Battery device and electric device

Abstract

The embodiment of the utility model discloses a battery device and a power utilization device. The battery device includes: a plurality of battery cells; the plurality of confluence components are used for being electrically connected with the plurality of battery monomers, the plurality of confluence components comprise a first confluence component, the first confluence component is electrically connected with electrode terminals of at least two battery monomers in the plurality of battery monomers, and the first confluence component comprises a fusing part; the fusing part is positioned on an overcurrent path between the two electrode terminals connected with the first convergence component; the fusing part comprises a first part and a second part which are connected with each other, the melting point T1 of the first part and the melting point T2 of the second part meet the condition that T2 is more than or equal to 150 DEG C and less than or equal to 700 DEG C, and the fusing part is configured to be that the open area of the fusing part is reduced under the condition that the second part is fused. According to the battery device and the power utilization device provided by the embodiment of the invention, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. Amidst the rapid advancements in battery technology, improving the safety performance of battery devices is a pressing technical challenge. Utility Model Content

[0003] The embodiments of the present application provide a battery device and an electrical device, which can improve the reliability of the battery device.

[0004] In a first aspect, a battery device is provided, comprising: a plurality of battery cells; a plurality of busbars for electrically connecting the plurality of battery cells, the plurality of busbars including a first busbar, the first busbar being electrically connected to electrode terminals of at least two of the plurality of battery cells, the first busbar including a fuse, the fuse being located on an overcurrent path between the two electrode terminals connected to the first busbar; the fuse comprising a first portion and a second portion that are connected, the melting point T1 of the first portion and the melting point T2 of the second portion satisfying: 150°C ≤ T2 < T1 ≤ 700°C, and the fuse being configured such that when the second portion melts, the overcurrent area of ​​the fuse becomes smaller.

[0005] Therefore, the battery device of the embodiment of the present application is provided with a first portion and a second portion having different melting points. On the one hand, under normal use of the battery cells, the melting point T1 of the first portion and the melting point T2 of the second portion are both greater than or equal to 150°C and are not easily melted. The first portion and the second portion can be used together to achieve electrical connection between at least two battery cells, ensuring that the flow capacity of the first busbar component meets design requirements. On the other hand, the melting point T2 of the second portion is set to be lower than the melting point T1 of the first portion, and both are less than or equal to 700°C. Then, when the temperature of the battery cell rises above the melting point of the second portion, for example, in the event of thermal runaway of the battery cell, the second portion can melt rapidly, thereby reducing the flow area of ​​the fuse section of the first busbar component and reducing the flow capacity of the first busbar component. This can accelerate the melting of the fuse section, thereby promptly disconnecting the electrical connection between the at least two battery cells, reducing the risk of continued severe short circuit behavior under thermal runaway conditions, or severing an external short circuit, thereby improving the reliability of the battery device.

[0006] In some embodiments, the conductivity of the first portion is greater than that of the second portion, so that when the battery cell is in normal use, the conventional overflow function is mainly improved through the first portion, so that the overflow capacity of the first current collecting component meets the design requirements.

[0007] In some embodiments, the volume of the first portion is greater than the volume of the second portion. During normal battery cell operation, the large-area first portion easily meets overcurrent requirements. However, in the event of thermal runaway of the battery cell, the smaller-area second portion can melt more quickly, promptly severing the electrical connection between the at least two battery cells connected to the first current collector. Alternatively, the melted second portion can reduce the overcurrent area of ​​the first current collector, lowering the overcurrent capacity of the first current collector, thereby accelerating the fusing of the first portion and promptly severing the electrical connection between the at least two battery cells.

[0008] In some embodiments, the fuse is configured to disconnect the electrical connection between the at least two battery cells when the second part melts. When the battery cells are in normal use, both the first part and the second part can be used to achieve electrical connection between at least two battery cells, so that the flow capacity of the first busbar component meets the design requirements. When the temperature of the battery cell rises, the second part has a lower melting point and can melt faster. After the second part melts, the flow area of ​​the fuse is reduced to zero, that is, the fuse is blown, and the electrical connection between the at least two battery cells connected to the first busbar component can be disconnected in time, which can more quickly reduce the risk of continued occurrence of severe short-circuit behavior under thermal runaway conditions, or cut off the external short-circuit loop, thereby improving the reliability of the battery device.

[0009] In some embodiments, the at least two battery cells include a first electrode terminal, the second portion is disposed corresponding to the first electrode terminal, the first portion surrounds the second portion, and the first portion is configured to be electrically connected to the first electrode terminal through the second portion. The second portion is closer to the first electrode terminal, and the temperature near the first electrode terminal is higher, which facilitates timely melting of the second portion. When the second portion melts, the second portion, which is disposed corresponding to the first electrode terminal, is electrically disconnected from the first electrode terminal, and the first portion is unable to electrically connect to the first electrode terminal through the second portion. This allows for timely disconnection of the first busbar component from the first electrode terminal, thereby further disconnecting the at least two battery cells connected to the first busbar component.

[0010] In some embodiments, a first protrusion structure protruding toward the first part is provided on the side of the second part facing the first part. Along the thickness direction of the first convergence component, the first protrusion structure is clamped in the middle of the first part to increase the contact area between the first part and the second part, reduce the contact resistance, and also reduce the risk of movement between the first part and the second part along the thickness direction of the first convergence component, thereby improving the structural stability.

[0011] In some embodiments, the at least two battery cells include a second electrode terminal, the first portion includes a first area and a second area, the second area is arranged corresponding to the second electrode terminal, the second portion surrounds the second area, the first area surrounds the second portion, and the second area is electrically connected to the first area through the second portion. The second area of ​​the first portion is arranged corresponding to the second electrode terminal, the melting point of the first portion is relatively high, and the melting point of the second electrode terminal is generally also relatively high, which facilitates welding and fixing between the second area and the second electrode terminal, and improves the connection reliability between the second area and the second electrode terminal. If a second portion is provided between the first area and the second area of ​​the first portion, then when the second portion melts, the first area cannot be electrically connected to the second area through the second portion, and therefore cannot be electrically connected to the first electrode terminal, and the electrical connection between the first busbar component and the first electrode terminal can be promptly disconnected, thereby disconnecting the electrical connection between the at least two battery cells connected to the first busbar component.

[0012] In some embodiments, a first protrusion structure protruding toward the first region is provided on a side of the second portion facing the first region, and the first protrusion structure is clamped in the middle of the first portion along the thickness direction of the first flow-collecting component; and / or a second protrusion structure protruding toward the second region is provided on a side of the second portion facing the second region, and the second protrusion structure is clamped in the middle of the first portion along the thickness direction of the first flow-collecting component. The first protrusion structure can increase the contact area between the first region and the second portion, and the second protrusion structure can increase the contact area between the second region and the second portion, thereby reducing contact resistance. Furthermore, the first and second protrusion structures can also reduce the risk of movement between the first and second portions along the thickness direction of the first flow-collecting component, thereby improving structural stability.

[0013] In some embodiments, the first portion includes a third region and a fourth region, each of which is used to connect the electrode terminals of different battery cells among the at least two battery cells. The second portion is located between the third region and the fourth region, and the third region is used to electrically connect to the fourth region through the second portion. The first busbar connects the electrode terminals of different battery cells through the third and fourth regions, respectively, so that the first busbar has a relatively continuous flow path with each electrode terminal, reducing the impact of the second portion on the flow capacity. That is, the second portion can improve the flow capacity of the first busbar under normal operating conditions. The flow capacity of the second portion can also be adjusted by adjusting the thickness and other dimensions of the second portion, thereby adjusting the flow capacity of the first busbar. In high-temperature environments such as thermal runaway or external short circuits, the second portion melts, which can quickly cause the first busbar to fuse and promptly disconnect the electrical connection between the at least two battery cells.

[0014] In some embodiments, a third protrusion structure protruding toward the third region is provided on a side of the second portion facing the third region; the third protrusion structure is clamped in the middle of the first portion along the thickness direction of the first conduit component; and / or a fourth protrusion structure protruding toward the fourth region is provided on a side of the second portion facing the fourth region; the fourth protrusion structure is clamped in the middle of the first portion along the thickness direction of the first conduit component. The third protrusion structure can increase the contact area between the third region and the second portion, and the fourth protrusion structure can increase the contact area between the fourth region and the second portion, thereby reducing contact resistance. Furthermore, the third and fourth protrusion structures can reduce the risk of movement between the first and second portions along the thickness direction of the first conduit component, thereby improving structural stability.

[0015] In some embodiments, the fuse is configured to maintain the electrical connection between the at least two battery cells when only the second portion melts, and to disconnect the electrical connection between the at least two battery cells when both the first and second portions melt. During normal battery cell operation, both the first and second portions can be used to electrically connect the at least two battery cells, thereby improving the current-carrying capacity of the first busbar component to meet design requirements. When the battery cell temperature rises, the second portion, due to its lower melting point, melts more quickly. After the second portion melts, if the first portion has not yet melted, the fuse can still electrically connect the at least two battery cells via the first portion. However, the reduced area of ​​the fuse reduces the current-carrying capacity of the first busbar component, increasing the temperature of the first portion and accelerating its melting. Subsequently, if the first portion also melts, the fuse opens, promptly disconnecting the electrical connection between the at least two battery cells connected to the first busbar component. This reduces the risk of a further severe short circuit under thermal runaway conditions, or disconnects an external short circuit, thereby improving the reliability of the battery device.

[0016] In some embodiments, the first busbar component includes a first connection area and a second connection area, and the first connection area and the second connection area are respectively used to connect the electrode terminals of different battery cells among the at least two battery cells; along the length direction of the first busbar component, the fuse part is located between the first connection area and the second connection area, and the first connection area is used to be electrically connected to the second connection area through the fuse part.

[0017] The first current collector connects the electrode terminals of different battery cells through the first connection area and the second connection area, respectively. The first portion and the second portion are both located between the first connection area and the second connection area, thereby providing the first current collector with a relatively continuous flow path and reducing the impact of the second portion on the flow capacity. Specifically, the second portion can improve the flow capacity of the first current collector under normal operating conditions. The flow capacity of the second portion can also be adjusted by adjusting the thickness, length, and other dimensions of the second portion, thereby adjusting the flow capacity of the first current collector. However, in high-temperature environments such as thermal runaway or external short circuits, the second portion rapidly melts, reducing the flow area of ​​the fuse portion, rapidly reducing the flow capacity of the first current collector, causing the temperature of the first portion to rise, accelerating the melting of the first portion, and thus enabling the first current collector to quickly fuse at the first portion, i.e., the fuse portion fuses, thereby promptly disconnecting the electrical connection between at least two battery cells.

[0018] In some embodiments, the first portion includes a first fusible link extending along the length of the first busbar, the first fusible link connecting the first connection region and the second connection region. The second portion includes a second fusible link extending along the length of the first busbar, the second fusible link connecting the first connection region and the second connection region. Because both the first and second fusible links can connect the first and second connection regions, the current carrying capacity of the first busbar can be improved under normal operating conditions. However, in high-temperature environments such as thermal runaway or external short circuits, the second fusible link will quickly melt, reducing the flow area of ​​the fusible link to that of the first fusible link, thereby rapidly reducing the flow capacity of the first busbar. While the current remains unchanged, the remaining first fusible link generates more heat. As the temperature further rises, the first fusible link subsequently melts, causing the entire fusible link to fuse, promptly severing the electrical connection between at least two battery cells.

[0019] In some embodiments, the first portion includes a plurality of first fusible links, and / or the second portion includes a plurality of second fusible links. Providing multiple first fusible links can reduce the size and strength of each first fusible link, thereby accelerating the fusing of the first fusible link. Similarly, providing multiple second fusible links can also reduce the size and strength of each second fusible link, thereby accelerating the fusing of the second fusible link.

[0020] In some embodiments, each first fusible link is connected to at least one second fusible link; and each second fusible link is connected to at least one first fusible link. The interconnection between the first and second fusible links can improve the flow capacity of the first current converging component when the battery cells are operating normally, and can also increase the heat transfer speed in high-temperature environments such as thermal runaway or external short circuits, thereby accelerating the melting of the fusible link.

[0021] In some embodiments, the first portion includes a plurality of first fusible links, and the second portion includes a plurality of second fusible links. The plurality of first fusible links and the plurality of second fusible links are arranged alternately along the width of the first busbar. The plurality of first fusible links in the first portion are relatively evenly distributed, which can reduce the risk of large temperature differences between different areas of the first portion and improve the reliability of the first busbar.

[0022] In some embodiments, a fifth protrusion structure protruding toward the first connection region is provided on a side of the second fusible link facing the first connection region; the fifth protrusion structure is clamped in the middle of the first portion along the thickness direction of the first busbar; and / or a sixth protrusion structure protruding toward the second connection region is provided on a side of the second fusible link facing the second connection region; the sixth protrusion structure is clamped in the middle of the first portion along the thickness direction of the first busbar. The fifth protrusion structure can increase the contact area between the first connection region and the second fusible link, and the sixth protrusion structure can increase the contact area between the second connection region and the second fusible link, thereby reducing contact resistance. Furthermore, the fifth and sixth protrusion structures can reduce the risk of movement between the first portion and the second fusible link along the thickness direction of the first busbar, thereby improving structural stability.

[0023] In some embodiments, the second part includes two second fusible links. Along the thickness direction of the first busbar component, the first fusible link is clamped between the two second fusible links. The structure is simple and easy to implement, and the thickness of the first fusible link located in the middle area is thinner. When the two second fusible links melt first, the flow area of ​​the fuse is first reduced to the flow area of ​​the first fusible link. When the current remains unchanged, the heat generated by the remaining first fusible link of the fuse increases, and the temperature further rises, and then the first fusible link is subsequently melted, and then the fuse is melted as a whole, so as to timely disconnect the electrical connection of at least two battery cells.

[0024] In some embodiments, the first fusible link is provided with a through hole, and the second portion further includes a third fusible link, which is received in the through hole and connects the two second fusible links. The third fusible link can improve the connection stability between the first portion and the second portion, thereby improving the structural stability of the first busbar component.

[0025] In some embodiments, the first fusible link is provided with a plurality of through holes arranged along the width direction of the first busbar component, and the second part includes a plurality of third fusible links arranged along the width direction of the first busbar component. The plurality of through holes correspond one-to-one to the plurality of third fusible links, and the structural stability of the first busbar component is improved when the flow capacity of the first busbar component meets the design requirements.

[0026] In some embodiments, the at least two battery cells include a first battery cell and a second battery cell, the first busbar component is used to connect the first battery cell and the second battery cell in series, and the fuse is arranged on the overcurrent path between the first battery cell and the second battery cell to facilitate timely disconnection of the first battery cell and the second battery cell connected in series.

[0027] In some embodiments, the at least two battery cells also include a third battery cell and a fourth battery cell, and the first bus component is also used to connect the third battery cell and the first battery cell in parallel, and to connect the second battery cell and the fourth battery cell in parallel. By realizing series and parallel connection through the first bus component, the connection flexibility between the battery cells can be improved, so that the battery device meets different design requirements.

[0028] In some embodiments, the first busbar component is provided with a plurality of such fuse parts, wherein the fuse part is also provided on the overcurrent path between the third battery cell and the first battery cell, thereby improving the reliability between the third battery cell and the first battery cell; or, the fuse part is also provided on the overcurrent path between the second battery cell and the fourth battery cell, thereby improving the reliability between the second battery cell and the fourth battery cell.

[0029] In some embodiments, the at least two battery cells include a first battery cell, a second battery cell, a third battery cell and a fourth battery cell; the first busbar component is used to connect the first battery cell and the second battery cell in series, the third battery cell and the first battery cell in parallel, and the second battery cell and the fourth battery cell in parallel; wherein the fuse is arranged on the overcurrent path between the third battery cell and the first battery cell, thereby improving the reliability between the third battery cell and the first battery cell; or, the fuse is arranged on the overcurrent path between the second battery cell and the fourth battery cell, thereby improving the reliability between the second battery cell and the fourth battery cell.

[0030] In some embodiments, the first part and the second part are fixedly connected by at least one of the following methods: casting, welding, clamping, and hot and cold rolling. These fixing methods are easy to implement and can improve the stability between the first part and the second part, thereby improving the reliability of the first convergence component.

[0031] In some embodiments, the material of the first portion includes an aluminum alloy; and / or the material of the second portion includes at least one of the following: bismuth, tin, lead, indium, and alloys thereof. These materials are easy to process, have reasonable costs, and readily meet the design requirements of the first and second portions of the embodiments of the present application.

[0032] In a second aspect, an electrical device is provided, comprising: the battery device described in the first aspect or any one embodiment of the first aspect, wherein the battery device is used to store or provide electrical energy.

[0033] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a vehicle according to an embodiment of the present application;

[0035] Figure 2 This is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0036] Figure 3 A schematic diagram of a partial structure of a battery device according to an embodiment of the present application;

[0037] Figure 4 This is a schematic structural diagram of a first confluence component according to an embodiment of the present application;

[0038] Figure 5 This is a schematic diagram of the exploded structure of a first confluence component according to one embodiment of the present application;

[0039] Figure 6 This is a schematic top view of a first conduit component according to an embodiment of the present application;

[0040] Figure 7 This is a schematic cross-sectional structural diagram of a first busbar component and a first electrode terminal according to an embodiment of the present application;

[0041] Figure 8 This is a partial enlarged cross-sectional schematic diagram of a first busbar component and a first electrode terminal according to an embodiment of the present application;

[0042] Figure 9 Another partial enlarged cross-sectional schematic diagram of the first busbar component and the first electrode terminal according to one embodiment of the present application;

[0043] Figure 10 This is a schematic structural diagram of a first confluence component according to another embodiment of the present application;

[0044] Figure 11 This is a schematic diagram of the exploded structure of a first conduit component according to another embodiment of the present application;

[0045] Figure 12 This is a schematic top view of a first busbar component according to another embodiment of the present application;

[0046] Figure 13 This is a schematic cross-sectional structural diagram of a first busbar component and a second electrode terminal according to another embodiment of the present application;

[0047] Figure 14 This is a partial enlarged cross-sectional schematic diagram of a first busbar component and a second electrode terminal according to another embodiment of the present application;

[0048] Figure 15 This is another partial enlarged cross-sectional schematic diagram of the first busbar component and the second electrode terminal according to another embodiment of the present application;

[0049] Figure 16 This is a structural schematic diagram of a first confluence component according to another embodiment of the present application;

[0050] Figure 17 This is a schematic diagram of the exploded structure of a first confluence component according to another embodiment of the present application;

[0051] Figure 18 This is a schematic top view of a first confluence component according to another embodiment of the present application;

[0052] Figure 19 This is a schematic cross-sectional structural diagram of a first busbar component and an electrode terminal according to yet another embodiment of the present application;

[0053] Figure 20 This is an enlarged partial cross-sectional view of a first conduit component according to another embodiment of the present application;

[0054] Figure 21 This is another partial enlarged cross-sectional schematic diagram of a first conduit component according to yet another embodiment of the present application;

[0055] Figure 22 This is a structural schematic diagram of a first confluence component according to another embodiment of the present application;

[0056] Figure 23 This is a schematic diagram of the exploded structure of a first confluence component according to another embodiment of the present application;

[0057] Figure 24 This is a schematic top view of a first confluence component according to another embodiment of the present application;

[0058] Figure 25 This is a schematic cross-sectional structural diagram of a first busbar component and an electrode terminal according to yet another embodiment of the present application;

[0059] Figure 26 This is an enlarged partial cross-sectional view of a first conduit component according to another embodiment of the present application;

[0060] Figure 27 This is another partial enlarged cross-sectional schematic diagram of a first conduit component according to yet another embodiment of the present application;

[0061] Figure 28 This is a structural schematic diagram of a first confluence component according to another embodiment of the present application;

[0062] Figure 29 This is a schematic diagram of the exploded structure of a first confluence component according to another embodiment of the present application;

[0063] Figure 30 This is a schematic top view of a first confluence component according to another embodiment of the present application;

[0064] Figure 31 This is a schematic cross-sectional structural diagram of a first busbar component and an electrode terminal according to yet another embodiment of the present application;

[0065] Figure 32 This is a schematic diagram of the exploded structure of a first confluence component according to another embodiment of the present application;

[0066] Figure 33 This is a schematic cross-sectional structural diagram of a first confluence component according to another embodiment of the present application;

[0067] Figure 34 A schematic diagram of a partial structure of a battery device according to another embodiment of the present application;

[0068] Figure 35 This is a schematic diagram of a partial structure of a battery device according to another embodiment of the present application;

[0069] Figure 36 This is a schematic diagram of a partial structure of a battery device according to another embodiment of the present application;

[0070] Figure 37 This is a schematic diagram of the partial structure of a battery device according to another embodiment of the present application.

[0071] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0073] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0075] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0077] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0078] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0079] The term "multiple" in this application 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).

[0080] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0081] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0082] 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.

[0083] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0084] The battery apparatus 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 multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0085] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0086] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0087] 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 housed in the case.

[0088] 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.

[0089] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0090] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0091] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0092] 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.

[0093] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0094] Multiple battery cells within a battery device are typically connected in series, parallel, or in mixed circuits via busbars. If a short circuit or thermal runaway occurs in any of the battery cells within the device, the cell gradually becomes a resistor. This resistor, connected to the adjacent cells via the busbars, forms a short-circuit loop, creating a new heat source. This can lead to heat diffusion within the battery device, causing thermal runaway in more cells and even explosion.

[0095] Therefore, embodiments of the present application provide a battery device and an electrical device that can solve the above-mentioned problems. The battery device of the embodiments of the present application includes multiple battery cells and multiple busbars, wherein the busbar is used to electrically connect the multiple battery cells. The multiple busbars include a first busbar, which is electrically connected to the electrode terminals of at least two of the multiple battery cells. The first busbar includes a fuse located in the current path between the two electrode terminals connected to the first busbar. The fuse includes a first portion and a second portion. The melting points T1 and T2 of the first portion satisfy the following relationship: 150°C ≤ T2 < T1 ≤ 700°C. When the second portion melts, the current flow area of ​​the fuse decreases. Thus, during normal use of the battery cells, the melting points T1 and T2 of the first portion and the second portion are both greater than or equal to 150°C, making them less likely to melt. The first and second portions can be used together to achieve electrical connection between at least two battery cells, ensuring that the current flow capacity of the first busbar meets design requirements. On the other hand, the melting point T2 of the second part is set to be lower than the melting point T1 of the first part, and both are less than or equal to 700°C. Then, when the temperature of the battery cell rises to exceed the melting point of the second part, for example, in the event of thermal runaway of the battery cell, the second part can melt quickly to reduce the flow area of ​​the fuse part of the first busbar component, reduce the flow capacity of the first busbar component, and thus accelerate the melting of the fuse part, so as to timely disconnect the electrical connection between at least two battery cells, reduce the risk of continued occurrence of severe short-circuit behavior under thermal runaway conditions, or cut off the external short-circuit loop, and improve the reliability of the battery device.

[0096] The technical solutions described in the embodiments of this application are applicable to various electrical devices using battery devices. For the convenience of explanation, the following embodiments are described using a vehicle as an electrical device.

[0097] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery device 10 to power the motor 40. For example, a battery device 10 can be provided at the bottom, front or rear of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0098] Figure 2 FIG. 1 shows a schematic diagram of the exploded structure of the battery device 10 according to an embodiment of the present application. Figure 2 As shown, the battery device 10 according to the embodiment of the present application includes: a plurality of battery cells 20 and a plurality of busbar components 12 . Figure 3 A partial structural diagram of a battery device 10 according to an embodiment of the present application is shown, for example, Figure 3 Shown as Figure 2 The structure diagram of any two battery cells 20 in the battery device 10 electrically connected through the same busbar component 12 is shown. Figure 4 A possible structural diagram of the first confluence component 120 among the multiple confluence components 12 in the embodiment of the present application is shown, for example, Figure 4 The first busbar 120 shown may be Figure 2 The battery device 10 shown includes any one of the busbar components 12 . Figure 5 FIG. 1 shows a schematic diagram of the exploded structure of the first confluence component 120 according to an embodiment of the present application, for example, Figure 5 The first conduit component 120 shown can be as follows Figure 4 The first busbar component 120 is shown. Figure 6 FIG. 1 shows a schematic top view of the first confluence component 120 according to an embodiment of the present application, for example, Figure 6 The first conduit component 120 shown can be as follows Figure 4 and Figure 5 The first busbar component 120 is shown. Figure 7 The cross-sectional view of the first busbar component 120 and the first electrode terminal 2011 of the embodiment of the present application is shown, for example, Figure 7 Shown along Figure 6 The cross-sectional view along the AA' direction is shown. Figure 8 A partial cross-sectional diagram of the first busbar component 120 and the first electrode terminal 2011 according to an embodiment of the present application is shown. For example, Figure 8 You can Figure 7 An enlarged view of area B in the cross-sectional view is shown.

[0099] like Figures 2 to 8As shown, a plurality of busbar components 12 are used to electrically connect the plurality of battery cells 20, and the plurality of busbar components 12 include a first busbar component 120, which is electrically connected to the electrode terminals 201 of at least two battery cells 20 among the plurality of battery cells 20, and the first busbar component 120 includes a fuse 125, which is located on the overcurrent path between the two electrode terminals 201 connected to the first busbar component 120; the fuse 125 includes a first part 121 and a second part 122 connected to each other, and the melting point T1 of the first part 121 and the melting point T2 of the second part 122 satisfy: 150°C≤T2<T1≤700°C, and the fuse 125 is configured so that when the second part 122 melts, the overcurrent area of ​​the fuse 125 becomes smaller.

[0100] The battery device 10 of the embodiment of the present application may include a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application can be set according to the actual application. For example, the battery cell 20 can be as follows Figure 2 The rectangular parallelepiped shown, or it can be different from Figure 2 The cylindrical or other shapes shown are not limited to these embodiments of the present application.

[0101] It should be understood that Figure 2 As shown, the battery device 10 of the embodiment of the present application may further include a box body 11, which may be used to accommodate a plurality of battery cells 20 and a plurality of conduit components 12. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 and a plurality of conduit components 12 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are buckled together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated therein, for example, they may be determined according to the shape of the combination of the plurality of battery cells 20 accommodated therein, and at least one of the first box body part 111 and the second box body part 112 may have an opening. For example, as Figure 2 As shown, only one of the first and second housing portions 111, 112 may be a hollow rectangular parallelepiped with an opening, while the other may be a plate-shaped structure to cover the opening. For example, if the second housing portion 112 is a hollow rectangular parallelepiped with an opening, and the first housing portion 111 is a plate-shaped structure, the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 having a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 can be connected in parallel, in series, or in a mixed combination using multiple conduit components 12 and then placed within the housing 11 formed by the first and second housing portions 111, 112 being fastened together.

[0102] For example, unlike Figure 2 As shown, the first box body portion 111 and the second box body portion 112 can both be hollow rectangular parallelepipeds and each has an open surface. The opening of the first box body portion 111 and the opening of the second box body portion 112 are arranged opposite to each other, and the first box body portion 111 and the second box body portion 112 are interlocked to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0103] The battery cell 20 of the embodiment of the present application may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly inside the battery cell, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0104] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, and a polygonal battery such as a hexagonal battery. There is no special limitation in this application.

[0105] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0106] For ease of description, the embodiments of the present application mainly take a rectangular battery device 10 as an example, and the battery device 10 includes a rectangular battery cell 20. In addition, for ease of description, the embodiments of the present application define three reference directions for the rectangular battery device 10. The length direction of the battery device 10 is direction X, the width direction of the battery device 10 is direction Y, and the height direction of the battery device 10 is direction Z. The length direction X, width direction Y, and height direction Z of the battery device 10 are perpendicular to each other, and the width direction Y of the battery device 10 is smaller than the length direction X.

[0107] The battery cell 20 is provided with an electrode terminal 201. In the embodiment of the present application, the electrode terminal 201 is electrically connected to the tab to output electrical energy. For example, the electrode terminal 201 can be directly connected to the tab or indirectly connected to the tab via a current collecting member. It should be understood that the electrode terminal 201 can be located on any wall of the battery cell 20. For example, the electrode terminal 201 can be located on any wall of the housing or on any wall of the end cap, but the embodiment of the present application is not limited to this.

[0108] The battery device 10 of an embodiment of the present application may include a plurality of busbar components 12, wherein the plurality of busbar components 12 include a first busbar component 120, and the first busbar component 120 may be any one of the plurality of busbar components 12, and the first busbar component 120 is electrically connected to the electrode terminals 201 of at least two battery cells 20 in the battery device 10 to achieve electrical connection between the at least two battery cells 20.

[0109] The first busbar component 120 of the embodiment of the present application includes a fuse part 125, which is located on the overcurrent path between the two electrode terminals 201 connected to the first busbar component 120. When the fuse part 125 melts, the electrical connection between the battery cells 20 connected to the first busbar component 120 can be disconnected.

[0110] The fuse 125 of the embodiment of the present application includes a first portion 121 and a second portion 122 connected to each other. The first portion 121 and the second portion 122 are made of different materials, and the melting points T1 and T2 of the first portion 121 and the second portion 122 satisfy the following relationship: 150°C ≤ T2 < T1 ≤ 700°C. Thus, during normal use of the battery cells 20, the melting points T1 and T2 of the first portion 121 and the second portion 122 are both greater than or equal to 150°C, making them less likely to melt. The first portion 121 and the second portion 122 can be used together to achieve electrical connection between at least two battery cells 20, ensuring that the current carrying capacity of the first busbar 120 meets design requirements. On the other hand, the melting point T2 of the second part 122 is set to be lower than the melting point T1 of the first part 121, and both are less than or equal to 700°C. Then, when the temperature of the battery cell 20 rises to exceed the melting point of the second part 122, for example, when the battery cell 20 suffers from thermal runaway, the second part 122 can melt quickly to reduce the flow area of ​​the fuse part 125 of the first convergence component 120, reduce the flow capacity of the first convergence component 120, and thus accelerate the melting of the fuse part 125, so as to timely disconnect the electrical connection between at least two battery cells 20, reduce the risk of continued occurrence of severe short-circuit behavior under thermal runaway conditions, or cut off the external short-circuit loop, and improve the reliability of the battery device 10.

[0111] It should be understood that the first current-conducting component 120 of the embodiment of the present application may further include a third portion 123, which is the portion of the first current-conducting component 120 excluding the fuse portion 125. In some embodiments, the material of the third portion 123 may be the same as that of the first portion 121. For example, the third portion 123 may be integrally formed with at least a portion of the first portion 121 to achieve electrical connection between at least two battery cells 20 when the battery cells 20 are in normal use, thereby ensuring that the current-carrying capacity of the first current-conducting component 120 meets design requirements.

[0112] It should be understood that the melting point T1 of the first portion 121 of the embodiment of the present application can be selected based on the actual application, and the melting point T2 of the second portion 122 can also be selected based on the actual application. For example, the melting point T1 of the first portion 121 is typically in the range of [500°C, 700°C] or [600°C, 700°C]; for another example, the melting point T2 of the second portion 122 is typically in the range of [150°C, 600°C], but the embodiment of the present application is not limited to this.

[0113] In some embodiments, the melting point T1 of the first part 121 can also be any one of the following values, or between any two of the following values: 500°C, 530°C, 550°C, 580°C, 600°C, 610°C, 620°C, 630°C, 640°C, 650°C, 660°C, 670°C, 680°C, 690°C or 700°C.

[0114] In some embodiments, the melting point T2 of the second part 122 can also be any one of the following values, or between any two of the following values: 150°C, 180°C, 200°C, 230°C, 250°C, 280°C, 300°C, 330°C, 350°C, 380°C, 400°C, 430°C, 450°C, 480°C, 500°C, 530°C, 550°C, 580°C or 600°C.

[0115] It should be understood that the battery cell 20 in the embodiment of the present application may also be provided with other components. For example, the battery cell 20 is provided with a pressure relief mechanism 202 for discharging the internal gas of the battery cell 20 .

[0116] For example, when the internal pressure or temperature of a battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 202 actuates to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 202 actuates or a weakened structure within the pressure relief mechanism 202 is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell 20.

[0117] It should be understood that the pressure relief mechanism 202 of the embodiment of the present application can be disposed on any wall of the housing. For example, the electrode terminals 201 of the battery cells 20 can be located on the same wall as the pressure relief mechanism 202 for ease of installation. When the pressure relief mechanism 202 is actuated, the first busbar 120 connected to the electrode terminals 201 located near the pressure relief mechanism 202 can be promptly fused to disconnect the high-voltage connection, reducing the risk of short circuits between the battery cells 20 and improving the reliability of the battery device 10.

[0118] As an example, the pressure relief mechanism 202 may be integrally formed with the housing.

[0119] As an example, the pressure relief mechanism 202 may also be provided separately from and connected to the housing.

[0120] The "activation" mentioned in this application means that the pressure relief mechanism 202 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action generated by the pressure relief mechanism 202 may include but is not limited to: the components in the pressure relief mechanism 202 move to form an exhaust channel, at least a part of the pressure relief mechanism 202 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 202 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0121] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism 202 can be configured as a through hole for discharging gas inside the battery cell 20 .

[0122] The emissions from the battery cells 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0123] In some embodiments, the battery device 10 of the embodiment of the present application may further be provided with a fixing member 13 for fixing the plurality of battery cells 20. Specifically, as shown in FIG. Figures 2 to 8As shown, the battery device 10 includes a plurality of battery cells 20. For example, the battery device 10 includes a plurality of battery cells 20 arranged along the length direction X of the battery device 10. The fixing member 13 can be used to fix the plurality of battery cells 20 arranged along the length direction X of the battery device 10. Furthermore, the battery device 10 can also include a plurality of columns of battery cells 20 arranged along the width direction Y of the battery device 10. Two adjacent columns of battery cells 20 can be fixed by the same fixing member 13, thereby reducing the number of fixing members 13 and facilitating installation.

[0124] It should be understood that the fixing member 13 of the embodiment of the present application can be implemented by various structures. Figures 2 to 8 As shown, the fixing member 13 of the embodiment of the present application can be a strip-shaped structure. For example, the fixing member 13 can be a pressure strip, which is arranged on the top surface of the battery cell 20 and is used to compress and fix the battery cell 20. Alternatively, the fixing member 13 can also be a beam inside the box body 11, and the side of the beam facing the first box body portion 111 is the fixing member 13 to fix the battery cell 20. The embodiment of the present application is not limited to this.

[0125] In some embodiments, the conductivity of the first part 121 is greater than the conductivity of the second part 122, so that when the battery cell 20 is in normal use, the conventional overcurrent function is mainly improved through the first part 121, so that the overcurrent capacity of the first busbar component 120 meets the design requirements.

[0126] In some embodiments, the volume of the first part 121 is larger than the volume of the second part 122. In this way, when the battery cell 20 is in normal use, the large-area first part 121 can easily meet the overcurrent requirement, and when the battery cell 20 has thermal runaway, the small-area second part 122 can melt faster and promptly disconnect the electrical connection between at least two battery cells 20 connected to the first busbar 120, or after the second part 122 melts, it can reduce the overcurrent area of ​​the first busbar 120 and reduce the overcurrent capacity of the first busbar 120, thereby accelerating the melting of the first part 121 and promptly disconnecting the electrical connection between at least two battery cells 20.

[0127] It should be understood that the materials used for the first and second parts 121, 122 of the present embodiment are different, and their specific materials can be customized based on the actual application. For example, the material for the first part 121 includes an aluminum alloy; and / or the material for the second part 122 includes at least one of the following: bismuth, tin, lead, indium, and their alloys. These materials are easy to process, cost-effective, and readily meet the design requirements for the first and second parts 121, 122 of the present embodiment.

[0128] It should be understood that the first portion 121 and the second portion 122 of the embodiment of the present application can be fixedly connected in a variety of ways. For example, the first portion 121 and the second portion 122 can be fixedly connected by at least one of the following methods: casting, welding, clamping, and hot or cold rolling. These fixing methods are easy to implement and can improve the stability between the first portion 121 and the second portion 122, thereby improving the reliability of the first conduit component 120.

[0129] It should be understood that the specific structure of the fuse part 125 in the embodiment of the present application can be set according to actual application.

[0130] In some embodiments, the fuse 125 is configured to disconnect the electrical connection between at least two battery cells 20 when the second portion 122 melts. When the battery cells 20 are in normal use, both the first portion 121 and the second portion 122 can be used to achieve electrical connection between at least two battery cells 20, so that the flow capacity of the first busbar 120 meets design requirements. When the temperature of the battery cells 20 rises, the second portion 122 has a lower melting point T2 and can melt faster. After the second portion 122 melts, the flow area of ​​the fuse 125 is reduced to zero, that is, the fuse 125 melts, which can promptly disconnect the electrical connection between the at least two battery cells 20 connected to the first busbar 120, quickly reducing the risk of continued severe short-circuiting behavior under thermal runaway conditions, or cutting off the external short-circuit loop, thereby improving the reliability of the battery device 10.

[0131] The specific structure of the second portion 122 of the embodiment of the present application can be configured according to actual application, so that when the second portion 122 melts, it can disconnect the electrical connection between at least two battery cells 20 connected to the first busbar 120. For example, the second portion 122 can be located between the electrode terminal 201 and the first portion 121 to promptly disconnect the electrical connection between the first busbar 120 and the battery cell 20 where the electrode terminal 201 is located. For another example, the second portion 122 can be located between different regions of the first portion 121, so that the first portion 121 includes multiple disconnected regions, so that when the second portion 122 melts, the first busbar 120 can be partially fused.

[0132] In some embodiments, at least two battery cells 20 include a first electrode terminal 2011, the second portion 122 is disposed corresponding to the first electrode terminal 2011, the first portion 121 surrounds the second portion 122, and the first portion 121 is electrically connected to the first electrode terminal 2011 through the second portion 122. Figures 3 to 8As shown, the second portion 122 is provided corresponding to the first electrode terminal 2011, and the first portion 121 surrounds the second portion 122, that is, the first portion 121 is the portion of the first busbar component 120 close to the second portion 122. For example, the fuse portion 125 can be as follows Figure 4 and Figure 6 The area shown by the dotted line.

[0133] The second part 122 is closer to the first electrode terminal 2011, and the temperature near the first electrode terminal 2011 is higher, which helps the second part 122 to melt in time; when the second part 122 melts, the second part 122 corresponding to the first electrode terminal 2011 is disconnected from the electrical connection with the first electrode terminal 2011, and the first part 121 cannot be electrically connected to the first electrode terminal 2011 through the second part 122, so that the electrical connection between the first busbar component 120 and the first electrode terminal 2011 can be disconnected in time, and then the electrical connection between at least two battery cells 20 connected to the first busbar component 120 is disconnected.

[0134] like Figures 3 to 8 As shown, each of the at least two battery cells 20 connected to the first busbar component 120 of the embodiment of the present application may include a plurality of electrode terminals 201, the first busbar component 120 may be electrically connected to at least one electrode terminal 201 of each battery cell 20 of the at least two battery cells 20, the first electrode terminal 2011 may be any electrode terminal 201 of any one of the at least two battery cells 20, and the first busbar component 120 is electrically connected to the first electrode terminal 2011.

[0135] In an embodiment of the present application, the second part 122 is arranged corresponding to the first electrode terminal 2011, and the second part 122 can be used to be connected and fixed to the first electrode terminal 2011, so that the first busbar component 120 can be electrically connected to the first electrode terminal 2011 only through the second part 122. For example, the second part 122 can be welded and fixed to the first electrode terminal 2011. The welding area 2013 between the second part 122 and the first electrode terminal 2011 has a higher resistance and a higher temperature when overcurrent occurs. Especially when the battery cell 20 has thermal runaway, it is easier for the second part 122 to melt in time, so as to promptly disconnect the electrical connection between at least two battery cells 20 originally connected by the first busbar component 120.

[0136] Specifically, if Figures 3 to 8As shown, along the thickness direction of the first busbar 120, the second portion 122 is located on the side of the first electrode terminal 2011 away from the battery cell 20, and the two can be fixedly connected by penetration welding. In this embodiment of the present application, the thickness direction of the first busbar 120 is taken as the height direction Z of the battery device 10 as an example. In some embodiments, to facilitate penetration welding, the thickness of at least a portion of the second portion 122 can be thinned so that the thickness of the thinned area of ​​the second portion 122 is less than the thickness of the first portion 121, thereby improving welding efficiency. In some embodiments, the second portion 122 can also be provided with a positioning hole, for example, a positioning hole can be provided in the center of the second portion 122 to facilitate alignment of the second portion 122 and the first electrode terminal 2011 for welding.

[0137] It should be understood that the shape of the second portion 122 of the embodiment of the present application can be set according to the shape of the first electrode terminal 2011. For example, the shape of the second portion 122 can be consistent with the shape of the first electrode terminal 2011. Alternatively, the shape of the second portion 122 can also be inconsistent with the shape of the first electrode terminal 2011, but the area of ​​the surface of the second portion 122 facing the first electrode terminal 2011 is usually set to be similar to the area of ​​the surface of the first electrode terminal 2011 facing the second portion 122, for example, Figures 4 to 8 As shown, the area of ​​the surface of the second portion 122 facing the first electrode terminal 2011 can be set to be slightly larger than the area of ​​the surface of the first electrode terminal 2011 facing the second portion 122, or the area of ​​the surface of the second portion 122 facing the first electrode terminal 2011 can be set to be at least larger than the area of ​​the welding area 2013 of the first electrode terminal 2011, so as to facilitate welding and fixing of the two and improve welding stability.

[0138] It should be understood that the surface of the first part 121 facing the second part 122 and the surface of the second part 122 facing the first part 121 can both be flat for easy processing; or, other structures can be provided between the two to improve the structural stability of the first conduit component 120.

[0139] Figure 9 Another partial cross-sectional diagram of the first busbar component 120 and the first electrode terminal 2011 according to an embodiment of the present application is shown, for example, Figure 8 Can be Figure 7 Another possible enlarged view of the cross-sectional view of region B is shown in FIG. Figure 8As shown, a first protruding structure 1221 protruding toward the first part 121 is provided on the side of the second part 122 facing the first part 121. Along the thickness direction of the first convergence component 120, the first protruding structure 1221 is clamped in the middle of the first part 121 to increase the contact area between the first part 121 and the second part 122, reduce the contact resistance, and also reduce the risk of movement between the first part 121 and the second part 122 along the thickness direction of the first convergence component 120, thereby improving the structural stability.

[0140] Figure 10 Another possible structural diagram of the first confluence component 120 of the embodiment of the present application is shown, for example, Figure 10 The first busbar 120 shown may be Figure 2 The battery device 10 shown includes any one of the busbar components 12 . Figure 11 FIG. 1 shows a schematic diagram of the exploded structure of the first confluence component 120 according to an embodiment of the present application, for example, Figure 11 The first conduit component 120 shown can be as follows Figure 10 The first busbar component 120 is shown. Figure 12 FIG. 1 shows a schematic top view of the first confluence component 120 according to an embodiment of the present application, for example, Figure 12 The first conduit component 120 shown can be as follows Figure 10 and Figure 11 The first busbar component 120 is shown. Figure 13 The cross-sectional view of the first busbar component 120 and the second electrode terminal 2012 of the embodiment of the present application is shown, for example, Figure 13 Shown along Figure 12 Schematic cross-sectional view along the C-C' direction is shown. Figure 14 A partial cross-sectional diagram of the first busbar component 120 and the second electrode terminal 2012 of an embodiment of the present application is shown, for example, Figure 14 You can Figure 13 An enlarged view of area D in the cross-sectional view is shown.

[0141] In some embodiments, at least two battery cells 20 include a second electrode terminal 2012, the first portion 121 includes a first region 1211 and a second region 1212, the second region 1212 is arranged corresponding to the second electrode terminal 2012, the second portion 122 surrounds the second region 1212, the first region 1211 surrounds the second portion 122, and the second region 1212 is electrically connected to the first region 1211 through the second portion 122. Figures 10 to 14 As shown, the second portion 122 is located between the first region 1211 and the second region 1212. The first region 1211 is a portion of the first confluence component 120 close to the second portion 122. For example, the fuse portion 125 may be as follows: Figure 10 and Figure 12 The area shown by the dotted line.

[0142] The second region 1212 of the first portion 121 is provided to correspond to the second electrode terminal 2012. The first portion 121 has a relatively high melting point, and the second electrode terminal 2012 typically also has a relatively high melting point. This facilitates welding and fixing the second region 1212 to the second electrode terminal 2012, thereby improving the reliability of the connection between the second region 1212 and the second electrode terminal 2012. The second portion 122 is provided between the first region 1211 and the second region 1212 of the first portion 121. If the second portion 122 melts, the first region 1211 cannot be electrically connected to the second region 1212 through the second portion 122, and thus cannot be electrically connected to the first electrode terminal 2011. This allows the electrical connection between the first busbar 120 and the first electrode terminal 2011 to be promptly severed, thereby further severing the electrical connection between the at least two battery cells 20 connected to the first busbar 120.

[0143] It should be understood that the second electrode terminal 2012 of the present application is similar to the first electrode terminal 2011. The second electrode terminal 2012 can be any electrode terminal 201 of any one of the at least two battery cells 20 connected by the first busbar component 120, and the first busbar component 120 is electrically connected to the second electrode terminal 2012.

[0144] In an embodiment of the present application, the second region 1212 is provided corresponding to the second electrode terminal 2012, and the second region 1212 can be used to be connected and fixed to the second electrode terminal 2012, so that the first busbar component 120 can be electrically connected to the second electrode terminal 2012 through the second region 1212, for example, the second region 1212 can be welded and fixed to the second electrode terminal 2012.

[0145] Specifically, if Figures 10 to 14 As shown, along the thickness direction of the first busbar 120, the second region 1212 is located on the side of the second electrode terminal 2012 away from the battery cell 20, and the two can be fixedly connected by penetration welding. In this embodiment of the present application, the thickness direction of the first busbar 120 is taken as the height direction Z of the battery device 10 as an example. In some embodiments, to facilitate penetration welding, the thickness of at least a portion of the second region 1212 can be thinned so that the thickness of the thinned area of ​​the second region 1212 is less than the thickness of the second portion 122 and also less than the thickness of the first region 1211, thereby improving welding efficiency. In some embodiments, the second region 1212 can also be provided with a positioning hole, for example, a positioning hole can be provided in the center of the second region 1212 to facilitate alignment of the second region 1212 and the second electrode terminal 2012 for welding.

[0146] It should be understood that the shape of the second region 1212 in the embodiment of the present application can be set according to the shape of the second electrode terminal 2012. For example, the shape of the second region 1212 can be consistent with the shape of the second electrode terminal 2012. Alternatively, the shape of the second region 1212 can also be inconsistent with the shape of the second electrode terminal 2012, but the area of ​​the surface of the second region 1212 facing the second electrode terminal 2012 is usually set to be similar to the area of ​​the surface of the second electrode terminal 2012 facing the second region 1212, for example. Figures 10 to 14 As shown, the area of ​​the surface of the second region 1212 facing the second electrode terminal 2012 can be set to be slightly larger than the area of ​​the surface of the second electrode terminal 2012 facing the second region 1212, or the area of ​​the surface of the second region 1212 facing the second electrode terminal 2012 can be set to be at least larger than the area of ​​the welding region 2014 of the second electrode terminal 2012, so as to facilitate welding and fixing of the two and improve welding stability.

[0147] It should be understood that the surface of the first region 1211 facing the second portion 122 and the surface of the second portion 122 facing the first region 1211 can both be planar for ease of processing; similarly, the surface of the second portion 122 facing the second region 1212 and the surface of the second region 1212 facing the second portion 122 can also be planar for ease of processing. Alternatively, other structures can be provided between the aforementioned surfaces to enhance the structural stability of the first conduit member 120.

[0148] Figure 15 Another partial cross-sectional diagram of the first busbar component 120 and the second electrode terminal 2012 of the embodiment of the present application is shown, for example, Figure 15 Can be Figure 13 Another possible enlarged view of the cross-sectional view of region D is shown in FIG. Figure 15As shown, a first protrusion structure 1221 protruding toward the first area 1211 is provided on the side of the second part 122 facing the first area 1211, and the first protrusion structure 1221 is clamped in the middle of the first part 121 along the thickness direction of the first conduit component 120; and / or, a second protrusion structure 1222 protruding toward the second area 1212 is provided on the side of the second part 122 facing the second area 1212, and the second protrusion structure 1222 is clamped in the middle of the first part 121 along the thickness direction of the first conduit component 120. The first protruding structure 1221 can increase the contact area between the first region 1211 and the second part 122, and the second protruding structure 1222 can increase the contact area between the second region 1212 and the second part 122, thereby reducing the contact resistance. Moreover, the first protruding structure 1221 and the second protruding structure 1222 can also reduce the risk of movement between the first part 121 and the second part 122 along the thickness direction of the first convergence component 120, thereby improving structural stability.

[0149] Figure 16 FIG. 1 shows another possible structural diagram of the first confluence component 120 according to an embodiment of the present application. For example, Figure 16 The first busbar 120 shown may be Figure 2 The battery device 10 shown includes any one of the busbar components 12 . Figure 17 FIG. 1 shows a schematic diagram of the exploded structure of the first confluence component 120 according to an embodiment of the present application, for example, Figure 17 The first conduit component 120 shown can be as follows Figure 16 The first busbar component 120 is shown. Figure 18 FIG. 1 shows a schematic top view of the first confluence component 120 according to an embodiment of the present application, for example, Figure 18 The first conduit component 120 shown can be as follows Figure 16 and Figure 17 The first busbar component 120 is shown. Figure 19 The cross-sectional view of the first busbar component 120 and the electrode terminal 201 according to the embodiment of the present application is shown. For example, Figure 19 Shown along Figure 18 The cross-sectional view in the E-E' direction is shown. Figure 20 A partial cross-sectional schematic diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 20 You can Figure 19 An enlarged view of area F in the cross-sectional view is shown.

[0150] In some embodiments, the first portion 121 includes a third region 1213 and a fourth region 1214, the third region 1213 and the fourth region 1214 are respectively used to connect the electrode terminals 201 of different battery cells 20 in at least two battery cells 20, and the second portion 122 is located between the third region 1213 and the fourth region 1214, and the third region 1213 is used to be electrically connected to the fourth region 1214 through the second portion 122. Figures 16 to 20 As shown, the third portion 123 includes a first connection area 1231 and a second connection area 1232, and the first connection area 1231 and the second connection area 1232 are respectively used to connect the electrode terminals 201 of different battery cells 20 in at least two battery cells 20. The fuse part 125 of the embodiment of the present application can be as follows Figure 16 and Figure 18 Specifically, the first connection region 1231 is used to connect to the third region 1213. For example, the first connection region 1231 and the third region 1213 are generally integrally formed. The third region 1213 may be a portion of the first converging component 120 on a side adjacent to the second portion 122. Similarly, the second connection region 1232 is used to connect to the fourth region 1214. For example, the second connection region 1232 and the fourth region 1214 are generally integrally formed. The fourth region 1214 may be a portion of the first converging component 120 on the other side adjacent to the second portion 122.

[0151] The first busbar 120 connects to the electrode terminals 201 of different battery cells 20 through the third region 1213 and the fourth region 1214, respectively. This creates a relatively continuous flow path between the first busbar 120 and each electrode terminal 201, reducing the impact of the second portion 122 on the flow capacity. Specifically, the second portion 122 improves the flow capacity of the first busbar 120 under normal operating conditions. The flow capacity of the second portion 122, and thus the flow capacity of the first busbar 120, can also be adjusted by adjusting the thickness and other dimensions of the second portion 122. In high-temperature environments such as thermal runaway or external short circuits, the second portion 122 melts, rapidly causing the first busbar 120 to fuse, thereby promptly disconnecting the electrical connection between at least two battery cells 20.

[0152] In some embodiments, as Figures 16 to 20As shown, along the thickness direction of the first busbar component 120, the first connection region 1231 and the second connection region 1232 are respectively located on the side of the corresponding electrode terminal 201 away from the battery cell 20, and are fixedly connected to the corresponding electrode terminal 201 by penetration welding. In this embodiment of the present application, the thickness direction of the first busbar component 120 is taken as the height direction Z of the battery device 10. In some embodiments, to facilitate penetration welding, the thickness of at least a portion of the first connection region 1231 and the thickness of at least a portion of the second connection region 1232 can be reduced, so that the thickness of the thinned areas of the first connection region 1231 and the second connection region 1232 is less than the thickness of other areas, and can also be less than the thickness of the second portion 122, to improve welding efficiency. In some embodiments, the first connection area 1231 and the second connection area 1232 may also be provided with positioning holes, respectively. For example, positioning holes may be provided at the center positions of the first connection area 1231 and the second connection area 1232, respectively, so as to align the first connection area 1231 and the corresponding electrode terminal 201 and perform welding, and align the second connection area 1232 and the corresponding electrode terminal 201 and perform welding.

[0153] It should be understood that the shape of the second portion 122 located between the third region 1213 and the fourth region 1214 can be configured according to actual applications. For example, along the width direction of the first current-collecting component 120, the second portion 122 can be in an elongated strip shape to facilitate processing. In this embodiment of the present application, the width direction of the first current-collecting component 120 is taken as the width direction Y of the battery device 10, and the third region 1213 and the fourth region 1214 are distributed along the length direction of the first current-collecting component 120.

[0154] It should be understood that the surface of the second portion 122 facing the third region 1213 and the surface facing the fourth region 1214 can both be flat to facilitate processing. Alternatively, the surface of the second portion 122 facing the third region 1213 and / or the surface facing the fourth region 1214 can also be provided with other structures to improve the structural stability of the first conduit component 120.

[0155] Figure 21 Another partial cross-sectional schematic diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 21 Can be Figure 19 Another possible enlarged view of the cross-sectional view of region F is shown. In some embodiments, as Figure 21As shown, a third protrusion structure 1223 protruding toward the third area 1213 is provided on the side of the second part 122 facing the third area 1213; along the thickness direction of the first conduit component 120, the third protrusion structure 1223 is clamped in the middle of the first part 121; and / or, a fourth protrusion structure 1224 protruding toward the fourth area 1214 is provided on the side of the second part 122 facing the fourth area 1214; along the thickness direction of the first conduit component 120, the fourth protrusion structure 1224 is clamped in the middle of the first part 121. The third protrusion structure 1223 can increase the contact area between the third region 1213 and the second part 122, and the fourth protrusion structure 1224 can increase the contact area between the fourth region 1214 and the second part 122, thereby reducing the contact resistance. In addition, the third protrusion structure 1223 and the fourth protrusion structure 1224 can also reduce the risk of movement between the first part 121 and the second part 122 along the thickness direction of the first convergence component 120, thereby improving structural stability.

[0156] In the above embodiments, when the second portion 122 melts, the fuse 125 melts, thereby disconnecting the electrical connection between at least two battery cells 20. To further improve the current-carrying capacity of the first current-collecting member 120, it is also possible to configure the fuse 125 to melt when both the second portion 122 and the first portion 121 melt, thereby disconnecting the electrical connection between at least two battery cells 20.

[0157] In some embodiments, the fuse 125 is configured to maintain the electrical connection between at least two battery cells 20 when only the second portion 122 melts, and to disconnect the electrical connection between at least two battery cells 20 when both the first portion 121 and the second portion 122 melt. When the battery cells 20 are in normal use, both the first portion 121 and the second portion 122 can be used to achieve electrical connection between at least two battery cells 20, thereby improving the current-carrying capacity of the first busbar 120 to meet design requirements. When the temperature of the battery cell 20 rises, the melting point T2 of the second part 122 is smaller and it can melt faster. After the second part 122 melts, if the first part 121 has not melted yet, the fuse part 125 can still maintain the electrical connection of at least two battery cells 20 through the first part 121, but the flow area of ​​the fuse part 125 of the first busbar component 120 is reduced, resulting in a decrease in the flow capacity, and the temperature of the first part 121 increases, thereby accelerating the melting of the first part 121; thereafter, when the first part 121 also melts, the fuse part 125 melts, which can promptly disconnect the electrical connection between the at least two battery cells 20 connected to the first busbar component 120, and more quickly reduce the risk of continued occurrence of severe short-circuit behavior under thermal runaway conditions, or cut off the external short-circuit loop, thereby improving the reliability of the battery device 10.

[0158] The specific structure of the second portion 122 of the embodiment of the present application can be set according to actual application, so that the electrical connection between the at least two battery cells 20 connected to the first busbar component 120 can be disconnected only when the second portion 122 and the first portion 121 are melted. Figure 22 FIG. 1 shows another possible structural diagram of the first confluence component 120 according to an embodiment of the present application. For example, Figure 22 The first busbar 120 shown may be Figure 2 The battery device 10 shown includes any one of the busbar components 12 . Figure 23 FIG. 1 shows a schematic diagram of the exploded structure of the first confluence component 120 according to an embodiment of the present application, for example, Figure 23 The first conduit component 120 shown can be as follows Figure 22 The first busbar component 120 is shown. Figure 24 FIG. 1 shows a schematic top view of the first confluence component 120 according to an embodiment of the present application, for example, Figure 24 The first conduit component 120 shown can be as follows Figure 22 and Figure 23 The first busbar component 120 is shown. Figure 25 The cross-sectional view of the first busbar component 120 and the electrode terminal 201 according to the embodiment of the present application is shown. For example, Figure 25 Shown along Figure 24 Schematic cross-sectional view along the G-G' direction is shown. Figure 26 A partial cross-sectional schematic diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 26 You can Figure 25 An enlarged view of area H in the cross-sectional view is shown.

[0159] In some embodiments, the first busbar 120 includes a first connection region 1231 and a second connection region 1232, the first connection region 1231 and the second connection region 1232 being respectively used to connect the electrode terminals 201 of different battery cells 20 in at least two battery cells 20; along the length direction of the first busbar 120, the fuse 125 is located between the first connection region 1231 and the second connection region 1232, and the first connection region 1231 is used to be electrically connected to the second connection region 1232 through the fuse 125. Figures 22 to 26As shown, the first convergence component 120 is respectively connected to the electrode terminals 201 of different battery cells 20 through the first connection area 1231 and the second connection area 1232, and the first part 121 and the second part 122 are both located between the first connection area 1231 and the second connection area 1232, so that the first convergence component 120 has a relatively continuous flow path, reducing the influence of the setting of the second part 122 on the flow capacity, that is, the second part 122 can improve the flow capacity of the first convergence component 120 under normal operating conditions, and can also adjust the flow capacity of the second part 122 by adjusting the thickness, length and other dimensions of the second part 122, thereby adjusting the flow capacity of the first convergence component 120. In a high-temperature environment such as thermal runaway or external short circuit, the second part 122 will melt quickly, and the cross-sectional area of ​​the fuse part 125 perpendicular to the length direction X will decrease, that is, the flow area of ​​the fuse part 125 will decrease, so as to quickly reduce the flow capacity of the first confluence component 120, so that the temperature of the remaining first part 121 of the fuse part 125 increases, and the melting of the first part 121 is accelerated, so that the first confluence component 120 can be quickly melted in the first part 121, so that the fuse part 125 is melted, and the electrical connection between at least two battery cells 20 is disconnected in time.

[0160] In some embodiments, the first conduit component 120 includes a first connection area 1231 and a second connection area 1232 , for example, Figures 22 to 26 As shown, the third portion 123 includes a first connection region 1231 and a second connection region 1232. Along the thickness direction of the first current collecting component 120, the first connection region 1231 and the second connection region 1232 are respectively located on the side of the corresponding electrode terminal 201 away from the battery cell 20, and are fixedly connected to the corresponding electrode terminal 201 by penetration welding. In this embodiment of the present application, the thickness direction of the first current collecting component 120 is taken as the height direction Z of the battery device 10. In some embodiments, to facilitate penetration welding, the thickness of at least part of the first connection region 1231 and the second connection region 1232 can be thinned, so that the thickness of the thinned area of ​​the first connection region 1231 and the second connection region 1232 is less than the thickness of other areas, and can also be less than the thickness of the second portion 122, to improve welding efficiency. In some embodiments, the first connection area 1231 and the second connection area 1232 may also be provided with positioning holes, respectively. For example, positioning holes may be provided at the center of the first connection area 1231 and the second connection area 1232, respectively, so as to align the first connection area 1231 and the corresponding electrode terminal 201 and perform welding, and align the second connection area 1232 and the corresponding electrode terminal 201 and perform welding.

[0161] It should be understood that the specific structures of the first portion 121 and the second portion 122 of the embodiment of the present application can be set according to actual applications.

[0162] In some embodiments, the first portion 121 includes a first fusible link 1217 extending along the length of the first busbar 120, the first fusible link 1217 connecting the first connection region 1231 and the second connection region 1232. The second portion 122 includes a second fusible link 1227 extending along the length of the first busbar 120, the second fusible link 1227 connecting the first connection region 1231 and the second connection region 1232. Because both the first fusible link 1217 and the second fusible link 1227 can connect the first connection region 1231 and the second connection region 1232, the current flow capacity of the first busbar 120 can be improved under normal operating conditions. In a high-temperature environment such as thermal runaway or external short circuit, the second fusible link 1227 will melt first, and the flow area of ​​the fuse 125 will be reduced to the flow area of ​​the first fusible link 1217, so as to quickly reduce the flow capacity of the first busbar component 120. When the current remains unchanged, the heat generated by the remaining first fusible link 1217 of the fuse 125 will increase, and the temperature will further increase. The first fusible link 1217 will then melt, thereby causing the fuse 125 to melt as a whole, thereby promptly disconnecting the electrical connection between at least two battery cells 20.

[0163] It should be understood that the number, size, and relative position of the first fusible link 1217 and the second fusible link 1227 in the embodiment of the present application can be set according to actual applications.

[0164] For example, the first portion 121 includes a plurality of first fusible links 1217, and / or the second portion 122 includes a plurality of second fusible links 1227. Providing a plurality of first fusible links 1217 can reduce the size and strength of each first fusible link 1217, thereby accelerating the blowing of the first fusible link 1217. Similarly, providing a plurality of second fusible links 1227 can also reduce the size and strength of each second fusible link 1227, thereby accelerating the blowing of the second fusible link 1227.

[0165] It should be understood that the shapes of the multiple first fusible links 1217 can be the same or different; similarly, the sizes of the multiple first fusible links 1217 can be the same or different. For example, the multiple first fusible links 1217 can be configured to have the same shape and the same size to facilitate processing. Similarly, the shapes of the multiple second fusible links 1227 can be the same or different; the sizes of the multiple second fusible links 1227 can be the same or different. For example, the multiple second fusible links 1227 can be configured to have the same shape and the same size to facilitate processing. In addition, the shape of the multiple first fusible links 1217 can be the same as the shape of the multiple second fusible links 1227 to facilitate processing and assembly.

[0166] In some embodiments, each first fusible link 1217 is connected to at least one second fusible link 1227; and each second fusible link 1227 is connected to at least one first fusible link 1217. The interconnection between the first fusible link 1217 and the second fusible link 1227 can improve the current carrying capacity of the first busbar 120 when the battery cells 20 are operating normally. It can also increase the heat transfer speed in high-temperature environments such as thermal runaway or external short circuit, thereby accelerating the melting of the fuse 125.

[0167] It should be understood that in the embodiment of the present application, when multiple first fusible links 1217 and / or multiple second fusible links 1227 are provided, the first fusible links 1217 and the second fusible links 1227 can be arranged along the width direction of the first convergence component 120, or they can also be arranged along the thickness direction of the first convergence component 120.

[0168] In some embodiments, as Figures 22 to 27 As shown, the first portion 121 includes a plurality of first fusible links 1217, and the second portion 122 includes a plurality of second fusible links 1227. The plurality of first fusible links 1217 and the plurality of second fusible links 1227 are arranged alternately along the width of the first busbar 120. The plurality of first fusible links 1217 in the first portion 121 are relatively evenly distributed, which can reduce the risk of large temperature differences between different areas of the first portion 121 and improve the reliability of the first busbar 120.

[0169] In some embodiments, the shapes of the plurality of first fusible links 1217 and the plurality of second fusible links 1227 can be the same or different. For example, the shapes of the plurality of first fusible links 1217 and the plurality of second fusible links 1227 can both be long strips and extend along the length direction of the first busbar 120 to facilitate processing. In this embodiment of the present application, the length direction of the first busbar 120 is taken as the length direction X of the battery device 10.

[0170] It should be understood that the contact surface between the first fusible link 1217 and the second fusible link 1227 may be flat to facilitate processing. Alternatively, other structures may be provided between the contact surfaces between the first fusible link 1217 and the second fusible link 1227 to improve the structural stability of the first busbar 120.

[0171] Figure 27 Another partial cross-sectional schematic diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 27 Can be Figure 25 Another possible enlarged view of the cross-sectional view of region H is shown. In some embodiments, as Figure 27 As shown, a fifth protrusion structure 1225 protruding toward the first connection area 1231 is provided on the side of the second fusible link 1227 facing the first connection area 1231; along the thickness direction of the first conduit component 120, the fifth protrusion structure 1225 is clamped in the middle of the first part 121; and / or, a sixth protrusion structure 1226 protruding toward the second connection area 1232 is provided on the side of the second fusible link 1227 facing the second connection area 1232; along the thickness direction of the first conduit component 120, the sixth protrusion structure 1226 is clamped in the middle of the first part 121. The fifth protrusion structure 1225 can increase the contact area between the first connection area 1231 and the second fusible connection part 1227, and the sixth protrusion structure 1226 can increase the contact area between the second connection area 1232 and the second fusible connection part 1227, thereby reducing the contact resistance. In addition, the fifth protrusion structure 1225 and the sixth protrusion structure 1226 can also reduce the risk of movement between the first part 121 and the second fusible connection part 1227 along the thickness direction of the first convergence component 120, thereby improving structural stability.

[0172] In some embodiments, the second portion 122 includes a plurality of second fusible links 1227, one or more of the plurality of second fusible links 1227 being provided with a fifth protrusion structure 1225. Similarly, one or more of the plurality of second fusible links 1227 being provided with a sixth protrusion structure 1226. That is, the number of second fusible links 1227 provided with the fifth protrusion structure 1225 can be set according to actual applications, and the number of second fusible links 1227 provided with the sixth protrusion structure 1226 can be set according to actual applications. Moreover, the number of second fusible links 1227 provided with the fifth protrusion structure 1225 and the number of second fusible links 1227 provided with the sixth protrusion structure 1226 can be the same or different. The embodiments of the present application are not limited to this.

[0173] Figure 28 FIG. 1 shows another possible structural diagram of the first confluence component 120 according to an embodiment of the present application. For example, Figure 28 The first busbar 120 shown may be Figure 2 The battery device 10 shown includes any one of the busbar components 12 . Figure 29 FIG. 1 shows a schematic diagram of the exploded structure of the first confluence component 120 according to an embodiment of the present application, for example, Figure 29 The first conduit component 120 shown can be as follows Figure 28 The first busbar component 120 is shown. Figure 30 FIG. 1 shows a schematic top view of the first confluence component 120 according to an embodiment of the present application, for example, Figure 30 The first conduit component 120 shown can be as follows Figure 28 and Figure 29 The first busbar component 120 is shown. Figure 31 The cross-sectional view of the first busbar component 120 and the electrode terminal 201 according to the embodiment of the present application is shown. For example, Figure 31 Shown along Figure 30 The cross-sectional diagram along the II' direction is shown.

[0174] In some embodiments, as Figures 28 to 31As shown, the second part 122 includes two second fusible links 1227. Along the thickness direction of the first busbar component 120, the first fusible link 1217 is clamped between the two second fusible links 1227. The structure is simple and easy to implement. The thickness of the first fusible link 1217 located in the middle area is thinner. When the two second fusible links 1227 melt first, the flow area of ​​the fuse 125 is first reduced to the flow area of ​​the first fusible link 1217. When the current remains unchanged, the heat generated by the remaining first fusible link 1217 of the fuse 125 increases, and the temperature further rises, and then the first fusible link 1217 is subsequently melted, and then the fuse 125 is melted as a whole, so as to timely disconnect the electrical connection of at least two battery cells 20.

[0175] It should be understood that Figures 28 to 31 As shown, the two second fusible links 1227 and the first fusible link 1217 may have the same shape and size to facilitate processing and assembly.

[0176] Figure 32 Another exploded structural diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 32 The first conduit component 120 shown can be as follows Figure 28 Another possible structure of the first busbar component 120 is shown; Figure 30 You can also Figure 32 A schematic top view of the first busbar component 120 is shown; Figure 31 You can also Figure 32 FIG. 1 is a schematic cross-sectional view of the first busbar component 120 . Figure 33 Another cross-sectional schematic diagram of the first confluence component 120 according to an embodiment of the present application is shown, for example, Figure 33 Shown along Figure 30 Schematic cross-sectional view along the J-J' direction is shown.

[0177] In some embodiments, as Figures 30 to 33 As shown, the first fusible link 1217 is provided with a through hole 1218, and the second portion 122 further includes a third fusible link 1228. The third fusible link 1228 is accommodated in the through hole 1218 and connects the two second fusible links 1227. The third fusible link 1228 can improve the connection stability between the first portion 121 and the second portion 122, thereby improving the structural stability of the first busbar 120.

[0178] It should be understood that the number, location, and size of the through-holes 1218 of the first fusible link 1217 in the embodiment of the present application can be customized based on actual applications. For example, the first fusible link 1217 includes a plurality of through-holes 1218 arranged along the width of the first busbar 120, and the second portion 122 includes a plurality of third fusible links 1228 arranged along the width of the first busbar 120. The plurality of through-holes 1218 correspond one-to-one with the plurality of third fusible links 1228. This improves the structural stability of the first busbar 120 while ensuring that the current flow capacity of the first busbar 120 meets design requirements. In this embodiment of the present application, the width of the first busbar 120 is assumed to be the width direction Y of the battery device 10, and the first connection region 1231 and the second connection region 1232 of the first busbar 120 are arranged along the length of the first busbar 120.

[0179] It should be understood that the first busbar component 120 of the embodiment of the present application is used to electrically connect at least two battery cells 20 , for example, it can be used to connect at least two battery cells 20 in series and / or in parallel.

[0180] Figure 34 A partial structural diagram of a battery device 10 according to an embodiment of the present application is shown. Figure 34 It can be used to illustrate the connection relationship between any multiple battery cells 20 in the battery device 10 of the embodiment of the present application. Figure 34 As shown, at least two battery cells 20 include a first battery cell 21 and a second battery cell 22. A first busbar 120 is used to connect the first battery cell 21 and the second battery cell 22 in series. A fuse 125 is provided in the overcurrent path between the first battery cell 21 and the second battery cell 22 to promptly disconnect the series connection of the first battery cell 21 and the second battery cell 22. For the series connection, the electrode terminal 201 of the first battery cell 21 fixedly connected to the first busbar 120 and the electrode terminal 201 of the second battery cell 22 fixedly connected to the first busbar 120 have opposite polarity.

[0181] It should be understood that Figure 34 Mainly such as Figures 16 to 21 Taking the illustrated embodiment as an example, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the first battery cell 21 and the second battery cell 22 .

[0182] In some embodiments, for Figures 4 to 9In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the second battery cell 22 that is connected and fixed to the first busbar component 120 can also be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the second battery cell 22.

[0183] In some embodiments, for Figures 10 to 15 In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the second battery cell 22 that is connected and fixed to the first busbar component 120 can also be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the second battery cell 22.

[0184] In some embodiments, for Figures 22 to 33 In the illustrated embodiment, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the first battery cell 21 and the second battery cell 22 .

[0185] In some embodiments, the plurality of busbars 12 in the battery device 10 may include one or more Figure 34 The busbar components 12 shown are used to connect the battery cells 20 in series. The one or more busbar components 12 may include at least one Figure 34 The first busbar 120 shown, for example, may be configured as a first busbar 120 having a fuse 125 in accordance with an embodiment of the present application, to improve the reliability of the battery device 10. However, the present application is not limited thereto. The first busbar 120 may be provided with one or more fuses 125 to meet the requirements for fuse protection between different battery cells 20.

[0186] Figure 35 Another partial structural diagram of the battery device 10 according to an embodiment of the present application is shown. Figure 35 It can be used to illustrate another possible connection relationship between any plurality of battery cells 20 in the battery device 10 of the embodiment of the present application. Figure 35As shown, when the first busbar component 120 is used to connect the first battery cell 21 and the second battery cell 22 in series, at least two battery cells 20 also include a third battery cell 23 and a fourth battery cell 24. The first busbar component 120 is also used to connect the third battery cell 23 and the first battery cell 21 in parallel, and to connect the second battery cell 22 and the fourth battery cell 24 in parallel. By realizing series and parallel connection through the first busbar component 120, the connection flexibility between the battery cells 20 can be improved, so that the battery device 10 meets different design requirements.

[0187] In some embodiments, as Figure 35 As shown, Figure 34 Similarly, the fuse 125 may be provided on the current path between the first battery cell 21 and the second battery cell 22 connected in series, which will not be described in detail here for the sake of brevity.

[0188] In some embodiments, the plurality of busbars 12 in the battery device 10 may include one or more Figure 35 The busbar components 12 shown for parallel connection of battery cells 20 may include at least one of the one or more busbar components 12. Figure 35 The first busbar component 120 shown, for example, the one or more busbar components 12 can be set as the first busbar component 120 with a fuse part 125 in the embodiment of the present application to improve the reliability of the battery device 10, but the embodiment of the present application is not limited thereto.

[0189] Figure 36 Another partial structural diagram of the battery device 10 according to an embodiment of the present application is shown. Figure 36 It can be used to illustrate another possible connection relationship between any plurality of battery cells 20 in the battery device 10 of the embodiment of the present application. Figure 36 As shown, compared Figure 35 In the case where the fuse part 125 is arranged on the overcurrent path between the first battery cell 21 and the second battery cell 22, the fuse part 125 can also be arranged on the overcurrent path between the third battery cell 23 and the first battery cell 21, thereby improving the reliability between the third battery cell 23 and the first battery cell 21; and / or, the fuse part 125 can also be arranged on the overcurrent path between the second battery cell 22 and the fourth battery cell 24, thereby improving the reliability between the second battery cell 22 and the fourth battery cell 24.

[0190] For example, taking the example of the fuse part 125 being arranged on the overcurrent path between the third battery cell 23 and the first battery cell 21, the relevant description is also applicable to the case where the fuse part 125 is arranged on the overcurrent path between the second battery cell 22 and the fourth battery cell 24, and will not be repeated here. Figure 36 Mainly such as Figures 16 to 21 Taking the illustrated embodiment as an example, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the third battery cell 23 and the first battery cell 21 .

[0191] In some embodiments, for Figures 4 to 9 In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the third battery cell 23 that is connected and fixed to the first busbar component 120 can also be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the third battery cell 23.

[0192] In some embodiments, for Figures 10 to 15 In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the third battery cell 23 that is connected and fixed to the first busbar component 120 can also be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the third battery cell 23.

[0193] In some embodiments, for Figures 22 to 33 In the illustrated embodiment, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the first battery cell 21 and the third battery cell 23 .

[0194] In some embodiments, the plurality of busbars 12 in the battery device 10 may include one or more Figure 36 The embodiment shown in FIG. 1 shows a busbar component 12 for connecting parallel battery cells 20. The one or more busbar components 12 may include at least one Figure 36 The first busbar component 120 shown, for example, the one or more busbar components 12 can be set as the first busbar component 120 with a fuse part 125 in the embodiment of the present application to improve the reliability of the battery device 10, but the embodiment of the present application is not limited thereto.

[0195] Figure 37 Another partial structural diagram of the battery device 10 according to an embodiment of the present application is shown. Figure 37 It can be used to illustrate another possible connection relationship between any plurality of battery cells 20 in the battery device 10 of the embodiment of the present application. Figure 37As shown, when the first current collecting component 120 is used for parallel connection, the fuse 125 may not be provided on the current flow path between the first battery cell 21 and the second battery cell 22 connected in series.

[0196] Specifically, if Figure 37 As shown, at least two battery cells 20 include a first battery cell 21, a second battery cell 22, a third battery cell 23, and a fourth battery cell 24; a first busbar 120 is used to connect the first battery cell 21 and the second battery cell 22 in series, connect the third battery cell 23 and the first battery cell 21 in parallel, and connect the second battery cell 22 and the fourth battery cell 24 in parallel. A fuse 125 is provided on the overflow path between the third battery cell 23 and the first battery cell 21; and / or, the fuse 125 is provided on the overflow path between the second battery cell 22 and the fourth battery cell 24, thereby improving the reliability between the third battery cell 23 and the first battery cell 21, and / or improving the reliability between the second battery cell 22 and the fourth battery cell 24.

[0197] For example, taking the case where the fuse part 125 is arranged on the overcurrent path between the third battery cell 23 and the first battery cell 21 as an example, the relevant description is also applicable to the case where the fuse part 125 is arranged on the overcurrent path between the second battery cell 22 and the fourth battery cell 24, and will not be repeated here. Figure 37 Mainly such as Figures 16 to 21 Taking the illustrated embodiment as an example, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the third battery cell 23 and the first battery cell 21 .

[0198] In some embodiments, for Figures 4 to 9 In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the third battery cell 23 that is connected and fixed to the first busbar component 120 can also be the first electrode terminal 2011, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the third battery cell 23.

[0199] In some embodiments, for Figures 10 to 15In the embodiment shown, the electrode terminal 201 of the first battery cell 21 that is connected and fixed to the first busbar component 120 can be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the first battery cell 21; and / or, the electrode terminal 201 of the third battery cell 23 that is connected and fixed to the first busbar component 120 can also be the second electrode terminal 2012, that is, the fuse part 125 can be set corresponding to the electrode terminal 201 of the third battery cell 23.

[0200] In some embodiments, for Figures 22 to 33 In the illustrated embodiment, the fuse portion 125 may be provided in a region of the first busbar member 120 corresponding to between the first battery cell 21 and the third battery cell 23 .

[0201] In some embodiments, the plurality of busbars 12 in the battery device 10 may include one or more Figure 37 The embodiment shown in FIG. 1 shows a busbar component 12 for connecting parallel battery cells 20. The one or more busbar components 12 may include at least one Figure 37 The first busbar component 120 shown, for example, the one or more busbar components 12 can be set as the first busbar component 120 with a fuse part 125 in the embodiment of the present application to improve the reliability of the battery device 10, but the embodiment of the present application is not limited thereto.

[0202] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery device 10 described in any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0203] The power-consuming device may be any of the aforementioned devices or systems using the battery device 10 .

[0204] According to some embodiments of the present application, see Figures 4 to 37The present application provides a battery device 10 comprising: a plurality of battery cells 20 and a plurality of busbars 12. The plurality of busbars 12 are used to electrically connect the plurality of battery cells 20. The plurality of busbars 12 include a first busbar 120 electrically connected to the electrode terminals 201 of at least two of the plurality of battery cells 20. The first busbar 120 includes a fuse 125 located in the current path between the two electrode terminals 201 connected to the first busbar 120. The fuse 125 includes a first portion 121 and a second portion 122 connected thereto. The melting points T1 and T2 of the first portion 121 and the second portion 122 satisfy the following conditions: 150°C ≤ T2 < T1 ≤ 700°C. The fuse 125 is configured such that when the second portion 122 melts, the current flow area of ​​the fuse 125 decreases. The conductivity of the first portion 121 is greater than that of the second portion 122. The volume of the first portion 121 is greater than the volume of the second portion 122 .

[0205] The fuse 125 is configured to disconnect the electrical connection between at least two battery cells 20 when the second portion 122 melts. The at least two battery cells 20 include a first electrode terminal 2011, with the second portion 122 disposed corresponding to the first electrode terminal 2011. The first portion 121 surrounds the second portion 122, and the first portion 121 is electrically connected to the first electrode terminal 2011 through the second portion 122. Alternatively, the at least two battery cells 20 include a second electrode terminal 2012, with the first portion 121 comprising a first region 1211 and a second region 1212. The second region 1212 is disposed corresponding to the second electrode terminal 2012, with the second portion 122 surrounding the second region 1212. The first region 1211 surrounds the second portion 122, and the second region 1212 is electrically connected to the first region 1211 through the second portion 122. Alternatively, the first portion 121 includes a third region 1213 and a fourth region 1214, and the third region 1213 and the fourth region 1214 are respectively used to connect the electrode terminals 201 of different battery cells 20 in at least two battery cells 20, and the second portion 122 is located between the third region 1213 and the fourth region 1214, and the third region 1213 is used to be electrically connected to the fourth region 1214 through the second portion 122.

[0206] The fuse 125 is configured to maintain the electrical connection between at least two battery cells 20 when only the second portion 122 melts, and to disconnect the electrical connection between at least two battery cells 20 when both the first portion 121 and the second portion 122 melt. The first busbar 120 includes a first connection region 1231 and a second connection region 1232, each of which is used to connect the electrode terminals 201 of different battery cells 20. Along the length of the first busbar 120, the fuse 125 is located between the first connection region 1231 and the second connection region 1232. The first connection region 1231 is electrically connected to the second connection region 1232 via the fuse 125.

[0207] The first portion 121 includes a first fusible link 1217 extending along the length of the first busbar 120. The first fusible link 1217 connects a first connection region 1231 and a second connection region 1232. The second portion 122 includes a second fusible link 1227 extending along the length of the first busbar 120. The second fusible link 1227 connects the first connection region 1231 and the second connection region 1232. The first portion 121 includes a plurality of first fusible links 1217, and / or the second portion 122 includes a plurality of second fusible links 1227. Each first fusible link 1217 connects to at least one second fusible link 1227, and each second fusible link 1227 connects to at least one first fusible link 1217.

[0208] The first portion 121 includes a plurality of first fusible links 1217, and the second portion 122 includes a plurality of second fusible links 1227. The plurality of first fusible links 1217 and the plurality of second fusible links 1227 are arranged alternately along the width of the first busbar 120. Alternatively, the second portion 122 includes two second fusible links 1227, with the first fusible link 1217 sandwiched between the two second fusible links 1227 along the thickness of the first busbar 120. The first fusible link 1217 is provided with a through hole 1218, and the second portion 122 further includes a third fusible link 1228, which is received in the through hole 1218 and connects the two second fusible links 1227.

[0209] The at least two battery cells 20 include a first battery cell 21 and a second battery cell 22. The first busbar 120 is used to connect the first battery cell 21 and the second battery cell 22 in series, and a fuse 125 is provided in the current path between the first battery cell 21 and the second battery cell 22. The at least two battery cells 20 also include a third battery cell 23 and a fourth battery cell 24. The first busbar 120 is further used to connect the third battery cell 23 and the first battery cell 21 in parallel, and to connect the second battery cell 22 and the fourth battery cell 24 in parallel. The first busbar 120 is provided with a plurality of fuses 125, wherein the fuses 125 are also provided in the current path between the third battery cell 23 and the first battery cell 21; alternatively, the fuses 125 are also provided in the current path between the second battery cell 22 and the fourth battery cell 24.

[0210] At least two battery cells 20 include a first battery cell 21, a second battery cell 22, a third battery cell 23 and a fourth battery cell 24; the first busbar component 120 is used to connect the first battery cell 21 and the second battery cell 22 in series, the third battery cell 23 and the first battery cell 21 in parallel, and the second battery cell 22 and the fourth battery cell 24 in parallel, wherein the fuse 125 is arranged on the overcurrent path between the third battery cell 23 and the first battery cell 21; or, the fuse 125 is arranged on the overcurrent path between the second battery cell 22 and the fourth battery cell 24.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: a plurality of battery cells (20); A plurality of current collecting components (12) are used to electrically connect the plurality of battery cells (20), the plurality of current collecting components (12) comprising a first current collecting component (120), the first current collecting component (120) being electrically connected to the electrode terminals (201) of at least two battery cells (20) among the plurality of battery cells (20), the first current collecting component (120) comprising a fuse (125), the fuse (125) being located on a flow path between the two electrode terminals (201) connected to the first current collecting component (120); the fuse (125) comprising a first portion (121) and a second portion (122) being connected, the melting point T1 of the first portion (121) and the melting point T2 of the second portion (122) satisfying the following conditions: 150°C≤T2<T1≤700°C, and the fuse (125) being configured such that when the second portion (122) melts, the flow area of ​​the fuse (125) becomes smaller.

2. The battery device according to claim 1, wherein: The electrical conductivity of the first portion (121) is greater than the electrical conductivity of the second portion (122).

3. The battery device according to claim 1 or 2, characterized in that The volume of the first portion (121) is greater than the volume of the second portion (122).

4. The battery device according to any one of claims 1 to 3, characterized in that The fuse part (125) is configured to disconnect the electrical connection between the at least two battery cells (20) when the second portion (122) melts.

5. The battery device according to claim 4, characterized in that The at least two battery cells (20) include a first electrode terminal (2011), the second portion (122) is arranged corresponding to the first electrode terminal (2011), the first portion (121) surrounds the second portion (122), and the first portion (121) is used to be electrically connected to the first electrode terminal (2011) through the second portion (122).

6. The battery device according to claim 5, characterized in that A first protruding structure (1221) protruding toward the first part (121) is provided on one side of the second part (122) facing the first part (121). Along the thickness direction of the first conduit component (120), the first protruding structure (1221) is clamped in the middle of the first portion (121).

7. The battery device according to claim 4, characterized in that The at least two battery cells (20) include a second electrode terminal (2012); the first portion (121) includes a first region (1211) and a second region (1212); the second region (1212) is arranged corresponding to the second electrode terminal (2012); the second portion (122) surrounds the second region (1212); and the first region (1211) surrounds the second portion (122); and the second region (1212) is electrically connected to the first region (1211) via the second portion (122).

8. The battery device according to claim 7, characterized in that A first protruding structure (1221) protruding toward the first area (1211) is provided on one side of the second portion (122) facing the first area (1211), and along the thickness direction of the first conduit component (120), the first protruding structure (1221) is clamped in the middle of the first portion (121); and / or, A second protruding structure (1222) protruding toward the second area (1212) is provided on one side of the second portion (122) facing the second area (1212), and along the thickness direction of the first conduit component (120), the second protruding structure (1222) is clamped in the middle of the first portion (121).

9. The battery device according to claim 4, characterized in that The first portion (121) includes a third region (1213) and a fourth region (1214), wherein the third region (1213) and the fourth region (1214) are respectively used to connect electrode terminals (201) of different battery cells (20) among the at least two battery cells (20), and the second portion (122) is located between the third region (1213) and the fourth region (1214), and the third region (1213) is used to be electrically connected to the fourth region (1214) through the second portion (122).

10. The battery device according to claim 9, characterized in that A third protruding structure (1223) protruding toward the third area (1213) is provided on a side of the second portion (122) facing the third area (1213); along the thickness direction of the first conduit component (120), the third protruding structure (1223) is clamped in the middle of the first portion (121); and / or, A fourth protruding structure (1224) protruding toward the fourth area (1214) is provided on one side of the second portion (122) facing the fourth area (1214); along the thickness direction of the first conduit component (120), the fourth protruding structure (1224) is clamped in the middle of the first portion (121).

11. The battery device according to any one of claims 1 to 3, characterized in that The fuse part (125) is configured to maintain the electrical connection of the at least two battery cells (20) when only the second part (122) melts, and to disconnect the electrical connection of the at least two battery cells (20) when both the first part (121) and the second part (122) melt.

12. The battery device according to claim 11, wherein: The first current collecting component (120) comprises a first connection area (1231) and a second connection area (1232), wherein the first connection area (1231) and the second connection area (1232) are respectively used to connect the electrode terminals (201) of different battery cells (20) among the at least two battery cells (20); along the length direction of the first current collecting component (120), the fuse portion (125) is located between the first connection area (1231) and the second connection area (1232), and the first connection area (1231) is used to be electrically connected to the second connection area (1232) through the fuse portion (125).

13. The battery device according to claim 12, characterized in that The first portion (121) includes a first fusible connection portion (1217) extending along the length direction of the first busbar component (120); the first fusible connection portion (1217) connects the first connection area (1231) and the second connection area (1232); the second portion (122) includes a second fusible connection portion (1227) extending along the length direction of the first busbar component (120), and the second fusible connection portion (1227) connects the first connection area (1231) and the second connection area (1232).

14. The battery device according to claim 13, wherein: The first portion (121) includes a plurality of the first fusible links (1217), and / or the second portion (122) includes a plurality of the second fusible links (1227).

15. The battery device according to claim 13, wherein: Each of the first fusible connection parts (1217) is connected to at least one of the second fusible connection parts (1227); each of the second fusible connection parts (1227) is connected to at least one of the first fusible connection parts (1217).

16. The battery device according to any one of claims 13 to 15, characterized in that The first portion (121) includes a plurality of first fusible links (1217), and the second portion (122) includes a plurality of second fusible links (1227); the plurality of first fusible links (1217) and the plurality of second fusible links (1227) are alternately arranged along the width direction of the first busbar component (120).

17. The battery device according to claim 16, characterized in that A fifth protruding structure (1225) protruding toward the first connection area (1231) is provided on one side of the second fusible link (1227) facing the first connection area (1231); along the thickness direction of the first conduit component (120), the fifth protruding structure (1225) is clamped in the middle of the first portion (121); and / or, A sixth protruding structure (1226) protruding toward the second connection area (1232) is provided on one side of the second fusible connection portion (1227) facing the second connection area (1232); along the thickness direction of the first conduit component (120), the sixth protruding structure (1226) is clamped in the middle of the first part (121).

18. The battery device according to any one of claims 13 to 15, characterized in that The second portion (122) includes two second fusible links (1227), and along the thickness direction of the first busbar component (120), the first fusible link (1217) is clamped between the two second fusible links (1227).

19. The battery device according to claim 18, wherein: The first fusible link (1217) is provided with a through hole (1218), and the second portion (122) further includes a third fusible link (1228), which is accommodated in the through hole (1218) and connects the two second fusible links (1227).

20. The battery device according to claim 19, wherein: The first fusible connection portion (1217) is provided with a plurality of through holes (1218) arranged along the width direction of the first busbar component (120), and the second portion (122) includes a plurality of third fusible connection portions (1228) arranged along the width direction of the first busbar component (120), and the plurality of through holes (1218) correspond one-to-one to the plurality of third fusible connection portions (1228).

21. The battery device according to any one of claims 1 to 3, characterized in that The at least two battery cells (20) include a first battery cell (21) and a second battery cell (22); the first current collecting component (120) is used to connect the first battery cell (21) and the second battery cell (22) in series; and the fuse (125) is provided on a current flow path between the first battery cell (21) and the second battery cell (22).

22. The battery device according to claim 21, characterized in that The at least two battery cells (20) further include a third battery cell (23) and a fourth battery cell (24); the first busbar component (120) is further used to connect the third battery cell (23) and the first battery cell (21) in parallel, and to connect the second battery cell (22) and the fourth battery cell (24) in parallel.

23. The battery device according to claim 22, characterized in that The first confluence component (120) is provided with a plurality of the fuse parts (125), wherein: The fuse (125) is further provided on the overcurrent path between the third battery cell (23) and the first battery cell (21); or, The fuse (125) is also provided on the overflow path between the second battery cell (22) and the fourth battery cell (24).

24. The battery device according to any one of claims 1 to 3, characterized in that The at least two battery cells (20) include a first battery cell (21), a second battery cell (22), a third battery cell (23) and a fourth battery cell (24); the first busbar component (120) is used to connect the first battery cell (21) and the second battery cell (22) in series, connect the third battery cell (23) and the first battery cell (21) in parallel, and connect the second battery cell (22) and the fourth battery cell (24) in parallel. Wherein, the fuse part (125) is provided on the overcurrent path between the third battery cell (23) and the first battery cell (21); or, The fuse (125) is provided on a flow path between the second battery cell (22) and the fourth battery cell (24).

25. The battery device according to any one of claims 1 to 3, characterized in that The first part (121) and the second part (122) are fixedly connected by at least one of the following methods: casting, welding, clamping, and hot or cold rolling.

26. The battery device according to any one of claims 1 to 3, characterized in that The material of the first portion (121) comprises aluminum alloy; and / or, The material of the second portion (122) includes at least one of the following: bismuth, tin, lead, indium metal and alloys thereof.

27. An electrical device, characterized in that: The device comprises the battery device according to any one of claims 1 to 26, wherein the battery device is used to supply power to the electrical device.

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