Battery device and electric device

Abstract

The application provides a battery device and a power consumption device. The battery device comprises a plurality of battery monomers, a plurality of busbars, an insulating covering part and an insulating protection part. The battery monomers are electrically connected through the busbars. The plurality of busbars comprises a first busbar. The first busbar is arranged on one side of the battery monomers along a first direction. The first busbar comprises a fuse part. The insulating covering part covers at least a surface of the fuse part facing the battery monomers along the first direction and two opposite surfaces along a third direction. Part of the fuse part is exposed from the side of the fuse part away from the battery monomers along the first direction. The insulating protection part covers at least the side of the busbar and the insulating covering part away from the battery monomers along the first direction. The insulating protection part is formed with a weak part. The projection of at least one part of the fuse part exposed from the side of the fuse part away from the battery monomers along the first direction overlaps with the projection of the weak part along the first direction. The application can reduce the risk of fire in the case of short circuit or thermal runaway.

Description

Technical Field

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

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage battery boxes or directly on the user side.

[0003] How to reduce the risk of battery fires in the event of a short circuit or thermal runaway is one of the topics that the industry needs to study. Summary of the Invention

[0004] This application provides a battery device and an electrical device that can reduce the risk of fire in the event of a short circuit or thermal runaway.

[0005] The technical solution of this application embodiment is implemented as follows: The first aspect of this application provides a battery device, comprising: a plurality of battery cells; a plurality of busbars, wherein the battery cells are electrically connected to each other via the busbars, the plurality of busbars including a first busbar disposed on one side of the battery cells along a first direction, the first busbar including a first part, a second part and a fuse part, the first part and the second part being respectively connected to the two ends of the fuse part along a second direction, and the first part and the second part being respectively electrically connected to two battery cells; an insulating covering part, the insulating covering part covering at least the surface of the fuse part facing the battery cells along the first direction, and also covering two opposing surfaces of the fuse part along a third direction, a portion of the fuse part being exposed from its side facing away from the battery cells along the first direction, the first direction, the second direction and the third direction intersecting each other; an insulating protective member, the insulating protective member at least covering the busbars and the insulating covering part on the side facing away from the battery cells along the first direction, the insulating protective member having a weak portion projected into the same projection plane along the first direction, at least one of the fuse parts having an overlapping portion between the projection of the portion exposed from its side facing away from the battery cells along the first direction and the projection of the weak portion.

[0006] In the embodiments of this application, the insulating covering portion covers the side of the fusible portion facing the battery cell and the opposite sides of the fusible portion along a third direction. This makes it difficult for the molten liquid of the fusible portion to splash to the sides of the third direction and the side facing the battery cell. The molten liquid is blocked from multiple directions, and most of the molten liquid of the fusible portion splashes out from the insulating covering portion to the side facing away from the battery cell along the first direction. Furthermore, under the action of the splashed molten liquid, the weak part of the insulating protective component breaks, allowing the molten liquid and heat to splash out of the closed gap between the insulating protective component and the battery cell, thereby quickly releasing the molten material and heat, reducing the probability of a sharp increase in local temperature, and thus reducing the risk of fire.

[0007] In some embodiments, the cross-sectional area of ​​the first busbar at the fused portion is smaller than the cross-sectional area of ​​the first busbar at other portions, and the cross-section is perpendicular to the second direction.

[0008] Thus, the cross-sectional area of ​​the first busbar at the fuse point is smaller than the cross-sectional area of ​​the first busbar in other parts, making it most likely that the first busbar will melt at the fuse point. In the event of a short circuit or thermal runaway in a battery cell, the fuse point of the first busbar will melt, breaking the electrical connection between the battery cells, thereby disconnecting the conductive circuit, controlling the short circuit or thermal runaway in time, reducing the amount of energy released by the battery cells, and reducing the risk of fire caused by excessive energy release.

[0009] In some embodiments, the insulating covering portion further covers the portion of the fuse portion facing away from the battery cell along the first direction, and the insulating covering portion has a first outlet on the side facing away from the battery cell along the first direction, through which a portion of the fuse portion is exposed.

[0010] Thus, the insulating covering also covers the part of the fuse portion facing away from the battery cell along the first direction and forms a first outlet. The area of ​​the first outlet is set to be relatively small, which is conducive to the accumulation of molten liquid in the fuse portion, and then splashes outward through the first outlet. This helps to suppress the splashing area of ​​the molten liquid, further reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid, and reducing the risk of fire.

[0011] In some embodiments, the fuse portion is configured as a bent structure, and a portion of the fuse portion is recessed toward the battery cell side relative to the first and second portions.

[0012] This allows the first busbar to elongate or shorten to a certain extent in the second direction to accommodate changes in the spacing between the terminals of adjacent battery cells caused by the thermal expansion of multiple battery cells. This maintains a reliable connection between the first busbar and the battery cells, reducing the risk of open circuits. Furthermore, the fusible portion is recessed relative to the first and second portions towards the battery cell side. This allows the molten liquid in the fusible portion to be blocked by the first and second portions during splashing in the first direction away from the battery cell side. This further promotes the directional splashing and discharge of the molten liquid, reducing the diffusion of high-temperature molten liquid towards the battery cell side. This effectively reduces the risk of secondary short circuits or thermal runaway caused by the diffusion of molten liquid into the battery cells, thus reducing the risk of fire.

[0013] In some embodiments, a portion of the insulating covering portion is recessed relative to the first and second portions toward the battery cell side to form a groove, the bottom wall of the groove is formed with an embedding groove, the embedding groove has a first outlet on the inner surface of the bottom wall, a portion of the fused portion is embedded in the side wall of the groove, and another portion is embedded in the embedding groove and exposed through the first outlet.

[0014] In this way, the first outlet for the molten liquid to splash out is set on the inner surface of the bottom wall of the groove, so that the molten liquid splashed out from the first outlet is blocked by the side wall of the groove, which further promotes the directional splashing out of the molten liquid, reduces the diffusion of high temperature molten liquid to the battery cell side, thereby effectively reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid to the battery cell, and reducing the risk of fire.

[0015] In some embodiments, the fuse portion includes a plurality of connecting portions connected between the first portion and the second portion and arranged at intervals along a third direction, with the first direction, the second direction and the third direction intersecting each other.

[0016] In this way, by connecting multiple spaced connecting parts between the first part and the second part, the cross-sectional area of ​​the first busbar at the fuse point can be smaller than the cross-sectional area of ​​the first busbar at other parts, making it easier for the first busbar to melt at the fuse point. Thus, in the event of a short circuit or thermal runaway in a battery cell, the fuse point on the first busbar will melt, breaking the electrical connection between the battery cells, thereby disconnecting the conductive circuit, controlling the short circuit or thermal runaway in time, reducing the energy release of the battery cells, and reducing the risk of fire caused by excessive energy release.

[0017] In some embodiments, a perforation is formed between adjacent connecting portions along a third direction, and a portion of the insulating covering portion fills the perforation; and / or, a gap is formed between the connecting portion located at the edge along a third direction and the first and second portions, and a portion of the insulating covering portion fills the gap.

[0018] In this way, the insulating covering can more comprehensively cover all the connecting parts of the fuse, allowing the molten liquid at each connecting part to splash along the first direction towards the side opposite to the battery cell. This improves the certainty of the splash direction and reduces the diffusion of high-temperature molten liquid towards the battery cell, thereby effectively reducing the risk of secondary short circuits or thermal runaway caused by the diffusion of molten liquid into the battery cell, and reducing the risk of fire. Furthermore, by discharging the molten liquid, the possibility of molten liquid remaining in its original position and still in an electrically connected state is reduced, thereby improving the reliability of the fuse's melting.

[0019] In some embodiments, the connecting portion includes a first sub-portion, a second sub-portion, and a third sub-portion that are sequentially and cross-connected. One end of the first sub-portion is connected to the surface of the first portion facing the second portion, and the other end is inclined toward the battery cell and connected to one end of the second sub-portion. One end of the third sub-portion is connected to the surface of the second portion facing the first portion, and the other end is inclined toward the battery cell and connected to the other end of the second sub-portion. An insulating covering portion covers the surfaces of the first sub-portion and the third sub-portion facing away from the battery cell, and the surface of the second sub-portion facing away from the battery cell is exposed.

[0020] Thus, the connecting part is formed as a bent structure protruding towards the battery cell side, and the part of the connecting part facing away from the battery cell is covered by the insulating covering part, while the rest is exposed through the first outlet. This makes the area of ​​the first outlet relatively small, which is conducive to the accumulation of molten liquid in the fuse part, and then splashing outward through the first outlet. This helps to suppress the splashing area of ​​the molten liquid, further reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid, and reducing the risk of fire.

[0021] In some embodiments, the portion of the first part that overlaps with the second part along the second direction has a dimension of L1 in the third direction, and the arrangement area of ​​all connecting parts has a dimension of L2 in the third direction, with the value of L2 / L1 being greater than or equal to 30% and less than or equal to 70%.

[0022] This arrangement concentrates all connections, resulting in smaller spacing between adjacent connections. This leads to a shorter melting time difference between adjacent connections, ensuring that in the event of a short circuit or thermal runaway in a battery cell, all connections can melt promptly, breaking the electrical connection between the cells and interrupting the conductive circuit. This effectively suppresses the spread of short circuits or thermal runaway, reduces the energy release from the battery cells, and lowers the risk of fire due to excessive energy release. Furthermore, the arrangement area is sufficient for all connections, and the spacing between adjacent connections is adequate, reducing the possibility of electrical continuity between adjacent connections.

[0023] In some embodiments, the cross-sectional area of ​​each connection is the same.

[0024] In this way, by setting the cross-sectional area of ​​each connection to be the same, it is possible to reduce the melting time difference of each connection. In the event of a short circuit or thermal runaway in a battery cell, all connections can melt in time, disconnecting the electrical connection between the battery cells, thereby breaking the conductive circuit, suppressing the spread of short circuit or thermal runaway in time, reducing the energy release of the battery cells, and reducing the risk of fire caused by excessive energy release.

[0025] In some embodiments, a battery cell has a terminal post, a first part having a first positioning hole, the first part being connected to a terminal post of a battery cell, and the first positioning hole sharing a central axis with the terminal post, and a second part having a second positioning hole, the second part being connected to a terminal post of another battery cell, and the second positioning hole sharing a central axis with the terminal post, and along a third direction, the first and last connecting parts are symmetrically arranged about the line connecting the center of the first positioning hole and the center of the second positioning hole.

[0026] This configuration ensures that the lines connecting the first and last connecting parts to the center of the first positioning hole and the center of the second positioning hole are the same, and that the distances between the first and last connecting parts and the two terminals are essentially the same. This results in similar flow rates through the first and last connecting parts, which helps reduce the time difference between the melting points. In the event of a short circuit or thermal runaway in a battery cell, the connecting parts can melt in time, disconnecting the electrical connection between the battery cells, thereby breaking the conductive circuit, suppressing the spread of short circuit or thermal runaway in a timely manner, reducing the energy release of the battery cells, and lowering the risk of fire caused by excessive energy release.

[0027] In some embodiments, the line connecting the center of the first positioning hole and the center of the second positioning hole is located in the second direction, the length of the line connecting the center of the first positioning hole and the center of the second positioning hole is L3, the dimension of the connecting part along the second direction is L4, and the value of L3 / L4 is equal to 2.

[0028] In this way, the size of the connection part along the second direction is adapted to the length of the circuit conduction path between adjacent battery cells, so that the connection part will melt when the battery cell malfunctions, and will not melt within the normal temperature range due to the size of the connection part being too large, thereby improving the reliability of the fuse part.

[0029] In some embodiments, the battery device further includes a sampling component, which is disposed on the same side of the battery cell along a first direction as the first busbar. One end of the first part extends beyond the second part along a third direction and is connected to the sampling component. The first direction, the second direction, and the third direction intersect each other.

[0030] Thus, by setting the first part to be relatively long along the third direction, the first part is made close to the sampling component, which facilitates the electrical connection between the first part and the sampling component, thereby enabling sampling of the first busbar.

[0031] In some embodiments, the insulating covering is injection molded onto the surface of the fused portion.

[0032] Thus, by forming an insulating coating on the surface of the fused section through injection molding, the connection strength between the insulating coating and the fused section can be improved, the reliability of the insulating coating covering the fused section can be improved, and the possibility of the two separating under non-short circuit conditions can be reduced.

[0033] In some embodiments, the material of the insulating covering includes at least one of plastic, rubber, and silicone.

[0034] In this way, the insulating coating can be stably wrapped around the surface of the fuse. During the process of the fuse melting and breaking the conductivity, the insulating coating can act as a barrier, thereby achieving directional splashing of the molten liquid. This effectively reduces the risk of secondary short circuits or thermal runaway caused by the diffusion of molten liquid to the battery cells, and reduces the risk of fire.

[0035] In some embodiments, at least a portion of a plurality of battery cells are arranged sequentially along a second direction, which intersects with the first direction. Adjacent battery cells along the second direction are connected in series or in parallel via busbars. Among the busbars arranged in the same column along the second direction, the busbar located in the middle of the column is the first busbar.

[0036] During the thermal expansion of multiple battery cells, the displacement of battery cells closer to the edge along the second direction is greater, while the displacement of battery cells closer to the middle position along the second direction is smaller. Therefore, by placing the second busbar in the middle position, the displacement at this location is smaller during thermal expansion, which helps to reduce the possibility of the fuse of the first busbar breaking due to the displacement of the battery cells. This improves the structural reliability of the first busbar and enables the first busbar to perform its fuse protection function.

[0037] In some embodiments, the insulating protective member includes an insulating body and a cover. The insulating body has a second outlet, the cover covers the second outlet, the edge of the cover is connected to the surface of the insulating body facing away from the battery cell, and the portion of the cover corresponding to the second outlet is a weak point.

[0038] Thus, when the splashed molten liquid impacts the cover, the impact force on the cover can peel the cover off from the insulating body, allowing the second outlet to open. The second outlet is used to discharge the molten liquid and heat, thereby quickly releasing the high-temperature molten material splashed from the insulating cover and the heat accumulated inside, reducing structural damage or chain reactions caused by a sharp increase in local temperature.

[0039] A second aspect of this application provides an electrical device, in some embodiments of which the electrical device includes a plurality of battery devices provided in the second aspect, the battery devices being used to store or provide electrical energy.

[0040] Because the electrical device includes a battery device, and has all the beneficial effects of a battery device, the electrical device can reduce the risk of fire in the event of a short circuit or thermal runaway. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of an electrical device (vehicle) according to one or more embodiments; Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments; Figure 3 This is an exploded perspective view of a battery cell assembly according to one or more embodiments; Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments; Figure 5 This is a top view of a structure of a battery cell assembly according to one or more embodiments; Figure 6 A top view of another structure of a battery cell assembly according to one or more embodiments; Figure 7 This is a perspective structural diagram of a portion of a battery device according to one or more embodiments, illustrating a first busbar, an insulating covering portion, and a second busbar; Figure 8 This is a three-dimensional structural schematic diagram of a first busbar and an insulating covering portion according to one or more embodiments; Figure 9 This is a top view of a first busbar and an insulating covering portion according to one or more embodiments; Figure 10 A three-dimensional structural schematic diagram of a first busbar according to one or more embodiments; Figure 11 This is a three-dimensional structural schematic diagram of the insulating covering portion according to one or more embodiments; Figure 12 This is a side view of a first busbar and an insulating covering according to one or more embodiments; Figure 13A top view of a structure of a first bus according to one or more embodiments; Figure 14 To cover Figure 5 Top view of the insulating protective component of the medium structure; Figure 15 This is a top view of another structure of a first bus according to one or more embodiments.

[0042] Explanation of reference numerals in the attached figures: 1000, Vehicle; 100, Battery Unit; 10, Battery Box; 101, Box Cover; 102, Box Body; 200, Controller; 300, Motor; 20, Battery Cell Assembly; 1, Battery Cell; 11, Shell; 111, Housing; 112, End Cap; 12, Electrode Assembly; 121, Tab; 13, Terminal Post; 14, Pressure Relief Mechanism; 2, Busbar; 2a, First Busbar; 2b, Second Busbar; 21, First Part; 211, First Positioning Hole; 212, Recessed Area; 22, Second Part; 221, Second Positioning hole; 23, Fusible part; 231, Connecting part; 2311, First sub-part; 2312, Second sub-part; 2313, Third sub-part; 24, Hollow hole; 25, Notch; 3, Insulating covering part; 30, Groove; 31, Groove bottom wall; 311, Embedding groove; 32, Groove side wall; 4, Insulating protective component; 41, Insulating main body; 42, Covering component; 43, Weak part; 5, End plate; 6, Side plate; 7, Sampling assembly; 71, Flexible circuit board; 8, Electrical connector; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0048] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0051] The following is a detailed description of this application.

[0052] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0053] The inventors of this application have noted that in some battery devices, the busbar used for electrically connecting battery cells is formed with a fusible part that can be easily melted. The fusible part acts as a fuse. In the event of a short circuit or thermal runaway in a single battery cell, the fusible part of the busbar will melt and disconnect the electrical connection between the battery cells, thereby breaking the conductive circuit. However, the molten liquid formed after melting is prone to spread towards the battery cell side, which can easily cause a secondary short circuit or thermal runaway risk, and the risk of fire is relatively high. Furthermore, in order to reduce the probability of short circuits caused by accidental contact between battery cells and busbars and battery boxes or other conductive components, insulating protective materials (such as insulating films) are covered on the surface of battery cells and busbars. However, the installation of insulating protective materials means that the busbars are encased between the insulating protective materials and the battery cells. After the fuse of the busbar melts, high-temperature gas and high-temperature molten liquid will accumulate between the battery cells and the insulating protective materials. On the one hand, the accumulation of molten liquid may lead to the possibility of electrical conduction again. On the other hand, the high-temperature molten liquid and heat generated during the melting process accumulate between the battery cells and the insulating protective materials, which can easily cause the temperature in this area to rise sharply, thereby causing a fire.

[0054] The inventors of this application discovered through research that by covering the outer surface of the fuse portion of the busbar with an insulating covering portion, a portion of the fuse portion is exposed from the side opposite to the battery cell along a first direction, while the other portion is covered. Furthermore, a weak portion is provided in the insulating protective component corresponding to the exposed portion of the fuse portion. In the event of a short circuit fault, the insulating protective component can achieve controlled rupture at the weak portion, thereby quickly releasing the high-temperature molten material and heat splashed from the insulating covering portion. This reduces the possibility of high-temperature molten liquid and heat accumulating between the battery cell and the insulating protective component, reduces the probability of a sharp increase in local temperature, and thus reduces the risk of fire.

[0055] Based on this design concept, the inventors of this application have designed a battery device. The battery device includes multiple battery cells, an insulating covering, and multiple current collectors. The battery cells are electrically connected to each other via the current collectors. The multiple current collectors include a first current collector, which is located on one side of the battery cell along a first direction. The first current collector includes a first part, a second part, and a fuse part. The first part and the second part are respectively connected to the two ends of the fuse part along the second direction, and the first part and the second part are respectively electrically connected to two battery cells. The insulating covering at least covers the portion of the fuse part facing the battery cell along the first direction. The insulating covering also covers two opposing surfaces of the fuse portion along a third direction. The first direction, the second direction, and the third direction intersect each other. A portion of the fuse portion is exposed from the side facing away from the battery cell along the first direction. The battery device also includes an insulating protective member, which at least covers the busbar and the side of the insulating covering portion facing away from the battery cell along the first direction. The insulating protective member has a weak portion that is projected into the same projection plane along the first direction. The projection of at least one portion of the fuse portion exposed from the side facing away from the battery cell along the first direction overlaps with the projection of the weak portion.

[0056] In this design, the insulating covering is applied to the side of the fuse section facing the battery cell, and also to the opposite sides of the fuse section along a third direction. This prevents the molten liquid in the fuse section from splashing to the sides of the third direction and to the side facing the battery cell. The molten liquid is blocked from multiple directions, causing most of the molten liquid in the fuse section to splash out from the insulating covering to the side facing away from the battery cell in the first direction. Furthermore, under the action of the splashed molten liquid, the weak part of the insulating protective component breaks, allowing the molten liquid and heat to splash out of the closed gap between the insulating protective component and the battery cell. This rapidly releases the molten material and heat, reducing the probability of a sharp increase in local temperature and thus reducing the risk of fire.

[0057] The battery apparatus provided in this application embodiment 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 busbars.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0059] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0061] As an example, a battery cell assembly can be a battery module, which can be housed in a battery case by fixing the battery module in the battery case.

[0062] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0065] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0067] 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.

[0068] 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.).

[0069] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0070] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, 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.

[0071] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0072] 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.).

[0073] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0074] 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.

[0075] 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.

[0076] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not contain a negative electrode active material.

[0077] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0078] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0079] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Liquid electrolytes include electrolyte salts and solvents.

[0085] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0086] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0087] 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.

[0088] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0089] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0090] 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.

[0091] 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.

[0092] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0093] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0094] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0095] In some implementations, the electrode assembly is a stacked structure.

[0096] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0097] 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.

[0098] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0099] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0100] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0101] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0102] The technical solutions described in the embodiments of this application can be applied to electrical devices that use battery devices. The electrical device includes the battery device of any embodiment of this application, and the battery device is used to provide electrical energy.

[0103] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, 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. Aircraft generally refer to devices that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, 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 special limitations on the above-mentioned electrical devices.

[0104] The technical solutions described in the embodiments of this application can be applied to various energy storage devices that use battery devices, such as energy storage containers or energy storage cabinets.

[0105] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0106] Figure 1 This is a schematic diagram of the structure of an electrical device (vehicle 1000) according to one or more embodiments.

[0107] Vehicle 1000 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 vehicles, etc. For example... Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0108] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] Figure 2 This is an exploded perspective view of a battery device 100 according to one or more embodiments.

[0110] like Figure 2 As shown, the battery device 100 includes a battery case 10 and at least one battery cell assembly 20. The battery case 10 has a battery receiving cavity, and at least one battery cell assembly 20 is received in the battery receiving cavity.

[0111] In some embodiments of this application, the battery box 10 may include a cover 101 and a body 102. The cover 101 and the body 102 are fastened together, forming a battery receiving cavity inside the battery box 10 to house the battery cell assembly 20. This battery receiving cavity may be sealed or unsealed.

[0112] The housing 102 can be a hollow structure with one open end, and the cover 101 can be a plate-like structure. The cover 101 closes onto the open side of the housing 102 so that the cover 101 and the housing 102 together define the battery housing cavity. Alternatively, both the cover 101 and the housing 102 can be hollow structures with one open side, and the open side of the cover 101 closes onto the open side of the housing 102. Of course, the battery box 10 formed by the cover 101 and the housing 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0113] Figure 3 This is an exploded perspective view of a battery cell assembly according to one or more embodiments.

[0114] like Figure 3As shown, in the battery device 100, the battery cell assembly 20 includes multiple battery cells 1. The multiple battery cells 1 of the battery cell assembly 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells are connected in both series and parallel. The multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 1 is placed in the battery receiving cavity formed by the housing 102 and the cover 101. Of course, the battery device 100 can also be in the form of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, and housed in the battery receiving cavity formed by the housing 102 and the cover 101. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for realizing the electrical connection between the multiple battery cells.

[0115] Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments.

[0116] In some embodiments of this application, such as Figure 4 As shown, the battery cell 1 includes a housing 11 and an electrode assembly 12 disposed within the housing 11. The housing 11 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 11), or an aluminum-plastic film, etc.

[0117] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, it serves to protect the electrode assembly 12, and a sealing bag is included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 11 is a sealed structure, it is used to encapsulate the electrode assembly 12 and the electrolyte, among other components.

[0118] As an example, the battery cell 1 can be a cylindrical battery cell 1, a prismatic battery cell 1, a pouch battery cell 1, or a battery cell 1 of other shapes. The prismatic battery cell 1 includes a square battery cell 1, a blade-shaped battery cell 1, and a multi-prismatic battery, such as a hexagonal prismatic battery. This application does not have any particular limitations.

[0119] Electrode assembly 12 is the component in the battery where electrochemical reactions occur. The casing 11 may contain two or more electrode assemblies 12. Electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 12, while the portions of the positive and negative electrode sheets without active material each constitute tabs 121. Positive and negative tabs 121 may be located together at one end of the main body or separately at both ends of the main body. For example, the battery cell 1 also includes a terminal post 13, which is disposed in the casing 11 and connected to the tabs 121 of the electrode assembly 12. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 121 connect to the terminal post 13 to form a current loop.

[0120] In some embodiments of this application, such as Figure 4 As shown, the outer casing 11 includes an end cap 112 and a housing 111. The housing 111 has an opening, and the end cap 112 covers the opening of the housing 111. The two together form a receiving cavity, and the electrode assembly 12 is disposed in the receiving cavity.

[0121] End cap 112 refers to a component that covers the opening of housing 111 to isolate the internal environment of battery cell 1 from the external environment. The shape of end cap 112 can be adapted to the shape of housing 111 to fit it. Optionally, end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 112 is less prone to deformation under pressure and impact, enabling battery cell 1 to have higher structural strength and improved safety performance. Terminal post 13 is disposed on housing 11 and electrically connected to electrode assembly 12 for outputting or inputting electrical energy from battery cell 1.

[0122] For example, the end cap 112 may also be provided with a pressure relief mechanism 14 for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 112 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments of this application, an insulating member may also be provided on the inner side of the end cap 112. The insulating member can be used to isolate the electrical connection portion 231 within the housing 111 from the end cap 112 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0123] The housing 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 1. This internal environment can accommodate the electrode assembly 12, electrolyte, and other components. The housing 111 and the end cap 112 can be independent components. An opening can be provided on the housing 111, and the end cap 112 can be used to close the opening to form the internal environment of the battery cell 1. Alternatively, the end cap 112 and the housing 111 can be integrated. Specifically, the end cap 112 and the housing 111 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 111, the end cap 112 closes the housing 111. The housing 111 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the housing 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic. This application embodiment does not impose any special limitations on this.

[0124] In some embodiments of this application, openings are provided at opposite ends of the housing 111, and two end caps 112 are provided, which respectively cover the two openings to isolate the internal environment of the battery cell 1 from the external environment. At least one of a pressure relief mechanism 14 and a terminal post 13 may be provided on both end caps 112, or at least one of a pressure relief mechanism 14 and a terminal post 13 may be provided on one of the two end caps 112, or neither end cap 112 may have a pressure relief mechanism 14 or a terminal post 13 provided on either end cap.

[0125] For example, such as Figure 4 As shown, at least one electrode post 13 is provided on the outer casing 11, and the electrode post 13 is electrically connected to the electrode tab 121 of the electrode assembly 12. The electrode post 13 can be directly connected to the electrode tab 121, or it can be indirectly connected to the electrode tab 121 through an adapter. The electrode post 13 can be provided on the end cap 112 or on the casing 111.

[0126] Below, refer to Figures 5 to 15 Some embodiments of this application will be described in detail.

[0127] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction". The first direction X, the second direction Y, and the third direction Z intersect each other pairwise. In some embodiments, the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly.

[0128] Figure 5 This is a top view of a structure of a battery cell assembly according to one or more embodiments; Figure 6A top view of another structure of a battery cell assembly according to one or more embodiments; Figure 7 This is a perspective structural diagram of a portion of a battery device according to one or more embodiments, illustrating a first busbar, an insulating covering portion, and a second busbar; Figure 8 This is a three-dimensional structural schematic diagram of a first busbar and an insulating covering portion according to one or more embodiments; Figure 9 This is a top view of a first busbar and an insulating covering portion according to one or more embodiments; Figure 10 A three-dimensional structural schematic diagram of a first busbar according to one or more embodiments; Figure 11 This is a three-dimensional structural schematic diagram of the insulating covering portion according to one or more embodiments; Figure 12 This is a side view of a first busbar and an insulating covering according to one or more embodiments; Figure 13 A top view of a structure of a first bus according to one or more embodiments; Figure 14 To cover Figure 5 Top view of the insulating protective component of the medium structure; Figure 15 This is a top view of another structure of a first bus according to one or more embodiments.

[0129] The first aspect of this application provides a battery device 100, such as Figure 3 , Figures 5 to 9 As shown, the battery device 100 includes multiple battery cells 1, multiple busbars 2, and an insulating covering 3. The battery cells 1 are electrically connected to each other through the busbars 2. The multiple busbars 2 include a first busbar 2a, which is disposed on one side of the battery cell 1 along the first direction X. The first busbar 2a includes a first part 21, a second part 22, and a fuse part 23. The first part 21 and the second part 22 are respectively connected to the two ends of the fuse part 23 along the second direction Y. The first part 21 and the second part 22 are respectively electrically connected to two battery cells 1. The first direction X and the second direction Y intersect. The insulating covering 3 covers at least the surface of the fuse part 23 facing the battery cell 1 along the first direction X. A portion of the fuse part 23 is exposed from the side of it facing away from the battery cell 1 along the first direction X.

[0130] For example, such as Figure 4 As shown, the battery cell 1 includes a housing 11, an electrode assembly 12, and a terminal post 13. The housing 11 includes a shell 111 and an end cap 112. The shell 111 has an opening at one end along the first direction X, and the end cap 112 seals the opening. The electrode assembly 12 is disposed in the cavity formed by the shell 111 and the end cap 112. The terminal post 13 is disposed on the end cap 112 and connected to the tab 121 of the electrode assembly 12. A first busbar 2a is connected to the terminal posts 13 of two adjacent battery cells 1. The connection between the first busbar 2a and the terminal posts 13 can be welding or fasteners such as bolts.

[0131] For example, battery cells 1 can be connected in series or in parallel via busbars 2.

[0132] It is understandable that the fuse part 23 refers to the part of the first busbar 2a that is easier to melt than other parts. In the event of a short circuit or thermal runaway in the circuit where the first busbar 2a is located, the fuse part 23 of the first busbar 2a will melt, so that the first busbar 2a can be disconnected from the fuse part 23.

[0133] In the embodiments of this application, since the first busbar 2a has a fusible part 23 that is easy to melt, the fusible part 23 is equivalent to a fuse. In the event of a short circuit or thermal runaway of the battery cell 1, the fusible part 23 of the first busbar 2a will melt and disconnect the electrical connection between the battery cells 1, thereby breaking the conductive circuit, timely suppressing the spread of short circuit or thermal runaway, reducing the energy release of the battery cell 1, and reducing the risk of fire caused by excessive energy release. Furthermore, a portion of the fuse section 23 is exposed on the side facing away from the battery cell 1 along the first direction X. That is, the side of the fuse section 23 facing away from the battery cell 1 is not completely covered by the insulating covering part 3. The two ends of the fuse section 23 along the second direction Y are connected to the first part 21 and the second part 22 respectively. That is, the two sides of the fuse section 23 along the second direction Y are blocked by the first part 21 and the second part 22, making it difficult for the molten liquid of the fuse section 23 to splash from both sides along the second direction Y. Thus, after the fuse section 23 melts into molten liquid, it will splash out from the side facing away from the battery cell 1, reducing the diffusion of high-temperature molten liquid to the battery cell 1 side. This effectively reduces the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid to the battery cell 1, reduces the risk of fire, and by discharging the molten liquid, reduces the possibility of the molten liquid remaining in the original position and still in an electrically connected state, thereby improving the reliability of the fuse section 23 melting. In addition, since the fuse section 23 is formed from part of the first busbar 2a, no additional safety structure is required, and no additional space is needed, which improves the structural compactness of the battery device 100.

[0134] In some embodiments, such as Figure 7 and Figure 8 As shown, the cross-sectional area of ​​the first busbar 2a at the fusible portion 23 is smaller than the cross-sectional area of ​​the first busbar 2a at other parts, and the cross-section of the first busbar 2a is perpendicular to the second direction Y.

[0135] For example, the material of other parts of the first busbar 2a is the same as the material of the fuse part 23.

[0136] For example, the material of other parts of the first busbar 2a is different from the material of the fuse part 23.

[0137] For example, the material of the first busbar 2a includes, but is not limited to, copper, aluminum, or copper-aluminum composite materials.

[0138] Thus, the cross-sectional area of ​​the first busbar 2a at the fuse portion 23 is smaller than the cross-sectional area of ​​the first busbar 2a at other parts, making it most likely that the first busbar 2a will melt at the fuse portion 23. In the event of a short circuit or thermal runaway in a battery cell 1, the fuse portion 23 of the first busbar 2a will melt, breaking the electrical connection between the battery cells 1, thereby disconnecting the conductive circuit, controlling the short circuit or thermal runaway in time, reducing the energy release of the battery cell 1, and reducing the risk of fire caused by excessive energy release.

[0139] Of course, it is understood that the first busbar 2a is not limited to setting the cross-sectional area of ​​the fusible portion 23 to be smaller than the cross-sectional area of ​​other parts of the first busbar 2a. In some embodiments, the material of the fusible portion 23 of the first busbar 2a is different from the material of other parts of the first busbar 2a. The melting point of the material of the fusible portion 23 is lower than the melting point of the material of other parts of the first busbar 2a. The cross-sectional area of ​​the fusible portion 23 can be equal to or greater than the cross-sectional area of ​​other parts of the first busbar 2a, as long as the fusible portion 23 is easier to fuse than other parts.

[0140] In some embodiments, such as Figure 10 As shown, the first busbar 2a is provided with a perforated hole 24 and / or a notch 25 to form a fusible part 23.

[0141] For example, the busbar 2 is configured as a sheet-like structure with its thickness direction aligned with the first direction X.

[0142] For example, a notch 25 is provided on the first busbar 2a to narrow a portion of the first busbar 2a. The narrower portion formed after narrowing is the fusible portion 23, thereby making the cross-sectional area of ​​the first busbar 2a in the fusible portion 23 smaller than the cross-sectional area of ​​the first busbar 2a in other portions. The first busbar 2a may have notches 25 at both ends along the third direction Z; or the first busbar 2a may have a notch 25 at only one end along the third direction Z.

[0143] For example, a perforated hole 24 is provided on the first busbar 2a. The solid portion of the first busbar 2a corresponding to the perforated hole 24 in the third direction Z is the fused portion 23. Due to the perforated hole 24, the cross-sectional area of ​​the first busbar 2a in the fused portion 23 is smaller than the cross-sectional area of ​​the first busbar 2a in other parts. The first busbar 2a may have only one perforated hole 24, or it may have multiple perforated holes 24 in the third direction Z.

[0144] For example, the first busbar 2a is provided with a notch 25 and a hollow hole 24. The notch 25 can be provided with one or two, and the hollow hole 24 can be provided with one or more. Due to the provision of the notch 25 and the hollow hole 24, the cross-sectional area of ​​the first busbar 2a in the fused part 23 is smaller than the cross-sectional area of ​​the first busbar 2a in other parts.

[0145] Thus, by providing a perforated hole 24 and / or a notch 25 on the first busbar 2a, the cross-sectional area of ​​the first busbar 2a at the fuse portion 23 is smaller than the cross-sectional area of ​​the first busbar 2a in other parts, making it easier for the first busbar 2a to melt at the fuse portion 23. In the event of a short circuit or thermal runaway in a battery cell 1, the fuse portion 23 on the first busbar 2a will melt, breaking the electrical connection between the battery cells 1, thereby disconnecting the conductive circuit, controlling the short circuit or thermal runaway in time, reducing the energy release of the battery cell 1, and reducing the risk of fire caused by excessive energy release.

[0146] Of course, it is understood that the first busbar 2a is not limited to providing a perforated hole 24 or a notch 25 to form a fusible portion 23. In some embodiments, the first busbar 2a is partially thinned to form a fusible portion 23.

[0147] In some embodiments, such as Figures 8 to 10 As shown, the first busbar 2a includes a first part 21 and a second part 22. The first part 21 and the second part 22 are respectively connected to the two ends of the fuse part 23 along the second direction Y. The first part 21 and the second part 22 are respectively electrically connected to two battery cells 1. The first direction X, the second direction Y and the third direction Z intersect each other. The insulating covering part 3 also covers the two opposite surfaces of the fuse part 23 along the third direction Z.

[0148] For example, the ends of the first part 21 and the second part 22 facing each other along the second direction Y are respectively connected to the two ends of the fuse part 23 along the second direction Y.

[0149] For example, multiple battery cells 1 are arranged along the second direction Y, and the terminals 13 of any two adjacent battery cells 1 along the second direction Y are connected in series through a busbar 2. The terminals 13 of the two adjacent battery cells 1 are respectively connected to the first part 21 and the second part 22 of the first busbar 2a.

[0150] For example, both the first part 21 and the second part 22 are formed with positioning holes or positioning posts, and the battery cell 1 is formed with positioning posts or positioning holes. In this way, the positioning of the first part 21 and the second part 22 on the battery cell 1 is achieved through the cooperation of the positioning holes and positioning posts, thereby improving the accuracy of assembly.

[0151] Thus, the two ends of the fuse section 23 along the second direction Y are connected to the first part 21 and the second part 22 respectively. That is, the fuse section 23 is shielded by the first part 21 and the second part 22 on both sides along the second direction Y, so that the molten liquid of the fuse section 23 is not easy to splash to both sides along the second direction Y. Furthermore, the insulating covering part 3 covers the fuse section 23 on the opposite sides along the third direction Z, so that the molten liquid of the fuse section 23 is not easy to splash from both sides along the third direction Z. Thus, the fuse section 23 is shielded in multiple directions, so that most of the molten liquid of the fuse section 23 splashes out to the side away from the battery cell 1 along the first direction X, thereby further reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid to the battery cell 1 and reducing the risk of fire.

[0152] Of course, it is understood that the two surfaces of the fuse portion 23 opposite each other in the third direction Z are not limited to being covered by the insulating covering portion 3. In some embodiments, one of the two surfaces of the fuse portion 23 opposite each other in the third direction Z is covered by the insulating covering portion 3, while the other is not covered by the insulating covering portion 3. In some embodiments, neither of the two surfaces of the fuse portion 23 opposite each other in the third direction Z is covered by the insulating covering portion 3.

[0153] In some embodiments, such as Figures 8 to 11 As shown, the insulating covering part 3 also covers the part of the surface of the fuse part 23 facing away from the battery cell 1 along the first direction X. The insulating covering part 3 has a first outlet on the side facing away from the battery cell 1 along the first direction X, and part of the fuse part 23 is exposed through the first outlet.

[0154] Thus, the insulating covering part 3 also covers the part of the fuse part 23 facing away from the battery cell 1 along the first direction X, and forms a first outlet. The area of ​​the first outlet is set to be relatively small, which is conducive to the accumulation of molten liquid in the fuse part 23, and then splashes outward through the first outlet. This helps to suppress the splashing area of ​​molten liquid, further reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid, and reducing the risk of fire.

[0155] Of course, it is understandable that the surface of the fuse portion 23 facing away from the battery cell 1 along the first direction X is not limited to being covered by the insulating covering portion 3. In some embodiments, the surface of the fuse portion 23 facing away from the battery cell 1 along the first direction X is not covered by the insulating covering portion 3.

[0156] In some embodiments, such as Figure 10 As shown, the fuse portion 23 is configured as a bent structure, and a portion of the fuse portion 23 is recessed toward the battery cell 1 relative to the first portion 21 and the second portion 22.

[0157] It is understandable that "the portion of the fuse 23 is recessed relative to the first portion 21 and the second portion 22 toward the battery cell 1" means that the portion of the fuse 23 is deformed and recessed relative to the first portion 21 and the second portion 22 toward the battery cell 1, forming a recess on the side away from the battery cell 1 and a protrusion on the side facing the battery cell 1, with the protrusion being closer to the battery cell 1 than the first portion 21 and the second portion 22.

[0158] In this way, the first busbar 2a can be stretched or shortened to a certain extent in the second direction Y to accommodate the changes in the spacing of the terminals 13 of adjacent battery cells 1 caused by the thermal expansion of multiple battery cells 1, thereby maintaining a reliable connection between the first busbar 2a and the battery cells 1 and reducing the risk of open circuit. Furthermore, the portion of the fuse 23 is recessed relative to the first portion 21 and the second portion 22 towards the battery cell 1. This allows the molten liquid in the fuse 23 to be blocked by the first portion 21 and the second portion 22 during the splashing along the first direction X towards the side away from the battery cell 1, further promoting directional splashing of the molten liquid and reducing the diffusion of high-temperature molten liquid towards the battery cell 1. This effectively reduces the risk of secondary short circuits or thermal runaway caused by the diffusion of molten liquid towards the battery cell 1, and reduces the risk of fire.

[0159] Of course, it is understood that the fuse portion 23 is not limited to being configured as a bent structure; in some embodiments, the fuse portion 23 is configured as a straight structure. The fuse portion 23 is not limited to being recessed relative to the first portion 21 and the second portion 22 toward the battery cell 1 side; in some embodiments, the fuse portion 23 is recessed relative to the first portion 21 and the second portion 22 toward the side away from the battery cell 1 side.

[0160] In some embodiments, such as Figure 11 and Figure 12 As shown, a portion of the insulating covering part 3 is recessed relative to the first part 21 and the second part 22 toward the battery cell 1 to form a groove 30. The bottom wall 31 of the groove 30 has an embedding groove 311. The embedding groove 311 has a first outlet on the inner surface of the bottom wall 31. A portion of the fusible part 23 is embedded in the side wall 32 of the groove 30, and another portion is embedded in the embedding groove 311 and exposed through the first outlet.

[0161] It is understandable that the inner surface of the groove bottom wall 31 is the surface of the groove bottom wall 31 facing the groove 30.

[0162] For example, the surface of the fuse section 23 exposed through the first outlet is flush with the inner surface of the bottom wall 31 of the tank.

[0163] For example, the surface of the fuse portion 23 exposed through the first outlet is located within the groove 30, that is, the surface of the fuse portion 23 exposed through the first outlet is lower than the inner surface of the groove bottom wall 31.

[0164] For example, the surfaces of the fuse portion 23 embedded in the groove sidewall 32 of the groove 30 are all covered by the groove sidewall 32.

[0165] For example, the bottom wall 31 of the groove 30 is connected to a side wall 32 at each end along the second direction Y. The side wall 32 and the bottom wall 31 can be set to be perpendicular to each other. The included angle between the side wall 32 and the bottom wall 31 can be set to an obtuse angle, and the included angle between the side wall 32 and the bottom wall 31 can be set to an acute angle.

[0166] Thus, the first outlet for the molten liquid to splash out is set on the inner surface of the bottom wall 31 of the groove 30, so that the molten liquid splashed out from the first outlet is blocked by the side wall 32 of the groove, which further promotes the directional splashing out of the molten liquid, reduces the diffusion of high temperature molten liquid to the battery cell 1, thereby effectively reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid to the battery cell 1, and reducing the risk of fire.

[0167] Of course, it is understood that the insulating covering portion 3 is not limited to forming a groove 30. In some embodiments, the insulating covering portion 3 is configured as a straight structure.

[0168] In some embodiments, such as Figure 10 As shown, the fuse section 23 includes a plurality of connecting sections 231, which are connected between the first section 21 and the second section 22 and are arranged at intervals along the third direction Z.

[0169] For example, three connecting parts 231 are provided, and each connecting part 231 is a long strip structure with its extension direction perpendicular to the third direction Z.

[0170] It is understandable that the sum of the cross-sectional areas of all the connecting parts 231 is equal to the cross-sectional area of ​​the fuse part 23.

[0171] Thus, by connecting multiple spaced connecting portions 231 between the first portion 21 and the second portion 22, the cross-sectional area of ​​the first busbar 2a at the fuse portion 23 is smaller than the cross-sectional area of ​​the first busbar 2a in other portions, making it easier for the first busbar 2a to melt at the fuse portion 23. In the event of a short circuit or thermal runaway in a battery cell 1, the fuse portion 23 on the first busbar 2a will melt, breaking the electrical connection between the battery cells 1, thereby disconnecting the conductive circuit, controlling the short circuit or thermal runaway in time, reducing the energy release of the battery cell 1, and reducing the risk of fire caused by excessive energy release.

[0172] In some embodiments, such as Figure 9 and Figure 10As shown, a perforated hole 24 is formed between adjacent connecting portions 231 along the third direction Z, and part of the insulating covering portion 3 fills the perforated hole 24; and / or, a gap 25 is formed between the connecting portion 231 located at the edge along the third direction Z and the first portion 21 and the second portion 22, and part of the insulating covering portion 3 fills the gap 25.

[0173] For example, such as Figure 10 As shown, three connecting portions 231 are provided. Each connecting portion 231 is a long strip-shaped structure extending perpendicular to the third direction Z. A perforation 24 is formed between adjacent connecting portions 231, resulting in a total of two perforations 24. Counting along the third direction Z, the first connecting portion 231 forms a notch 25 between itself and the first portion 21 and the second portion 22 on the side facing away from the second connecting portion 231. The last connecting portion 231 forms another notch 25 between itself and the first portion 21 and the second portion 22 on the side facing away from the second connecting portion 231.

[0174] For example, part of the insulating covering part 3 fills the hollow hole 24 and contacts the surfaces of the connecting part 231, the first part 21 and the second part 22 facing the hollow hole 24.

[0175] For example, a portion of the insulating covering portion 3 fills the notch 25 and contacts the surfaces of the connecting portion 231, the first portion 21, and the second portion 22 facing the notch 25.

[0176] In this way, the insulating covering part 3 can more comprehensively cover each connecting part 231 of the fuse part 23, allowing the molten liquid from each connecting part 231 to splash along the first direction X towards the side opposite to the battery cell 1. This improves the certainty of the splash direction and reduces the diffusion of high-temperature molten liquid towards the battery cell 1, thereby effectively reducing the risk of secondary short circuits or thermal runaway caused by the diffusion of molten liquid into the battery cell 1, and reducing the risk of fire. Furthermore, by discharging the molten liquid, the possibility of the molten liquid remaining in its original position and still in an electrically connected state is reduced, thereby improving the reliability of the fuse part 23 in fusing.

[0177] Of course, it is understood that in some other embodiments, the hollow hole 24 or notch 25 formed by the connecting part 231 may not be filled with the insulating covering part 3.

[0178] In some embodiments, such as Figure 10As shown, the connecting portion 231 includes a first sub-portion 2311, a second sub-portion 2312, and a third sub-portion 2313 that are connected in a cross manner. One end of the first sub-portion 2311 is connected to the surface of the first portion 21 facing the second portion 22, and the other end is inclined toward the battery cell 1 and connected to one end of the second sub-portion 2312. One end of the third sub-portion 2313 is connected to the surface of the second portion 22 facing the first portion 21, and the other end is inclined toward the battery cell 1 and connected to the other end of the second sub-portion 2312. The insulating covering portion 3 covers the surfaces of the first sub-portion 2311 and the third sub-portion 2313 that are away from the battery cell 1, while the surface of the second sub-portion 2312 that is away from the battery cell 1 is exposed.

[0179] For example, the first sub-part 2311 is embedded in one groove sidewall 32 of the groove 30 of the insulating covering part 3, the third sub-part 2313 is embedded in another groove sidewall 32 of the groove 30 of the insulating covering part 3, and the second sub-part 2312 is embedded in the embedding groove 311 of the groove bottom wall 31.

[0180] For example, the angle between the first sub-part 2311 and the second sub-part 2312 is set to an obtuse angle. The angle between the third sub-part 2313 and the second sub-part 2312 is also set to an obtuse angle.

[0181] For example, the angle between the first sub-part 2311 and the second sub-part 2312 is the same as the angle between the third sub-part 2313 and the second sub-part 2312.

[0182] For example, the included angle between the first sub-part 2311 and the second sub-part 2312 is set to an acute angle or they are perpendicular to each other. The included angle between the third sub-part 2313 and the second sub-part 2312 is set to an acute angle or they are perpendicular to each other.

[0183] Thus, the connecting portion 231 is formed as a bent structure protruding towards the battery cell 1, and the part of the connecting portion 231 facing away from the battery cell 1 is covered by the insulating covering portion 3, while the remaining part is exposed through the first outlet. This makes the area of ​​the first outlet relatively small, which is conducive to the accumulation of molten liquid in the fuse portion 23, and then splashing outward through the first outlet. This helps to suppress the splashing area of ​​the molten liquid, further reducing the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid, and reducing the risk of fire.

[0184] Of course, it is understood that the connecting portion 231 is not limited to being composed of three parts: the first sub-part 2311, the second sub-part 2312, and the third sub-part 2313. In some embodiments, the connecting portion 231 can be a straight structure. In some embodiments, the connecting portion 231 can be formed by four or more sub-parts connected in a cross manner.

[0185] In some embodiments, such as Figure 13As shown, the portion of the first part 21 that overlaps with the second part 22 along the second direction Y has a dimension of L1 in the third direction Z, and the arrangement area of ​​all connecting parts 231 has a dimension of L2 in the third direction Z. The value of L2 / L1 is greater than or equal to 30% and less than or equal to 70%.

[0186] It is understandable that the dimension L2 of the arrangement area of ​​all connecting parts 231 in the third direction Z is equal to the sum of the dimensions of all connecting parts 231 in the third direction Z and the gaps between adjacent connecting parts 231 in the third direction Z. In other words, with Figure 13 Taking the orientation shown as an example, the distance between the left edge of the leftmost connecting part 231 and the right edge of the rightmost connecting part 231 in the third direction Z is the dimension L2.

[0187] For example, there may be one, two, three, four or more connecting parts 231 arranged along the third direction Z.

[0188] For example, the value of L2 / L1 can be, but is not limited to, 30%, 40%, 50%, 60%, or 70%.

[0189] This arrangement allows for a relatively concentrated distribution of all connection parts 231, resulting in a smaller spacing between adjacent connection parts 231. This leads to a smaller time difference in the melting of adjacent connection parts 231, ensuring that all connection parts 231 can melt promptly in the event of a short circuit or thermal runaway in a single battery cell 1. This disconnects the electrical connection between battery cells 1, breaking the conductive circuit and effectively suppressing the spread of short circuits or thermal runaway. It also reduces the energy release of the battery cells 1 and lowers the risk of fire due to excessive energy release. Furthermore, the arrangement area is sufficient for the distribution of all connection parts 231, and the spacing between adjacent connection parts 231 is adequate, reducing the possibility of electrical continuity between adjacent connection parts 231.

[0190] Of course, it is understood that the value of L2 / L1 is not limited to greater than or equal to 30% and less than or equal to 70%. In some embodiments, the value of L2 / L1 can be less than 30% or greater than 70%.

[0191] In some embodiments, the cross-sectional area of ​​each connecting portion 231 is the same.

[0192] Thus, by setting the cross-sectional area of ​​each connection 231 to be the same, it is beneficial to reduce the melting time difference of each connection 231. In the event of a short circuit or thermal runaway in the battery cell 1, all connections 231 can melt in time, disconnecting the electrical connection between the battery cells 1, thereby breaking the conductive circuit, suppressing the spread of short circuit or thermal runaway in time, reducing the energy release of the battery cell 1, and reducing the risk of fire caused by excessive energy release.

[0193] Of course, it is understood that the cross-sectional areas of each connecting portion 231 are not limited to the same. In some embodiments, a portion of the connecting portions 231 have the same cross-sectional area, while the rest are different. In some embodiments, the cross-sectional areas of all connecting portions 231 are different.

[0194] In some embodiments, such as Figure 13 As shown, the first part 21 has a first positioning hole 211 and is connected to a terminal post 13 of a battery cell 1. The first positioning hole 211 and the terminal post 13 share a central axis. The second part 22 has a second positioning hole 221 and is connected to a terminal post 13 of another battery cell 1. The second positioning hole 221 and the terminal post 13 share a central axis. Along the third direction Z, the first and last connecting parts 231 are symmetrically arranged about the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221.

[0195] For example, for the sake of illustration, Figure 13 The dashed line in the diagram illustrates the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221. Figure 13 Taking the orientation shown as an example, the line connecting the leftmost connecting part 231 and the rightmost connecting part 231 with respect to the center of the first positioning hole 211 and the center of the second positioning hole 221 (as shown in the figure) Figure 13 (The dashed line in the middle) is set symmetrically.

[0196] For example, there are an odd number of connecting portions 231. The connecting portion 231 located in the middle can be symmetrical about the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221, or it can be asymmetrical.

[0197] For example, there are an even number of connecting portions 231. The two connecting portions 231 located in the middle can be symmetrical about the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221, or they can be asymmetrical.

[0198] This configuration ensures that the lines connecting the first and last connection portions 231 to the center of the first positioning hole 211 and the center of the second positioning hole 221 are the same, and that the distances between the first and last connection portions 231 and the two terminals 13 are essentially the same. This results in similar current flows through the first and last connection portions 231, which helps reduce the time difference between the melting points 231. In the event of a short circuit or thermal runaway in a battery cell 1, the connection portions 231 can melt in time, disconnecting the electrical connection between the battery cells 1, thereby breaking the conductive circuit, suppressing the spread of short circuit or thermal runaway in time, reducing the energy release of the battery cell 1, and lowering the risk of fire caused by excessive energy release.

[0199] Of course, it is understandable that the first and last connecting portions 231 are not limited to being symmetrically arranged about the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221 along the third direction Z. In some embodiments, the line connecting the first and last connecting portions 231 to the center of the first positioning hole 211 and the center of the second positioning hole 221 along the third direction Z is different.

[0200] In some embodiments, such as Figure 13 As shown, the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221 is located in the second direction Y. The length of the line connecting the center of the first positioning hole 211 and the center of the second positioning hole 221 is L3. The dimension of the connecting part 231 along the second direction Y is L4. The value of L3 / L4 is equal to 2.

[0201] For example, the size of L3 is 30mm and the size of L4 is 15mm.

[0202] In this way, the dimension of the connecting part 231 along the second direction Y is adapted to the length of the circuit conduction path between adjacent battery cells 1, so that the connecting part 231 melts when the battery cell 1 malfunctions, and will not melt within the normal temperature range due to the large size of the connecting part 231, thereby improving the reliability of the melt-breaking part 23.

[0203] Of course, it is understood that the value of L3 / L4 is not limited to 2. In some embodiments, the value of L3 / L4 is less than 2 or greater than 2. For example, the value of L3 / L4 can be, but is not limited to, 1.5, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, etc.

[0204] In some embodiments, the first busbar 2a is a one-piece molded part.

[0205] For example, the first busbar 2a includes a first part 21, a second part 22 and a fuse part 23 connected between the first part 21 and the second part 22, and the first part 21, the second part 22 and the fuse part 23 are formed as an integral part.

[0206] In this way, the fusible part 23 is integrally formed with the other parts of the first busbar 2a, without the need for additional assembly or welding, which reduces the complexity of the manufacturing process and the defect rate.

[0207] Of course, it is understood that the first busbar 2a is not limited to being a one-piece molded part. In some embodiments, the first busbar 2a includes a first part 21, a second part 22 and a fusion-break part 23 connected between the first part 21 and the second part 22. The fusion-break part 23 can be connected to the first part 21 and the second part 22 by welding.

[0208] In some embodiments, such as Figure 7 As shown, the battery device 100 also includes a sampling component 7. The sampling component 7 and the first busbar 2a are located on the same side of the battery cell 1 along the first direction X. One end of the first part 21 along the third direction Z extends beyond the second part 22 and is connected to the sampling component 7. The first direction X, the second direction Y and the third direction Z intersect each other.

[0209] For example, the sampling component 7 includes a flexible circuit board 71, a rigid circuit board, or wires. The first portion 21 of the first bus 2a is electrically connected to the flexible circuit board 71.

[0210] Thus, by setting the first part 21 to be relatively long along the third direction Z, the first part 21 is close to the sampling component 7, which facilitates the electrical connection between the first part 21 and the sampling component 7, thereby enabling sampling of the first busbar 2a.

[0211] In some embodiments, such as Figure 7 and Figure 8 As shown, the portion of the first part 21 extending beyond the second part 22 along the third direction Z has a recessed region 212 formed on the surface of the battery cell 1 facing away from it. The battery device 100 also includes an electrical connector 8, a portion of which is disposed in the recessed region 212 and connected to the surface of the recessed region 212. The electrical connector 8 is connected to the flexible circuit board 71.

[0212] For example, the electrical connector 8 can be, but is not limited to, a nickel sheet, a copper sheet, an aluminum sheet, or a nickel-plated steel sheet.

[0213] For example, the electrical connector 8 is welded to the recessed area 212 of the first part 21.

[0214] For example, the thickness of a portion of the first part 21 is reduced to form a recessed region 212.

[0215] For example, the electrical connector 8 extends beyond the recessed region 212 along the first direction X.

[0216] For example, the electrical connector 8 does not extend beyond the recessed area 212 along the first direction X.

[0217] Thus, by forming a recessed region 212 in the first part 21 and connecting the electrical connector 8 to the recessed region 212, the extent to which the electrical connector 8 extends beyond the surface of the first part 21 away from the battery cell 1 is reduced, thereby reducing the space occupied in the first direction X and improving the volumetric energy density of the battery device 100.

[0218] In some embodiments, the insulating covering portion 3 is injection molded onto the surface of the fusible portion 23.

[0219] Thus, by forming an insulating covering 3 on the surface of the fusible part 23 through injection molding, the connection strength between the insulating covering 3 and the fusible part 23 can be improved, the reliability of the insulating covering 3 covering the fusible part 23 can be improved, and the possibility of the two separating under non-short circuit conditions can be reduced.

[0220] Of course, it is understood that the insulating covering 3 is not limited to being formed on the surface of the fusible portion 23 by injection molding. In some embodiments, the insulating covering 3 can be bonded to the surface of the fusible portion 23 by an adhesive. In some embodiments, the insulating covering 3 may only cover the surface of the fusible portion 23, and the two are not connected.

[0221] In some embodiments, the material of the insulating covering 3 includes at least one of plastic, rubber and silicone.

[0222] For example, the material of the insulating covering part 3 is plastic, such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polystyrene (PS).

[0223] In this way, the insulating covering part 3 can be stably covered on the surface of the fuse part 23. During the process of the fuse part 23 melting and breaking the conductivity, the insulating covering part 3 can play a blocking role, thereby realizing the directional splashing of the molten liquid, which effectively reduces the risk of secondary short circuit or thermal runaway caused by the diffusion of molten liquid to the battery cell 1, and reduces the risk of fire.

[0224] Of course, it is understood that the material of the insulating covering part 3 is not limited to plastic, rubber and silicone. In some other embodiments, the material of the insulating covering part 3 can also be mica, ceramic, glass and the like.

[0225] In some embodiments, such as Figure 5 and Figure 6 As shown, at least a portion of multiple battery cells 1 are arranged sequentially along the second direction Y, which intersects with the first direction X. Adjacent battery cells 1 along the second direction Y are connected in series or in parallel through a busbar 2. The battery device 100 also includes an end plate 5. An end plate 5 is provided on each side of the multiple battery cells 1 along the second direction Y. Adjacent battery cells 1 along the second direction Y are connected in series or in parallel through a busbar 2. At least one of all the busbars 2 that are farthest from the two end plates 5 along the second direction Y is the first busbar 2a.

[0226] It is understandable that the busbar 2 furthest from the two end plates 5 along the second direction Y may be one or two. For example... Figure 5As shown, in the same column of battery cells 1 arranged along the second direction Y, if the number of battery cells 1 is even, then the two battery cells 1 located in the middle of the column are connected by a busbar 2. This busbar 2 is the furthest from the two end plates 5, and this busbar 2 is the first busbar 2a. Figure 6 As shown, if the number of battery cells 1 in the same column arranged along the second direction Y is odd, then the battery cell 1 located in the middle of the column is connected to its two adjacent battery cells 1 through a busbar 2. The two busbars 2 are the farthest from the two end plates 5. One or both of the two busbars 2 are the first busbar 2a.

[0227] It is understandable that at least one of all the busbars 2 that are furthest from the two end plates 5 along the second direction Y is the first busbar 2a, and the busbars 2 located at other positions can be the first busbar 2a or the second busbar 2b that does not have the fuse part 23.

[0228] For example, the outer surfaces of the two shell walls of the outer casing 11 of the battery cell 1 opposite each other along the second direction Y have the largest area. That is, the two shell walls of the outer casing 11 of the battery cell 1 opposite each other along the second direction Y are the large surfaces of the outer casing 11. Multiple battery cells 1 are arranged along the second direction Y and disposed between the two end plates 5.

[0229] For example, such as Figure 3 As shown, the battery device 100 includes two end plates 5 and two side plates 6. The two end plates 5 are arranged at intervals along the second direction Y. The two side plates 6 are respectively connected to the two ends of the end plates 5 along the third direction Z. The two side plates 6 are connected to both end plates 5. The two end plates 5 and the two side plates 6 are connected to form a square frame structure. Multiple battery cells 1 are arranged in the space enclosed by the square frame structure. The multiple battery cells 1 are arranged in multiple columns along the third direction Z, and each column includes multiple battery cells 1 arranged along the second direction Y.

[0230] During the thermal expansion of multiple battery cells 1, the displacement of battery cells 1 closer to the end plate 5 along the second direction Y is greater, while the displacement of battery cells 1 farther away from the end plate 5 is smaller. Therefore, by placing the first busbar 2a in the middle position, the displacement at this position is smaller during thermal expansion, which helps to reduce the possibility of the fuse portion 23 of the first busbar 2a being broken due to the displacement of the battery cells 1, thereby improving the structural reliability of the first busbar 2a and enabling the first busbar 2a to perform its fuse protection function.

[0231] Of course, it is understood that the first busbar 2a is not limited to being located at the middle position in the second direction Y. In some embodiments, the first busbar 2a may be located at other positions that are off-center from the middle position in the second direction Y.

[0232] In some embodiments, such as Figure 14 As shown, the battery device 100 also includes an insulating protective member 4, which at least covers the side of the busbar 2 and the insulating covering portion 3 facing away from the battery cell 1 along the first direction X. The insulating protective member 4 has a weak portion 43 that is projected into the same projection plane along the first direction X. The projection of at least one fuse portion 23 exposed on its side facing away from the battery cell 1 along the first direction X overlaps with the projection of the weak portion 43.

[0233] It is understandable that the weak part 43 is a part of the insulating protective component 4 that is easier to break than other parts. After the melting part 23 melts, it splashes away from the battery cell 1 in the first direction X. The splashed molten liquid impacts the weak part 43, causing the weak part 43 to break, so that the molten liquid can be smoothly discharged to the outside of the insulating protective component 4.

[0234] For example, the battery device 100 includes one or more (more than two) first busbars 2a projected into the same projection plane along a first direction X. The projection of the portion of the fuse 23 of at least one first busbar 2a exposed on its side facing away from the battery cell 1 along the first direction X overlaps with the projection of the weak portion 43. That is, at least one fuse 23 of the first busbar 2a corresponds to a weak portion 43. In other words, all fuse 23s may each correspond to a weak portion 43, some fuse 23s may each correspond to a weak portion 43, or at least two of all fuse 23s may correspond to the same weak portion 43.

[0235] For example, the battery device 100 includes a plurality of (two or more) first busbars 2a projected into the same projection plane along the first direction X. The projection of the fuse portion 23 of a portion of the first busbars 2a exposed on the side opposite to the battery cell 1 along the first direction X overlaps with the projection of the weak portion 43. The remaining portions of the fuse portion 23 of the first busbars 2a exposed on the side opposite to the battery cell 1 along the first direction X are covered by the insulating protective member 4.

[0236] For example, when projected along the first direction X into the same projection plane, the projection of the portion of the fuse 23 exposed on the side opposite to the battery cell 1 along the first direction X falls entirely within the projection range of the weak portion 43.

[0237] For example, when projected into the same projection plane along the first direction X, a portion of the projection of the exposed part of the fuse portion 23 on the side opposite to the battery cell 1 along the first direction X falls into the projection range of the weak portion 43, while the remaining portion extends beyond the projection boundary of the weak portion 43.

[0238] For example, the insulating protective component 4 is an insulating film, which is made of plastic, such as polycarbonate (PC), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0239] For example, the insulating protective member 4 covers the surface of the busbar 2 and the insulating covering part 3 facing away from the battery cell 1, and covers the outer surface of the battery cell 1.

[0240] For example, the insulating protective member 4 fully covers multiple battery cells 1 from the side of the battery cell 1 where the busbar 2 is located.

[0241] For example, the insulating protective member 4 covers a portion of a plurality of battery cells 1 from the side of the battery cell 1 where the busbar 2 is located.

[0242] For example, when projected along the first direction X into the same projection plane, the projection of the first outlet of the insulating covering portion 3 overlaps with the projection of the weak portion 43. The fusible portion 23 is exposed through the first outlet. Therefore, by defining the projection relationship between the first outlet and the weak portion 43, the exposed portion of the fusible portion 23 can overlap with the projection of the weak portion 43.

[0243] For example, when projected along the first direction X into the same projection plane, the projection of the first outlet of the insulating covering part 3 falls entirely within the projection range of the weak part 43.

[0244] The insulating protective element 4, located on the side of the busbar 2 facing away from the battery cell 1, primarily provides electrical insulation protection, reducing the probability of a short circuit caused by accidental contact between the busbar 2 and the battery box 10 or other conductive components. It also provides a certain degree of mechanical protection. Furthermore, a weak point 43 is formed on the insulating protective element 4. Under normal circumstances, the weak point 43 remains intact, maintaining the insulation performance and dustproof sealing level of the battery device 100. In the event of a short circuit, controlled rupture is preferentially achieved at the weak point 43, thereby rapidly releasing the high-temperature molten material splashed from the insulating cover 3 and the heat accumulated inside, reducing the risk of fire caused by a rapid increase in local temperature.

[0245] In some embodiments, such as Figure 14 As shown, the insulating protective component 4 includes an insulating body 41 and a cover 42. The insulating body 41 has a second outlet, and the cover 42 covers the second outlet. The edge of the cover 42 is connected to the surface of the insulating body 41 facing away from the battery cell 1. The part of the cover 42 corresponding to the second outlet is a weak part 43.

[0246] It should be noted that, Figure 14 The dashed line in the diagram represents the boundary of the second exit, and the part of the cover 42 surrounded by the dashed line is the weak part 43.

[0247] For example, the edge of the cover 42 is bonded to the surface of the insulating body 41 facing away from the battery cell 1 by an adhesive.

[0248] For example, the edge of the cover 42 is connected to the surface of the insulating body 41 facing away from the battery cell 1 by heat fusion.

[0249] For example, the insulating body 41 and the cover 42 may be made of the same material or different materials.

[0250] For example, when projected along the first direction X onto the same projection plane, the projection of the first exit falls entirely within the projection range of the second exit.

[0251] Thus, when the splashed molten liquid impacts the cover 42, the impact force on the cover 42 can peel the cover 42 from the insulating body 41, thereby opening the second outlet. The second outlet is used to discharge the molten liquid and heat, thereby quickly releasing the high-temperature molten material splashed from the insulating cover 3 and the heat accumulated inside, reducing structural damage or chain reactions caused by a sharp increase in local temperature.

[0252] In some embodiments, the insulating protective member 4 is an integral structure, and in the first direction X, the size of the weak part 43 is smaller than the size of the other parts of the insulating protective member 4.

[0253] For example, the insulating protective element 4 is an insulating film, and the thickness of the weak part 43 is less than the thickness of the other parts of the insulating protective element 4.

[0254] In this way, by making the weak part 43 thinner than other parts, the weak part 43 is easy to break. After breaking, a through hole is formed to allow the molten liquid and heat to be discharged, thereby quickly releasing the high-temperature molten material splashed from the insulating covering part 3 and the heat accumulated inside, reducing the structural damage or chain reaction caused by a sharp increase in local temperature.

[0255] The second aspect of this application provides an electrical device, which includes the battery device 100 provided in the first aspect, the battery device 100 being used to store or provide electrical energy.

[0256] Since the electrical device includes a battery device 100, and has all the beneficial effects of the battery device 100, the electrical device can reduce the risk of fire in the event of a short circuit or thermal runaway.

[0257] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0258] As a specific example, a battery device 100 is provided, comprising multiple battery cells (cells 1), multiple aluminum busbars (current collectors 2), and a plastic structure (insulating covering 3). The battery cells are connected in series via aluminum busbars. One of the aluminum busbars (first current collector 2a) has a perforated structure (perforated holes 24 and notches 25), while the remaining aluminum busbars (second current collectors 2b) do not have perforated structures. The perforated portion of the aluminum busbar is covered by the plastic structure, which wraps around the aluminum busbar from the bottom, while the upper part of the structure is exposed and not shielded. This not only effectively meets the stringent standards for external short-circuit testing and significantly improves the safety performance of the battery device 100 under extreme conditions, but also achieves multi-dimensional optimization.

[0259] Firstly, the hollow structure effectively reduces the risk of accidents caused by external short circuits during transportation and warehousing. It also eliminates the need for additional external safety devices, significantly reducing the number of components used and lowering material procurement costs and assembly complexity. Furthermore, the design prioritizes space utilization; the hollow structure does not increase the overall volume or thickness of the battery module (cell assembly 20). Instead, it optimizes internal space allocation through rational arrangement, further saving on transportation packaging space and logistics costs, and improving overall package transportation efficiency. Moreover, the plastic structure and aluminum core are integrated through a single injection molding process, improving both structural precision and stability while achieving dual optimization of function and space. During melting, the plastic structure precisely guides the flow of molten metal, reducing its diffusion inwards and effectively minimizing the risk of secondary short circuits or thermal runaway. Since this structure requires no additional assembly or welding and is fully embedded within the original structure, it does not occupy additional internal space, significantly improving overall structural compactness and reliability. Simultaneously, it reduces manufacturing complexity and defect rates, enhancing product applicability and long-term stability.

[0260] The battery device 100 also includes a top insulation structure (insulation protection 4) covering the side of the aluminum bar facing away from the battery cell. The corresponding perforated areas of the top insulation structure are directionally weakened (forming weak points 43), achieving a balance between thermal management and safety protection. This weakening design, while maintaining the original insulation performance and dustproof sealing level of the battery device 100, allows for controlled rupture at the weak point (weak point 43) in the event of a short circuit fault. This rapidly releases the high-temperature molten material and internally accumulated heat, reducing structural damage or chain reactions caused by a sharp increase in local temperature. Thus, it significantly improves the battery device 100's tolerance and pass rate in external short-circuit tests, making the test results more repeatable and stable.

[0261] Aluminum bar fusing tests were performed on first busbar 2a with three molten elements (connecting parts 231) and first busbar 2a with four molten elements (connecting parts 231) to detect the fusing time of each molten element (connecting part 231) and to calculate the maximum fusing time difference between the molten elements. The test conditions were: room temperature current of 7000A, ambient temperature and initial cell temperature of 57°C, initial cell charge of 100%, and natural heat dissipation as the cooling method.

[0262] The specific test results are shown in Table 1.

[0263] like Figure 13 and Figure 15 As shown, one end of the first portion 21 of the first busbar 2a along the third direction Z is aligned with one end of the second portion 22, and the other end extends beyond the other end of the second portion 22. The extended portion extends along the third direction Z to connect with the flexible circuit board 71 of the battery device 100. The dimensions of the cutout areas along the third direction Z from the aligned end to the other end are X1, X2, X3, and X4, respectively. Figure 13 and Figure 15 Taking the orientation shown as an example, the left end of the first part 21 is aligned with the left end of the second part 22, and the right end of the first part 21 extends beyond the right end of the second part 22. Figure 13 and Figure 15 The leftmost melt (connector 231) is the first melt, and the first, second, third, and fourth melts are arranged sequentially from left to right. In Table 1, X1 represents the dimension of the notch on the left side of the first melt in the third direction Z, and X2 represents the distance between the first and second melts in the third direction Z. Thus, the dimensions of the multiple gaps from left to right are X1, X2, X3, and X4, respectively. It can be understood that... Figure 13 The three melts (connecting parts 231) shown in the diagram are, from left to right, the first melt, the second melt, and the third melt. The melt-breaking part 23 has dimensions X1, X2, and X3, but does not have X4.

[0264] Table 1

[0265] According to Examples 2 to 4 in Table 1, it can be seen that setting the cross-sectional area of ​​each melt (connecting part 231) to be the same helps to reduce the maximum melting time difference.

[0266] According to Examples 1, 2, 5 to 8 in Table 1, when the cross-sectional area of ​​the fusing portion 23 is the same and the cross-sectional area of ​​each melt (connecting portion 231) is the same, the maximum fusing time difference of the fusing portion 23 with fewer melts (connecting portions 231) is smaller than that of the fusing portion 23 with more melts (connecting portions 231).

[0267] As can be seen from Examples 5 to 8 in Table 1, within a certain range, the larger X1 is, the smaller X2 and X3 are, and the smaller the maximum fuse breaking time difference is.

[0268] As shown in Table 1, the maximum melting time difference in Example 5 is relatively small. For example, the first busbar 2a has three melts (connecting parts 231), with X1 being 8 mm, X2 being 5 mm, and X3 being 7 mm.

[0269] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 all should be covered within the scope of the 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.

Claims

1. A battery device, characterized in that, include: Multiple battery cells; Multiple busbars are provided, and the battery cells are electrically connected to each other through the busbars. The multiple busbars include a first busbar, which is disposed on one side of the battery cell along a first direction. The first busbar includes a first part, a second part, and a fuse part. The first part and the second part are respectively connected to the two ends of the fuse part along a second direction. The first part and the second part are respectively electrically connected to two battery cells. An insulating covering portion covers at least the surface of the fusible portion facing the battery cell along the first direction, and also covers two opposing surfaces of the fusible portion along a third direction. A portion of the fusible portion is exposed from the side facing away from the battery cell along the first direction. The first direction, the second direction, and the third direction intersect each other. An insulating protective component, wherein the insulating protective component covers at least the side of the busbar and the insulating covering portion facing away from the battery cell along the first direction, the insulating protective component has a weak portion projected into the same projection plane along the first direction, and the projection of at least one of the fuse portions exposed on its side facing away from the battery cell along the first direction overlaps with the projection of the weak portion.

2. The battery device according to claim 1, characterized in that, The cross-sectional area of ​​the first busbar at the fused portion is smaller than the cross-sectional area of ​​the first busbar at other portions, and the cross-section is perpendicular to the second direction.

3. The battery device according to claim 2, characterized in that, The insulating covering portion also covers the portion of the fuse portion facing away from the battery cell along the first direction. The insulating covering portion has a first outlet on its side facing away from the battery cell along the first direction, and a portion of the fuse portion is exposed through the first outlet.

4. The battery device according to claim 3, characterized in that, The fusible portion is configured as a bent structure, and a portion of the fusible portion is recessed relative to the first portion and the second portion toward the battery cell side.

5. The battery device according to claim 4, characterized in that, A portion of the insulating covering is recessed relative to the first and second portions toward the battery cell side to form a groove. The bottom wall of the groove has an embedding groove, and the embedding groove has a first outlet on the inner surface of the bottom wall. A portion of the fusible part is embedded in the side wall of the groove, and another portion is embedded in the embedding groove and exposed through the first outlet.

6. The battery device according to any one of claims 1, 2, 3 to 5, characterized in that, The fuse portion includes multiple connecting portions, which are connected between the first portion and the second portion and are arranged at intervals along a third direction, with the first direction, the second direction, and the third direction intersecting each other.

7. The battery device according to claim 6, characterized in that, A perforation is formed between adjacent connecting portions along the third direction, and a portion of the insulating covering portion fills the perforation; and / or, A gap is formed between the connecting portion located at the edge along the third direction and the first and second portions, and part of the insulating covering portion fills the gap.

8. The battery device according to claim 6, characterized in that, The connecting portion includes a first sub-portion, a second sub-portion, and a third sub-portion that are sequentially and cross-connected. One end of the first sub-portion is connected to the surface of the first portion facing the second portion, and the other end is inclined toward the battery cell and connected to one end of the second sub-portion. One end of the third sub-portion is connected to the surface of the second portion facing the first portion, and the other end is inclined toward the battery cell and connected to the other end of the second sub-portion. The insulating covering covers the surfaces of the first and third sub-parts facing away from the battery cell, while the surface of the second sub-part facing away from the battery cell is exposed.

9. The battery device according to claim 6, characterized in that, The portion of the first part that overlaps with the second part along the second direction has a dimension of L1 in the third direction, and the arrangement area of ​​all the connecting parts has a dimension of L2 in the third direction. The value of L2 / L1 is greater than or equal to 30% and less than or equal to 70%.

10. The battery device according to claim 6, characterized in that, The cross-sectional area of ​​each of the connecting parts is the same.

11. The battery device according to claim 6, characterized in that, The battery cell has terminals. The first part has a first positioning hole, and the first part is connected to one of the terminals of one of the battery cells, wherein the first positioning hole and the terminal share a common central axis. The second part has a second positioning hole, and the second part is connected to one of the terminals of another battery cell, with the second positioning hole and the terminal sharing a common central axis. Along the third direction, the first and last connecting portions are symmetrically arranged with respect to the line connecting the center of the first positioning hole and the center of the second positioning hole.

12. The battery device according to claim 11, characterized in that, The line connecting the center of the first positioning hole and the center of the second positioning hole is located in the second direction. The length of the line connecting the center of the first positioning hole and the center of the second positioning hole is L3, the dimension of the connecting part along the second direction is L4, and the value of L3 / L4 is equal to 2.

13. The battery device according to any one of claims 1, 2, 3 to 5, 7 to 12, characterized in that, The battery device further includes a sampling component, which is located on the same side of the battery cell along the first direction as the first busbar. One end of the first part extends beyond the second part along a third direction and is electrically connected to the sampling component. The first direction, the second direction, and the third direction intersect each other.

14. The battery device according to any one of claims 1, 2, 3 to 5, 7 to 12, characterized in that, The insulating covering is injection molded onto the surface of the fused portion.

15. The battery device according to any one of claims 1, 2, 3 to 5, 7 to 12, characterized in that, The material of the insulating covering includes at least one of plastic, rubber and silicone.

16. The battery device according to any one of claims 1, 2, 3 to 5, 7 to 12, characterized in that, At least a portion of the plurality of battery cells are arranged sequentially along a second direction, which intersects the first direction. The battery device further includes end plates, with one end plate disposed on each side of each of the plurality of battery cells along the second direction. The adjacent battery cells along the second direction are connected in series or in parallel through the busbars, and at least one of the busbars that is farthest from the two end plates along the second direction is the first busbar.

17. The battery device according to any one of claims 1, 2, 3 to 5, 7 to 12, characterized in that, The insulating protective component includes an insulating body and a cover. The insulating body has a second outlet, and the cover covers the second outlet. The edge of the cover is connected to the surface of the insulating body facing away from the battery cell. The portion of the cover corresponding to the second outlet is the weak point.

18. An electrical appliance, characterized in that, The electrical device includes a plurality of battery devices as described in any one of claims 1 to 17, the battery devices being used to store or provide electrical energy.

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