Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device includes a battery cell and a bus member. The battery cell includes an electrode terminal. The confluence component comprises a confluence main body and a conductive part, the confluence main body is welded to the electrode terminal, the base metal of the electrode terminal is the same as the base metal of the confluence main body, the confluence main body is provided with a concave part, the conductive part and the confluence main body are stacked and connected in the concave part, and the conductivity of the conductive part is larger than that of the confluence main body. The reliability of the battery device can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the reliability of battery devices has always been a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, the battery device comprising a battery cell and a busbar. The battery cell comprises an electrode terminal. The busbar comprises a busbar body and a conductive part connected to each other, the busbar body is welded to the electrode terminal, the base metal of the electrode terminal is the same as the base metal of the busbar body, the busbar body is provided with a recess, the conductive part is stacked with the busbar body and arranged in the recess, and the conductivity of the conductive part is greater than the conductivity of the busbar body.

[0006] In the above scheme, the base metal of the electrode terminal and the base metal of the busbar body are set to be the same, so as to improve the connection strength between the electrode terminal and the busbar body and reduce the difficulty of connecting the electrode terminal and the busbar body. By setting a recess on the busbar body, the thickness of the entire busbar component occupied by the conductive part is reduced, thereby reducing the overall thickness of the busbar body. By setting the conductive part, the overall current carrying capacity of the busbar component is improved, and the heat generated by the busbar component is reduced, thereby reducing the risk of thermal runaway of the battery device and improving the reliability of the battery device.

[0007] In some embodiments, an orthographic projection of the conductive portion on the busbar body and an orthographic projection of the electrode terminal on the busbar body are arranged to be non-overlapping.

[0008] In the above scheme, the above setting is helpful to improve the connection strength between the electrode terminal and the busbar body, reduce the possibility of a decrease in connection strength due to different materials, and reduce the possibility of increased difficulty in welding the electrode terminal and the busbar body due to excessive reflectivity of the conductive part.

[0009] In some embodiments, the busbar body includes a first connection area, a second connection area and a first transition area. The first connection area and the second connection area are connected through the first transition area. The first connection area is welded to the electrode terminal. The second connection area is used to electrically connect to an external electrical device. The conductive part is at least arranged in the second connection area.

[0010] In the above scheme, the above arrangement is helpful to improve the current carrying capacity of the current collecting component, reduce the influence of the conductive part on the welding of the electrode terminal and the first connecting area, and improve the connection strength between the electrode terminal and the first connecting area.

[0011] In some embodiments, the first transition region is bent relative to at least one of the first connection region and the second connection region.

[0012] In the above scheme, through the above arrangement, a part of the structure of the busbar component can be bent in any direction to reduce the possibility of interference between the busbar component and other structures, while reducing the space occupied by the busbar component and improving the energy density of the battery device.

[0013] In some embodiments, the first transition region is bent relative to the second connection region, and a bending point where the first transition region and the second connection region are connected is spaced apart from an edge of the conductive portion.

[0014] In the above scheme, the above arrangement is helpful to reduce the possibility of the conductive part and the second connection area being separated due to the bending stress during the bending process of the first transition area, thereby improving the manufacturing yield of the busbar component.

[0015] In some embodiments, the second connection area is provided with a mounting hole, and the mounting hole is provided through the conductive portion.

[0016] In the above scheme, by providing a mounting hole, it is helpful to simplify the connection method between the busbar component and the external electrical equipment. The mounting hole passes through the conductive part, so that the bolts, pins or other fixing structures through the mounting hole can disperse the shear force and external impact to the conductive part and the busbar body, thereby reducing the risk of damage to the structure around the mounting hole and causing separation of the busbar component from the external electrical equipment.

[0017] In some embodiments, a recess is provided in the second connection region, and a surface of the conductive portion facing away from the recess along the thickness direction of the busbar component is flush with an outer surface of the second connection region.

[0018] In the above scheme, the surface of the side of the conductive part facing away from the recess is arranged flush with the outer surface of the second connection area so that the surface of the area where the second connection area is located in the busbar component is flush, thereby reducing the possibility of a gap between the conductive part and the external electrical equipment due to the step difference between the conductive part and the busbar body, thereby reducing the resistance between the busbar component and the external electrical equipment and improving the input and output efficiency.

[0019] In some embodiments, the recess is disposed on a side of the second connection region facing the side for electrically connecting to an external electrical device.

[0020] In the above scheme, the groove is arranged on the side facing the electrical connection with the external electrical device, so that the conductive part in the groove can be directly electrically connected to the connection structure of the external electrical device, thereby reducing the heat generated by the second connection area and the conductive part, thereby reducing the risk of thermal runaway of the battery device and improving the reliability of the battery device.

[0021] In some embodiments, recesses are provided on opposite sides of the second connection region along the thickness direction.

[0022] In the above scheme, the above arrangement is helpful to increase the overall current carrying capacity of the busbar component, further improve the reliability of the battery device, increase the arrangement space of the conductive part, and improve the flexibility of the arrangement of the conductive part in the busbar component.

[0023] In some embodiments, the conductive part includes a first conductive part and a second conductive part. The first conductive part is arranged on the side of the bus body facing the side for electrical connection with the external electrical device, and the second conductive part is arranged on the side of the bus body facing away from the side for electrical connection with the external electrical device. The thickness of the second conductive part is less than the thickness of the first conductive part.

[0024] In the above scheme, by setting the thickness of the second conductive part to be smaller than the thickness of the first conductive part, the current carrying capacity of the first conductive part can be improved. Since the first conductive part is in direct contact with the external electrical equipment, the heat generated by the first conductive part can be reduced, thereby reducing the risk of the busbar component melting due to excessive heat, thereby increasing the service life of the battery device and improving the output power of the battery device.

[0025] In some embodiments, the busbar component includes a first connection area, a third connection area and a second transition area, the first connection area and the third connection area are connected through the second transition area, the number of battery cells includes multiple, the first connection area and the third connection area are electrically connected to the electrode terminals of at least two battery cells respectively, and the conductive part is arranged in the second transition area.

[0026] In the above solution, by arranging the conductive part in the second transition zone, it is helpful to reduce the influence of the conductive part on the welding between the busbar component and the electrode terminal, and improve the overall current carrying capacity of the busbar component.

[0027] In some embodiments, the second transition region is bent relative to at least one of the first connection region and the third connection region.

[0028] In the above scheme, the battery cell will expand during operation, resulting in an increase in the distance between the electrode terminals on the two battery cells connected by the busbar component. The bending parts of the second transition area, the first connection area and the third connection area are stretched when the battery cell expands, thereby playing a buffering role and reducing the possibility of the busbar component being pulled, cracked or even broken when the battery cell expands.

[0029] In some embodiments, the base metal of the busbar body includes aluminum and the base metal of the conductive portion includes copper.

[0030] In the above scheme, by setting the base metal of the busbar body to aluminum, it is helpful to reduce the overall cost and overall weight of the busbar component; by setting the base metal of the conductive part to copper, it is helpful to improve the overall current carrying capacity of the busbar component.

[0031] In some embodiments, the overall volume of the busbar component is V, the volume of the conductive portion is v, and v and V satisfy the relationship: 0.2≤v / V≤0.4.

[0032] In the above scheme, by limiting v / V to be greater than or equal to 0.2, the flow capacity of the entire collection component is improved; by limiting v / V to be less than or equal to 0.4, the preparation cost of the entire collection component is reduced.

[0033] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device in any of the aforementioned embodiments, and the battery device 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 drawings required for use in the embodiments of the present application will be briefly introduced below. 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 these drawings without creative work.

[0036] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of an exploded structure of a battery device provided in an embodiment of the present application;

[0038] Figure 3is a schematic diagram of an exploded structure of a battery module provided in an embodiment of the present application;

[0039] Figure 4 is a structural schematic diagram of a battery module provided in an embodiment of the present application;

[0040] Figure 5 is a schematic structural diagram of a current collecting component in a battery device provided in an embodiment of the present application;

[0041] Figure 6 is a structural schematic diagram of another battery device provided in an embodiment of the present application;

[0042] Figure 7 is a structural schematic diagram of a current collecting component in another battery device provided in an embodiment of the present application;

[0043] Figure 8 is a structural schematic diagram of a current collecting component in another battery device provided in an embodiment of the present application;

[0044] Fig. 9 is a structural schematic diagram of a current collecting component in another battery device provided in an embodiment of the present application;

[0045] Fig.10 It is a schematic structural diagram of a current collecting component in another battery device provided in an embodiment of the present application.

[0046] Marking Description

[0047] 1000. Vehicles;

[0048] 100, battery device; 200, controller; 300, motor; 400, housing; 410, first housing portion; 420, second housing portion; 430, storage portion; 500, battery module;

[0049] 10. Battery cell; 11. Electrode terminal;

[0050] 20. busbar component; 21. busbar body; 211. first connection area; 212. second connection area; 213. first transition area; 214. third connection area; 215. second transition area; 22. conductive part; 221. first conductive part; 222. second conductive part; 23. connector; 24. output part;

[0051] H, mounting hole; R, recess;

[0052] Z, thickness direction. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0055] 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 clearly and specifically defined.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] 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).

[0059] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] 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.

[0062] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0063] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0064] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0065] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0066] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0067] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0068] 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.

[0069] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0070] The battery device includes a battery cell, which is electrically connected to an external electrical device or an external circuit through a busbar. The battery device may include multiple battery cells, and multiple battery cells can increase the capacity and output voltage of the battery device. However, the overcurrent capacity of the busbar limits the output voltage, resulting in more heat generated by the busbar when the electrical device requires more power, increasing the risk of thermal runaway of the battery device and reducing the reliability of the battery device.

[0071] Based on the above technical problems, the present application provides a technical solution, which improves the connection strength between the electrode terminal and the busbar body and reduces the difficulty of connecting the electrode terminal and the busbar body by setting the base metal of the electrode terminal and the busbar body to be the same. By setting the conductive part, the overall current capacity of the busbar component is improved, and the heat generated by the busbar component is reduced, thereby reducing the risk of thermal runaway of the battery device and improving the reliability of the battery device.

[0072] 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, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, 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.

[0073] 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 examples.

[0074] See also Figure 1 , Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0075] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000, and specifically, for example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000, and of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0076] Figure 2 Schematic diagram of the explosion structure of a battery device provided in an embodiment of the present application. Figure 2 As shown, the battery device 100 includes a box body 400 and a battery cell (not shown in the figure), and the battery cell is accommodated in the box body 400.

[0077] The box 400 is used to accommodate the battery cell, and the box 400 can be a variety of structures. In some embodiments, the box 400 may include a first box portion 410 and a second box portion 420, the first box portion 410 and the second box portion 420 cover each other, and the first box portion 410 and the second box portion 420 jointly define a receiving portion 430 for accommodating the battery cell. The second box portion 420 may be a hollow structure with one end open, the first box portion 410 is a plate-like structure, and the first box portion 410 covers the open side of the second box portion 420 to form a box with a receiving portion 430; the first box portion 410 and the second box portion 420 may also be a hollow structure with one side open, and the open side of the first box portion 410 covers the open side of the second box portion 420 to form a box 400 with a receiving portion 430. Of course, the first box portion 410 and the second box portion 420 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0078] In the battery device 100, there can be one or more battery cells. If there are more than one battery cell, the battery cells can be connected in series, in parallel or in a mixed connection. A mixed connection means that the battery cells are connected in series and in parallel. The battery cells can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the battery cells can be accommodated in the box 400; of course, the battery module 500 can also be formed by connecting the battery cells in series, in parallel or in a mixed connection, and then the battery modules 500 can be connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 400.

[0079] Figure 3 It is a schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application.

[0080] In some embodiments, Figure 3 As shown, there are multiple battery cells 10, and the multiple battery cells 10 are first connected in series, in parallel, or in mixed series to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in a box.

[0081] Figure 4 It is a structural schematic diagram of a battery module provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the structure of a busbar component in a battery device provided in an embodiment of the present application. Figure 6 It is a structural schematic diagram of another battery device provided in an embodiment of the present application. Figure 7 It is a schematic structural diagram of a current collecting component in another battery device provided in an embodiment of the present application.

[0082] See also Figures 3 to 7 The embodiment of the present application provides a battery device 100, which includes a battery cell 10 and a busbar component 20. The battery cell 10 includes an electrode terminal 11. The busbar component 20 includes a busbar body 21 and a conductive part 22 connected to each other, the busbar body 21 is welded to the electrode terminal 11, the base metal of the electrode terminal 11 is the same as the base metal of the busbar body 21, the busbar body is provided with a recess, the conductive part 22 is stacked with the busbar body 21 and is arranged in the recess, and the conductivity of the conductive part 22 is greater than the conductivity of the busbar body 21.

[0083] Optionally, the electrode terminal 11 of the battery cell 10 may include a positive electrode terminal 11 and a negative electrode terminal 11 , and the number of the battery cell 10 may include multiple battery cells, and the multiple battery cells 10 may be connected in series, in parallel, or in mixed connection through the busbar component 20 .

[0084] Exemplarily, the busbar component 20 includes a connector 23 and an output member 24, and a plurality of battery cells 10 are connected in series, in parallel, or in mixed connection through the connector 23. After the plurality of battery cells 10 are connected to each other, the electrode terminal 11 of the battery cell 10 located on the outermost side is electrically connected to the output member 24, and the output member 24 can electrically connect the battery cell 10 to an external device. Optionally, the output member 24 includes a positive output member 24 and a negative output member 24. The positive output member 24 is electrically connected to the positive electrode terminal 11 of the battery cell 10, and the negative output member 24 is electrically connected to the negative electrode terminal 11 of the battery cell 10.

[0085] In some examples, the connector 23 may include a busbar body 21 and a conductive portion 22. In other examples, the output member 24 may include a busbar body 21 and a conductive portion 22. In other examples, both the connector 23 and the output member 24 include a busbar body 21 and a conductive portion 22.

[0086] Optionally, the busbar body 21 may be welded to the electrode terminal 11 by laser welding or the like.

[0087] It is understood that the base metal refers to the main component of the material in an object, for example, the base metal of the electrode terminal 11 refers to the main component of the material in the electrode terminal 11. The base metal of the busbar body 21 refers to the main component of the material in the busbar body 21.

[0088] Optionally, the conductive part 22 is stacked and connected with the busbar body 21, and the "connection" here means that the conductive part 22 is electrically connected with the busbar body 21. The busbar body 21 can be a plate-like structure, and the thickness direction Z of the busbar component 20 can be the stacking direction of the conductive part 22 and the busbar body 21. Optionally, the conductive part 22 can be a plate-like structure.

[0089] It can be understood that electrical conductivity refers to the electrical conductivity of a material, the electrical conductivity of the conductive portion 22 refers to the electrical conductivity of the base metal of the conductive portion 22, and the electrical conductivity of the busbar body 21 refers to the electrical conductivity of the base metal of the busbar body 21. The electrical conductivity of the conductive portion 22 being greater than the electrical conductivity of the busbar body 21 can be understood as the current carrying capacity of the conductive portion 22 being greater than the current carrying capacity of the busbar body 21, so as to improve the overall current carrying capacity of the busbar component 20.

[0090] Optionally, the number of the recess R may include one or more.

[0091] Exemplarily, when there are multiple recesses R, the number of the conductive portions 22 and the number of the recesses R are arranged in a one-to-one correspondence.

[0092] Optionally, the conductive part 22 and the busbar body 21 can be prepared by a rolling process. For example, when the base metal of the conductive part 22 is liquid and the base metal of the busbar body 21 is solid, the liquid conductive part material is arranged in a recess of the busbar body, and pressure is applied to the conductive part material by a rolling device, so that the conductive part material is squeezed and combined with the busbar body. After the rolling is completed, the busbar component is cooled to ensure that the liquid conductive part material is completely solidified and firmly combined with the busbar body. Optionally, the rolling process may include hot rolling.

[0093] In the embodiment of the present application, the base metal of the electrode terminal 11 and the base metal of the busbar body 21 are set to be the same, so as to improve the connection strength between the electrode terminal 11 and the busbar body 21 and reduce the connection difficulty between the electrode terminal 11 and the busbar body 21. By setting a recess on the busbar body, the thickness of the entire busbar component occupied by the conductive part is reduced, thereby reducing the overall thickness of the busbar body. By setting the conductive part 22, the overall current capacity of the busbar component 20 is improved, and the heat generated by the busbar component 20 is reduced, thereby reducing the risk of thermal runaway of the battery device 100 and improving the reliability of the battery device 100.

[0094] In some optional embodiments, see Figures 3 to 7 The orthographic projection of the conductive portion 22 on the busbar body 21 and the orthographic projection of the electrode terminal 11 on the busbar body 21 are arranged not to overlap.

[0095] In other words, there is no overlapping area between the orthographic projection of the conductive part 22 on the busbar body 21 and the orthographic projection of the electrode terminal 11 on the busbar body 21. Optionally, the conductive part 22 is located on the side of the busbar body 21 facing the electrode terminal 11, and the conductive part 22 is not in contact with the electrode terminal 11. Optionally, the conductive part 22 is located on the side of the busbar body 21 facing away from the electrode terminal 11, and the conductive part 22 is not arranged above the electrode terminal 11.

[0096] In the embodiment of the present application, the above-mentioned arrangement is helpful to improve the connection strength between the electrode terminal 11 and the busbar body 21, reduce the possibility of a decrease in connection strength due to different materials, and reduce the possibility of increased difficulty in welding the electrode terminal 11 and the busbar body 21 due to excessive reflectivity of the conductive part 22.

[0097] In some optional embodiments, see Figures 3 to 7 The busbar body 21 includes a first connection area 211, a second connection area 212 and a first transition area 213. The first connection area 211 and the second connection area 212 are connected through the first transition area 213. The first connection area 211 is welded to the electrode terminal 11, and the second connection area 212 is used for electrical connection with an external electrical device. The conductive part 22 is at least arranged in the second connection area 212.

[0098] The second connection area 212 can electrically connect the electrode terminal 11 connected to the first connection area 211 to an external electrical device. The busbar body 21 may include a plurality of first connection portions, which are connected to the second connection area 212 via the first transition area 213. Optionally, the busbar body 21 of the output member 24 includes a first connection area 211, a second connection area 212, and a first transition area 213.

[0099] Alternatively, if Figure 5As shown, the conductive portion 22 may cover a portion of the second connection region 212. Alternatively, the conductive portion 22 may cover the entire second connection region 212.

[0100] Alternatively, if Figure 7 As shown, the conductive portion 22 may also be disposed in the first transition region 213. For example, the conductive portion 22 is disposed in the first transition region 213 and the second connection region 212. Optionally, the conductive portion 22 may cover a portion of the first transition region 213. Alternatively, the conductive portion 22 may cover the entire first transition region 213.

[0101] In the embodiment of the present application, the above-mentioned configuration is beneficial to improving the current carrying capacity of the busbar component 20 while reducing the influence of the conductive part 22 on the welding of the electrode terminal 11 and the first connection area 211, thereby improving the connection strength between the electrode terminal 11 and the first connection area 211.

[0102] In some optional embodiments, see Figure 5 and Figure 7 The first transition area 213 is bent relative to at least one of the first connection area 211 and the second connection area 212 .

[0103] In some embodiments, the first transition region 213 is bent relative to the first connection region 211, that is, one end of the first transition region 213 is connected to the first connection region 211, and a bent structure is formed at the connection. In other embodiments, the first transition region 213 is bent relative to the second connection region 212, that is, one end of the first transition region 213 is connected to the second connection region 212, and a bent structure is formed at the connection.

[0104] In some other embodiments, the first transition zone 213 is bent relative to the first connection zone 211, and the first transition zone 213 is bent relative to the second connection zone 212, that is, there is a bending structure between the first transition zone 213 and the first connection zone 211, and there is a bending structure between the first transition zone 213 and the second connection zone 212. Exemplarily, the plane where the first connection zone 211 is located is parallel to the plane where the second connection zone 212 is located, and the plane where the first transition zone 213 is located intersects with the plane where the first connection zone 211 is located.

[0105] In the embodiment of the present application, through the above arrangement, a part of the structure of the busbar component 20 can be bent in any direction to reduce the possibility of interference between the busbar component 20 and other structures, while reducing the space occupied by the busbar component 20 and improving the energy density of the battery device 100.

[0106] In some optional embodiments, see Figure 5 and Figure 7The first transition region 213 is bent relative to the second connection region 212 , and the bending point where the first transition region 213 and the second connection region 212 are connected is spaced apart from the edge of the conductive portion 22 .

[0107] The bending point where the first transition area 213 and the second connection area 212 are connected can be understood as the area where the first transition area 213 and the second connection area 212 are connected will form a bending structure after bending around the bending axis. The shape of the bending structure is arc-shaped. There is a gap between the edge of the arc and the edge of the conductive part 22.

[0108] In the embodiment of the present application, the above arrangement is helpful to reduce the possibility of the conductive portion 22 and the second connection region 212 being separated due to the bending stress during the bending process of the first transition region 213 , thereby improving the manufacturing yield of the busbar component 20 .

[0109] In some optional embodiments, see Figure 5 and Figure 7 The second connection area 212 is provided with a mounting hole H, and the mounting hole passes through the conductive portion 22 .

[0110] Optionally, the mounting hole H can fix the busbar component 20 and an external electrical device together.

[0111] Optionally, the mounting hole H is provided through the conductive portion 22 and the busbar body 21 .

[0112] In the embodiment of the present application, the installation hole H is provided to simplify the connection method between the busbar component 20 and the external electrical equipment. The installation hole H passes through the conductive part 22, so that the bolt, pin or other fixing structure through the installation hole H can disperse the shear force and external impact to the conductive part 22 and the busbar body 21, thereby reducing the risk of damage to the structure around the installation hole H, resulting in separation of the busbar component 20 from the external electrical equipment.

[0113] Figure 8 It is a schematic structural diagram of a current collecting component in another battery device provided in an embodiment of the present application.

[0114] In some optional embodiments, see Figure 5 , Figure 7 as well as Figure 8 The second connection area 212 is provided with a recess R, the conductive part 22 is arranged in the recess R, and the side surface of the conductive part 22 facing away from the recess R along the thickness direction Z of the busbar component 20 is flush with the outer surface of the second connection area 212.

[0115] The surface of the conductive portion 22 facing away from the recess R along the thickness direction Z of the busbar component 20 is flush with the outer surface of the second connection area 212 , where “outer surface” refers to the outer surface of the second connection area along the thickness direction.

[0116] In these optional embodiments, the surface of the side of the conductive part 22 facing away from the recess R is set flush with the outer surface of the second connection area 212 so that the surface of the area where the second connection area 212 is located in the busbar component 20 is flush, thereby reducing the possibility of a gap between the conductive part 22 and the external electrical equipment due to the step difference between the conductive part 22 and the busbar body 21, thereby reducing the resistance between the busbar component 20 and the external electrical equipment and improving the input and output efficiency.

[0117] In some optional embodiments, see Figure 5 The recess is arranged on a side of the second connection area facing the side for electrical connection with an external electrical device.

[0118] It can be understood that the groove is arranged on the side facing the electrical connection with the external electrical device, so that the conductive part in the groove can be directly electrically connected to the connection structure of the external electrical device, thereby reducing the heat generated by the second connection area and the conductive part, and further reducing the risk of thermal runaway of the battery device, thereby improving the reliability of the battery device.

[0119] In some optional embodiments, see Figure 7 and Figure 8 , recesses R are provided on two opposite sides of the second connection area 212 along the thickness direction Z.

[0120] Optionally, the projections of the recesses R on the two opposite sides of the second connection area 212 along the thickness direction Z along the thickness direction Z completely overlap; or they may overlap in part and not in the other part; of course, the recesses R on both sides may also not overlap at all.

[0121] It can be understood that the conductive parts 22 are provided in the recesses R on both sides. Optionally, the materials of the conductive parts 22 in the recesses R on both sides can be the same or different.

[0122] Optionally, a channel may be provided between the recesses R on both sides to connect the recesses R on both sides, so that the conductive parts 22 in the recesses on both sides are connected.

[0123] Optionally, the recessed depths of the recessed portions R on both sides may be the same, or may be different.

[0124] Optionally, the recessed areas of the recesses R on both sides may be the same, or may be different.

[0125] In the embodiment of the present application, the above-mentioned configuration is helpful to increase the overall current carrying capacity of the busbar component 20, further improve the reliability of the battery device 100, increase the arrangement space of the conductive part 22, and improve the flexibility of the arrangement of the conductive part 22 in the busbar component 20.

[0126] Fig. 9 It is a schematic structural diagram of a current collecting component in another battery device provided in an embodiment of the present application.

[0127] In some optional embodiments, see Fig. 9 The conductive part 22 includes a first conductive part 221 and a second conductive part 222. The first conductive part 221 is arranged on the side of the bus body 21 facing the side for electrical connection with the external electrical equipment, and the second conductive part 222 is arranged on the side of the bus body 21 facing away from the side for electrical connection with the external electrical equipment. The thickness of the second conductive part 222 is less than the thickness of the first conductive part 221.

[0128] In other words, the first conductive part 221 can be used to directly contact with external electrical equipment, and the second conductive part 222 can be electrically connected to the external electrical equipment through the busbar body 21 and the first conductive part 221. The first conductive part 221 and the second conductive part 222 are respectively located in the concave parts R on both sides of the second connection area 212 opposite to each other along the thickness direction Z.

[0129] In the embodiment of the present application, by setting the thickness of the second conductive part 222 to be smaller than the thickness of the first conductive part 221, the current carrying capacity of the first conductive part 221 can be improved. Since the first conductive part 221 is in direct contact with the external electrical equipment, the heat generated by the first conductive part 221 can be reduced, thereby reducing the risk of the busbar component 20 melting due to excessive heat, thereby increasing the service life of the battery device 100 and increasing the output power of the battery device 100.

[0130] Fig.10 This is a schematic diagram of the structure of a current collecting component in another battery device provided in an embodiment of the present application.

[0131] In some optional embodiments, see Figure 3 , Figure 6 as well as Fig.10 The busbar component 20 includes a first connection area 211, a third connection area 214 and a second transition area 215. The first connection area 211 and the third connection area 214 are connected through the second transition area 215. The number of battery cells 10 includes multiple. The first connection area 211 and the third connection area 214 are respectively electrically connected to the electrode terminals 11 of at least two battery cells 10, and the conductive part 22 is arranged in the second transition area 215.

[0132] Optionally, the number of the first connection regions 211 may include a plurality.

[0133] Optionally, the number of the third connection regions 214 may include a plurality.

[0134] Exemplarily, the plurality of first connection regions 211 and the plurality of third connection regions 214 are connected via a second transition region 215 .

[0135] Optionally, the connection member 23 may include a first connection area 211 , a third connection area 214 and a second transition area 215 .

[0136] Optionally, the connector 23 may connect two adjacent battery cells 10 , and of course, may also connect two non-adjacent battery cells 10 .

[0137] Optionally, the first connection region 211 may be welded to the electrode terminal 11 of one battery cell 10 , and the third connection region 214 may be welded to the electrode terminal 11 of another battery cell 10 .

[0138] In these optional embodiments, by disposing the conductive portion 22 in the second transition zone 215 , it is helpful to reduce the influence of the conductive portion 22 on the welding between the busbar component 20 and the electrode terminal 11 , thereby improving the overall current carrying capacity of the busbar component 20 .

[0139] In some optional embodiments, see Fig.10 The second transition zone 215 is bent relative to at least one of the first connection zone 211 and the third connection zone 214 .

[0140] In some embodiments, the second transition region 215 is bent relative to the first connection region 211. In other embodiments, the second transition region 215 is bent relative to the third connection region 214. In other embodiments, the second transition region 215 is bent relative to both the first connection region 211 and the third connection region 214.

[0141] In these optional embodiments, the battery cells expand during operation, causing the spacing between the electrode terminals on the two battery cells connected by the busbar to increase, and the bends of the second transition zone 215 and the first connection zone 211 and the third connection zone 214 are stretched when the battery cells expand, thereby playing a buffering role and reducing the possibility of the busbar being pulled, cracked or even broken when the battery cells expand.

[0142] In some optional embodiments, the base metal of the busbar body 21 includes aluminum, and the base metal of the conductive part 22 includes copper.

[0143] In the embodiment of the present application, by setting the base metal of the busbar body 21 to aluminum, it is helpful to reduce the overall cost of the busbar component 20 and the overall weight of the busbar component 20; by setting the base metal of the conductive part 22 to copper, it is helpful to improve the overall current carrying capacity of the busbar component 20.

[0144] In some optional embodiments, the overall volume of the busbar component 20 is V, the volume of the conductive portion 22 is v, and v and V satisfy the relationship: 0.2≤v / V≤0.4.

[0145] Exemplarily, v and V satisfy the relationship of v / V=0.2, v / V=0.25, v / V=0.3, v / V=0.35 or v / V=0.4.

[0146] In the embodiment of the present application, v / V is limited to be greater than or equal to 0.2 to improve the overall flow capacity of the runner component 20; v / V is limited to be less than or equal to 0.4 to reduce the overall preparation cost of the runner component 20.

[0147] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device in any of the aforementioned embodiments, and the battery device is used to provide electrical energy.

[0148] According to some embodiments of the present application, please refer to Figures 3 to 10 The battery device 100 includes a battery cell 10 and a busbar component 20. The battery cell includes an electrode terminal 11. The busbar component 20 includes a busbar body 21 and a conductive part 22 connected to each other. The busbar body is welded to the electrode terminal 11. The base metal of the electrode terminal is the same as the base metal of the busbar body 21. The busbar body is provided with a recess. The conductive part 22 is stacked with the busbar body 21 and arranged in the recess. The conductivity of the conductive part 22 is greater than the conductivity of the busbar body 21. The orthographic projection of the conductive part 22 on the busbar body 21 and the orthographic projection of the electrode terminal 11 on the busbar body 21 are not overlapped.

[0149] The busbar body 21 includes a first connection area 211, a second connection area 212 and a first transition area 213. The first connection area 211 and the second connection area 212 are connected through the first transition area 213. The first connection area 211 is welded to the electrode terminal 11, and the second connection area 212 is used to electrically connect to an external electrical device. The conductive part 22 is at least arranged in the second connection area 212. The first transition area 213 is bent relative to the first connection area 211 and the second connection area 212. The second connection area is provided with a mounting hole H, and the mounting hole is arranged through the conductive part 22. The second connection area 212 is provided with a recess R on both sides opposite to each other along the thickness direction Z. The base metal of the busbar body 21 includes aluminum, and the base metal of the conductive part 22 includes copper.

[0150] 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 replace some or all of the technical features therein by equivalents; 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 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 device, characterized in that: include: A battery cell including electrode terminals; A busbar component includes a busbar body and a conductive part connected to each other, wherein the busbar body is welded to the electrode terminal, the base metal of the electrode terminal is the same as the base metal of the busbar body, the busbar body is provided with a recess, the conductive part is stacked with the busbar body and arranged in the recess, and the conductivity of the conductive part is greater than the conductivity of the busbar body.

2. The battery device according to claim 1, characterized in that: The orthographic projection of the conductive portion on the busbar body and the orthographic projection of the electrode terminal on the busbar body are arranged not to overlap.

3. The battery device according to claim 1, characterized in that: The busbar body includes a first connection area, a second connection area and a first transition area. The first connection area and the second connection area are connected through the first transition area. The first connection area is welded to the electrode terminal. The second connection area is used for electrical connection with an external electrical device. The conductive part is at least arranged in the second connection area.

4. The battery device according to claim 3, characterized in that: The first transition area is bent relative to at least one of the first connection area and the second connection area.

5. The battery device according to claim 4, characterized in that: The first transition region is bent relative to the second connection region, and a bending point where the first transition region and the second connection region are connected is spaced apart from an edge of the conductive portion.

6. The battery device according to claim 3, characterized in that: The second connection area is provided with a mounting hole, and the mounting hole is arranged through the conductive part.

7. The battery device according to claim 3, characterized in that: The second connection area is provided with the recess, and a surface of the conductive portion facing away from the recess along the thickness direction of the busbar component is flush with an outer surface of the second connection area.

8. The battery device according to claim 3, characterized in that: The recess is arranged on a side of the second connection area facing the side for electrical connection with an external electrical device.

9. The battery device according to claim 3, characterized in that: The recesses are disposed on two opposite sides of the second connection area along the thickness direction.

10. The battery device according to claim 9, characterized in that: The conductive part includes a first conductive part and a second conductive part. The first conductive part is arranged on the side of the bus body facing the side for electrical connection with the external electrical device, and the second conductive part is arranged on the side of the bus body facing away from the side for electrical connection with the external electrical device. The thickness of the second conductive part is less than the thickness of the first conductive part.

11. The battery device according to claim 1, characterized in that: The busbar body includes a first connection area, a third connection area and a second transition area, the first connection area and the third connection area are connected through the second transition area, the number of the battery cells includes multiple, the first connection area and the third connection area are respectively electrically connected to the electrode terminals of at least two of the battery cells, and the conductive part is arranged in the second transition area.

12. The battery device according to claim 11, characterized in that: The second transition area is bent relative to at least one of the first connection area and the third connection area.

13. The battery device according to claim 1, characterized in that: The base metal of the busbar body includes aluminum, and the base metal of the conductive part includes copper.

14. The battery device according to claim 1, characterized in that: The overall volume of the busbar component is V, the volume of the conductive portion is v, and v and V satisfy the relationship: 0.2≤v / V≤0.

4.

15. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 14, wherein the battery device is used to provide electrical energy.

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