Battery device and electric device

Abstract

This application relates to the field of battery technology and discloses a battery device and an electrical device. The battery device includes a busbar component, multiple battery cells, a temperature detector, and a controller. The busbar component includes a first busbar sub-component, a second busbar sub-component, a first connecting sub-component, and a second connecting sub-component. The first and second busbar sub-components are spaced apart along a first direction and are respectively connected to different battery cells. The first and second connecting sub-components are both connected between the first and second busbar sub-components. The first connecting sub-component is configured to disconnect when subjected to a tensile force greater than or equal to a first threshold, and the second connecting sub-component is configured to disconnect when subjected to a tensile force greater than or equal to a second threshold. The first threshold is greater than the second threshold. The temperature detector is used to detect the temperature value of the busbar component, and the controller is used to output a warning signal when the rate of change of the temperature value is greater than or equal to a third threshold. The battery device of this application can improve reliability.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] The reliability of battery devices is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0004] In view of this, embodiments of this application provide a battery device and an electrical device to improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application propose a battery device comprising a busbar and a plurality of battery cells stacked along a first direction. The busbar is located on the side of the battery cells facing a third direction. The busbar includes a first busbar sub-component, a second busbar sub-component, a first connecting sub-component, and a second connecting sub-component. The first and second busbar sub-components are spaced apart along the first direction and are respectively connected to different battery cells. The first and second connecting sub-components are both connected between the first and second busbar sub-components. The first and second connecting sub-components are arranged along a second direction and / or a third direction, wherein the second direction is perpendicular to the first direction and the third direction is perpendicular to both the first and second directions. The first connecting sub-component is configured to disconnect when subjected to a tensile force greater than or equal to a first threshold, and the second connecting sub-component is configured to disconnect when subjected to a tensile force greater than or equal to a second threshold, wherein the first threshold is greater than the second threshold.

[0006] By adopting the above technical solution, the first connecting component is configured to break when subjected to a tensile force greater than or equal to a first threshold, and the second connecting component is configured to break when subjected to a tensile force greater than or equal to a second threshold. That is, the tensile force threshold at which the first connecting component can be broken is the first threshold, and the tensile force threshold at which the second connecting component can be broken is the second threshold. Furthermore, the first threshold is greater than the second threshold, and the second connecting component can be broken under a smaller tensile force threshold. In other words, compared to the first connecting component, the second connecting component is more likely to break when subjected to tensile force.

[0007] When a battery cell expands and deforms, both the first and second connecting components are subjected to significant tensile forces. When these forces reach a second threshold, the second connecting component disconnects, while the first connecting component remains connected. The busbar can continue to conduct electricity to the battery cell, but the disconnection of the second connecting component reduces the effective area for current flow, increasing resistivity and current density. This accelerates the conversion of electrical energy into heat, causing the busbar's temperature to rise rapidly. Therefore, the battery device proposed in this embodiment can detect the disconnection of the second connecting component by monitoring the temperature change rate of the busbar before the first connecting component disconnects. The disconnection of the second connecting component allows for the detection of battery cell expansion and deformation, providing early warning before the battery cell's expansion and deformation reach a safety threshold, thereby improving the reliability of the battery device.

[0008] The battery device provided in this application embodiment further includes a controller and a temperature detector. The temperature detector is used to detect the temperature value of the busbar component. When the second connecting component is disconnected, the rate of change of the temperature value is greater than or equal to a third threshold. The controller is electrically connected to the temperature detector and is used to output a warning signal when the rate of change of the temperature value is greater than or equal to the third threshold. Therefore, the battery device provided in this application embodiment can output a warning signal when the second connecting component is disconnected, which helps to improve the reliability of the battery device.

[0009] In some possible implementations, the cross-sectional area of ​​the first connecting component is larger than the cross-sectional area of ​​the second connecting component, and the cross-sections of both the first and second connecting components are perpendicular to the first direction.

[0010] In this way, compared with the second connecting component, the first connecting component can withstand greater tensile force. When the battery cell expands and deforms but does not reach the safety threshold, the second connecting component can be broken first, while the first connecting component will not disconnect. The busbar component can continue to conduct the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0011] In some possible implementations, the dimension of the first connecting member in the second direction is larger than the dimension of the second connecting member in the second direction;

[0012] And / or, the dimension of the first connecting sub-component in the third direction is greater than the dimension of the second connecting sub-component in the third direction.

[0013] In this way, the cross-sectional area of ​​the first connecting component can be larger than that of the second connecting component. Compared with the second connecting component, the first connecting component can withstand greater tensile force. When the battery cell expands and deforms but does not reach the safety threshold, the second connecting component can be broken first, while the first connecting component will not break. The busbar component can continue to conduct the battery cell, thus providing an early warning before the expansion and deformation of the battery cell reaches the safety threshold.

[0014] In some possible implementations, the distance between the two opposite ends of the first connecting component along the first direction is the first distance, and the distance between the two opposite ends of the second connecting component along the first direction is the second distance, and the first distance is equal to the second distance.

[0015] In this way, the first connecting component has a larger dimension in the third direction than the second connecting component in the third direction. The first connecting component has better tensile strength, and / or, the first connecting component has a deformable segment that bends or folds along the first direction, giving it better ductility. In summary, compared to the second connecting component, the first connecting component can withstand greater tensile force. When the battery cell expands and deforms but has not reached the safety threshold, the second connecting component can be broken first, while the first connecting component will not disconnect. The busbar can continue to conduct electricity to the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0016] In some possible implementations, the extension length of the first connecting sub-component is greater than the extension length of the second connecting sub-component.

[0017] In this way, the first connecting component can have a deformable section that bends or folds along the first direction, while the second connecting component has a straight structure. Alternatively, the second connecting component can also have a deformable section that bends or folds along the first direction, but the degree of bending or folding of the second connecting component is less than that of the first connecting component. Therefore, compared to the second connecting component, the first connecting component has better ductility and can withstand greater tensile force. When the battery cell expands and deforms but has not reached the safety threshold, the second connecting component can be broken first, while the first connecting component will not disconnect, and the busbar can continue to conduct electricity to the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0018] In some possible implementations, the first connecting component is an arc-shaped structure, and the second connecting component is either an arc-shaped structure or a straight structure. Specifically, the first connecting component is recessed along the direction towards the battery cell, and when the second connecting component is an arc-shaped structure, it is also recessed along the direction towards the battery cell. This allows the first connecting component to have better ductility compared to the second connecting component. If the battery cell expands and deforms but has not reached a safety threshold, the second connecting component can be broken first, while the first connecting component will not disconnect, allowing the busbar to continue conducting electricity to the battery cell. This provides an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0019] In some possible implementations, the first connecting component is a sheet-like structure, and the second connecting component is a strip-like structure.

[0020] In this way, compared with the second connecting component, the first connecting component can have better tensile strength. When the battery cell expands and deforms but does not reach the safety threshold, the second connecting component can be broken first, while the first connecting component will not break. The busbar component can continue to conduct the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0021] In some possible implementations, there are at least two first connecting sub-components and at least one second connecting sub-component. Along the second direction, the second connecting sub-component is located between two adjacent first connecting sub-components, or the second connecting sub-component and the first connecting sub-component are alternately arranged.

[0022] In this way, after the second connecting component is disconnected, the first connecting component can be evenly arranged and subjected to uniform tension, which is beneficial to improving the reliability of the first connecting component and can also make the conduction current of the busbar component evenly distributed, which is beneficial to the uniform temperature change of the busbar component.

[0023] In some possible implementations, the first busbar includes a first layer and a second layer stacked sequentially in a direction away from the battery cell, and the second busbar includes a third layer and a fourth layer stacked sequentially in a direction away from the battery cell.

[0024] The first connecting component is connected between the first layer and the third layer, and the second connecting component is connected between the second layer and the fourth layer; or, the first connecting component is connected between the second layer and the fourth layer, and the second connecting component is connected between the first layer and the third layer.

[0025] In this way, the first and second connecting components can be arranged in layers, which helps to avoid the second connecting component affecting the arrangement of the first connecting component. This also allows the first connecting component to have better tensile strength, thus helping to prevent the first connecting component from disconnecting when it is below the safety threshold for expansion and deformation of the battery cell, thereby improving the service life of the busbar component.

[0026] In some possible implementations, there are at least two second connecting sub-components spaced apart along a second direction, and there is one first connecting sub-component that extends continuously along the second direction, wherein the length of the first connecting sub-component is greater than the total length of the second connecting sub-components in the second direction.

[0027] In this way, when the tensile force on the second connecting component is greater than or equal to the second threshold, at least one of the second connecting components can disconnect, thereby improving the detection sensitivity. Furthermore, since the tensile strength of at least two second connecting components is less than that of one first connecting component, when the battery cell expands and deforms but has not reached the safety threshold, the second connecting components can be broken first, while the first connecting component will not disconnect. The busbar can then continue to conduct electricity to the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0028] In some possible implementations, where the first connecting component is connected between the first and third layers, and the second connecting component is connected between the second and fourth layers, the projected area of ​​the second layer along the third direction is smaller than the projected area of ​​the first layer along the third direction, and / or, the projected area of ​​the fourth layer along the third direction is smaller than the projected area of ​​the third layer along the third direction.

[0029] In this way, the battery device provided in this application embodiment can reduce the amount of material used in the busbar component, which is beneficial to reducing costs.

[0030] In some possible implementations, the busbar component is a one-piece molded structure.

[0031] In this way, the busbar components can be manufactured in one piece, which helps to reduce costs.

[0032] In some possible implementations, the first connecting component and the second connecting component are made of different materials.

[0033] Wherein, the elongation of the first connecting sub-component is greater than that of the second connecting sub-component, and / or, the tensile strength of the first connecting sub-component is greater than that of the second connecting sub-component.

[0034] In this way, compared with the second connecting component, the first connecting component can have better extensibility. When the battery cell expands and deforms but does not reach the safety threshold, the second connecting component can be broken first, while the first connecting component will not break. The busbar component can continue to conduct the battery cell, thus providing an early warning before the battery cell expands and deforms to the safety threshold.

[0035] Secondly, embodiments of this application provide an electrical device that includes the battery device of any of the above embodiments. The electrical device proposed in this application has the same or similar technical effects as the battery device of any of the above embodiments, and will not be repeated here.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0039] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0040] Figure 3 This is one of the structural schematic diagrams of a battery cell assembly provided in some embodiments of this application;

[0041] Figure 4 This is a second schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0042] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle;

[0043] Figure 6 This is the third of the structural schematic diagrams of the battery cell assembly provided in some embodiments of this application;

[0044] Figure 7 yes Figure 6 A magnified view of a portion of point B in the middle;

[0045] Figure 8 This is one of the cross-sectional structural schematic diagrams of the busbar component provided in some embodiments of this application;

[0046] Figure 9 This is one of the cross-sectional structural schematic diagrams of the busbar component provided in some other embodiments of this application;

[0047] Figure 10 This is a second cross-sectional structural schematic diagram of a busbar component provided in some embodiments of this application;

[0048] Figure 11 This is the third of the cross-sectional structural schematic diagrams of the busbar component provided in some embodiments of this application;

[0049] Figure 12 This is a second cross-sectional structural schematic diagram of the busbar component provided in some other embodiments of this application;

[0050] Figure 13 yes Figure 12 A magnified view of a portion of point C.

[0051] The markings in the diagram mean:

[0052] Vehicle 1000; Battery unit 100; Controller 200; Motor 300;

[0053] First housing 110; Second housing 120; Battery cell assembly 130; Receiving space 1301; Battery cell 131; Busbar component 132;

[0054] First busbar component 1321; First layer 13211; Second layer 13212; First connecting part 13213; Second busbar component 1322; Third layer 13221; Fourth layer 13222; Second connecting part 13223; First connecting component 1323; Second connecting component 1324;

[0055] First cross section 13201; Second cross section 13202; First longitudinal section 13203; Second longitudinal section 13204;

[0056] First side 01; Second side 02; Third side 03; Fourth side 04;

[0057] First dividing line 001; Second dividing line 002. Detailed Implementation

[0058] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0064] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0067] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0068] The reliability of battery devices is a crucial issue. Battery devices typically consist of a casing and multiple individual battery cells housed within it. During use, these individual cells may expand or deform. Exceeding safety thresholds can increase stress on certain components, thereby increasing the risk to the battery device and impacting its reliability. For example, repeated charge-discharge cycles within a single battery cell can lead to side reactions that continuously generate gas, increasing internal pressure and potentially causing the cell to expand and deform.

[0069] In view of this, embodiments of this application provide a battery device, which includes a busbar and a plurality of battery cells. The plurality of battery cells are stacked along a first direction. The busbar connects the plurality of battery cells and is located on the side of the battery cells facing a third direction. The busbar includes a first busbar sub-component, a second busbar sub-component, a first connecting sub-component, and a second connecting sub-component. The first busbar sub-component and the second busbar sub-component are spaced apart along the first direction and respectively connect two adjacent battery cells along the first direction. The first connecting sub-component and the second connecting sub-component are both connected between the first busbar sub-component and the second busbar sub-component. The first connecting sub-component and the second connecting sub-component are arranged along a second direction and / or a third direction, where the second direction is perpendicular to the first direction and the third direction is perpendicular to both the first and second directions.

[0070] The first connecting component is configured to break when subjected to a tensile force greater than or equal to a first threshold, and the second connecting component is configured to break when subjected to a tensile force greater than or equal to a second threshold. The first threshold is greater than the second threshold. That is, the tensile force threshold at which the first connecting component can be broken is the first threshold, and the tensile force threshold at which the second connecting component can be broken is the second threshold. Since the first threshold is greater than the second threshold, the second connecting component can be broken at a smaller tensile force threshold than the first connecting component. In other words, the second connecting component is more likely to break when subjected to tensile force than the first connecting component.

[0071] It is understandable that when a battery cell expands and deforms, both the first and second connecting components will be subjected to significant tensile forces. When these forces reach a second threshold, the second connecting component will disconnect, while the first connecting component will not. The busbar can continue to conduct electricity to the battery cell, but the disconnection of the second connecting component reduces the effective area for current flow, increasing resistivity and current density, accelerating the conversion of electrical energy into heat, and causing the temperature of the busbar to rise rapidly. Therefore, the battery device proposed in this application can detect the disconnection of the second connecting component by monitoring the temperature change rate of the busbar before the first connecting component disconnects. The disconnection of the second connecting component allows for the detection of battery cell expansion and deformation, providing early warning information before the battery cell's expansion and deformation reach a safety threshold, thereby improving the reliability of the battery device.

[0072] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0073] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0074] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage devices, energy storage systems, and charging networks that use the battery device as an energy storage element. Electrical devices can be, but are not limited to, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0075] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device from some embodiments of this application.

[0076] Please see Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle, etc.

[0077] The vehicle 1000 has a battery device 100 installed inside, which may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle 1000's operating power source. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0078] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0079] Please see Figure 2 , Figure 2This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 130 for providing voltage and capacity. The battery cell assembly 130 may include multiple battery cells 131, which are connected in series, parallel, or mixed connection through a busbar 132.

[0080] In some embodiments, multiple battery cells 131 in the battery device 100 can be electrically connected through a busbar 132 to achieve parallel, series, or mixed connection of multiple battery cells 131 in the battery device 100.

[0081] Please see Figure 3 , Figure 3 This is one of the structural schematic diagrams of a battery cell assembly 130 provided in some embodiments of this application. In some embodiments, the battery cell assembly 130 is typically formed by arranging multiple battery cells 131. As an example, the battery cell assembly 130 can be a battery module, which is formed by arranging and fixing multiple battery cells 131 to form an independent module. As an example, a battery module can be formed by binding multiple battery cells 131 together with cable ties.

[0082] Please continue reading. Figure 2 In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell assemblies 130 housed within the housing.

[0083] As an example, the battery cell assembly 130 can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0084] As an example, the battery cell assembly 130 can also be housed in the housing by directly fixing multiple battery cells 131 to the housing.

[0085] As an example, the enclosure may include a first enclosure 110 (lower enclosure) and a second enclosure 120 (upper enclosure). The first enclosure 110 and the second enclosure 120 are fastened together to form a closed receiving cavity inside the enclosure to house the battery cell assembly 130. Here, "closed" means covered or closed, and can be either sealed or unsealed.

[0086] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, forming a closed receiving cavity inside the enclosure to house the battery cell assembly 130.

[0087] As an example, the housing may be part of the chassis structure of vehicle 1000. For instance, the top cover of the housing may be at least part of the floor of vehicle 1000, or the frame of the housing may be at least part of the crossbeams and longitudinal beams of vehicle 1000.

[0088] Please see Figure 4 and Figure 5 , Figure 4 This is the second of the structural schematic diagrams of the battery cell assembly 130 provided in some embodiments of this application. Figure 5 yes Figure 4 A magnified view of a portion at point A. The plurality of battery cells 131 are arranged along a first direction (e.g., Figure 5 The stacked arrangement (in the X direction) of the battery cell 131 is such that the busbar 132 is located in the third direction (e.g., in the X direction). Figure 5 On one side of the Z direction, the busbar component 132 includes a first busbar sub-component 1321, a second busbar sub-component 1322, a first connecting sub-component 1323, and a second connecting sub-component 1324. The first busbar sub-component 1321 and the second busbar sub-component 1322 are spaced apart along the first direction and are respectively connected to different battery cells 131. The first connecting sub-component 1323 and the second connecting sub-component 1324 are both connected between the first busbar sub-component 1321 and the second busbar sub-component 1322.

[0089] It is understood that the battery cell 131 connected to the first busbar 1321 can be adjacent to the battery cell 131 connected to the second busbar 1322 along the first direction. That is, the first busbar 1321 is connected to one of the two adjacent battery cells 131, and the second busbar 1322 is connected to the other of the two adjacent battery cells 131. Furthermore, the first connecting component 1323 is connected between the first busbar 1321 and the second busbar 1322, and the second connecting component 1324 is connected between the first busbar 1321 and the second busbar 1322. This allows the busbar component 132 to conduct the two adjacent battery cells 131.

[0090] Of course, the battery cell 131 connected to the first busbar 1321 and the battery cell 131 connected to the second busbar 1322 may not be adjacent along the first direction. That is, there may be other battery cells 131 between the battery cell 131 connected to the first busbar 1321 and the battery cell 131 connected to the second busbar 1322, and the first connecting component 1323 and the second connecting component 1324 may cross over other battery cells 131.

[0091] Wherein, the first connecting sub-component 1323 and the second connecting sub-component 1324 are along the second direction (e.g. Figure 5The first connecting component 1323 and the second connecting component 1324 can be spaced apart along the second direction (Y direction) and / or a third direction, wherein the second direction is perpendicular to the first direction and the third direction is perpendicular to both the first and second directions. For example, the first connecting component 1323 and the second connecting component 1324 can be spaced apart along the second direction.

[0092] Please see Figure 6 and Figure 7 , Figure 6 This is the third of the structural schematic diagrams of the battery cell assembly 130 provided in some embodiments of this application. Figure 7 yes Figure 6 A magnified view of a portion at point B. For example, the first connecting sub-component 1323 and the second connecting sub-component 1324 can be positioned along a third direction.

[0093] Optionally, while the first connecting sub-component 1323 and the second connecting sub-component 1324 are spaced apart along the second direction, they can also be spaced apart along a third direction. That is, there can be multiple second connecting sub-components 1324; some second connecting sub-components 1324 can be spaced apart from the first connecting sub-component 1323 along the second direction, while others can be spaced apart from the first connecting sub-component 1323 along a third direction. Alternatively, there can be a single second connecting sub-component 1324, which is spaced apart from the first connecting sub-component 1323 in the second direction, and also spaced apart from the first connecting sub-component 1323 in the third direction. In other words, the second connecting sub-component 1324 and the first connecting sub-component 1323 are spaced apart in the second direction, and the second connecting sub-component 1324 is higher or lower than the first connecting sub-component 1323 in the third direction.

[0094] It is understood that the first connecting sub-component 1323 and the second connecting sub-component 1324 can be arranged at intervals, and at least a portion of the first connecting sub-component 1323 can also be in contact with the second connecting sub-component 1324.

[0095] Please refer to the following: Figures 4 to 7 In the battery device 100 provided in some embodiments of this application, the first connecting member 1323 is configured to disconnect when subjected to a tensile force greater than or equal to a first threshold, and the second connecting member 1324 is configured to disconnect when subjected to a tensile force greater than or equal to a second threshold. The first threshold is greater than the second threshold, that is, the tensile force threshold at which the first connecting member 1323 can be broken is the first threshold, and the tensile force threshold at which the second connecting member 1324 can be broken is the second threshold. Since the first threshold is greater than the second threshold, the second connecting member 1324 can be broken at a smaller tensile force threshold. In other words, compared to the first connecting member 1323, the second connecting member 1324 is more likely to disconnect when subjected to tensile force.

[0096] It is understandable that when the battery cell 131 expands and deforms, the first connecting sub-component 1323 and the second connecting sub-component 1324 will be subjected to a large tensile force. When the tensile force reaches the second threshold, the second connecting sub-component 1324 will disconnect, while the first connecting sub-component 1323 will not disconnect. The current-carrying component 132 can continue to conduct the battery cell 131. However, since the second connecting sub-component 1324 is disconnected, the effective area for current to pass through will decrease, which will increase the resistivity and current density, accelerate the conversion of electrical energy into heat energy, and thus cause the temperature of the current-carrying component 132 to rise rapidly.

[0097] In this way, the battery device 100 proposed in this application embodiment can determine the disconnection of the second connecting component 1324 by detecting the temperature change rate of the busbar component 132 before the first connecting component 1323 is disconnected. The disconnection of the second connecting component 1324 can determine that the expansion and deformation of the battery cell 131 has reached a certain value, but has not exceeded the safety threshold. Thus, a warning message can be obtained before the expansion and deformation of the battery cell 131 reaches the safety threshold, thereby improving the reliability of the battery device 100.

[0098] Please see Figure 8 and Figure 9 , Figure 8 This is one of the cross-sectional structural schematic diagrams of the busbar component 132 provided in some embodiments of this application. Figure 9 This is one of the cross-sectional structural schematic diagrams of the busbar component 132 provided in other embodiments of this application. In some embodiments, the cross-sectional area of ​​the first connecting sub-component 1323 is larger than the cross-sectional area of ​​the second connecting sub-component 1324, and the cross-sections of both the first connecting sub-component 1323 and the second connecting sub-component 1324 are perpendicular to the first direction. The cross-section of the first connecting sub-component 1323 can be a first cross-section 13201, and the cross-section of the second connecting sub-component 1324 can be a second cross-section 13202. The area of ​​the first cross-section 13201 is larger than the area of ​​the second cross-section 13202. When the first connecting sub-component 1323 and the second connecting sub-component 1324 are subjected to the same tensile force, the stress per unit area of ​​the second connecting sub-component 1324 is greater than that of the first connecting sub-component 1323, resulting in reduced tensile strength and making it more prone to breakage.

[0099] Therefore, compared to the second connecting component 1324, the first connecting component 1323 can withstand greater tensile force. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting component 1324 can be broken first, while the first connecting component 1323 will not disconnect. The busbar component 132 can continue to conduct the battery cell 131, thereby providing an early warning before the expansion and deformation of the battery cell 131 reaches the safety threshold, which can improve the reliability of the battery device 100.

[0100] Optionally, the dimension of the first connecting sub-component 1323 in the second direction Y is larger than the dimension of the second connecting sub-component 1324 in the second direction. This is beneficial to increase the area of ​​the first cross-section 13201 of the first connecting sub-component 1323, so that the area of ​​the first cross-section 13201 of the first connecting sub-component 1323 is larger than the area of ​​the second cross-section 13202 of the second connecting sub-component 1324. This allows the first connecting sub-component 1323 to withstand greater tensile force. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first, while the first connecting sub-component 1323 will not break.

[0101] Optionally, the dimension of the first connecting sub-component 1323 in the third direction Z is greater than the dimension of the second connecting sub-component 1324 in the third direction. This can also help increase the area of ​​the first cross-section 13201 of the first connecting sub-component 1323, so that the area of ​​the first cross-section 13201 of the first connecting sub-component 1323 is greater than the area of ​​the second cross-section 13202 of the second connecting sub-component 1324. This allows the first connecting sub-component 1323 to withstand greater tensile force. When the battery cell 131 expands and deforms but does not reach the safety threshold deformation, the second connecting sub-component 1324 can be broken first.

[0102] For example, in order to make the area of ​​the first cross section 13201 of the first connecting sub-component 1323 greater than the area of ​​the second cross section 13202 of the second connecting sub-component 1324, when the size of the first connecting sub-component 1323 in the third direction Z is equal to the size of the second connecting sub-component 1324 in the third direction, the size of the first connecting sub-component 1323 in the second direction Y can be greater than the size of the second connecting sub-component 1324 in the second direction.

[0103] For example, in order to make the area of ​​the first cross section 13201 of the first connecting sub-component 1323 greater than the area of ​​the second cross section 13202 of the second connecting sub-component 1324, when the size of the first connecting sub-component 1323 in the second direction Y is equal to the size of the second connecting sub-component 1324 in the second direction, the size of the first connecting sub-component 1323 in the third direction Z can be greater than the size of the second connecting sub-component 1324 in the third direction.

[0104] For example, in order to make the area of ​​the first cross section 13201 of the first connecting sub-component 1323 greater than the area of ​​the second cross section 13202 of the second connecting sub-component 1324, the dimension of the first connecting sub-component 1323 in the second direction Y can be greater than the dimension of the second connecting sub-component 1324 in the second direction, and the dimension of the first connecting sub-component 1323 in the third direction Z can be greater than the dimension of the second connecting sub-component 1324 in the third direction.

[0105] For example, in order to make the area of ​​the first cross section 13201 of the first connecting sub-component 1323 larger than the area of ​​the second cross section 13202 of the second connecting sub-component 1324, the dimension of the second connecting sub-component 1324 in the third direction can be larger than the dimension of the first connecting sub-component 1323 in the third direction Z, but the dimension of the second connecting sub-component 1324 in the second direction Y is much smaller than the dimension of the first connecting sub-component 1323 in the second direction Y. Therefore, the battery device 100 provided in this application embodiment can increase the area of ​​the first cross-section 13201 of the first connecting sub-component 1323 or decrease the area of ​​the second cross-section 13202 of the second connecting sub-component 1324, so that the area of ​​the first cross-section 13201 of the first connecting sub-component 1323 is greater than the area of ​​the second cross-section 13202 of the second connecting sub-component 1324, thereby making the tensile strength of the second connecting sub-component 1324 less than the tensile strength of the first connecting sub-component 1323, thereby causing the battery cell 131 to expand and deform, and before reaching the safety threshold, the second connecting sub-component 1324 can be broken first.

[0106] Please refer to the following: Figure 10 , Figure 11 , Figure 12 and Figure 13 , Figure 10 This is the second cross-sectional view of the busbar component 132 provided in some embodiments of this application. Figure 11 This is the third of the cross-sectional structural schematic diagrams of the busbar component 132 provided in some embodiments of this application. Figure 12 This is the second cross-sectional view of the busbar component 132 provided in some other embodiments of this application. Figure 13 yes Figure 12 A magnified view of a portion of point C.

[0107] In some embodiments, the two opposite ends of the first connecting component 1323 along the first direction X are respectively connected to the first bus component 1321 and the second bus component 1322, and the distance between the two opposite ends of the first connecting component 1323 along the first direction is a first distance; the two opposite ends of the second connecting component 1324 along the first direction X are respectively connected to the first bus component 1321 and the second bus component 1322, and the distance between the two opposite ends of the second connecting component 1324 along the first direction is a second distance, and the first distance is equal to the second distance. For example, Figure 10 , Figure 11 as well as Figure 13 The first dividing line 001 and the second dividing line 002 are illusory dividing lines. The portion of the busbar 132 between the first dividing line 001 and the second dividing line 002 is either the first connecting sub-component 1323 or the second connecting sub-component 1324. For example, please refer to... Figure 10The distance between the two opposite ends of the first connecting component 1323 along the first direction is the first distance L1 between the first boundary line 001 and the second boundary line 002; for example, please refer to Figure 11 The distance between the two opposite ends of the second connecting component 1324 along the first direction is the second distance L2 between the first dividing line 001 and the second dividing line 002.

[0108] It is understandable that the first distance L1 and the second distance L2 can be equal to the interval between the first busbar 1321 and the second busbar 1322 in the first direction. The interval between the first busbar 1321 and the second busbar 1322 in the first direction can remain unchanged in the second direction, which facilitates the processing of the busbar component 132.

[0109] Of course, in other embodiments, the first distance L1 and the second distance L2 may not be equal. As long as the first connector has a better extension capacity than the second connector 1324, the tensile strength of the first connector 1323 can be greater than that of the second connector 1324.

[0110] Please continue reading. Figure 10 , Figure 11 , Figure 12 and Figure 13 In some embodiments, the extension length of the first connecting sub-component 1323 is greater than the extension length of the second connecting sub-component 1324. The extension length refers to the length along the extension path. For example, if the first connecting sub-component 1323 extends along an arc segment, the extension length of the first connecting sub-component 1323 is the length of the arc segment. Alternatively, if the first connecting sub-component 1323 extends along a curve segment, the extension length of the first connecting sub-component 1323 is equal to the length of the first connecting sub-component 1323 after it has been straightened.

[0111] In this way, when the first distance L1 is equal to the second distance L2, the extension capability of the first connecting sub-component 1323 is better than that of the second connecting sub-component 1324. The second connecting sub-component 1324, which has a shorter extension length, will bear the tension first. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first, while the first connecting sub-component 1323 will not break.

[0112] For example, the longitudinal section (first longitudinal section 13203) of the first connecting sub-component 1323 includes a first side 01 and a second side 02 opposite each other in the third direction, the length of the first side 01 being greater than the length of the second side 02. The longitudinal section (second longitudinal section 13204) of the second connecting sub-component 1324 includes a third side 03 and a fourth side 04 opposite each other in the third direction, the length of the third side 03 being greater than or equal to the length of the fourth side 04. Specifically, the length of the first side 01 is greater than the length of the third side 03, and the length of the second side 02 is greater than the length of the fourth side 04. (See also...) Figure 10 The first longitudinal section 13203 is located between the first boundary line 001 and the second boundary line 002; please refer to [link / reference]. Figure 11 The second longitudinal section 13204 is located between the first boundary line 001 and the second boundary line 002.

[0113] It is understandable that the length of the first side 01 of the first longitudinal section 13203 is greater than the length of the second side 02, that is, the first connecting sub-component 1323 can have a deformed segment that bends or folds along the first direction. When the length of the third side 03 of the second longitudinal section 13204 is equal to the length of the fourth side 04, the second connecting sub-component 1324 can be a straight structure. Therefore, compared with the second connecting sub-component 1324, the first connecting sub-component 1323 has better extensibility and can withstand greater tensile force.

[0114] Furthermore, when the length of the third side 03 of the second longitudinal section 13204 is greater than the length of the fourth side 04, the second connecting sub-part 1324 also has a deformed segment that bends or folds along the first direction. However, since the length of the first side 01 is greater than the length of the third side 03, and the length of the second side 02 is greater than the length of the fourth side 04, the degree of bending or folding of the second connecting sub-part 1324 is less than the degree of bending or folding of the first connecting sub-part 1323. Compared with the second connecting sub-part 1324, the first connecting sub-part 1323 has better extensibility and can withstand greater tensile force.

[0115] It should be noted that the rate of change of the dimensions of the first connecting sub-component 1323 and the second connecting sub-component 1324 in the third direction is less than or equal to a preset value, for example, the rate of change in the first direction can be 0. In this way, the first connecting sub-component 1323 and the second connecting sub-component 1324 will not cause stress concentration due to abrupt changes in the dimensions in the third direction, thereby improving reliability.

[0116] Therefore, in the battery device 100 provided in this application embodiment, compared with the second connecting sub-component 1324, the first connecting sub-component 1323 has better extensibility and can withstand greater tensile force. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first, while the first connecting sub-component 1323 will not disconnect. The busbar component 132 can continue to conduct the battery cell 131, thereby providing an early warning before the expansion and deformation of the battery cell 131 reaches the safety threshold, thereby improving the reliability of the battery device 100.

[0117] Please continue reading. Figure 10 and Figure 13 and combined Figure 5 and Figure 7 Optionally, the first connecting sub-component 1323 is an arc-shaped structure, and the second connecting sub-component 1324 is an arc-shaped structure or a straight structure. The first connecting sub-component 1323 is recessed in the direction toward the battery cell, and when the second connecting sub-component 1324 is an arc-shaped structure, the second connecting sub-component 1324 is also recessed in the direction toward the battery cell.

[0118] For example, the first side 01 is located on the side of the second side 02 closer to the battery cell 131. In this way, the bending or folding direction of the deformable section of the first connecting sub-component 1323 can be towards the battery cell 131. It is understood that the corners of the battery cell 131 are chamfered. At the splicing point of two adjacent battery cells 131, the chamfers of the two battery cells 131 can form a receiving space 1301. The deformable section of the first connecting sub-component 1323 can be bent or folded towards the battery cell 131. In this way, the receiving space 1301 can accommodate the deformable section of the first connecting sub-component 1323, which is beneficial to reducing the size of the battery device 100 in the third direction Z.

[0119] Of course, the first connecting sub-component 1323 can also be recessed in a direction away from the battery cell. For example, the first side 01 can also be located on the side of the second side 02 away from the battery cell 131, that is, the direction in which the deformed section of the first connecting sub-component 1323 bends or bends can be the direction away from the battery cell 131. In this way, the direction in which the deformed section of the first connecting sub-component 1323 bends or bends can be towards or away from the battery cell 131, and the direction in which the deformed section of the first connecting sub-component 1323 bends or bends can be selected as needed, which has good versatility.

[0120] For example, the length of the third side 03 is greater than the length of the fourth side 04, and the third side 03 is located on the side of the fourth side 04 closer to the battery cell 131. Of course, when the second connecting sub-component 1324 is an arc-shaped structure, the second connecting sub-component 1324 can also be recessed in the direction towards the battery cell. For example, the third side 03 is located on the side of the fourth side 04 away from the battery cell 131.

[0121] At this time, the second connecting sub-component 1324 may have a bent or folded deformable section. Similarly, the bending or folding direction of the deformable section of the second connecting sub-component 1324 may be towards or away from the battery cell 131. The bending or folding direction of the deformable section of the second connecting sub-component 1324 can be selected as needed, which has good versatility.

[0122] Optionally, the first connecting sub-component 1323 is an arc-shaped structure, and the second connecting sub-component 1324 is an arc-shaped structure. The arc of the first connecting sub-component 1323 is greater than that of the second connecting sub-component 1324. In this way, the first connecting sub-component 1323 can have better extensibility than the second connecting sub-component 1324. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first.

[0123] Optionally, the first connecting sub-component 1323 has an arc-shaped structure, and the second connecting sub-component 1324 has a straight structure. In this way, compared with the second connecting sub-component 1324, the first connecting sub-component 1323 can have better extensibility. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first.

[0124] Therefore, the battery device 100 provided in this application embodiment can increase the elongation capability of the first connecting sub-component 1323 or decrease the elongation capability of the second connecting sub-component 1324, so that the elongation capability of the first connecting sub-component 1323 is greater than that of the second connecting sub-component 1324, thereby making the tensile strength of the second connecting sub-component 1324 less than that of the first connecting sub-component 1323, thereby causing the battery cell 131 to expand and deform, and before reaching the safety threshold, the second connecting sub-component 1324 can be broken first.

[0125] It is understandable that both the first connecting sub-component 1323 and the second connecting sub-component 1324 belong to the busbar component 132. The dimensions of the busbar component 132 in the third direction Z are within a preset range. The dimensional difference between the first connecting sub-component 1323 and the second connecting sub-component 1324 in the third direction Z has a negligible effect on the tensile strength. Therefore, the structural shape of the first connecting sub-component 1323 and the second connecting sub-component 1324 has a certain influence on the tensile strength. The structural shape of the first connecting sub-component 1323 and the second connecting sub-component 1324 will be described below.

[0126] Optionally, the first connecting sub-component 1323 is a sheet structure and the second connecting sub-component 1324 is a strip structure. In this way, compared with the second connecting sub-component 1324, the first connecting sub-component 1323 can have better tensile strength. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting sub-component 1324 can be broken first.

[0127] Please continue reading. Figure 5 , Figure 8 and Figure 10 In some embodiments, there are at least two first connecting sub-components 1323 and at least one second connecting sub-component 1324. Along the second direction, the second connecting sub-component 1324 is located between two adjacent first connecting sub-components 1323, or the second connecting sub-component and the first connecting sub-component are alternately arranged.

[0128] In this way, after the second connecting component 1324 is disconnected, the first connecting component 1323 can be evenly arranged and subjected to tensile force evenly, which is beneficial to improving the reliability of the first connecting component 1323.

[0129] Furthermore, when the first connecting sub-components 1323 are evenly arranged, the conduction current of the busbar component 132 can also be evenly distributed, which is beneficial to the uniform temperature change of the busbar component 132.

[0130] Please continue reading. Figure 7 and Figure 13 In some embodiments, the first busbar 1321 includes a first layer 13211 and a second layer 13212 stacked sequentially along a third direction away from the battery cell 131, and the second busbar 1322 includes a third layer 13221 and a fourth layer 13222 stacked sequentially along a third direction away from the battery cell 131. The first layer 13211 is located on the side of the second layer 13212 facing the battery cell 131, and the third layer 13221 is located on the side of the fourth layer 13222 facing the battery cell 131. For example, the first layer 13211 may be located below the second layer 13212, and the third layer 13221 may be located below the fourth layer 13222.

[0131] It is understood that the first busbar 1321 is an integral structure, and the first busbar 1321 includes a first connecting portion 13213 connecting the first layer 13211 and the second layer 13212. The second busbar 1322 is an integral structure, and the second busbar 1322 includes a second connecting portion 13223 connecting the third layer 13221 and the fourth layer 13222. This facilitates the processing of the busbar component 132.

[0132] In some examples, the first connecting component 1323 is connected between the first layer 13211 and the third layer 13221, and the second connecting component 1324 is connected between the second layer 13212 and the fourth layer 13222.

[0133] Optionally, the projected area of ​​the second layer 13212 along the third direction is smaller than the projected area of ​​the first layer 13211 along the third direction.

[0134] Optionally, the projected area of ​​the fourth layer 13222 along the third direction is smaller than the projected area of ​​the third layer 13221 along the third direction.

[0135] Optionally, the projected area of ​​the second layer 13212 along the third direction is smaller than the projected area of ​​the first layer 13211 along the third direction, and the projected area of ​​the fourth layer 13222 along the third direction is smaller than the projected area of ​​the third layer 13221 along the third direction.

[0136] In this way, the battery device 100 provided in this application embodiment can reduce the amount of material used in the busbar component 132, which is beneficial to reducing costs.

[0137] In other examples, the first connecting component 1323 is connected between the second layer 13212 and the fourth layer 13222, and the second connecting component 1324 is connected between the first layer 13211 and the third layer 13221.

[0138] It is understandable that the battery device 100 can be used normally when the expansion and deformation of the battery cell 131 is below the safety threshold. However, the expansion and deformation of the battery cell 131 will exert a tensile force on the busbar component 132, so the busbar component 132 needs to withstand a certain tensile force.

[0139] In the battery device 100 provided in this application embodiment, the first connecting sub-component 1323 and the second connecting sub-component 1324 can be arranged in layers, which helps to avoid the second connecting sub-component 1324 affecting the arrangement of the first connecting sub-component 1323, thus making it less likely to affect the tensile strength of the first connecting sub-component 1323. This allows the busbar component 132 to have a certain tensile strength, which can prevent the first connecting sub-component 1323 from disconnecting when it is below the expansion deformation safety threshold of the battery cell 131, thereby helping to improve the service life of the busbar component 132.

[0140] In some embodiments, there are at least two second connecting parts 1324, and the at least two second connecting parts 1324 are spaced apart along a second direction. In this way, when the tensile force on the second connecting part 1324 is greater than or equal to the second threshold, at least one second connecting part 1324 can be disconnected, thereby providing a timely warning and improving the sensitivity.

[0141] Furthermore, the first connecting sub-component 1323 is a single unit that extends continuously along a second direction, where the length of the first connecting sub-component is greater than the total length of the second connecting sub-components. This ensures that the tensile strength of at least two second connecting sub-components is less than that of one first connecting sub-component. When a battery cell expands and deforms but before reaching a safety threshold, the second connecting sub-components can be broken first, while the first connecting sub-components remain connected. This allows the busbar to continue conducting electricity to the battery cell, thus providing an early warning before the battery cell's expansion and deformation reach the safety threshold.

[0142] In some embodiments, the battery device 100 provided in this application further includes a controller 200 and a temperature detector. The temperature detector is used to detect the temperature value of the busbar component 132. When the second connecting component 1324 is disconnected, the rate of change of the temperature value is greater than or equal to a third threshold. The controller 200 is electrically connected to the temperature detector and is used to output a warning signal when the rate of change of the temperature value is greater than or equal to the third threshold.

[0143] In this way, the battery device 100 provided in this application embodiment can output a warning signal when the second connecting component 1324 is disconnected, which helps to improve the reliability of the battery device 100.

[0144] In some embodiments, the busbar component 132 is a one-piece molded structure. This allows the busbar component 132 to be manufactured in one piece, which helps reduce costs. The manufacturing methods for the busbar component 132 may include casting, stamping, etc.

[0145] In other embodiments, the first connecting sub-component 1323 and the second connecting sub-component 1324 are made of different materials, wherein the elongation of the first connecting sub-component 1323 is greater than the elongation of the second connecting sub-component 1324, and / or the tensile strength of the first connecting sub-component 1323 is greater than the tensile strength of the second connecting sub-component 1324.

[0146] Optionally, the material of the first connecting component 1323 can be silver, copper, gold, aluminum, etc., and the material of the second connecting component 1324 can be copper, gold, aluminum, iron, etc. Specifically, when the material of the first connecting component 1323 is silver, the material of the second connecting component 1324 can be copper, gold, aluminum, or iron; when the material of the first connecting component 1323 is copper, the material of the second connecting component 1324 can be gold, aluminum, or iron; when the material of the first connecting component 1323 is gold, the material of the second connecting component 1324 can be aluminum or iron; and when the material of the first connecting component 1323 is aluminum, the material of the second connecting component 1324 can be iron.

[0147] Of course, the materials of the first connecting sub-component 1323 and the second connecting sub-component 1324 can be other choices, as long as the tensile strength of the first connecting sub-component 1323 is greater than that of the second connecting sub-component 1324.

[0148] In this way, compared with the second connecting component 1324, the first connecting component 1323 can have better tensile strength. When the battery cell 131 expands and deforms but does not reach the safety threshold, the second connecting component 1324 can be broken first, while the first connecting component 1323 will not disconnect. The busbar component 132 can continue to conduct the battery cell 131, thereby providing an early warning before the expansion and deformation of the battery cell 131 reaches the safety threshold, which can improve the reliability of the battery device 100.

[0149] According to some embodiments of this application, this application also proposes an electrical device that includes the battery device 100 of any of the above embodiments. The electrical device proposed in this application has the same or similar technical effects as the battery device 100 of any of the above embodiments, and will not be described again here.

[0150] It is understood that the electrical device provided in the embodiments of this application may include a battery management system (BMS), which includes the controller 200 and temperature detector described above.

[0151] Please refer to the following: Figures 4 to 13The battery device provided in this application embodiment includes a busbar component 132 and a plurality of battery cells 131. The plurality of battery cells 131 are stacked along a first direction. The busbar component 132 connects the plurality of battery cells 131 and is located on the side of the battery cells 131 facing a third direction. The busbar component 132 includes a first busbar sub-component 1321, a second busbar sub-component 1322, a first connecting sub-component 1323, and a second connecting sub-component 1324. The first busbar sub-component 1321 and the second busbar sub-component 1322 are spaced apart along the first direction and respectively connect two adjacent battery cells 131 along the first direction. The first connecting sub-component 1323 and the second connecting sub-component 1324 are both connected between the first busbar sub-component 1321 and the second busbar sub-component 1322. The first connecting sub-component 1323 and the second connecting sub-component 1324 are arranged along a second direction and / or a third direction. The second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction. When the battery cell 131 expands and deforms, the first connecting component 1323 and the second connecting component 1324 will be subjected to a large tensile force. When the tensile force reaches a second threshold, the second connecting component 1324 will disconnect, while the first connecting component 1323 will not disconnect. The busbar 132 can continue to conduct the battery cell 131. However, because the second connecting component 1324 is disconnected, the effective area for current flow is reduced, resulting in increased resistivity and current density. The rate at which electrical energy is converted into heat energy is accelerated, causing the temperature of the busbar 132 to rise rapidly. In this way, the battery device 100 proposed in this application can determine the disconnection of the second connecting component 1324 by detecting the rate of temperature change of the busbar 132 before the first connecting component 1323 disconnects. The disconnection of the second connecting component 1324 can be used to determine the expansion and deformation of the battery cell 131, thereby providing early warning information before the expansion and deformation of the battery cell 131 reaches the safety threshold, thus improving the reliability of the battery device 100.

[0152] Among them, the busbar component 132 is a one-piece molded structure. The busbar component 132 can be processed by casting, stamping and other methods, which helps to reduce costs.

[0153] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Multiple battery cells are stacked along a first direction; A current-combining component is located on the third-direction upward side of the battery cell. The current-combining component includes a first current-combining sub-component, a second current-combining sub-component, a first connecting sub-component, and a second connecting sub-component. The first busbar and the second busbar are spaced apart along the first direction and are respectively connected to different battery cells. The first connecting component and the second connecting component are both connected between the first busbar and the second busbar. The first connecting sub-component and the second connecting sub-component are disposed along a second direction and / or the third direction, wherein the second direction is perpendicular to the first direction and the third direction is perpendicular to both the first direction and the second direction; The first connecting component is configured to disconnect when subjected to a tensile force greater than or equal to a first threshold, and the second connecting component is configured to disconnect when subjected to a tensile force greater than or equal to a second threshold, wherein the first threshold is greater than the second threshold. A temperature detector is used to detect the temperature value of the busbar component. When the second connecting component is disconnected, the rate of change of the temperature value is greater than or equal to a third threshold. A controller, electrically connected to the temperature detector, is used to output a warning signal when the rate of change of the temperature value is greater than or equal to a third threshold.

2. The battery device as claimed in claim 1, characterized in that, The cross-sectional area of ​​the first connecting component is larger than that of the second connecting component, and the cross-sections of both the first and second connecting components are perpendicular to the first direction.

3. The battery device as claimed in claim 2, characterized in that, The dimension of the first connecting component in the second direction is larger than the dimension of the second connecting component in the second direction; And / or, the dimension of the first connecting component in the third direction is greater than the dimension of the second connecting component in the third direction.

4. The battery device as claimed in claim 1, characterized in that, The distance between the two opposite ends of the first connecting component along the first direction is the first distance, and the distance between the two opposite ends of the second connecting component along the first direction is the second distance, and the first distance is equal to the second distance.

5. The battery device as claimed in claim 4, characterized in that, The extension length of the first connecting component is greater than the extension length of the second connecting component.

6. The battery device as claimed in claim 5, characterized in that, The first connecting component is an arc-shaped structure, and the second connecting component is either an arc-shaped structure or a straight structure; wherein, when the first connecting component is recessed in the direction toward the battery cell, and when the second connecting component is an arc-shaped structure, the second connecting component is recessed in the direction toward the battery cell.

7. The battery device according to any one of claims 1 to 6, characterized in that, The first connecting component is a sheet-like structure, and the second connecting component is a strip-like structure.

8. The battery device according to any one of claims 1 to 6, characterized in that, There are at least two first connecting sub-components and at least one second connecting sub-component. Along the second direction, the second connecting sub-component is located between two adjacent first connecting sub-components, or the second connecting sub-component and the first connecting sub-component are alternately arranged.

9. The battery device according to any one of claims 1 to 6, characterized in that, The first busbar includes a first layer and a second layer stacked sequentially along the third direction and away from the battery cell; the second busbar includes a third layer and a fourth layer stacked sequentially along the third direction and away from the battery cell. Wherein, the first connecting component is connected between the first layer and the third layer, and the second connecting component is connected between the second layer and the fourth layer; or, the first connecting component is connected between the second layer and the fourth layer, and the second connecting component is connected between the first layer and the third layer.

10. The battery device as claimed in claim 9, characterized in that, The second connecting sub-component is at least two and is spaced apart along the second direction, and the first connecting sub-component is one and extends continuously along the second direction. In the second direction, the length of the first connecting sub-component is greater than the total length of the second connecting sub-component.

11. The battery device as claimed in claim 9, characterized in that, When the first connecting component is connected between the first layer and the third layer, and the second connecting component is connected between the second layer and the fourth layer, the projected area of ​​the second layer along the third direction is smaller than the projected area of ​​the first layer along the third direction, and / or the projected area of ​​the fourth layer along the third direction is smaller than the projected area of ​​the third layer along the third direction.

12. The battery device according to any one of claims 1 to 6, characterized in that, The busbar component is a one-piece molded structure.

13. The battery device according to any one of claims 1 to 6, characterized in that, The first connecting component and the second connecting component are made of different materials. Wherein, the elongation of the first connecting component is greater than the elongation of the second connecting component, and / or, the tensile strength of the first connecting component is greater than the tensile strength of the second connecting component.

14. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-13.

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