Battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery device, a power utilization device and an energy storage device. The use performance of the battery device can be improved. The battery device comprises a plurality of battery monomers, a confluence part, a safety device, a sampling structure and a second insulation part, the safety device comprises a conductive part and a first insulation part, the conductive part comprises a first conductive part, a second conductive part and a fusing part, and the first conductive part and the second conductive part are arranged at an interval; the first conductive part is connected with the sampling line, the second conductive part is connected with the confluence part, the fusing part is connected with the first conductive part and the second conductive part, and at least part of the first insulating part is located between the first conductive part and the confluence part. At least part of the second insulating component is located on the side, away from the confluence component in the first direction, of the safety device, at least part of the surface of the second conductive component is covered by the second insulating component in the first direction, and at least part of the surface of the confluence component is covered by the second insulating component.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device, an electrical device, and an energy storage device. Background Technology

[0002] In the development of battery technology, battery devices are usually equipped with sampling structures that can collect voltage data of individual battery cells during use. If the sampling structure is damaged or its performance degrades due to insulation failure during use, it becomes difficult to accurately obtain the voltage data of the battery device, thus reducing the performance of the battery device.

[0003] Therefore, improving the performance of battery devices has become a pressing technical problem in this field. Utility Model Content

[0004] This application provides a battery device, an electrical device, and an energy storage device, which can improve the performance of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a plurality of battery cells; a busbar configured to electrically connect different battery cells; a fuse device stacked with the busbar in a first direction; a sampling structure including a sampling line electrically connected to the busbar via the fuse device; the fuse device including a conductive member and a first insulating member, the conductive member including a first conductive member, a second conductive member, and a fuse portion, the first conductive member and the second conductive member being spaced apart, the first conductive member being connected to the sampling line, the second conductive member being connected to the busbar, the fuse portion connecting the first conductive member and the second conductive member, at least a portion of the first insulating member being located between the first conductive member and the busbar; and a second insulating member, at least a portion of which is located on the side of the fuse device away from the busbar along the first direction, wherein at least a portion of the surface of the second conductive member is covered by the second insulating member along the first direction, and at least a portion of the surface of the busbar is covered by the second insulating member.

[0006] In this embodiment, the battery device is configured to include multiple battery cells, a busbar, a fuse, a sampling structure, and a second insulating component. The sampling line of the sampling structure is electrically connected to the busbar through the fuse. The fuse includes a conductive component and a first insulating component. The conductive component includes a first conductive component, a second conductive component, and a fuse. The first conductive component and the second conductive component are spaced apart. The first conductive component is connected to the sampling line, and the second conductive component is connected to the busbar. The fuse connects the first conductive component and the second conductive component. At least a portion of the first insulating component is located between the first conductive component and the busbar, and at least a portion of the second insulating component is located within the fuse. Along the first direction away from the busbar component, at least a portion of the surface of the second conductive component is covered by the second insulating component. This reduces the risk of oxidation in the connection area between the second conductive component and the busbar component, which could lead to a decrease in connection strength. This improves the connection strength between the fuse and the busbar component, balancing the connection strength between the fuse and the busbar component with the assembly performance of the battery device. Furthermore, by covering at least a portion of the surface of the busbar component with the second insulating component, the risk of short circuits caused by contact between the busbar component and other components is reduced, thereby improving the structural stability between the fuse and the busbar component and ultimately enhancing the performance of the battery device.

[0007] In some embodiments, the second insulating component includes a first through-hole extending along the first direction, at least a portion of the surface of the first conductive component is exposed through the first through-hole, and the sampling line is connected to the first conductive component through the first through-hole.

[0008] In this embodiment, the second insulating component is configured to include a first through hole extending along the first direction, at least a portion of the surface of the first conductive component is exposed through the first through hole, and the sampling line is connected to the first conductive component through the first through hole, so as to connect the sampling line of the sampling structure to the first conductive component, thereby improving the assembly performance and connection strength between the sampling line and the safety device, and thus improving the usability and assembly performance of the battery device.

[0009] In some embodiments, the first conductive component covers the first through-hole along the first direction.

[0010] In this embodiment of the application, by setting the first conductive component to cover the first through hole along the first direction, the risk of short circuit in the battery device caused by the exposed part of the first conductive component overlapping with other components through the first through hole is reduced, and the risk of the first conductive component falling off from the first through hole is also reduced, thereby improving the performance of the battery device.

[0011] In some embodiments, the entire surface of the second conductive component is covered by the second insulating component along the first direction.

[0012] In this embodiment of the application, by setting the entire surface of the second conductive component to be covered by the second insulating component along the first direction, the risk of oxidation in the connection area between the second conductive component and the busbar component, which leads to a decrease in connection strength, can be effectively reduced. This effectively improves the connection strength between the safety device and the busbar component, taking into account both the connection strength between the safety device and the busbar component and the assembly performance of the battery device. At the same time, it further improves the structural stability between the safety device and the busbar component, thereby improving the performance of the battery device.

[0013] In some embodiments, the second insulating component further includes a second through hole extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the second through hole and the orthographic projection of the second conductive component, and there is no overlapping area between the orthographic projection of the second through hole and the orthographic projection of the first through hole.

[0014] In this embodiment, by configuring the second insulating component to include a second through hole extending along the first direction, there is an overlapping area between the orthographic projection of the second through hole and the orthographic projection of the second conductive component on a projection plane perpendicular to the first direction, and there is no overlapping area between the orthographic projection of the second through hole and the orthographic projection of the first through hole. The busbar component and the second conductive component can be connected through the second through hole without going through the second insulating component, which facilitates the connection between the busbar component and the second conductive component, effectively reducing the assembly difficulty between the safety device and the busbar component, thereby improving the assembly performance and usability of the battery device.

[0015] In some embodiments, the second conductive component covers the second through-hole along the first direction.

[0016] In this embodiment of the application, by setting the second conductive component to cover the second through hole along the first direction, the risk of short circuit in the battery device caused by the exposed part of the second conductive component overlapping with other components through the second through hole is reduced, and the risk of the second conductive component falling off from the second through hole is also reduced, thereby improving the performance of the battery device.

[0017] In some embodiments, the first insulating member includes a third through hole extending along the first direction, and on a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the third through hole and the orthographic projection of the second through hole.

[0018] In this embodiment, the first insulating component is configured to include a third through hole extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the third through hole and the orthographic projection of the second through hole. During the connection between the busbar and the second conductive component, it is not necessary to go through the first insulating component and the second insulating component. This allows the busbar to be directly connected to the second conductive component through the second through hole and the third through hole, effectively reducing the assembly difficulty between the safety device and the busbar, while improving the connection strength between the busbar and the second conductive component, thereby improving the assembly performance and usability of the battery device.

[0019] In some embodiments, on a projection plane perpendicular to the first direction, the orthographic projection of the second through hole overlaps with the orthographic projection of the third through hole.

[0020] In this embodiment, on the projection plane perpendicular to the first direction, by setting the orthographic projection of the second through hole to overlap with the orthographic projection of the third through hole, during the connection between the busbar and the second conductive component, it is not necessary to go through the first insulating component and the second insulating component. This allows the busbar to be directly connected to the second conductive component through the second through hole and the third through hole, further reducing the assembly difficulty between the safety device and the busbar, and effectively improving the connection strength between the busbar and the second conductive component, thereby further improving the assembly performance and usability of the battery device.

[0021] In some embodiments, on a projection plane perpendicular to the first direction, the minimum dimension D1 between the second insulating member and the safety device satisfies: 2mm≤D1≤10mm.

[0022] In this embodiment, on the projection plane perpendicular to the first direction, by setting the minimum dimension D1 between the second insulating component and the fuse device to satisfy: 2mm≤D1≤10mm, when the fuse device is connected to the busbar component, it is convenient to assemble the second insulating component to the side of the fuse device away from the busbar component, effectively reducing the risk of oxidation in the connection area between the fuse device and the busbar component, taking into account the connection strength between the fuse device and the busbar component and the processing and manufacturing costs, thereby improving the performance and assembly performance of the battery device.

[0023] In some embodiments, on a projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device and the busbar component satisfies: 0.5mm ≤ D2 ≤ 2mm.

[0024] In this embodiment, on the projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device and the busbar is set to satisfy: 0.5mm≤D2≤2mm, so as to facilitate the connection of the sampling line to the first conductive component and reduce the risk of short circuit of the battery device caused by the overlap between the edge of the conductive component in the safety device and the edge of the busbar, thereby improving the performance of the battery device and the assembly performance.

[0025] In some embodiments, the busbar is connected to a first wall of the battery cell facing the busbar in the first direction, and the safety device is connected to a surface of the busbar away from the first wall in the first direction.

[0026] In this embodiment, by configuring the busbar component as a first wall connected to the battery cell along the first direction toward the busbar component, and configuring the safety device as a surface connected to the busbar component along the first direction away from the first wall, it is easier to assemble the safety device onto the busbar component. At the same time, it reduces the assembly difficulty between the sampling line of the sampling structure and the first conductive component, thereby improving the assembly performance and usability of the battery device.

[0027] In some embodiments, the area of ​​the busbar component near the safety device is configured as an arc-shaped structure.

[0028] In this embodiment, by setting the area of ​​the busbar near the safety device to an arc shape, the influence of the edge area of ​​the busbar on the sampling line is reduced during the process of connecting the sampling line of the sampling structure to the first conductive part of the safety device. For example, if the edge area of ​​the busbar is set to a right angle, the risk of damage to the sampling line is easily caused. At the same time, the influence of the edge of the busbar on the safety device during bending can be reduced, thereby improving the performance and manufacturing performance of the battery device.

[0029] In some embodiments, the conductive component, the bus component, and the sampling line are made of the same material.

[0030] In this embodiment, by setting the materials of the conductive component, the busbar component, and the sampling line to be the same, the sampling line of the sampling structure is welded to the first conductive component in the conductive component, and the second conductive component in the conductive component is welded to the busbar component. This improves the connection strength between the first conductive component and the sampling line, and improves the connection strength between the second conductive component and the busbar component, thereby improving the assembly performance of the battery device and reducing processing and manufacturing costs.

[0031] In some embodiments, the second conductive component is welded to the bus component.

[0032] In this embodiment of the application, by connecting the second conductive component with the busbar component, the connection strength between the second conductive component and the busbar component can be effectively improved, thereby improving the assembly performance and performance of the battery device.

[0033] In a second aspect, an electrical device is provided, including the battery device described in the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0034] In some implementations, the electrical device can be a vehicle, ship, or spacecraft.

[0035] Thirdly, an energy storage device is provided, including the battery device described in the first aspect, the battery device being used to store electrical energy for the energy storage device. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0038] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0039] Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application.

[0040] Figure 4 This is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0041] Figure 5 This is an exploded view of a battery device provided in another embodiment of this application.

[0042] Figure 6 This is a top view schematic diagram of a battery device provided in an embodiment of this application.

[0043] Figure 7 This is a top view of the safety device and the busbar component after they are assembled together according to an embodiment of this application.

[0044] Figure 8 This is a partially enlarged top view of a safety device and a busbar assembly provided in an embodiment of this application.

[0045] Figure 9 This is an exploded view of the safety device provided in one embodiment of this application.

[0046] Figure 10 This is an exploded view of the safety device provided in another embodiment of this application.

[0047] Figure 11 This is an exploded view of the safety device provided in another embodiment of this application.

[0048] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Casing; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Housing shell; 212-End cap; 222-Electrode tab; 222a-Positive electrode tab; 222b-Negative electrode tab; 213-Pressure relief mechanism; 214-Electrode terminal; 214a-First electrode terminal; 2 14b - Second electrode terminal; 215 - Support component; 216 - First wall; 23 - Adapter component; 50 - Receiving cavity; 60 - Busbar component; 70 - Safety device; 710 - Conductive component; 711 - First conductive component; 712 - Second conductive component; 713 - Fuse; 720 - First insulating component; 721 - Third through hole; 730 - Second insulating component; 731 - First through hole; 732 - Second through hole; 733 - Opening; 80 - Sampling structure; 810 - Sampling line.

[0049] The accompanying drawings are not drawn to scale. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0052] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0056] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0058] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0059] The battery cell in this application embodiment can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. For example, the battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0060] The electrode assembly in this embodiment includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0061] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0062] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0063] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0064] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0065] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0066] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0068] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0069] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0070] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0071] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0072] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0073] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0074] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0075] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0076] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0077] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0078] Liquid electrolytes include electrolyte salts and solvents.

[0079] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0080] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0081] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0082] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0083] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0084] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0085] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0086] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0087] In some implementations, the electrode assembly is a stacked structure.

[0088] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0089] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0090] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0091] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0092] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0093] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0094] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0096] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0097] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0098] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0099] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0100] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0101] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0102] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0103] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0104] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0105] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0106] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0107] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0108] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0109] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0110] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0111] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0112] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0113] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0114] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0115] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery clusters may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0116] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0117] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0118] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0119] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0120] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0121] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0122] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and Ethernet and fiber optic conversion modules.

[0123] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0124] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0125] Currently, energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. In the development of battery technology, battery devices typically incorporate sampling structures that collect voltage data from individual battery cells during use. Specifically, the sampling lines of this structure are electrically connected to fuses on the busbars within the battery device. If the sampling lines are damaged under different operating conditions or experience performance degradation due to insulation failure, accurate voltage data becomes difficult to obtain, reducing the battery's performance and lifespan. For example, during the assembly of the sampling structure, fuses are usually welded to the busbars. To mitigate the risk of reduced weld strength due to oxidation, adhesive is typically applied to the weld area. However, this adhesive application results in an uneven surface in the welded area and increases processing and assembly costs, further reducing the battery's performance. Therefore, improving the performance of battery devices has become a pressing technical problem in this field.

[0126] Therefore, embodiments of this application provide a battery device, an electrical device, and an energy storage device. The battery device includes: a plurality of battery cells, a busbar, a fuse, a sampling structure, and a second insulating component. The busbar is configured to electrically connect different battery cells. The fuse is stacked with the busbar in a first direction. The sampling structure includes a sampling line, which is electrically connected to the busbar through the fuse. The fuse includes a conductive component and a first insulating component. The conductive component includes a first conductive component, a second conductive component, and a fuse. The first conductive component and the second conductive component are spaced apart. The first conductive component is connected to the sampling line, and the second conductive component is connected to the busbar. The fuse connects the first conductive component and the second conductive component. At least a portion of the first insulating component is located between the first conductive component and the busbar. At least a portion of the second insulating component is located on the side of the fuse away from the busbar along the first direction. Along the first direction, at least a portion of the surface of the second conductive component is covered by the second insulating component, and at least a portion of the surface of the busbar is covered by the second insulating component. Thus, in this embodiment, the battery device is configured to include multiple battery cells, a busbar, a fuse, a sampling structure, and a second insulating component. The sampling line of the sampling structure is electrically connected to the busbar through the fuse. The fuse includes a conductive component and a first insulating component. The conductive component includes a first conductive component, a second conductive component, and a fuse. The first conductive component and the second conductive component are spaced apart. The first conductive component is connected to the sampling line, and the second conductive component is connected to the busbar. The fuse connects the first conductive component and the second insulating component. At least a portion of the first insulating component is located between the first conductive component and the busbar, and at least a portion of the second insulating component is located between the first conductive component and the busbar. Along the first direction away from the busbar component, at least a portion of the surface of the second conductive component is covered by the second insulating component. This reduces the risk of oxidation in the connection area between the second conductive component and the busbar component, which could lead to a decrease in connection strength. This improves the connection strength between the fuse and the busbar component, balancing the connection strength between the fuse and the busbar component with the assembly performance of the battery device. Simultaneously, by covering at least a portion of the surface of the busbar component with the second insulating component, the risk of short circuits caused by contact between the busbar component and other components is reduced, thereby improving the structural stability between the fuse and the busbar component and ultimately enhancing the performance of the battery device.

[0127] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0128] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0129] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0130] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0131] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0132] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include multiple battery cells 20. The battery device 10 may also include a housing 11 (or cover), which has a hollow interior structure, and the multiple battery cells 20 are housed within the housing 11. For example, the multiple battery cells 20 may be connected in parallel, series, or a mixed configuration and then placed inside the housing 11.

[0133] like Figure 2 As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0134] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0135] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0136] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0137] Figure 3 This diagram shows an exploded view of the battery cell 20 provided in one embodiment of the present application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving cavity 50, and the electrode assembly 22 is placed in the receiving cavity 50 within the housing 21. The housing 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with at least one opening; the end cap 212 is used to fasten with the shell 211 to form the housing 21 with the closed receiving cavity 50.

[0138] In some embodiments, the end cap 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the end cap 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0139] It should be understood that if the end cap 212 is a plate-like structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the end cap 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the end cap 212 can be set as two, with the two end caps 212 respectively covering the openings at both ends of the shell 211.

[0140] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0141] It should be understood that the end cap 212 in this embodiment is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the shell 211 has a cuboid structure, and the end cap 212 has a rectangular plate structure that is adapted to the shell 211.

[0142] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may be the same as or different from that of the housing 211; the materials of the different walls of the housing 211 may also be the same or different.

[0143] The end cap 212 in this embodiment can be any wall of the outer shell 21. For example, the end cap 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap 212 can also be other structures. For example, the end cap 212 can also be a groove with an opening to cover the opening of the housing 211. This embodiment is not limited to this.

[0144] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figure 3 and Figure 4 As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, if the first electrode terminal 214a is a positive electrode terminal, it is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22; if the second electrode terminal 214b is a negative electrode terminal, it is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The first electrode terminal 214a and the positive electrode tab 222a can be directly connected or indirectly connected, as can the second electrode terminal 214b and the negative electrode tab 222b. Exemplarily, the first electrode terminal 214a can be electrically connected to the positive electrode tab 222a via an adapter 23, and the second electrode terminal 214b can be electrically connected to the negative electrode tab 222b via an adapter 23. It should be understood that in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as electrode tab 222.

[0145] In this embodiment, the wall of the housing 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20. Figure 3 and Figure 4 The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 is a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0146] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0147] In some implementations, a support member 215 may also be provided in the battery cell 20. The support member 215 may be fixed between the electrode assembly 22 and the wall of the housing 211 facing the electrode assembly 22, so as to form an exhaust channel communicating with the pressure relief mechanism 213 between the support member and the wall of the housing 211 facing the electrode assembly 22. In the event that the battery cell 20 is subjected to external impact, the support member 215 can reduce the risk that the impact of the electrode assembly 22 on the pressure relief mechanism 213 will cause the pressure relief mechanism 213 to be actuated prematurely.

[0148] In some implementations, an insulating element may also be provided in the battery cell 20. The insulating element is disposed in the accommodating space of the housing 211, and the insulating element may be a hollow structure with one or more openings. The accommodating space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20.

[0149] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0150] The pressure relief mechanism 213 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0151] Figure 5 An exploded view of the battery device 10 provided in another embodiment of the application is shown. Figure 6 A top view schematic diagram of a battery device 10 provided in an embodiment of this application is shown. Figure 7 A top view is shown of the safety device 70 and the busbar component 60 provided in one embodiment of this application after being assembled together. Figure 8 This is a partially enlarged top view of a safety device 70 and a busbar component 60 assembled together according to an embodiment of this application. Figure 9 An exploded structural diagram of a safety device 70 provided in one embodiment of this application is shown. Exemplarily, Figure 6 Can be Figure 5 The diagram shows a top view of the battery device 10. Figure 8 Can be Figure 7 The diagram shows a partially enlarged top view of the safety device 70 and the busbar component 60 after they are assembled together.

[0152] In some implementations, such as Figures 5 to 8As shown, the battery device 10 includes: a plurality of battery cells 20, a busbar 60, a fuse 70, a sampling structure 80, and a second insulating component 730. The busbar 60 is configured to electrically connect different battery cells 20. The fuse 70 is stacked with the busbar 60 in a first direction. The sampling structure 80 includes a sampling line 810, which is electrically connected to the busbar 60 through the fuse 70. The fuse 70 includes a conductive component 710 and a first insulating component 720. The conductive component 710 includes a first conductive component 711, a second conductive component 712, and a fuse portion 713. The first conductive component 711 and the second conductive component 712 are connected together. The components are arranged at intervals of 712. The first conductive component 711 is connected to the sampling line 810, and the second conductive component 712 is connected to the bus component 60. The fuse part 713 connects the first conductive component 711 and the second conductive component 712. At least a portion of the first insulating component 720 is located between the first conductive component 711 and the bus component 60. At least a portion of the second insulating component 730 is located on the side of the safety device 70 away from the bus component 60 along the first direction. Along the first direction, at least a portion of the surface of the second conductive component 712 is covered by the second insulating component 730, and at least a portion of the surface of the bus component 60 is covered by the second insulating component 730.

[0153] It should be understood that, for ease of description, three directions can be defined in this embodiment: direction X, direction Y, and direction Z. Direction X can be the arrangement direction of the plurality of battery cells 20, or direction X can be the thickness direction of the battery cell 20; direction Y can be the length direction of the battery cell 20, and direction Y is perpendicular to direction X; direction Z can be the height direction of the battery cell 20, and direction Z is perpendicular to directions X and Y. For example, the first direction in this embodiment can be the aforementioned direction Z.

[0154] It should also be understood that the battery device 10 in the embodiments of this application may include a plurality of battery cells 20, which may be arranged in a direction perpendicular to the first direction. For example, the plurality of battery cells 20 may be arranged in direction X.

[0155] It should also be understood that the busbar component 60 in this embodiment can be electrically connected to different battery cells 20. Specifically, the busbar component 60 can be electrically connected to the electrode terminals 214 of multiple different battery cells 20 to achieve electrical connection between the multiple different battery cells 20. It should also be understood that the material of the busbar component 60 in this embodiment can be one of the following: copper, aluminum, or an alloy.

[0156] It should also be understood that the sampling structure 80 in this embodiment can be disposed within the housing 11 of the battery device 10. The sampling structure 80 is used for electrical connection with the circuit board corresponding to the battery management system of the battery device 10. The sampling structure 80 is provided with a sampling line 810, which can be electrically connected to the fuse device 70 on the busbar 60 to obtain the voltage value of the battery cell 20 through the sampling line 810. In other embodiments, the current value of the battery cell 20 can also be obtained through the sampling line 810.

[0157] It should also be understood that the safety device 70 in the embodiments of this application is stacked with the busbar component 60 in the first direction, which may mean that the safety device 70 is connected to the surface of the busbar component 60 facing the battery cell 20, or it may mean that the safety device 70 is connected to the surface of the busbar component 60 away from the battery cell 20.

[0158] It should also be understood that the safety device 70 in this embodiment is configured to include a conductive component 710 and a first insulating component 720. The conductive component 710 is configured to include a first conductive component 711, a second conductive component 712, and a fuse 713. The fact that the first conductive component 711 and the second conductive component 712 are spaced apart can mean that the first conductive component 711 and the second conductive component 712 are not in direct contact, and that the first conductive component 711 and the second conductive component 712 are electrically connected through the fuse 713.

[0159] It should also be understood that the connection between the first conductive component 711 and the sampling line 810 in the embodiments of this application can mean that a portion of the first conductive component 711 can be welded to the sampling line 810 to achieve an electrical connection between the first conductive component 711 and the sampling structure 80.

[0160] It should also be understood that the fuse portion 713 connected between the first conductive component 711 and the second conductive component 712 in the embodiments of this application can be configured to melt and disconnect the electrical connection between the sampling line 810 and the bus component 60 in the event of a short circuit in the battery cell 20 or the sampling structure 80. It should also be understood that the fuse portion 713 can be integrally formed with the first conductive component 711 and the second conductive component 712 or formed separately. When the fuse portion 713 is integrally formed with the first conductive component 711 and the second conductive component 712, the fuse portion 713, the first conductive component 711, and the second conductive component 712 can be integrally formed by stamping or cutting; or when the fuse portion 713 is separately formed with the first conductive component 711 and the second conductive component 712, the fuse portion 713, the first conductive component 711, and the second conductive component 712 can be connected by welding.

[0161] It should also be understood that the material of the fuse portion 713 in the embodiments of this application may be set to include at least one of the following materials: aluminum, copper, lead, tin, aluminum-magnesium alloy, lead-antimony alloy.

[0162] It should also be understood that at least a portion of the second insulating member 730 in this embodiment is disposed on the side of the safety device 70 away from the busbar 60 along the first direction, and at least a portion of the surface of the second conductive member 712 is covered by the second insulating member 730 along the first direction. This increases the creepage distance between the second conductive member 712 of the safety device 70 and other components, reduces the risk of short circuit in the battery device 10 caused by contact between the second conductive member 712 and other components, thereby improving the performance of the battery device 10. It should also be understood that the materials of the first insulating member 720 and the second insulating member 730 in this embodiment can both be one of the following materials: rubber, silicone, or plastic.

[0163] It should also be understood that, along the first direction, at least a portion of the surface of the busbar 60 being covered by the second insulating member 730 can mean that, on a projection plane perpendicular to the first direction, the orthographic projection of the busbar 60 lies within the orthographic projection of the second insulating member 730. It should also be understood that, in the first direction, the second insulating member 730 may also cover at least a portion of the first wall 216 of the battery cell 20.

[0164] In this embodiment, the battery device 10 is configured to include multiple battery cells 20, a busbar 60, a fuse 70, a sampling structure 80, and a second insulating component 730. The sampling line 810 of the sampling structure 80 is electrically connected to the busbar 60 via the fuse 70. The fuse 70 includes a conductive component 710 and a first insulating component 720. The conductive component 710 includes a first conductive component 711, a second conductive component 712, and a fuse 713. The first conductive component 711 and the second conductive component 712 are spaced apart. The first conductive component 711 is connected to the sampling line 810, and the second conductive component 712 is connected to the busbar 60. The fuse 713 connects the first conductive component 711 and the second conductive component 712. At least a portion of the first insulating component 720 is located between the first conductive component 711 and the busbar 60. At least a portion of the second insulating component 730 is located on the side of the fuse device 70 away from the busbar 60 along the first direction. Along the first direction, at least a portion of the surface of the second conductive component 712 is covered by the second insulating component 730. This reduces the risk of oxidation in the connection area between the second conductive component 712 and the busbar 60, which could lead to a decrease in connection strength. This improves the connection strength between the fuse device 70 and the busbar 60, balancing the connection strength between the fuse device 70 and the busbar 60 with the assembly performance of the battery device 10. At the same time, by covering at least a portion of the surface of the busbar 60 with the second insulating component 730, the risk of short circuits caused by contact between the busbar 60 and other components is reduced, thereby improving the structural stability between the fuse device 70 and the busbar 60 and ultimately improving the performance of the battery device 10.

[0165] In some implementations, such as Figure 8 and Figure 9 As shown, the second insulating component 730 includes a first through hole 731 extending along the first direction, at least a portion of the surface of the first conductive component 711 is exposed through the first through hole 731, and the sampling line 810 is connected to the first conductive component 711 through the first through hole 731.

[0166] It should also be understood that the shape of the first through hole 731 in the embodiments of this application on the projection plane perpendicular to the first direction can be set according to actual needs. For example, the shape of the first through hole 731 can be set as a circle, ellipse, polygon, rectangle, etc. As an example, the embodiments of this application do not limit this.

[0167] It should also be understood that the first through hole 731 in this embodiment can also be configured to include an opening 733 facing the edge of the busbar 60. That is, on the projection plane perpendicular to the first direction, the first through hole 731 may include an opening 733 facing the geometric center of the busbar 60 away from the busbar 60. Compared with the prior art, which requires the sampling line 810 to be bent toward the first through hole 731 on the side away from the first conductive component 711, the sampling line 810 of the sampling structure 80 in this embodiment can enter the first through hole 731 through the opening 733, so that the sampling line 810 can be directly connected to the first conductive component 711 without bending the sampling line 810 multiple times. It can also reduce the height occupied by the sampling line 810 and the first conductive component 711 in the battery device 10 along the first direction during the connection process, improve the assembly performance between the sampling line 810 and the first conductive component 711, and improve the space utilization rate inside the battery device 10. It should also be understood that the number of the first through holes 731 in the embodiments of this application can be set according to actual needs. For example, the number of the first through holes 731 can be set to one or more, and each first through hole 731 can correspond to a sampling line 810. As an example, the embodiments of this application do not limit this.

[0168] In this embodiment, the second insulating component 730 is configured to include a first through hole 731 extending along the first direction. At least a portion of the surface of the first conductive component 711 is exposed through the first through hole 731. The sampling line 810 is connected to the first conductive component 711 through the first through hole 731, so as to connect the sampling line 810 of the sampling structure 80 to the first conductive component 711, thereby improving the assembly performance and connection strength between the sampling line 810 and the safety device 70, and thus improving the usability and assembly performance of the battery device 10.

[0169] In some implementations, such as Figure 8 and Figure 9 As shown, along the first direction, the first conductive component 711 covers the first through hole 731.

[0170] It should be understood that, along the first direction, the first conductive component 711 covering the first through hole 731 can mean that the area of ​​the first through hole 731 on the projection plane perpendicular to the first direction is smaller than the area of ​​the first conductive component 711 on the projection plane perpendicular to the first direction, and the sampling line 810 of the sampling structure 80 is welded to the first conductive component 711 through the first through hole 731.

[0171] In this embodiment of the application, by setting the first conductive component 711 to cover the first through hole 731 along the first direction, the risk of short circuit of the battery device 10 caused by the exposed part of the first conductive component 711 overlapping with other components through the first through hole 731 is reduced, and the risk of the first conductive component 711 falling off from the first through hole 731 is also reduced, thereby improving the performance of the battery device 10.

[0172] In some implementations, the entire surface of the second conductive component 712 is covered by the second insulating component 730 along the first direction. Thus, in this embodiment, by covering the entire surface of the second conductive component 712 with the second insulating component 730 along the first direction, the risk of oxidation in the connection area between the second conductive component 712 and the busbar component 60, leading to a decrease in connection strength, can be effectively reduced. This effectively improves the connection strength between the safety device 70 and the busbar component 60, balancing the connection strength between the safety device 70 and the busbar component 60 with the assembly performance of the battery device 10. Furthermore, it further improves the structural stability between the safety device 70 and the busbar component 60, thereby enhancing the performance of the battery device 10.

[0173] Figure 10 An exploded view of the safety device 70 provided in another embodiment of this application is shown.

[0174] In some implementations, such as Figure 10 As shown, the second insulating component 730 also includes a second through hole 732 extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the second through hole 732 and the orthographic projection of the second conductive component 712, and there is no overlapping area between the orthographic projection of the second through hole 732 and the orthographic projection of the first through hole 731.

[0175] It should be understood that the shape of the second through hole 732 on the projection plane perpendicular to the first direction in this application embodiment can be set according to actual needs. For example, the shape of the second through hole 732 can be set as a circle, ellipse, polygon, rectangle, etc. As an example, this application embodiment does not limit this.

[0176] In this embodiment, by configuring the second insulating component 730 to include a second through hole 732 extending along the first direction, there is an overlapping area between the orthographic projection of the second through hole 732 and the orthographic projection of the second conductive component 712 on a projection plane perpendicular to the first direction, and there is no overlapping area between the orthographic projection of the second through hole 732 and the orthographic projection of the first through hole 731. The busbar component 60 and the second conductive component 712 can be connected through the second through hole 732 without going through the second insulating component 730, thereby facilitating the connection between the busbar component 60 and the second conductive component 712, effectively reducing the assembly difficulty between the safety device 70 and the busbar component 60, and thus improving the assembly performance and usability of the battery device 10.

[0177] In some implementations, such as Figure 10 As shown, along the first direction, the second conductive component 712 covers the second through hole 732. Thus, in this embodiment, by configuring the second conductive component 712 to cover the second through hole 732 along the first direction, the risk of a short circuit in the battery device 10 caused by the exposed portion of the second conductive component 712 through the second through hole 732 overlapping with other components is reduced. Simultaneously, the risk of the second conductive component 712 detaching from the second through hole 732 is reduced, thereby improving the performance of the battery device 10.

[0178] Figure 11 An exploded view of the safety device 70 provided in another embodiment of this application is shown.

[0179] In some implementations, such as Figure 11 As shown, the first insulating component 720 includes a third through hole 721 extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the third through hole 721 and the orthographic projection of the second through hole 732.

[0180] It should be understood that the shape of the third through hole 721 in the embodiments of this application on the projection plane perpendicular to the first direction can be set according to actual needs. For example, the shape of the third through hole 721 can be set as a circle, ellipse, polygon, rectangle, etc. As an example, the embodiments of this application do not limit this.

[0181] It should also be understood that the portion of the second conductive component 712 exposed on the side facing the busbar 60 and through the third through hole 721 can be welded to the side of the busbar 60 facing the second conductive component 712, thereby improving the connection strength between the second conductive component 712 and the busbar 60.

[0182] In this embodiment, the first insulating component 720 is configured to include a third through hole 721 extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the third through hole 721 and the orthographic projection of the second through hole 732. During the connection between the busbar 60 and the second conductive component 712, it is not necessary to go through the first insulating component 720 and the second insulating component 730. This allows the busbar 60 to be directly connected to the second conductive component 712 through the second through hole 732 and the third through hole 721, effectively reducing the assembly difficulty between the safety device 70 and the busbar 60, while improving the connection strength between the busbar 60 and the second conductive component 712, thereby improving the assembly performance and usability of the battery device 10.

[0183] In some implementations, the orthographic projections of the second through-hole 732 and the third through-hole 721 overlap on the projection plane perpendicular to the first direction. Thus, in this embodiment, by setting the orthographic projections of the second through-hole 732 and the third through-hole 721 to overlap on the projection plane perpendicular to the first direction, the connection between the busbar 60 and the second conductive component 712 does not require passing through the first insulating component 720 and the second insulating component 730. This allows the busbar 60 to be directly connected to the second conductive component 712 through the second through-hole 732 and the third through-hole 721, further reducing the assembly difficulty between the safety device 70 and the busbar 60, and effectively improving the connection strength between the busbar 60 and the second conductive component 712, thereby further improving the assembly and performance of the battery device 10.

[0184] In some implementations, such as Figure 8 As shown, on the projection plane perpendicular to the first direction, the minimum dimension D1 between the second insulating component 730 and the safety device 70 satisfies: 2mm≤D1≤10mm.

[0185] For example, on the projection plane perpendicular to the first direction, the minimum dimension D1 between the second insulating component 730 and the safety device 70 can be set to: 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc., or its value is within the range obtained by any combination of the above two values.

[0186] In this embodiment, on the projection plane perpendicular to the first direction, by setting the minimum dimension D1 between the second insulating component 730 and the safety device 70 to satisfy: 2mm≤D1≤10mm, when the safety device 70 is connected to the busbar 60, it is convenient to assemble the second insulating component 730 to the side of the safety device 70 away from the busbar 60, effectively reducing the risk of oxidation in the connection area between the safety device 70 and the busbar 60, taking into account the connection strength between the safety device 70 and the busbar 60 and the processing and manufacturing cost, thereby improving the performance and assembly performance of the battery device 10.

[0187] In some implementations, such as Figure 8 As shown, on the projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device 70 and the busbar component 60 satisfies: 0.5mm≤D2≤2mm.

[0188] For example, on the projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device 70 and the busbar component 60 can be set to: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc., or its value is within the range obtained by any combination of the above two values.

[0189] In this embodiment, on the projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device 70 and the busbar 60 is set to satisfy: 0.5mm≤D2≤2mm, so as to connect the sampling line 810 to the first conductive component 711, and reduce the risk of short circuit of the battery device 10 caused by the overlap between the edge of the conductive component 710 in the safety device 70 and the edge of the busbar 60, thereby improving the performance of the battery device 10 in use and assembly.

[0190] In some implementations, such as Figures 5 to 9 As shown, the busbar 60 is connected to the first wall 216 of the battery cell 20 along the first direction toward the busbar 60, and the safety device 70 is connected to the surface of the busbar 60 along the first direction away from the first wall 216.

[0191] It should be understood that the first wall 216 in the embodiments of this application includes, but is not limited to, the following examples: the first wall 216 may be the wall with the smallest area of ​​the outer shell 21 of the battery cell 20; the first wall 216 may also be the wall with the largest area of ​​the outer shell 21 of the battery cell 20; the first wall 216 may be the wall of the battery cell 20 on which the electrode terminals 214 are provided; the first wall 216 may be the wall opposite to or adjacent to the wall of the battery cell 20 on which the pressure relief mechanism 213 is provided.

[0192] It should also be understood that the connection of the busbar 60 to the first wall 216 of the battery cell 20 along the first direction toward the busbar 60 can mean that the busbar 60 is electrically connected to the electrode terminal 214 on the first wall 216 of the battery cell 20 toward the busbar 60.

[0193] It should also be understood that the connection of the safety device 70 to the surface of the busbar 60 on the side away from the first wall 216 along the first direction may mean that at least a portion of the surface of the second conductive component 712 in the safety device 70 facing the busbar 60 is welded to a portion of the surface of the busbar 60 facing the second conductive component 712.

[0194] In this embodiment, by configuring the busbar 60 as connected to the first wall 216 of the battery cell 20 along the first direction toward the busbar 60, and configuring the safety device 70 as connected to the surface of the busbar 60 along the first direction away from the first wall 216, it is easier to assemble the safety device 70 onto the busbar 60, and at the same time, the assembly difficulty between the sampling line 810 of the sampling structure 80 and the first conductive component 711 is reduced, thereby improving the assembly performance and usability of the battery device 10.

[0195] In some implementations, such as Figure 7 and Figure 8 The area of ​​the busbar 60 near the safety device 70 is configured as an arc-shaped structure.

[0196] It should be understood that the area of ​​the busbar 60 near the safety device 70 in this embodiment can be configured as an arc-shaped structure to reduce the risk of damage to the sampling line 810 or the safety device 70 due to bending or warping of the edge area of ​​the busbar 60 under different operating conditions of the battery device 10. It should also be understood that the area of ​​the first conductive component 711 or the second conductive component 712 in the safety device 70 near the busbar 60 can also be configured as an arc-shaped structure.

[0197] In this embodiment, by setting the area of ​​the busbar 60 near the safety device 70 to an arc shape, the influence of the edge of the busbar 60 on the sampling line 810 is reduced during the process of connecting the sampling line 810 of the sampling structure 80 to the first conductive component 711 of the safety device 70. For example, if the edge area of ​​the busbar 60 is set to a right angle, the sampling line 810 is more likely to be damaged. At the same time, the influence of the edge of the busbar 60 on the safety device 70 during bending can be reduced, thereby improving the performance and manufacturing performance of the battery device 10.

[0198] In some implementations, the conductive component 710, the bus component 60, and the sampling line 810 are made of the same material.

[0199] It should be understood that the conductive component 710, the bus component 60 and the sampling line 810 in the embodiments of this application can all be made of one of the following materials: copper, aluminum or alloy.

[0200] In this embodiment, by making the conductive component 710, the busbar component 60, and the sampling line 810 the same material, the sampling line 810 of the sampling structure 80 is welded to the first conductive component 711 in the conductive component 710, and the second conductive component 712 in the conductive component 710 is welded to the busbar component 60. This improves the connection strength between the first conductive component 711 and the sampling line 810, and the connection strength between the second conductive component 712 and the busbar component 60, thereby improving the assembly performance of the battery device 10 and reducing processing and manufacturing costs.

[0201] In some implementations, the second conductive component 712 is welded to the bus component 60. Exemplarily, the second conductive component 712 and the bus component 60 can be connected by laser welding.

[0202] In this embodiment of the application, by welding the second conductive component 712 to the busbar component 60, the connection strength between the second conductive component 712 and the busbar component 60 can be effectively improved, thereby improving the assembly performance and usability of the battery device 10.

[0203] According to some embodiments of this application, this application also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0204] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0205] According to some embodiments of this application, this application also provides an energy storage device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to store electrical energy for the energy storage device.

[0206] Based on some embodiments of this application, see again the above. Figures 5 to 11As shown, a battery device 10 is provided, comprising: a plurality of battery cells 20, a busbar 60, a fuse 70, a sampling structure 80, and a second insulating component 730. The busbar 60 is configured to electrically connect different battery cells 20. The fuse 70 is stacked with the busbar 60 in a first direction. The sampling structure 80 includes a sampling line 810, which is electrically connected to the busbar 60 through the fuse 70. The fuse 70 includes a conductive component 710 and a first insulating component 720. The conductive component 710 includes a first conductive component 711, a second conductive component 712, and a fuse 730. The first conductive component 711 is connected to the second insulating component 730. Two conductive components 712 are spaced apart. The first conductive component 711 is connected to the sampling line 810, and the second conductive component 712 is connected to the busbar 60. A fuse 713 connects the first conductive component 711 and the second conductive component 712. At least a portion of the first insulating component 720 is located between the first conductive component 711 and the busbar 60, and at least a portion of the second insulating component 730 is located on the side of the safety device 70 away from the busbar 60 along the first direction. Along the first direction, at least a portion of the surface of the second conductive component 712 is covered by the second insulating component 730, and at least a portion of the surface of the busbar 60 is covered by the second insulating component 730. The second insulating component 730 includes a first through-hole 731 extending along the first direction, through which at least a portion of the surface of the first conductive component 711 is exposed. The sampling line 810 is connected to the first conductive component 711 through the first through-hole 731. The second insulating component 730 further includes a second through hole 732 extending along the first direction. On a projection plane perpendicular to the first direction, the orthographic projection of the second through hole 732 overlaps with the orthographic projection of the second conductive component 712, but there is no overlap between the orthographic projection of the second through hole 732 and the orthographic projection of the first through hole 731. The first insulating component 720 includes a third through hole 721 extending along the first direction. On a projection plane perpendicular to the first direction, the orthographic projection of the third through hole 721 overlaps with the orthographic projection of the second through hole 732. On a projection plane perpendicular to the first direction, the minimum dimension D1 between the second insulating component 730 and the safety device 70 satisfies: 2mm ≤ D1 ≤ 10mm. On a projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device 70 and the busbar component 60 satisfies: 0.5mm ≤ D2 ≤ 2mm.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells; A busbar is configured to electrically connect the different battery cells; The safety device is stacked on top of the busbar component in the first direction; The sampling structure includes a sampling line, which is electrically connected to the busbar component via the safety device. The safety device includes a conductive component and a first insulating component. The conductive component includes a first conductive component, a second conductive component, and a fuse. The first conductive component and the second conductive component are spaced apart. The first conductive component is connected to the sampling line, and the second conductive component is connected to the busbar. The fuse connects the first conductive component and the second conductive component. At least a portion of the first insulating component is located between the first conductive component and the busbar. A second insulating component, at least a portion of which is located on the side of the safety device away from the busbar in the first direction, wherein at least a portion of the surface of the second conductive component is covered by the second insulating component in the first direction, and at least a portion of the surface of the busbar is covered by the second insulating component.

2. The battery device of claim 1, wherein The second insulating component includes a first through-hole extending along the first direction, at least a portion of the surface of the first conductive component is exposed through the first through-hole, and the sampling line is connected to the first conductive component through the first through-hole.

3. The battery device of claim 2, wherein Along the first direction, the first conductive component covers the first through hole.

4. The battery device of claim 1, wherein Along the first direction, the entire surface of the second conductive component is covered by the second insulating component.

5. The battery device of claim 2, wherein The second insulating component further includes a second through hole extending along the first direction. On a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the second through hole and the orthographic projection of the second conductive component, and there is no overlapping area between the orthographic projection of the second through hole and the orthographic projection of the first through hole.

6. The battery device of claim 5, wherein Along the first direction, the second conductive component covers the second through hole.

7. The battery device of claim 5, wherein The first insulating component includes a third through hole extending along the first direction, and on a projection plane perpendicular to the first direction, there is an overlapping area between the orthographic projection of the third through hole and the orthographic projection of the second through hole.

8. The battery device according to claim 7, characterized in that, On a projection plane perpendicular to the first direction, the orthographic projection of the second through hole overlaps with the orthographic projection of the third through hole.

9. The battery device of claim 1, wherein, On the projection plane perpendicular to the first direction, the minimum dimension D1 between the second insulating component and the safety device satisfies: 2mm≤D1≤10mm.

10. The battery device of claim 1, wherein On the projection plane perpendicular to the first direction, the minimum dimension D2 between the safety device and the busbar component satisfies: 0.5mm≤D2≤2mm.

11. The battery device according to any one of claims 1 to 10, wherein The current-carrying component is connected to the first wall of the battery cell facing the current-carrying component along the first direction, and the safety device is connected to the surface of the current-carrying component away from the first wall along the first direction.

12. The battery device according to any one of claims 1 to 10, wherein The area of ​​the busbar component near the safety device is configured with an arc-shaped structure.

13. The battery device according to any one of claims 1 to 10, wherein The conductive component, the bus component, and the sampling line are made of the same material.

14. The battery device according to any one of claims 1 to 10, wherein The second conductive component is welded to the bus component.

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

16. An energy storage device, comprising: include: The battery device according to any one of claims 1 to 14, wherein the battery device is used to store electrical energy for the energy storage device.

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