure 7 an enlarged view of part B shown in FIG. 1.

[0033] The reference signs in the detailed description are as follows:

[0034] the vehicle 1000,

[0035] the battery 100,

[0036] the box body 11, the first box body 111, the second box body 112,

[0037] the battery cell 12, the pole 121,

[0038] the bus assembly 13, the circuit board 131, the mounting port 1311, the bus sheet 132, the electric connection terminal 133, the metal connecting sheet 1331, the flexible connecting sheet 1332, the deformation part 13321, the through hole 13322, the notch 13323,

[0039] the controller 200, the motor 300. DETAILED DESCRIPTION

[0040] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0043] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can 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 all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0049] The busbar of the battery of the related art is electrically connected with the circuit board, the circuit board comprises a trunk portion and a plurality of branch portions which are integrally arranged, the middle portion of the branch portion is bent, the busbar comprises a main body and a terminal, the main body and the terminal are welded and connected, and the branch portion and the terminal of the busbar are connected.

[0050] However, since the trunk portion and the plurality of branch portions are integrally arranged, when the busbar is designed, the arrangement position of the branch portion needs to be reserved, and the design difficulty of the internal wire arrangement of the circuit board is increased, and when the branch portion is damaged, the entire circuit board needs to be replaced, which is inconvenient for maintenance and has high maintenance cost.

[0051] Therefore, the battery provided in the application comprises a busbar assembly, the busbar assembly comprises a circuit board, a busbar and an electric connection terminal, the electric connection terminal comprises a metal connecting piece and a flexible connecting piece which are separately arranged, so that the structure of the circuit board can be simplified and the design difficulty can be reduced, and when the flexible connecting piece is damaged, only the flexible connecting piece needs to be replaced, which is convenient for maintenance and is conducive to reducing the maintenance cost.

[0052] The battery disclosed in the embodiments of the application can be used in an electric device using the battery as a power supply or a variety of energy storage systems using the battery as an energy storage element. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy and the like, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0053] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0054] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0055] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Please refer to Figure 2 , Figure 2 An exploded view of the battery 100 is provided for some embodiments of the present application. The battery 100 includes a box body 11. The box body 11 can adopt various structures. In some embodiments, the box body 11 can include a first box body 111 and a second box body 112, the first box body 111 and the second box body 112 are mutually covered, and the first box body 111 and the second box body 112 jointly define a containing space. The second box body 112 can be a hollow structure with one end open, and the first box body 111 can be a plate-shaped structure, which is covered on the open side of the second box body 112 to jointly define the containing space with the second box body 112; the first box body 111 and the second box body 112 can also be hollow structures with one side open, and the open side of the first box body 111 is covered on the open side of the second box body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can have various shapes, such as a cylinder, a cuboid, etc.

[0057] The battery 100 further includes battery monomers 12, which are contained in the containing space defined by the box body 11. The battery monomers 12 can be multiple, and the multiple battery monomers 12 can be connected in series, in parallel, or in a mixed connection, wherein the mixed connection means that there are both series connection and parallel connection among the multiple battery monomers 12. The multiple battery monomers 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery monomers 12 is contained in the box body 11; of course, the battery 100 can also be that the multiple battery monomers 12 are first connected in series, in parallel, or in a mixed connection to form a battery 100 module, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 11.

[0058] Each battery cell 12 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 battery cell 12 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes. The battery cell 12 has a pole 121.

[0059] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , Figure 3 is a perspective view of the bus assembly 13 of some embodiments of the present application, Figure 4 is Figure 3 is an enlarged view of part A shown in FIG. 1. The battery 100 further includes a bus assembly 13 electrically connected to the poles 121 of the battery cells 12.

[0060] The bus assembly 13 includes a circuit board 131, a bus sheet 132 electrically connected to the poles 121 of the battery cells 12, and an electrical connection terminal 133 including a metal connecting sheet 1331 and a flexible connecting sheet 1332, which are separately arranged and connected. The metal connecting sheet 1331 is connected to the bus sheet 132, and the flexible connecting sheet 1332 is connected to the circuit board 131.

[0061] In the technical solution of the embodiments of the present application, by arranging the electrical connection terminal 133 to include the separately arranged metal connecting sheet 1331 and flexible connecting sheet 1332, on the one hand, the structure of the circuit board 131 can be simplified, and the design difficulty can be reduced. On the other hand, when the flexible connecting sheet 1332 is damaged, only the flexible connecting sheet 1332 needs to be replaced, which is convenient for maintenance and helps to reduce maintenance costs.

[0062] In addition, in another related art, the bus sheet of the battery is connected to the soft terminal by welding, resulting in weak welding strength, easy failure of the welding point, and easy separation of the terminal from the bus sheet. Therefore, by replacing the soft terminal in the related art with the flexible connecting sheet 1332 and the metal connecting sheet 1331 of the present application, the original soft terminal and the bus sheet are connected by welding, which is replaced by the hard metal connecting sheet 1331 and the bus sheet 132 connected by welding, optimizing the welding mode of the welding interface, improving the welding strength, making the bus assembly 13 more reliable, and thus improving the use reliability of the battery 100.

[0063] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 3 is a perspective view of the electrical connection terminal 133 of the bus assembly 13 shown in FIG. 1; Figure 6 is Figure 3A front view of the electric connection terminal 133 of the busbar assembly 13 shown in FIG. 1. The thickness of the flexible connection sheet 1332 is less than the thickness of the metal connection sheet 1331, and the flexible connection sheet 1332 is surface mounted and welded (SMT) to the metal connection sheet 1331.

[0064] In another related technology, the busbar of the battery is welded to the soft terminal, which results in weak welding strength and easy failure of the welding spot, causing the terminal to easily separate from the busbar. Since surface mount welding is suitable for welding of structures with thin thickness, and the surface mount welding strength is generally higher than the laser welding strength, replacing the soft terminal in another related technology with the flexible connection sheet 1332 and the metal connection sheet 1331 of the present application is equivalent to replacing the original laser welding or ultrasonic welding of the soft terminal to the busbar with the surface mount welding of the flexible connection sheet 1332 and the metal connection sheet 1331, optimizing the welding method of the welding interface and improving the welding strength, making the busbar assembly 13 more reliable.

[0065] Therefore, in the above technical solution, by setting the thickness of the flexible connection sheet 1332 to be less than the thickness of the metal connection sheet 1331, the flexible connection sheet 1332 is surface mounted and welded to the metal connection sheet 1331, which can optimize the welding method of the welding interface, improve the welding strength, and make the busbar assembly 13 more reliable.

[0066] In some embodiments, the thickness of the flexible connection sheet 1332 is less than 0.2 mm, and the thickness of the metal connection sheet 1331 is greater than or equal to 0.2 mm. For example, the thickness of the flexible connection sheet 1332 can be 0.05 mm, 0.1 mm, 0.15 mm, etc., and the thickness of the metal connection sheet 1331 can be 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0067] In the above technical solution, by controlling the thickness of the flexible connection sheet 1332 and the metal connection sheet 1331 to meet the above range, on the one hand, the flexible connection sheet 1332 and the metal connection sheet 1331 can be suitable for surface mount welding, making the welding reliability of the flexible connection sheet 1332 and the metal connection sheet 1331 higher, and on the other hand, the structural strength of the metal connection sheet 1331 can be improved, thereby improving the welding strength of the metal connection sheet 1331 and the busbar 132, and further improving the overall use reliability of the busbar assembly 13.

[0068] In some embodiments, the thickness of the metal connection sheet 1331 is less than the thickness of the busbar 132, and the metal connection sheet 1331 and the busbar 132 are laser welded or ultrasonic welded.

[0069] Since the power requirement of laser welding or ultrasonic welding is relatively high, if the thickness of the metal connecting piece 1331 is too large, it is easy to cause the metal connecting piece 1331 and the bus bar 132 to be not easy to weld.

[0070] Therefore, in the above technical solution, by limiting the thickness of the metal connecting piece 1331 to be less than the thickness of the bus bar 132, and connecting the metal connecting piece 1331 and the bus bar 132 together by laser welding or ultrasonic welding, the welding strength of the metal connecting piece 1331 and the bus bar 132 can be improved, thereby improving the welding strength of the electrical connection terminal 133 and the bus bar 132, reducing the probability of welding failure between the electrical connection terminal 133 and the bus bar 132, and improving the connection reliability.

[0071] In some embodiments, the thickness of the metal connecting piece 1331 is greater than or equal to 0.2mm, and the thickness of the bus bar 132 is 1.5mm-2.5mm. For example, the thickness of the metal connecting piece 1331 can be 0.2mm, 0.25mm, 0.3mm, etc., and the thickness of the bus bar 132 can be 1.5mm, 2mm, 2.5mm, etc.

[0072] In the above technical solution, by limiting the thickness of the metal connecting piece 1331 and the thickness of the bus bar 132 to meet the above range, the structural strength of the metal connecting piece 1331 and the bus bar 132 can be improved, thereby improving the welding strength of the metal connecting piece 1331 and the bus bar 132, and further improving the overall use reliability of the bus assembly 13.

[0073] Please refer again to Figure 4 In some embodiments, the length M of the area where the metal connecting piece 1331 and the bus bar 132 are welded together is 10mm-18mm, and the width N is 6mm-8mm. For example, the length M of the area where the metal connecting piece 1331 and the bus bar 132 are welded together can be 10mm, 12mm, 14mm, 16mm, 18mm, etc., and the width N can be 6mm, 7mm, 8mm, etc.

[0074] In the above technical solution, by limiting the area where the metal connecting piece 1331 and the bus bar 132 are welded together to meet the above range, the welding area of the metal connecting piece 1331 and the bus bar 132 can be further improved, thereby improving the welding strength of the metal connecting piece 1331 and the bus bar 132, and further improving the overall use reliability of the bus assembly 13.

[0075] Please refer again to Figure 5 and Figure 6 In some embodiments, the flexible connecting piece 1332 includes a deformation portion 13321, and the deformation portion 13321 can stretch and contract along the length direction of the flexible connecting piece 1332.

[0076] For example, the deformation portion 13321 can form a multi-bending structure, so that the deformation portion 13321 can stretch and contract along the length direction of the flexible connecting piece 1332. For example, the two sides of the local area of the flexible connecting piece 1332 in the width direction are respectively provided with staggered notches 13323, so that the width of the local area is reduced, thereby forming the deformation portion 13321, and facilitating the stretching and contraction of the deformation portion 13321 along the length direction of the flexible connecting piece 1332.

[0077] In the above technical solution, by arranging the deformation portion 13321, the deformation portion 13321 can absorb a certain expansion displacement, reduce the probability of peeling of the welding interface between the flexible connecting piece 1332 and the circuit board 131, and the welding interface between the flexible connecting piece 1332 and the metal connecting piece 1331, and improve the welding reliability of the flexible connecting piece 1332 and the circuit board 131, and the welding reliability of the flexible connecting piece 1332 and the metal connecting piece 1331.

[0078] Please refer to Figure 6 In some embodiments, the size L1 of the two ends of the deformation portion 13321 in the length direction of the flexible connecting piece 1332 is greater than or equal to 3mm, and the width L2 of the deformation portion 13321 is greater than or equal to 1.3mm. For example, the size L1 of the two ends of the deformation portion 13321 in the length direction of the flexible connecting piece 1332 can be 3mm, 3.5mm, 4mm, etc., and the width L2 of the deformation portion 13321 can be 1.3mm, 1.5mm, 1.8mm, 2mm, etc.

[0079] In the above technical solution, by limiting the size of the deformation portion 13321 to meet the above range, the deformation portion 13321 is more easily stretched and contracted along the length direction of the flexible connecting piece 1332, and the welding reliability of the flexible connecting piece 1332 and the circuit board 131, and the welding reliability of the flexible connecting piece 1332 and the metal connecting piece 1331 can be further improved.

[0080] In the above technical solution, by limiting the size of the deformation portion 13321 to meet the above range, the deformation portion 13321 is more easily stretched and contracted along the length direction of the flexible connecting piece 1332, and the welding reliability of the flexible connecting piece 1332 and the circuit board 131, and the welding reliability of the flexible connecting piece 1332 and the metal connecting piece 1331 can be further improved.

[0081] Please refer to Figure 4 In some embodiments, the circuit board 131 is a flexible circuit board 131, and the flexible connecting piece 1332 is connected to the surface mount welding of the flexible circuit board 131.

[0082] Since the thicknesses of the flexible circuit board 131 and the flexible connecting sheet 1332 are relatively thin, the flexible connecting sheet 1332 is connected to the surface mount welding of the flexible circuit board 131, the welding interface of the two can be optimized, the welding strength is improved, and the current collection assembly 13 is more reliable.

[0083] Please refer again to Figure 4 In some embodiments, the flexible circuit board 131 is provided with a mounting port 1311 near the side edge thereof, and the flexible connecting sheet 1332 can be arranged at the mounting port 1311. The flexible connecting sheet 1332 and the flexible circuit board 131 are separately arranged and connected by surface mount welding.

[0084] Compared with the technical solution in the related art that the circuit board 131 includes an integral trunk portion and a plurality of branch portions, the flexible circuit board 131 and the flexible connecting sheet 1332 are separately arranged in the present application. Not only can the structure of the circuit board 131 in the related art be simplified and the design difficulty be reduced, but also when the flexible connecting sheet 1332 is damaged, only the flexible connecting sheet 1332 needs to be replaced, which is convenient for maintenance and is conducive to reducing the maintenance cost.

[0085] Please refer again to Figure 4 and Figure 5 In some embodiments, the end of the flexible connecting sheet 1332 connected to the flexible circuit board 131 is provided with a through hole 13322. By arranging the through hole 13322 on the flexible connecting sheet 1332, tin climbing can occur at the through hole 13322 during welding, the welding quality of the flexible connecting sheet 1332 and the flexible circuit board 131 is improved, and thus the overall use reliability of the current collection assembly 13 can be improved.

[0086] In some embodiments, the number of the through holes 13322 is greater than or equal to 2, and the diameter of the through holes 13322 is greater than or equal to 0.5 mm. For example, the number of the through holes 13322 can be 2, 3, 4, etc., and the diameter of the through holes 13322 can be 0.5 mm, 0.8 mm, 1 mm, etc. The size of the end of the flexible connecting sheet 1332 connected to the flexible circuit board 131 can be selected according to the size.

[0087] In the above technical solution, by limiting the number of the through holes 13322 and the diameter of the through holes 13322 to meet the above conditions, the welding quality of the flexible connecting sheet 1332 and the flexible circuit board 131 can be further improved, and thus the overall use reliability of the current collection assembly 13 can be improved.

[0088] Please refer again to Figure 3 and further refer to Figure 7 and Figure 8 , Figure 7 for Figure 3 a structural schematic view of the current collection assembly 13 shown in FIG. 1, in which the structure of the current collection sheet 132 is removed.Figure 8 yes Figure 7 The enlarged view of part B shown is provided. The circuit board 131 extends along the length direction in the first direction (X direction as shown in the figure) and along the width direction in the second direction (Y direction as shown in the figure). There are multiple electrical connection terminals 133, which are distributed on both sides of the width direction of the circuit board 131. There are multiple busbars 132, which are located on both sides of the width direction of the circuit board 131. Each busbar 132 is electrically connected to the corresponding electrical connection terminal 133, so that multiple busbars 132 are electrically connected to the circuit board 131. The busbar 132 can be electrically connected to the terminal 121 of one battery cell 12, or it can be electrically connected to the terminal 121 of two or more battery cells 12.

[0089] Please refer to Figures 2-8 According to some embodiments of this application, a battery 100 is provided. The battery 100 includes a housing 11, a plurality of battery cells 12 and a current collector 13. The plurality of battery cells 12 are arranged in an array within the housing 11, and the current collector 13 is electrically connected to the terminals 121 of the plurality of battery cells 12.

[0090] Specifically, the busbar assembly 13 includes a circuit board 131, a busbar 132, and an electrical connection terminal 133. The electrical connection terminal 133 includes a metal connecting piece 1331 and a flexible connecting piece 1332. The metal connecting piece 1331 and the flexible connecting piece 1332 are separately arranged and surface-mount welded together. The circuit board 131 is a flexible circuit board 131. The flexible circuit board 131 and the flexible connecting piece 1332 are surface-mount welded together. The metal connecting piece 1331 and the busbar 132 are laser welded or ultrasonically welded together.

[0091] According to some embodiments of this application, this application also provides an electrical device, including the battery 100 described above, and the battery 100 is used to provide electrical energy to the electrical device.

[0092] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0093] In the technical solution of this application embodiment, by using the above-mentioned battery 100, the reliability of the power device can be improved.

[0094] Please refer to Figures 3-6As shown, according to some embodiments of the present application, the present application also provides a busbar assembly 13. The busbar assembly 13 comprises a circuit board 131, a busbar 132, and an electrical connection terminal 133, the electrical connection terminal 133 comprising a metal connecting piece 1331 and a flexible connecting piece 1332, the metal connecting piece 1331 and the flexible connecting piece 1332 being separately arranged and connected, the metal connecting piece 1331 being connected with the busbar 132, and the flexible connecting piece 1332 being connected with the circuit board 131.

[0095] In the technical scheme of the embodiments of the present application, by arranging the electrical connection terminal 133 to comprise the separately arranged metal connecting piece 1331 and flexible connecting piece 1332, on the one hand, the structure of the circuit board 131 can be simplified, and the design difficulty can be reduced, and on the other hand, when the flexible connecting piece 1332 is damaged, only the flexible connecting piece 1332 needs to be replaced, which is convenient for maintenance and helps to reduce the maintenance cost.

[0096] In addition, in another related technology, the busbar of the battery is connected with the soft terminal by welding, which results in weak welding strength, easy failure of the welding point, and easy separation of the terminal and the busbar. Therefore, by replacing the soft terminal in the related technology with the flexible connecting piece 1332 and the metal connecting piece 1331 of the present application, the original soft terminal and the busbar are connected by welding, which is replaced by the hard metal connecting piece 1331 and the busbar 132 connected by welding, the welding mode of the welding interface is optimized, the welding strength is improved, the busbar assembly 13 is more reliable, and thus the use reliability of the battery 100 is improved.

[0097] In some embodiments, the thickness of the flexible connecting piece 1332 is less than the thickness of the metal connecting piece 1331, and the flexible connecting piece 1332 is connected with the metal connecting piece 1331 by surface mount welding.

[0098] Replacing the soft terminal in another related technology with the flexible connecting piece 1332 and the metal connecting piece 1331 of the present application is equivalent to replacing the original soft terminal and the busbar 132 by laser welding or ultrasonic welding with the flexible connecting piece 1332 and the metal connecting piece 1331 connected by surface mount welding, which optimizes the welding mode of the welding interface, improves the welding strength, and makes the busbar assembly 13 more reliable.

[0099] Therefore, in the above technical scheme, by arranging the thickness of the flexible connecting piece 1332 to be less than the thickness of the metal connecting piece 1331 and connecting the flexible connecting piece 1332 with the metal connecting piece 1331 by surface mount welding, the welding mode of the welding interface can be optimized, the welding strength is improved, and the busbar assembly 13 is more reliable.

[0100] In some embodiments, the circuit board 131 is a flexible circuit board 131, and the flexible connecting piece 1332 is connected to the surface mount welding of the flexible circuit board 131.

[0101] Since the thicknesses of the flexible circuit board 131 and the flexible connecting piece 1332 are relatively thin, connecting the flexible connecting piece 1332 to the surface mount welding of the flexible circuit board 131 can optimize the welding interface of the two, improve the welding strength, and make the bus assembly 13 more reliable.

[0102] In some embodiments, the thickness of the metal connecting piece 1331 is less than the thickness of the bus piece 132, and the metal connecting piece 1331 and the bus piece 132 are connected by laser welding or ultrasonic welding.

[0103] Since the power requirement of laser welding or ultrasonic welding is relatively high, if the thickness of the metal connecting piece 1331 is too large, the metal connecting piece 1331 and the bus piece 132 are not easy to weld.

[0104] Therefore, in the above technical solution, by limiting the thickness of the metal connecting piece 1331 to be less than the thickness of the bus piece 132, and connecting the metal connecting piece 1331 and the bus piece 132 by laser welding or ultrasonic welding, the welding strength of the metal connecting piece 1331 and the bus piece 132 can be improved, thereby improving the welding strength of the electrical connection terminal 133 and the bus piece 132, reducing the probability of welding failure between the electrical connection terminal 133 and the bus piece 132, and improving the connection reliability.

[0105] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, The system includes multiple battery cells and a current collector assembly. Each battery cell has a terminal, and the current collector assembly is electrically connected to the terminals of the multiple battery cells. The current collector assembly includes: Circuit board; The busbar is electrically connected to the terminal of the battery cell; The electrical connection terminal includes a separate but connected metal connecting piece and a flexible connecting piece, wherein the metal connecting piece is connected to the busbar and the flexible connecting piece is connected to the circuit board.

2. The battery according to claim 1, characterized in that, The thickness of the flexible connecting piece is less than the thickness of the metal connecting piece, and the flexible connecting piece is surface-mounted and welded to the metal connecting piece.

3. The battery according to claim 2, characterized in that, The thickness of the flexible connecting piece is less than 0.2 mm, and the thickness of the metal connecting piece is greater than or equal to 0.2 mm.

4. The battery according to claim 1, characterized in that, The thickness of the metal connecting piece is less than the thickness of the busbar, and the metal connecting piece and the busbar are connected by laser welding or ultrasonic welding.

5. The battery according to claim 4, characterized in that, The thickness of the metal connecting piece is greater than or equal to 0.2 mm, and the thickness of the busbar is 1.5 mm to 2.5 mm.

6. The battery according to claim 4, characterized in that, The length of the area where the metal connecting piece and the busbar are welded together is 10mm-18mm, and the width is 6mm-8mm.

7. The battery according to claim 1, characterized in that, The flexible connecting piece includes a deformable portion that can stretch and extend along its length.

8. The battery according to claim 7, characterized in that, The two ends of the deformable part have a dimension greater than or equal to 3 mm in the length direction of the flexible connecting piece, and the width of the deformable part is greater than or equal to 1.3 mm.

9. The battery according to any one of claims 1-8, characterized in that, The circuit board is a flexible circuit board, and the flexible connecting piece is attached to the surface of the flexible circuit board by surface mounting and welding.

10. The battery according to claim 9, characterized in that, The flexible connecting piece has a through hole at one end where it connects to the flexible circuit board.

11. The battery according to claim 10, characterized in that, The number of through holes is greater than or equal to 2, and the diameter of the through holes is greater than or equal to 0.5 mm.

12. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-11.

13. A bus component, characterized in that, include: Circuit boards and busbars; The electrical connection terminal includes a separate but connected metal connecting piece and a flexible connecting piece, wherein the metal connecting piece is connected to the busbar and the flexible connecting piece is connected to the circuit board.

14. The bus assembly according to claim 13, characterized in that, The thickness of the metal connecting piece is less than the thickness of the busbar, and the flexible connecting piece is surface-mounted and welded to the metal connecting piece.

15. The bus assembly according to claim 13, characterized in that, The circuit board is a flexible circuit board, and the flexible connecting piece is attached to the surface of the flexible circuit board by surface mounting and welding.

16. The bus assembly according to claim 13, characterized in that, The thickness of the metal connecting piece is less than the thickness of the busbar, and the metal connecting piece and the busbar are connected by laser welding or ultrasonic welding.

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