Battery and electric device

Abstract

A battery (100) and an electric device. The battery (100) comprises an insulating plate (20), a circuit board (30), and battery cells (10). The circuit board (30) is arranged on the insulating plate (20). In the thickness direction (X) of the insulating plate (20), the battery cells (10) are arranged on one side of the insulating plate (20). One end of each battery cell (10) facing the insulating plate (20) is provided with an electrode terminal (11). Busbars (40) are arranged on the insulating plate (20); each busbar (40) comprises a first connection layer (41), a second connection layer (42) and a first bending layer (43) connecting the first connection layer (41) and the second connection layer (42); the first connection layer (41) comprises a main body area (411) and a connection area (412); the main body area (411) overlaps the second connection layer (42) in the thickness direction (X); the connection area (412) and the second connection layer (42) do not overlap in the thickness direction (X); the connection area (412) is connected to at least one of the electrode terminal (11), the insulating plate (20) and the circuit board (30).

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420273548.2, filed on February 4, 2024, entitled “Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0004] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0005] In the development of battery technology, how to improve battery reliability has always been a research direction in battery technology.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery and an electrical device that can improve the reliability of the battery.

[0008] On the one hand, an embodiment of the present application provides a battery. The battery includes an insulating plate, a circuit board, and a battery cell. The circuit board is disposed on the insulating plate. Along the thickness direction of the insulating plate, the battery cell is disposed on one side of the insulating plate. An electrode terminal is provided at one end of the battery cell facing the insulating plate. A busbar is disposed on the insulating plate, the busbar including a first connecting layer, a second connecting layer, and a first bending layer connecting the first connecting layer and the second connecting layer. The first connecting layer includes a main body area and a connecting area. The main body area overlaps with the second connecting layer in the thickness direction, the connecting area does not overlap with the second connecting layer in the thickness direction, and the connecting area is connected to at least one of the electrode terminal, the insulating plate, and the circuit board.

[0009] In the above scheme, the current carrying capacity of the busbar is improved by providing a first connection layer and a second connection layer, and the connection area of ​​the first connection layer and the second connection layer do not overlap in the thickness direction, which can reduce the rigidity of the busbar connection area, so that when the battery cell expands, the connection area of ​​the busbar can deform along with the deformation of other components, thereby reducing the possibility of cracking or even disconnection at the connection between the busbar and other components, and improving the reliability of the battery.

[0010] In some embodiments, the second connection layer is provided with a relief portion exposing the connection region.

[0011] In the above solution, the avoidance portion can reduce the thickness of the connection area, thereby reducing the stiffness of the bus in this area, so that when the battery cell expands, the connection area of ​​the bus can deform along with the deformation of other components, thereby reducing the possibility of cracking or even disconnection at the connection between the bus and other components, and improving the reliability of the battery.

[0012] In some embodiments, the avoidance portion includes a through hole, which penetrates the second connection layer to reduce the difficulty of manufacturing the second connection layer, thereby reducing the difficulty of manufacturing the busbar.

[0013] In some embodiments, the connection region includes a first connection portion electrically connected to the electrode terminal, a second connection portion electrically connected to the insulating plate, and a third connection portion electrically connected to the circuit board. The relief portion includes a first relief portion, a second relief portion, and a third relief portion, with at least two of the first, second, and third relief portions spaced apart. The first connection portion and the first relief portion are arranged in a corresponding manner along the thickness direction, the second connection portion and the second relief portion are arranged in a corresponding manner along the thickness direction, and the third connection portion and the third relief portion are arranged in a corresponding manner along the thickness direction.

[0014] In the above solution, while reducing the rigidity of the connection area, the overall thickness of the busbar is increased as much as possible, thereby increasing the current carrying capacity of the busbar and improving the charging efficiency of the battery.

[0015] In some embodiments, the first connection portion includes a conductive connection portion and a positioning hole, the positioning hole is set through the first connection portion, and the conductive connection portion is used to electrically connect to the electrode terminal.

[0016] In the above solution, reducing the manufacturing tolerance after the first connection part and the electrode terminal are fixedly connected is conducive to reducing the tolerance size of the first connection part, further increasing the area of ​​the overlapping area between the main area and the second connection layer, and thus increasing the current carrying capacity of the busbar.

[0017] In some embodiments, the second connection portion is provided with a connection hole, the insulating plate is provided with a protrusion, at least a portion of the protrusion is disposed in the connection hole, and the protrusion is riveted to the connection hole.

[0018] In the above solution, fixing the busbar and the insulating plate together by riveting can reduce the manufacturing difficulty, improve the connection reliability between the busbar and the insulating plate, and reduce the possibility of separation between the busbar and the insulating plate due to vibration.

[0019] In some embodiments, a surface of the protrusion facing away from the insulation board is not higher than a surface of the second connection layer facing away from the first connection layer.

[0020] In the above solution, it is beneficial to reduce the risk of interference between the protrusion and other components, reduce the overall height after the insulation plate and the bus are connected, and thus reduce the height of the battery and improve the energy density of the battery.

[0021] In some embodiments, the battery further includes a connector, wherein the third connector protrudes relative to the first connector in a direction away from the first connector layer, the third connector is electrically connected to the circuit board through the connector, and the connector is disposed on the side of the third connector facing the second connector layer.

[0022] In the above solution, when the third connecting portion and the connecting member are fixedly connected, the battery cell can provide a supporting force for the third connecting portion, thereby improving the connection reliability between the third connecting portion and the connecting member.

[0023] In some embodiments, the bus includes a bending area and two or more straight areas, the two or more straight areas are arranged on both sides of the bending area, the bending area protrudes from the straight area in a direction away from the first connecting layer, and the first avoidance portion and the first connecting portion are arranged in the straight area.

[0024] In the above solution, when the battery cell expands, the bent area can deform to reduce the tension caused by the straight area on the electrode terminal, thereby reducing the possibility of cracking at the connection between the first connecting portion in the straight area and the electrode terminal, and improving the reliability of the busbar.

[0025] In some embodiments, the second avoiding portion and the second connecting portion are at least disposed in the bending area.

[0026] In the above solution, the second connecting portion is arranged in the bending area, so that the position of the busbar on the insulating plate is relatively fixed, thereby reducing the possibility of the relative position between the busbar and the insulating plate changing when the battery cell expands and contracts, thereby reducing the possibility of the busbar separating from the insulating plate or even interfering with other components.

[0027] In some embodiments, the number of the second connection layer includes a plurality, and the plurality of second connection layers are located on the same side of the first connection layer.

[0028] In the above solution, by providing a plurality of second connection layers, the avoidance portion and the thickness of the second connection layer can be arranged more flexibly, thereby increasing the applicability of the busbar and reducing the difficulty of manufacturing the avoidance portion.

[0029] In some embodiments, the second connecting layer is located on a side of the first connecting layer facing away from the battery cell, thereby reducing the possibility of interference between the second connecting layer and the electrode terminal.

[0030] In some embodiments, the main area and the second connection layer are connected by conductive glue or welding, which is beneficial to reducing the resistance of the contact surface between the main area and the second connection layer, improving the current carrying capacity of the bus, and reducing the possibility of separation between the first connection layer and the second connection layer.

[0031] In some embodiments, the busbar further includes a third connecting layer and a second bending layer. One of the first connecting layer and the second connecting layer is connected to the third connecting layer via the second bending layer, and the first connecting layer, the second connecting layer, and the third connecting layer are stacked along the thickness direction. The connecting region does not overlap with the third connecting layer along the thickness direction.

[0032] In the above solution, the current capacity is further increased, the charging speed of the battery is improved, and the possibility that the bending layer becomes more difficult or even cannot be bent due to the single connecting layer being too thick is reduced.

[0033] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0034] 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

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0036] FIG1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0037] FIG2 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0038] FIG3 is a schematic structural diagram of a battery module provided in an embodiment of the present application;

[0039] FIG4 is a schematic diagram of an exploded structure of another battery provided in an embodiment of the present application;

[0040] FIG5 is a schematic structural diagram of a bus provided in an embodiment of the present application;

[0041] FIG6 is a schematic diagram of a top view of a battery provided in an embodiment of the present application;

[0042] FIG7 is a schematic cross-sectional view of the structure of FIG6 taken along line AA;

[0043] FIG8 is an enlarged structural diagram of R in FIG7 ;

[0044] FIG9 is an enlarged structural diagram of Q in FIG6 ;

[0045] FIG10 is an enlarged structural diagram of P in FIG4 ;

[0046] FIG11 is a schematic structural diagram of another bus provided in an embodiment of the present application;

[0047] FIG12 is a schematic structural diagram of another bus provided in an embodiment of the present application;

[0048] FIG13 is a schematic structural diagram of another bus provided in an embodiment of the present application.

[0049] In the attached figure:

[0050] 1000, vehicle;

[0051] 100, battery; 200, controller; 300, motor; 400, housing; 410, first housing portion; 420, second housing portion; 430, storage portion; 500, battery module;

[0052] 10. Battery cell; 11. Electrode terminal; 20. Insulation plate; 21. Protrusion; 211. Main body; 212. Snap-fit ​​portion; 22. Protrusion structure;

[0053] 30. Circuit board;

[0054] 40. Busbar; 41. First connection layer; 411. Main body; 412. Connection area; 4121. First connection portion; 4121a. Conductive connection portion; 4121b. Positioning hole; 4122. Second connection portion; 4122a. Connection hole; 4123. Third connection portion; 42. Second connection layer; 421. Avoidance portion; 4211. First avoidance portion; 4212. Second avoidance portion; 4213. Third avoidance portion; 43. First bending layer; 44. Third connection layer; 45. Second bending layer; 50. Connector;

[0055] A1, straight area; A2, bending area;

[0056] X, thickness direction. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0060] 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.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] In the description of the embodiments of the present application, 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).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0064] 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.

[0065] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0066] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0067] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0068] In some embodiments, the housing may be provided with functional components such as electrode terminals, etc. The electrode terminals may be used to electrically connect to the electrode assembly to output or input electrical energy of the battery cell.

[0069] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0070] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0071] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0072] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0073] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0074] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0075] At present, multiple battery cells of a battery are electrically connected through multiple buses. The current carrying capacity of the bus affects the charging speed of the battery. The greater the current carrying capacity of the bus, the faster the battery charges. The current carrying capacity of the bus is usually improved by increasing the width dimension or increasing its own thickness. The width dimension is affected by the width of the battery cell. If the width dimension of the bus exceeds the width of the battery cell, the energy density will be reduced. Increasing its own thickness will not only make it more difficult to connect the bus with other components, but also increase the rigidity of the bus, resulting in cracking or even disconnection of the connection between the bus and other components connected to it when the battery cell expands, thereby reducing the reliability of the battery.

[0076] Based on the above technical problems, the present application provides a technical solution, which improves the current carrying capacity of the bus by setting a first connection layer and a second connection layer. In addition, the connection area of ​​the first connection layer and the second connection layer do not overlap in the thickness direction, which can reduce the stiffness of the bus connection area, so that when the battery cell expands, the connection area of ​​the bus can deform along with the deformation of other components, thereby reducing the possibility of cracking or even disconnection at the connection between the bus and other components, and improving the reliability of the battery.

[0077] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., among which spacecraft include airplanes, rockets, space shuttles and spacecraft, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0078] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0079] Please refer to Figure 1, which is a simple schematic diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 can be provided inside the vehicle 1000. For example, the battery 100 can be provided at the bottom, front or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery to power the motor 300, for example. The battery can be used for starting and navigating the vehicle 1000. Of course, the battery 100 can also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0080] Figure 2 is an exploded view of a battery according to some embodiments of the present application. As shown in Figure 2 , the battery 100 includes a housing 400 and battery cells (not shown), which are housed in the housing 400.

[0081] The housing 400 is used to house battery cells and can have various structures. In some embodiments, the housing 400 can include a first housing portion 410 and a second housing portion 420. The first housing portion 410 and the second housing portion 420 overlap each other and together define a receiving portion 430 for accommodating the battery cells. The second housing portion 420 can be a hollow structure with one end open. The first housing portion 410 is a plate-like structure, and the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing with the receiving portion 430. Alternatively, both the first housing portion 410 and the second housing portion 420 can be hollow structures with one end open. The open side of the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0082] In the battery 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell structure can be housed within the housing 400. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 500, and then the multiple battery modules 500 can be connected in series, in parallel, or in a hybrid configuration to form a single unit and housed within the housing 400.

[0083] FIG3 is a schematic structural diagram of the battery module 500 shown in FIG2 .

[0084] In some embodiments, as shown in FIG3 , there are multiple battery cells 10, and the multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel, or in a mixed connection to form a whole, and are housed in a box. The multiple battery cells 10 and the multiple battery modules 500 in FIG3 are connected in series, in parallel, or in a mixed connection via a busbar 40. Of course, an insulating plate (not shown in the figure) and a circuit board (not shown in the figure) disposed on the insulating plate are also provided between the battery module 500 and the busbar 40.

[0085] Figure 4 is a schematic diagram of the exploded structure of another battery provided in an embodiment of the present application. Figure 5 is a schematic diagram of the structure of a busbar provided in an embodiment of the present application. It should be noted that the battery cells are not shown in Figures 4 and 6.

[0086] Referring to Figures 3 to 5, an embodiment of the present application provides a battery. The battery includes an insulating plate 20, a circuit board 30, and a battery cell 10. The circuit board 30 is arranged on the insulating plate 20. Along the thickness direction X of the insulating plate 20, the battery cell 10 is arranged on one side of the insulating plate 20. An electrode terminal 11 is provided at one end of the battery cell 10 facing the insulating plate 20. A busbar 40 is arranged on the insulating plate 20, and the busbar 40 includes a first connecting layer 41, a second connecting layer 42, and a first bending layer 43 connecting the first connecting layer 41 and the second connecting layer 42. The first connecting layer 41 includes a main body area 411 and a connecting area 412. The main body area 411 overlaps with the second connecting layer 42 along the thickness direction X, and the connecting area 412 does not overlap with the second connecting layer 42 along the thickness direction X. The connecting area 412 is connected to at least one of the electrode terminal 11, the insulating plate 20, and the circuit board 30.

[0087] The battery cell 10 can be disposed on one side of the insulating plate 20 along the thickness direction X. The insulating plate 20 serves as a support component for the circuit board 30 and the busbar 40. The insulating plate 20 has a via hole through which the electrode terminals 11 are exposed, thereby enabling electrical connection between the busbar 40 and the electrode terminals 11. The insulating plate 20 can be provided with a recessed portion to provide space for accommodating at least a portion of the circuit board 30.

[0088] Optionally, the insulating plate 20 may be made of an insulating material. For example, the insulating plate 20 is made of rubber or plastic.

[0089] Optionally, the circuit board 30 may collect operating parameters of the battery cell 10 , such as voltage, temperature, etc.

[0090] Optionally, the busbar 40 may be made of a conductive material. For example, the busbar 40 may be made of a metal material, such as aluminum or copper.

[0091] Optionally, the number of the busbars 40 may include multiple busbars 40, and the multiple busbars 40 can connect the multiple battery cells 10 of the battery in series, in parallel, or in mixed connection.

[0092] As an example, a battery includes multiple battery cells 10, and the multiple battery cells 10 are arranged in series. The battery cells 10 include a positive electrode terminal 11 and a negative electrode terminal 11. The positive electrode terminal 11 of one of the two adjacent battery cells 10 is electrically connected to the negative electrode terminal 11 of the other battery cell 10 through a bus 40.

[0093] Optionally, the busbar 40 includes a first connection layer 41, a second connection layer 42, and a first bending layer 43. The surface of the first connection layer 41 and the surface of the second connection layer 42 can be bonded to each other to increase the cross-sectional area of ​​a portion of the busbar 40, thereby increasing the current flow capacity of the busbar 40. Furthermore, the surface of the main body region 411 and the surface of the second connection layer 42 can be bonded to each other.

[0094] Optionally, the first connection layer 41, the second connection layer 42 and the first bending layer 43 can be an integral structure. For example, the busbar 40 is a plate-shaped structure during the manufacturing process, and is bent along a bending axis to fit the first connection layer 41 and the second connection layer 42 together.

[0095] In the embodiment of the present application, the connection region 412 on the first connection layer 41 can be used to connect to one or more of the electrode terminal 11, the insulating plate 20, and the circuit board 30. For example, the connection region 412 includes three areas, each area being connected to a different component, for example, one area connected to the electrode terminal 11, one area connected to the insulating plate 20, and one area connected to the circuit board 30. Furthermore, the three areas can be connected to form a larger area, or at least two of the three areas can be separated by the main body area 411.

[0096] In the embodiment of the present application, the main body region 411 and the second connection layer 42 overlap along the thickness direction X, and the connection region 412 and the second connection layer 42 do not overlap along the thickness direction X. In other words, the overlapping region of the main body region 411 and the second connection layer 42 makes the overall thickness of this region of the busbar 40 greater than the overall thickness of the non-overlapping region of the connection region 412 and the second connection layer 42 along the thickness direction X. It should be noted that "overlap" refers to the overlapping relationship between entities.

[0097] In the battery provided in the embodiment of the present application, the current carrying capacity of the busbar 40 is improved by providing a first connection layer 41 and a second connection layer 42. In addition, the connection area 412 of the first connection layer 41 and the second connection layer 42 do not overlap along the thickness direction X, which can reduce the stiffness of the connection area 412 of the busbar 40. When the battery cell expands, the connection area 412 of the busbar 40 can deform along with the deformation of other components, thereby reducing the possibility of cracking or even disconnection at the connection between the busbar 40 and other components, thereby improving the reliability of the battery.

[0098] In some optional embodiments, referring to FIG. 5 , the second connection layer 42 is provided with an escape portion 421 exposing the connection region 412 .

[0099] Optionally, the projection area of ​​the first connection layer 41 along the thickness direction X may be the sum of the projection area of ​​the second connection layer 42 along the thickness direction X and the projection area of ​​the avoidance portion 421 along the thickness direction X.

[0100] In these optional embodiments, the avoidance portion 421 can reduce the thickness of the connection area 412, thereby reducing the stiffness of the busbar 40 in this area, so that when the battery cell expands, the connection area 412 of the busbar 40 can deform along with the deformation of other components, thereby reducing the possibility of cracking or even disconnection at the connection between the busbar 40 and other components, thereby improving the reliability of the battery.

[0101] In some optional embodiments, referring to FIG. 5 , the avoidance portion 421 includes a through hole, that is, a through hole may be opened on the second connection layer 42 to form the avoidance portion 421 .

[0102] Optionally, the shape of the avoidance portion 421 includes other shapes. For example, the avoidance portion 421 may extend from the boundary of the second connection layer 42 along the first direction into the second connection layer 42 , and the avoidance portion 421 is disposed throughout the second connection layer 42 , with the first direction intersecting the thickness direction X. For example, the projection of the avoidance portion 421 along the thickness direction X is a rectangle.

[0103] In these optional embodiments, the difficulty of manufacturing the second connection layer 42 can be reduced by penetrating the second connection layer 42 , thereby reducing the difficulty of manufacturing the busbar 40 .

[0104] In some alternative embodiments, referring to Figures 3 to 5, the connection region 412 includes a first connection portion 4121 electrically connected to the electrode terminal 11, a second connection portion 4122 electrically connected to the insulating plate 20, and a third connection portion 4123 electrically connected to the circuit board 30. The relief portion 421 includes a first relief portion 4211, a second relief portion 4212, and a third relief portion 4213, with at least two of the first relief portion 4211, the second relief portion 4212, and the third relief portion 4213 spaced apart from each other. The first connection portion 4121 and the first relief portion 4211 are correspondingly disposed along the thickness direction X, the second connection portion 4122 and the second relief portion 4212 are correspondingly disposed along the thickness direction X, and the third connection portion 4123 and the third relief portion 4213 are correspondingly disposed along the thickness direction X.

[0105] Optionally, the projected shape of the first connection portion 4121 along the thickness direction X can match the projected shape of the electrode terminal 11 along the thickness direction X. For example, if the projected shape of the electrode terminal 11 along the thickness direction X is rectangular, the projected shape of the first connection portion 4121 along the thickness direction X is also rectangular. Optionally, the projected area of ​​the first connection portion 4121 along the thickness direction X can be greater than or equal to the projected area of ​​the electrode terminal 11 along the thickness direction X.

[0106] Optionally, the second connection portion 4122 and the insulating plate 20 may be fixedly connected by means of clamping, bolts, riveting, or the like.

[0107] Optionally, the first connection portion 4121 , the second connection portion 4122 and the third connection portion 4123 may be spaced apart from each other, thereby reducing damage to other connection portions when different connection portions are connected to components connected thereto.

[0108] It should be noted that the "corresponding arrangement of the connection part and the avoidance part" refers to the correspondence in entity and space. As an example, the first connection part 4121 is exposed through the first avoidance part 4211, the second connection part 4122 is exposed through the second avoidance part 4212, and the third connection part 4123 is exposed through the third avoidance part 4213. Optionally, the shapes of the first avoidance part 4211, the second avoidance part 4212 and the third avoidance part 4213 can match the shape of the corresponding connection part. For example, the shape of the first connection part 4121 along the thickness direction X is a rectangle, and the shape of the first avoidance part 4211 along the thickness direction X is a rectangle. Optionally, the projection area of ​​the avoidance part 421 can be greater than or equal to the projection area of ​​the corresponding connection part. For example, the projection area of ​​the first avoidance part 4211 along the thickness direction X is greater than the projection area of ​​the first connection part 4121 along the thickness direction X.

[0109] In some examples, the first avoidance portion 4211 , the second avoidance portion 4212 , and the third avoidance portion 4213 are spaced apart from each other. In other examples, at least two of the first avoidance portion 4211 , the second avoidance portion 4212 , and the third avoidance portion 4213 are connected to form one avoidance portion 421 .

[0110] In these optional embodiments, while reducing the stiffness of the connection area 412 , the overall thickness of the busbar 40 is increased as much as possible, thereby increasing the current carrying capacity of the busbar 40 and improving the charging efficiency of the battery.

[0111] In some optional embodiments, referring to FIG. 3 and FIG. 5 , the first connection portion 4121 includes a conductive connection portion 4121 a and a positioning hole 4121 b . The positioning hole 4121 b is provided through the first connection portion 4121 . The conductive connection portion 4121 a is used to electrically connect to the electrode terminal 11 .

[0112] Optionally, the positioning hole 4121b can be set at the geometric center of the first connecting part 4121, and a mark can be set at the geometric center of the electrode terminal 11. The relative position between the first connecting part 4121 and the electrode terminal 11 can be observed through the positioning hole 4121b to reduce the manufacturing tolerance after the first connecting part 4121 and the electrode terminal 11 are fixedly connected, which is conducive to reducing the tolerance size of the first connecting part 4121, further increasing the area of ​​the overlapping area between the main area 411 and the second connecting layer 42, and thereby increasing the current flow capacity of the bus 40.

[0113] Optionally, the positioning hole 4121b includes one or more of a circular hole, a rectangular hole, a waist-shaped hole or an elliptical hole.

[0114] Figure 6 is a schematic top view of a battery according to an embodiment of the present application. Figure 7 is a schematic cross-sectional view of section AA in Figure 6. Figure 8 is an enlarged schematic view of section R in Figure 7.

[0115] In some optional embodiments, referring to Figures 6 to 8, the second connecting portion 4122 is provided with a connecting hole 4122a, the insulating plate 20 is provided with a protrusion 21, at least a portion of the protrusion 21 is disposed in the connecting hole 4122a, and the protrusion 21 is riveted to the connecting hole 4122a.

[0116] During the connection process between the insulating plate 20 and the second connecting part 4122, the protrusion 21 on the insulating plate 20 can have a preset height, and part of the protrusion 21 passes through the connecting hole 4122a and exceeds the surface of the second connecting part 4122 on the side facing away from the insulating plate 20. By riveting, part of the protrusion 21 is deformed and then covers the surface of the second connecting part 4122 on the side facing away from the insulating plate 20, so as to achieve a fixed connection between the insulating plate 20 and the second connecting part 4122.

[0117] Optionally, the number of connection holes 4122a may include multiple. As an example, multiple connection holes 4122a are provided in one second connection portion 4122. Alternatively, the number of second connection portions 4122 includes multiple, multiple second connection portions 4122 are arranged at intervals, and each second connection portion 4122 is provided with one or more connection holes 4122a.

[0118] In these optional embodiments, fixing the busbar 40 and the insulating plate 20 to each other by riveting can reduce the manufacturing difficulty, improve the connection reliability between the busbar 40 and the insulating plate 20, and reduce the possibility of separation between the busbar 40 and the insulating plate 20 due to vibration.

[0119] In some optional embodiments, referring to FIG. 6 to FIG. 8 , a surface of the protrusion 21 facing away from the insulation plate 20 is not higher than a surface of the second connection layer 42 facing away from the first connection layer 41 .

[0120] Optionally, the protrusion 21 includes a snap-fit ​​portion 212 and a main portion 211. The main portion 211 is located within the connection hole 4122a. The snap-fit ​​portion 212 covers the surface of the first connection layer 41 facing away from the insulating plate 20, and the snap-fit ​​portion 212 is spaced apart from the second connection layer 42. The arrangement of the surface of the snap-fit ​​portion 212 facing away from the insulating plate 20 being no higher than the surface of the second connection layer 42 facing away from the first connection layer 41 helps reduce the risk of interference between the protrusion 21 and other components, lowering the overall height of the connected insulating plate 20 and busbar 40, thereby reducing the height of the battery and improving its energy density.

[0121] Optionally, a surface of the protrusion 21 facing away from the insulation plate 20 is flush with a surface of the second connection layer 42 facing away from the first connection layer 41 .

[0122] Figure 9 is an enlarged structural diagram of Q in Figure 6. Figure 10 is an enlarged structural diagram of P in Figure 4.

[0123] In some optional embodiments, referring to Figures 9 and 10, the battery further includes a connector 50, the third connector 4123 is protruding relative to the first connector 4121 in a direction away from the first connector layer 41, the third connector 4123 is electrically connected to the circuit board 30 through the connector 50, and the connector 50 is arranged on the side of the third connector 4123 facing the second connector layer 42.

[0124] Alternatively, the connector 50 may be made of a conductive material, such as nickel.

[0125] The third connection portion 4123 is provided to protrude relative to the first connection portion 4121 in a direction away from the first connection layer 41. Optionally, the third connection portion 4123 is provided to protrude from the first connection portion 4121 in a direction toward the battery cell. Optionally, a similar protruding structure 22 may be provided on the insulating plate 20, protruding from other areas of the insulating plate 20 in a direction toward the battery cell, and the protruding structure 22 may abut against the outer shell of the battery cell.

[0126] Optionally, the third connecting portion 4123 and the connecting member 50 may be fixedly connected by welding.

[0127] Optionally, the surface of the connector 50 facing away from the first connection layer 41 is not higher than the surface of the second connection layer 42 facing away from the first connection layer 41, so as to reduce the size of the connector 50 occupied in the height direction of the battery. Optionally, the surface of the connector 50 facing away from the first connection layer 41 and the surface of the second connection layer 42 facing away from the first connection layer 41 are arranged flush.

[0128] In these optional embodiments, when the third connection portion 4123 and the connector 50 are fixedly connected, the battery cell can provide support for the third connection portion 4123 , thereby improving the connection reliability between the third connection portion 4123 and the connector 50 .

[0129] In some optional embodiments, please refer to Figure 5, the bus 40 includes a bending area A2 and two or more straight areas A1, the two or more straight areas A1 are arranged on both sides of the bending area A2, the bending area A2 is protruded from the straight area A1 in a direction away from the first connecting layer 41, and the first avoidance portion 4211 and the first connecting portion 4121 are arranged in the straight area A1.

[0130] Optionally, one busbar 40 may connect two battery cells in series. As an example, each straight area A1 is provided with a first connecting portion 4121 connected to one battery cell.

[0131] The bending area A2 is arranged to protrude from the straight area A1, that is, the bending area A2 protrudes toward the battery cell. It is understandable that two or more straight areas A1 are located in the first plane, and the bending area A2 is located in the second plane, and the straight areas A1 and the bending areas A2 can be connected by a transition arc.

[0132] Optionally, the stiffness of the bending area A2 may be smaller than the stiffness of the straight area A1.

[0133] In these optional embodiments, when the battery cell expands, the bending area A2 can be deformed to reduce the tension caused by the straight area A1 on the electrode terminal 11, thereby reducing the possibility of cracking at the connection between the first connecting portion 4121 in the straight area A1 and the electrode terminal 11, thereby improving the reliability of the busbar 40.

[0134] In some optional embodiments, referring to FIG. 5 , the second avoiding portion 4212 and the second connecting portion 4122 are at least disposed in the bending area A2 .

[0135] Optionally, the second connecting portion 4122 may also be provided in the straight area A1, and correspondingly, the second avoiding portion 4212 is also provided in the straight area A1.

[0136] In these optional embodiments, the second connecting portion 4122 is arranged in the bending area A2, so that the position of the busbar 40 on the insulating plate 20 is relatively fixed, thereby reducing the possibility of the relative position between the busbar 40 and the insulating plate 20 changing when the battery cell expands and contracts, thereby reducing the possibility of the busbar 40 separating from the insulating plate 20 or even interfering with other components.

[0137] FIG11 is a schematic structural diagram of another bus provided in an embodiment of the present application.

[0138] In some optional embodiments, referring to FIG. 11 , there are multiple second connection layers 42 , and the multiple second connection layers 42 are located on the same side of the first connection layer 41 .

[0139] Optionally, the plurality of second connection layers 42 all overlap with the main body region 411 along the thickness direction X.

[0140] Optionally, the gaps between the plurality of second connection layers 42 may form an avoidance portion 421 . Exemplarily, the two second connection layers 42 both have an opening shape, and the opening shapes of the two second connection layers 42 relatively form a first avoidance portion 4211 .

[0141] Optionally, the shapes of the plurality of second connection layers 42 may be the same, or may be different.

[0142] Optionally, the avoidance portion 421 may be provided on a portion of the second connection layers 42 among the plurality of second connection layers 42 , while the avoidance portion 421 may not be provided on another portion of the second connection layers 42 .

[0143] Optionally, the thicknesses of the plurality of second connection layers 42 may be the same, or may be different.

[0144] Optionally, each second connection layer 42 is connected to the first connection layer 41 through a first bending layer 43 .

[0145] As an example, the plurality of first bending layers 43 are disposed on one side of the first connection layer 41. Alternatively, the plurality of first bending layers 43 can also be disposed on different sides of the first connection layer 41, for example, on two opposite sides of the first connection layer 41 along a first direction intersecting the thickness direction X.

[0146] In these optional embodiments, by providing a plurality of second connection layers 42 , the avoidance portion 421 and the thickness of the second connection layer 42 can be arranged more flexibly, thereby increasing the applicability of the busbar 40 and reducing the difficulty of manufacturing the avoidance portion 421 .

[0147] In some optional embodiments, the second connection layer 42 is located on a side of the first connection layer 41 facing away from the battery cell 10 , thereby reducing the possibility of interference between the second connection layer 42 and the electrode terminal 11 .

[0148] In some optional embodiments, the main body area 411 and the second connection layer 42 are connected by conductive glue or welding, which is beneficial to reducing the resistance of the contact surface between the main body area 411 and the second connection layer 42, improving the current carrying capacity of the bus 40, and reducing the possibility of separation between the first connection layer 41 and the second connection layer 42.

[0149] Figure 12 is a schematic diagram of the structure of another bus provided in an embodiment of the present application. Figure 13 is a schematic diagram of the structure of another bus provided in an embodiment of the present application.

[0150] In some optional embodiments, referring to Figures 12 and 13 , the busbar 40 further includes a third connection layer 44 and a second bending layer 45 . One of the first connection layer 41 and the second connection layer 42 is connected to the third connection layer 44 via the second bending layer 45 , and the first connection layer 41 , the second connection layer 42 , and the third connection layer 44 are stacked along the thickness direction X. The connection region 412 does not overlap with the third connection layer 44 along the thickness direction X.

[0151] In some examples, as shown in FIG12 , the first connection layer 41 and the third connection layer 44 are connected via a second bending layer 45 . In other examples, as shown in FIG13 , the second connection layer 42 and the third connection layer 44 are connected via a second bending layer 45 .

[0152] Optionally, the first connection layer 41 , the second connection layer 42 and the third connection layer 44 are stacked in sequence along the thickness direction X.

[0153] Optionally, the avoidance portion 421 on the second connection layer 42 is also provided on the third connection layer 44 . In other words, the shape of the second connection layer 42 is the same as that of the third connection layer 44 .

[0154] Optionally, the busbar 40 may further include a fourth connection layer, a fifth connection layer, or more connection layers.

[0155] In these optional embodiments, the current capacity is further increased, the charging speed of the battery is improved, and the possibility of the bending layer being difficult to bend or even unable to be bent due to the single connecting layer being too thick is reduced.

[0156] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0157] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery in any of the aforementioned embodiments. For specific details, please refer to the aforementioned description of the beneficial effects of the battery, and the embodiment of the present application will not be repeated here.

[0158] According to some embodiments of the present application, referring to Figures 3 to 6 and Figures 8 to 10 , a battery includes an insulating plate 20, a circuit board 30, battery cells 10, and a busbar 40. The circuit board 30 is disposed on the insulating plate 20. Along the thickness direction X of the insulating plate 20, the battery cells 10 are disposed on one side of the insulating plate 20 along the thickness direction X. The ends of the battery cells 10 facing the insulating plate 20 are provided with electrode terminals 11. The busbar 40 is disposed on the insulating plate 20 and includes a first connecting layer 41, a second connecting layer 42, and a first bending layer 43 connecting the first connecting layer 41 and the second connecting layer 42. The first connecting layer 41 includes a main body region 411 and a connecting region 412. The main body region 411 overlaps with the second connecting layer 42 along the thickness direction X, while the connecting region 412 does not overlap with the second connecting layer 42 along the thickness direction X. The connecting region 412 is connected to the electrode terminal 11, the insulating plate 20, and the circuit board 30.

[0159] The second connection layer 42 has a relief portion 421 that exposes the connection area. The relief portion 421 includes a through-hole. The relief portion 421 includes a first relief portion 4211, a second relief portion 4212, and a third relief portion 4213. The connection area 412 includes a first connection portion 4121 electrically connected to the electrode terminal 11, a second connection portion 4122 connected to the insulating plate 20, and a third connection portion 4123 electrically connected to the circuit board 30. The first connection portion 4121 and the first relief portion 4211 are arranged in correspondence along the thickness direction X. The second connection portion 4122 and the second relief portion 4212 are arranged in correspondence along the thickness direction X. The third connection portion 4123 and the third relief portion 4213 are arranged in correspondence along the thickness direction X. The first connection portion 4121 includes a conductive connection portion 4121a and a positioning hole 4121b. The positioning hole 4121b is provided through the first connection portion 4121. The conductive connection portion 4121a is used to electrically connect to the electrode terminal 11. The second connecting portion 4122 is provided with a connecting hole 4122a. The insulating plate 20 is provided with a protrusion 21, at least partially disposed within the connecting hole 4122a, and the protrusion 21 is riveted to the connecting hole 4122a. The battery further includes a connector 50. The third connecting portion 4123 is provided to protrude relative to the first connecting portion 4121 in a direction away from the first connecting layer 41. The third connecting portion 4123 is electrically connected to the circuit board 30 via the connector 50. The connector 50 is disposed on the side of the third connecting portion 4123 facing the second connecting layer 42.

[0160] The busbar 40 includes a bending area A2 and two or more straight areas A1. The two or more straight areas A1 are arranged on both sides of the bending area A2. The bending area A2 protrudes from the straight area A1 in a direction away from the first connecting layer 41. The first avoidance portion 4211 and the first connecting portion 4121 are arranged in the straight area A1.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, wherein: include: Insulation panels; a circuit board, disposed on the insulating board; A battery cell, disposed on one side of the insulating plate along the thickness direction of the insulating plate, and having an electrode terminal disposed on one end of the battery cell facing the insulating plate; A busbar is arranged on the insulating plate, and the busbar includes a first connecting layer, a second connecting layer and a first bending layer connecting the first connecting layer and the second connecting layer. The first connecting layer includes a main body area and a connecting area. The main body area overlaps with the second connecting layer along the thickness direction, and the connecting area does not overlap with the second connecting layer along the thickness direction. The connecting area is connected to at least one of the electrode terminal, the insulating plate and the circuit board.

2. The battery according to claim 1, wherein The second connection layer is provided with an escape portion for exposing the connection area.

3. The battery according to claim 2, wherein The avoidance portion includes a through hole.

4. The battery according to claim 2, wherein The connection area includes a first connection portion electrically connected to the electrode terminal, a second connection portion electrically connected to the insulating plate, and a third connection portion electrically connected to the circuit board; The avoidance portion includes a first avoidance portion, a second avoidance portion, and a third avoidance portion, and at least two of the first avoidance portion, the second avoidance portion, and the third avoidance portion are arranged at intervals; The first connecting portion and the first avoiding portion are correspondingly arranged along the thickness direction, the second connecting portion and the second avoiding portion are correspondingly arranged along the thickness direction, and the third connecting portion and the third avoiding portion are correspondingly arranged along the thickness direction.

5. The battery according to claim 4, wherein The first connection portion includes a conductive connection portion and a positioning hole. The positioning hole is provided through the first connection portion. The conductive connection portion is used to be electrically connected to the electrode terminal.

6. The battery according to claim 4, wherein The second connecting portion is provided with a connecting hole, the insulating plate is provided with a protruding portion, at least a portion of the protruding portion is disposed in the connecting hole, and the protruding portion is riveted to the connecting hole.

7. The battery according to claim 6, wherein A surface of the protrusion facing away from the insulating plate is not higher than a surface of the second connection layer facing away from the first connection layer.

8. The battery according to claim 4, wherein The battery also includes a connector, the third connector is arranged to protrude relative to the first connector in a direction away from the first connector layer, the third connector is electrically connected to the circuit board through the connector, and the connector is arranged on a side of the third connector facing the second connector layer.

9. The battery according to claim 4, wherein The busbar includes a bending area and two or more straight areas, the two or more straight areas are arranged on both sides of the bending area, the bending area protrudes from the straight area in a direction away from the first connecting layer, and the first avoidance portion and the first connecting portion are arranged in the straight area.

10. The battery according to claim 9, wherein The second avoiding portion and the second connecting portion are at least arranged in the bending area.

11. The battery according to any one of claims 1 to 10, wherein: The number of the second connection layers includes multiple, and the multiple second connection layers are located on the same side of the first connection layer.

12. The battery according to any one of claims 1 to 10, wherein: The second connecting layer is located on a side of the first connecting layer facing away from the battery cell.

13. The battery according to any one of claims 1 to 10, wherein: The main body area and the second connection layer are connected by conductive glue or welding.

14. The battery according to any one of claims 1 to 10, wherein: The busbar also includes a third connecting layer and a second bending layer, one of the first connecting layer and the second connecting layer is connected to the third connecting layer through the second bending layer, and the first connecting layer, the second connecting layer and the third connecting layer are stacked along the thickness direction; the connection area and the third connecting layer do not overlap along the thickness direction.

15. An electrical device, wherein: The battery according to any one of claims 1 to 14 is used to provide electrical energy.

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