A battery device, a bus member, and an electric appliance

Abstract

The application relates to the technical field of batteries, and provides a battery device, a current collection component and a power utilization equipment. The battery device comprises a current collection component and at least two battery monomers. The battery monomer comprises a shell and an electrode terminal. The electrode terminal is arranged on the shell. The current collection component is located outside the shell. The current collection component is electrically connected with the electrode terminals of the at least two battery monomers. The current collection component forms at least one stress release groove. The stress release groove penetrates through two opposite end faces of the current collection component and penetrates through the side face connecting the two end faces of the current collection component. In the case that the battery device is subjected to vibration impact, the current collection component bears the force from the battery monomers. Since the current collection component forms at least one stress release groove, the stress release groove is a through groove with one opening. The current collection component has a larger deformation space when bearing the force. The wall surface of the stress release groove can be elastically deformed to dissipate energy, so that the problem of fragmentation of the current collection component due to no place to stretch can be avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery device, a busbar component, and an electrical appliance. Background Technology

[0002] Battery devices can be used to store or provide electrical energy. They can be used in electrical equipment, such as vehicles or energy storage devices.

[0003] In related technologies, a battery device includes at least two battery cells and a current-carrying component. The current-carrying component is electrically connected to the electrode terminals of at least two battery cells. Taking the battery device used in a vehicle as an example, the battery device is easily subjected to vibration and impact during vehicle operation. The battery cells are easily displaced under vibration and impact, which pulls on the current-carrying component electrically connected to the electrode terminals, causing the current-carrying component to crack and be damaged. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery device, a busbar component, and an electrical appliance that can reduce the risk of busbar component cracking.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] This application provides a battery device, including:

[0007] At least two battery cells, each battery cell including a housing and electrode terminals, the electrode terminals being disposed in the housing;

[0008] A busbar component, located outside the housing, is electrically connected to the electrode terminals of at least two battery cells. The busbar component forms at least one stress relief groove that extends through two opposite end faces of the busbar component and through the side face of the busbar component connecting the two end faces.

[0009] The battery device provided in this application embodiment, when the battery device is subjected to vibration and impact, the busbar component bears the force from the battery cell. Since the busbar component forms at least one stress relief groove, which is a through groove with an opening, the busbar component has a larger deformation space when subjected to force. The wall surface of the stress relief groove can undergo expansion and contraction deformation to dissipate energy and avoid problems such as the busbar component breaking due to lack of space to extend. It can also adjust the stress distribution when the busbar component is subjected to forces from multiple directions, avoiding excessive stress concentration that could cause fatigue damage to the busbar component.

[0010] In some embodiments, the busbar component has a plate-like structure.

[0011] In this embodiment, the thickness of the busbar component is relatively small, while the size of the surface perpendicular to the thickness direction is relatively large. The busbar component has a simple structure and is easy to manufacture.

[0012] In some embodiments, the stress relief groove extends through two opposite end faces of the manifold in the thickness direction and passes through the peripheral side of the manifold surrounding the thickness direction.

[0013] In this embodiment, the stress relief groove can interrupt the continuity of the busbar component, change the stress transmission path, and cause the stress to diffuse to the wall of the stress relief groove. Since the stress relief groove penetrates the peripheral side of the busbar component around the thickness direction to form an opening, when the busbar component is subjected to the force from the battery cell, the parts around the stress relief groove are more likely to move closer or further away. By absorbing vibration energy through deformation, the stress accumulation caused by the closed-loop wall constraint of the through hole is avoided, which can better prevent the busbar component from cracking due to vibration.

[0014] In some embodiments, the wall of the stress relief groove is curved.

[0015] In this embodiment, the stress relief groove is roughly arc-shaped. When the battery device is subjected to vibration and impact, the busbar component bears a composite vibration load of multiple directions and frequencies. The multi-directional vibration will simultaneously generate a complex stress distribution in the busbar component. The arc-shaped surface can significantly reduce the stress concentration factor, making the stress gradient decrease more gently and optimizing the stress distribution. During vibration, it absorbs some vibration energy through elastic deformation. Moreover, it is easy to manufacture and avoids the problem that the sharp corner design of the stress relief groove wall will become a new stress concentration point.

[0016] In some embodiments, the stress relief groove includes a first section that extends in a straight line and passes through the side of the junction component connecting the two end faces.

[0017] In this embodiment, the first segment is generally straight and has an opening. The processing method of the first segment is simple and easy to quickly form. When the area for arranging stress relief grooves on the busbar component is limited, the straight-extending first segment can also improve space utilization.

[0018] In some embodiments, the stress relief groove includes a second section connected to one end of the first section away from the side of the manifold, and the wall of the second section is arc-shaped.

[0019] In this embodiment, the first segment is roughly straight and has an opening, and the second segment connects to the end of the first segment away from the opening. The first segment can directionally guide stress transmission to the second segment, and the wall of the second segment is arc-shaped. When the battery device is subjected to vibration and impact, the busbar component bears a composite vibration load of multiple directions and frequencies. The second segment can significantly reduce the stress concentration factor, making the stress gradient decrease more gently, optimizing the stress distribution, and is easier to manufacture. The stress gradient change is more gentle, providing more directional expansion and contraction deformation, avoiding the problem that the sharp corner design of the stress relief groove wall becomes a new stress concentration point, and the stress relief effect is better.

[0020] In some embodiments, the stress relief groove includes at least two third segments, each of which connects to one end of the first segment away from the side of the busbar.

[0021] In this embodiment, the first segment and at least two third segments are able to adapt to stresses in different directions, allowing the busbar component to stretch and deform in multiple directions, thus reducing the risk of cracking of the busbar component.

[0022] In some embodiments, the included angle between two adjacent third segments is greater than 0° and less than 90°.

[0023] In this embodiment, the included angle between two adjacent third segments is greater than 0° and less than 90°, which can form a smoother stress gradient transition and reduce the overlapping area of ​​the stress release zone of each third segment, thus balancing the needs of saving space and stress release effect.

[0024] In some embodiments, the busbar includes at least two first connection regions, each of which is electrically connected to an electrode terminal of one of the battery cells, and at least one stress relief groove is provided between two adjacent first connection regions.

[0025] In this embodiment, at least one stress relief groove is provided between two adjacent first connection areas. The stress relief groove can provide deformation space and change the stress transmission path. When subjected to vibration and impact, the elastic deformation of the surrounding part of the stress relief groove absorbs part of the vibration energy, reducing the stress transmitted to the first connection area, thereby avoiding local stress concentration to a certain extent.

[0026] In some embodiments, the electrode terminals of at least two battery cells are arranged at intervals along a first direction to form a terminal group, and at least two busbars are arranged at intervals along a first direction to form a busbar group; at least two first connection areas of each busbar are arranged at intervals along the first direction to electrically connect at least two electrode terminals of the terminal group.

[0027] In this embodiment, each electrode terminal of the terminal group corresponds to one battery cell and is connected to a first connection area. A terminal group may correspond to at least two busbars, through which all electrode terminals of a terminal group can be electrically connected.

[0028] In some embodiments, at least two of the battery cells are arranged at intervals along a first direction to form a cell group, wherein the large surface of the battery cell is perpendicular to the first direction.

[0029] In this embodiment, the large surface of the battery cell is perpendicular to the first direction, and the large surfaces of the battery cells in each cell group are roughly parallel. When the battery cells expand during charging and discharging or are subjected to vibration and impact, adjacent battery cells are more likely to move closer or further apart along the first direction, causing the busbar to be subjected to a force in the first direction. Multiple stress relief grooves are spaced apart along the first direction, which can better adapt to the deformation of the busbar along the first direction, alleviate the force from the battery cells, and reduce the risk of cracking of the busbar.

[0030] In some embodiments, the busbar component has a plate-like structure, and a portion of the busbar component is stamped toward one side in the thickness direction to form a first forming portion, wherein the first connecting area is located in the first forming portion.

[0031] In this embodiment, the first molding part is formed by stamping. During the stamping process, the busbar component undergoes plastic deformation under high pressure to form the first molding part, thereby increasing the strength of the first molding part. The first connection area is located in the first molding part, that is, at least part of the first molding part is the first connection area, which is beneficial to improving the stress resistance of the first connection area, thereby providing more reliable current transmission.

[0032] In some embodiments, the battery device includes a flexible circuit board, and the busbar includes a second connection area electrically connected to the flexible circuit board.

[0033] In this embodiment, the flexible circuit board is used for signal transmission and features lightweight, thinness, and good flexibility. The flexible circuit board can be used to collect parameters such as voltage and temperature of individual battery cells and transmit the data to the battery management system. The busbar component is electrically connected to the electrode terminals and is mainly used for power transmission. The second connection area is electrically connected to the flexible circuit board to achieve signal transmission, ensuring the coordination of signal and power transmission and reducing assembly complexity.

[0034] In some embodiments, at least one of the stress relief grooves extends through one end of the manifold away from the second connection area.

[0035] In this embodiment, the opening of the stress relief groove is formed at the end of the busbar component away from the second connection area, which can take into account both the structural strength requirements and stress relief requirements of the area surrounding the second connection area.

[0036] In some embodiments, the busbar includes at least two first connection regions, each of which is electrically connected to an electrode terminal of one of the battery cells, and at least one stress relief groove is located between the first connection region and the second connection region.

[0037] In this embodiment, at least one stress relief groove is provided between the first connection area and the second connection area. The stress relief groove can provide deformation space and change the stress transmission path. When subjected to vibration and impact, the elastic deformation of the surrounding part of the stress relief groove absorbs part of the vibration energy, thereby reducing the stress transmitted to the first connection area and the second connection area.

[0038] In some embodiments, at least two of the current-carrying components are arranged sequentially at intervals to form a current-carrying group. The two current-carrying groups are disposed at opposite ends of the flexible circuit board, and the two electrode terminals of each battery cell are electrically connected to the current-carrying components in the two current-carrying groups respectively.

[0039] In this embodiment, two busbars are located at opposite ends of the flexible circuit board. The distance between the busbars and the flexible circuit board is moderate, which helps to reduce assembly difficulty. Multiple battery cells can be connected in series, in parallel, or in a mixed manner through the two busbars.

[0040] In some embodiments, the battery device includes an insulating separator disposed between the battery cell and the busbar component, the insulating separator having clearance holes through which a portion of the busbar component is electrically connected to the electrode terminals.

[0041] In this embodiment, the insulating isolation plate can have an insulating function, which can insulate and isolate the outer shell and the busbar component, avoid short circuit between the outer shell and the busbar component, and achieve insulation protection.

[0042] This application provides a busbar component that is electrically connected to the electrode terminals of at least two battery cells. The busbar component forms at least one stress relief groove that extends through two opposite end faces of the busbar component and through the side face of the busbar component connecting the two end faces.

[0043] This application provides an electrical device, characterized in that the electrical device includes any of the battery devices described above. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the battery device in some embodiments of this application, wherein the busbar component is not shown;

[0046] Figure 3 This is an exploded view of a battery cell, a busbar component, a flexible circuit board, and an insulating separator in some embodiments of this application;

[0047] Figure 4 This is a schematic diagram of the structure of the busbar component in some embodiments of this application;

[0048] Figure 5 for Figure 4 Schematic diagram of the AA section;

[0049] Figure 6 This is a schematic diagram of the structure of the busbar component in some other embodiments of this application;

[0050] Figure 7 This is a schematic diagram of the structure of the busbar component in some embodiments of this application.

[0051] Explanation of reference numerals in the attached figures

[0052] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1, Battery Cell; 11, Housing; 12, Electrode Terminal; 2, Busbar Component; 21, Stress Relief Groove; 21a, Opening of Stress Relief Groove 21; 211, First Section; 212, Second Section; 213, Third Section; 22, First Connection Area; 23, First Molding Section; 24, Second Connection Area; 25, Second Molding Section; 26, Clearance Groove; 3, Flexible Circuit Board; 4, Insulating Separator; 41, Clearance Hole; 5, Housing; 51, First Housing; 52, Second Housing; X, First Direction; Y, Second Direction; Z, Up and Down Direction. Detailed Implementation

[0053] 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.

[0054] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0055] In the description of the embodiments of this application, the technical terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0056] 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.

[0057] It should be noted that in this application, "at least two" refers to a quantity of two or more. "Multiple" refers to a quantity of two or more.

[0058] Please see Figure 2 To facilitate understanding of the battery cell 1, battery device 100, and electrical equipment provided in the embodiments of this application, some basic structures of the battery cell 1, battery device 100, and electrical equipment provided in the embodiments of this application will be introduced first.

[0059] In this embodiment of the application, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0060] The battery cell 1 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.

[0061] A single battery cell 1 typically includes an electrode assembly, which comprises 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 single battery cell 1, 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, serves to prevent short circuits between the electrodes while allowing active ions to pass through.

[0062] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0063] 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.

[0064] 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.).

[0065] 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 positive electrode active materials for batteries 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0067] 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.).

[0068] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0069] 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.

[0070] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 1. 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 cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In some embodiments, the battery cell 1 further 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-like, or solid.

[0076] Liquid electrolytes include electrolyte salts and solvents.

[0077] 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.

[0078] 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.

[0079] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain performance of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high-temperature performance of the battery cell 1, additives that improve the low-temperature performance of the battery cell 1, etc.

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

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

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

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

[0084] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0085] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0086] In some implementations, the electrode assembly is a stacked structure.

[0087] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0088] 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.

[0089] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0090] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0091] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0092] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0093] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] In some implementations, please refer to Figure 3 The battery cell 1 may include a casing 11. The casing 11 may be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing 11), or an aluminum-plastic film, etc. In some embodiments, the casing 11 may be a sealed structure or a non-sealed structure. As an example, when the casing 11 is a non-sealed structure, the casing 11 serves to protect the electrode assembly, and a sealing bag is also included between the casing 11 and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing 11 is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0095] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. This application does not have any particular limitations.

[0096] In some embodiments, a pressure relief mechanism is provided on the outer casing 11. The pressure relief mechanism is used to release the internal gas of the battery cell 1.

[0097] As an example, when the internal pressure or temperature of battery cell 1 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of battery cell 1 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in battery cell 1.

[0098] As an example, the pressure relief mechanism can be integrally formed with the housing 11.

[0099] As an example, the pressure relief mechanism can also be separately configured and connected to the housing 11.

[0100] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 1. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 1 are discharged outwards from the actuated portion as waste. This method enables the battery cell 1 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0101] In some embodiments, when the housing 11 is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 1.

[0102] The emissions from battery cell 1 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0103] Please see Figure 2 This application provides a battery device 100, which includes a battery cell 1 as described in any embodiment of this application.

[0104] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 1.

[0105] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 1.

[0106] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 1 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0107] In some embodiments, the battery device 100 may be a battery pack; see [link to relevant documentation]. Figure 2 The battery pack includes a housing 5 and one or more battery cell assemblies, with the battery cell assemblies housed in the housing 5.

[0108] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 5 by fixing the battery module in the housing 5.

[0109] As an example, the battery cell assembly can also be housed in the housing 5 by directly fixing multiple battery cells 1 to the housing 5.

[0110] For example, please refer to Figure 2 The housing 5 may include a first housing 51 and a second housing 52. The first housing 51 and the second housing 52 are fastened together to form a closed space inside the housing 5 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0111] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0112] This application provides an electrical device, which includes a battery device 100 as described in any embodiment of this application. The battery device 100 is used to store or provide electrical energy.

[0113] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, vehicles, ships, or spacecraft. Vehicles can include electric bicycles and electric cars; electric toys can include electric bicycle toys and electric car toys, etc., including stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0114] Energy storage devices include, but are not limited to, energy storage containers or energy storage cabinets.

[0115] 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.

[0116] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The 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 electric vehicles, etc. Figure 1 As 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.

[0117] 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.

[0118] In related technologies, the busbar component is fixed to the battery cell. When the battery device is subjected to vibration and impact, the battery cell moves and pulls the busbar component. After the busbar component is fixed, its free deformation is restricted, and the vibration energy cannot be dissipated. Due to stress concentration, the busbar component is prone to fatigue cracks under repeated vibration loads, causing the busbar component to crack and be damaged. In severe cases, it may even cause a short circuit in the battery device.

[0119] In view of this, embodiments of this application provide a battery device, including a busbar and at least two battery cells. Each battery cell includes a housing and electrode terminals, with the electrode terminals disposed on the housing. The busbar is located outside the housing and electrically connects to the electrode terminals of at least two battery cells. The busbar forms at least one stress relief groove, which extends through two opposite end faces of the busbar and through the side of the busbar connecting the two end faces.

[0120] The battery device provided in this application embodiment, when the battery device is subjected to vibration and impact, the busbar component bears the force from the battery cell. Since the busbar component forms at least one stress relief groove, which is a through groove with an opening, the busbar component has a larger deformation space when subjected to force. The wall surface of the stress relief groove can undergo expansion and contraction deformation to dissipate energy and avoid problems such as the busbar component breaking due to lack of space to extend. It can also adjust the stress distribution when the busbar component is subjected to forces in multiple directions, avoiding excessive stress concentration that could cause fatigue damage to the busbar component.

[0121] The battery device 100 provided in the embodiments of this application is further described below with reference to the accompanying drawings. Please refer to the accompanying drawings. Figures 2 to 4 The battery device 100 provided in this application embodiment includes a busbar component 2 and at least two battery cells 1. The battery cell 1 includes a housing 11 and electrode terminals 12, with the electrode terminals 12 disposed on the housing 11. The busbar component 2 is located outside the housing 11 and is electrically connected to the electrode terminals 12 of at least two battery cells 1. The busbar component 2 forms at least one stress relief groove 21, which penetrates two opposite end faces of the busbar component 2 and also penetrates the side face of the busbar component 2 connecting the two end faces.

[0122] The housing 11 contains an electrode assembly and is used to protect the internal electrode assembly and tabs, etc.

[0123] At least a portion of the electrode terminal 12 is located outside the housing 11, and the electrode terminal 12 is electrically connected to a tab located inside the housing 11. The electrode terminal 12 can be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal 12 is used to transmit current to the outside of the housing 11.

[0124] The busbar 2 is conductive to enable current output. The busbar 2 is used to establish an electrical connection between at least two battery cells 1.

[0125] Each battery cell 1 includes two electrode terminals 12, one of which is a positive electrode terminal 12 and the other is a negative electrode terminal 12. A busbar 2 does not electrically connect the positive electrode terminal 12 and the negative electrode terminal 12 of a single battery cell 1, but instead electrically connects the electrode terminals 12 of different battery cells 1.

[0126] Each busbar 2 can be electrically connected to the electrode terminals 12 of two, three or more battery cells 1.

[0127] Multiple battery cells 1 can be connected in series, parallel or mixed through one or more busbar components 2.

[0128] For example, "hybrid connection" refers to at least two battery cells 1 being connected in both series and parallel. Multiple battery cells 1 can be directly connected in series, parallel, or hybrid connections; of course, at least two battery cells 1 can first be connected in series, parallel, or hybrid connections to form a module, and then the module can be connected in series, parallel, or hybrid connections to form a whole.

[0129] Taking a busbar 2 electrically connecting two battery cells 1 as an example, in some embodiments, the busbar 2 can electrically connect the positive electrode terminal 12 of one battery cell 1 and the negative electrode terminal 12 of the other battery cell 1, thus connecting the two battery cells 1 in series. In other embodiments, the busbar 2 can electrically connect the positive electrode terminal 12 of one battery cell 1 and the positive electrode terminal 12 of the other battery cell 1, thus connecting the two battery cells 1 in parallel. In still other embodiments, the busbar 2 can electrically connect the negative electrode terminal 12 of one battery cell 1 and the negative electrode terminal 12 of the other battery cell 1, thus connecting the two battery cells 1 in parallel.

[0130] Each busbar component 2 may form one or more stress relief grooves 21.

[0131] The stress relief groove 21 penetrates the two opposite end faces of the manifold 2 and also penetrates the side surface connecting the two end faces. Specifically, the stress relief groove 21 penetrates the three outer surfaces of the manifold 2, with two end faces opposite each other and one side surface connecting the two end faces. In other words, the stress relief groove 21 is a through groove with an opening. Unlike a through hole which has a complete closed annular wall, the stress relief groove 21 does not have a complete closed annular wall, but rather an open annular wall.

[0132] The battery device 100 provided in this application embodiment, when the battery device 100 is subjected to vibration and impact, the busbar component 2 bears the force from the battery cell 1. Since the busbar component 2 forms at least one stress relief groove 21, which is a through groove with an opening, the busbar component 2 has a larger deformation space when subjected to force. The wall surface of the stress relief groove 21 can undergo expansion and contraction deformation to dissipate energy and avoid problems such as the busbar component 2 breaking due to lack of space to extend. It can also adjust the stress distribution when the busbar component 2 is subjected to forces from multiple directions, avoiding excessive stress concentration that could cause fatigue damage to the busbar component 2.

[0133] In some embodiments, the housing 11 includes an end cap and a housing, the housing having an opening and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more times. The electrode terminal 12 may be provided on the end cap or on the housing.

[0134] In some embodiments, the busbar component 2 is a single, integral structure. That is, the busbar component 2 is an inseparable whole.

[0135] In some embodiments, the busbar component 2 is a one-piece molded structure. That is, the busbar component 2 can be manufactured using a one-piece molding process.

[0136] In some embodiments, the busbar component 2 is a metallic structure. That is, the busbar component 2 is made of metallic material. The busbar component 2 is a rigid structure that can maintain its shape.

[0137] For example, the busbar component 2 is made of aluminum or an alloy, etc.

[0138] In some embodiments, please refer to Figures 4 to 7 The busbar component 2 has a plate-like structure.

[0139] In this embodiment, the thickness of the busbar component 2 is relatively small, while the size of the surface perpendicular to the thickness direction is relatively large. The busbar component 2 has a simple structure and is easy to manufacture.

[0140] In some embodiments, the busbar component 2 is a sheet metal structure. A sheet metal structure is a structure formed by cold working of a metal sheet, such as stamping, shearing, or bending.

[0141] In some embodiments, please refer to Figures 4 to 7 The stress relief groove 21 penetrates the two opposite end faces of the manifold 2 in the thickness direction and extends through the peripheral side of the manifold 2 surrounding the thickness direction. Specifically, the peripheral side of the manifold 2 connects the two opposite end faces in the thickness direction.

[0142] For example, one end face of the busbar component 2 in the thickness direction can be connected to the electrode terminal 12. In this way, the connection area between the busbar component 2 and the electrode terminal 12 can be larger, improving the stability and reliability of the connection.

[0143] In this embodiment, the stress relief groove 21 can interrupt the continuity of the busbar component 2, change the stress transmission path, and cause the stress to diffuse to the wall of the stress relief groove 21. Since the stress relief groove 21 penetrates the peripheral side of the busbar component 2 around the thickness direction to form an opening, when the busbar component 2 is subjected to the force from the battery cell 1, the parts around the stress relief groove 21 are more likely to move closer or further away. By absorbing vibration energy through deformation, stress accumulation caused by the closed-loop wall constraint of the through hole is avoided, and the busbar component 2 can be better prevented from cracking due to vibration.

[0144] In some embodiments, please refer to Figures 4 to 7 A portion of the manifold 2 is stamped toward one side in the thickness direction to form a second molded portion 25, which is located at the corner of the manifold 2.

[0145] In this embodiment, the busbar component 2 provides stress relief through the stress relief groove 21, while also needing a certain structural strength to bear the current output function. The corners are the corner positions of the busbar component 2. The second pressing part 25 is formed by stamping, which can improve the structural strength of the corners of the busbar component 2, balance the structural strength requirements and deformation capacity requirements, and thus better bear the current output function.

[0146] In some embodiments, please refer to Figure 7 The wall of the stress relief groove 21 is arc-shaped. Exemplarily, the arc-shaped surface includes a circular arc surface and an elliptical arc surface.

[0147] For example, the busbar component 2 is a plate-shaped structure, with a plane perpendicular to the thickness direction of the busbar component 2 as the projection plane, and the projection of the wall of the stress relief groove 21 is an arc, such as a circular arc or an elliptical arc.

[0148] In this embodiment, the stress relief groove 21 is roughly arc-shaped. When the battery device 100 is subjected to vibration and impact, the busbar component 2 bears a composite vibration load of multiple directions and frequencies. The multi-directional vibration will simultaneously generate a complex stress distribution in the busbar component 2. The arc-shaped surface can significantly reduce the stress concentration coefficient, making the stress gradient decrease more gently and optimizing the stress distribution. During vibration, it absorbs some vibration energy through elastic deformation. Moreover, it is easy to manufacture and avoids the problem that the sharp corner design of the stress relief groove 21 wall surface becomes a new stress concentration point.

[0149] In some embodiments, please refer to Figures 4 to 6 The stress relief groove 21 includes a first section 211, which extends in a straight line and passes through the side of the two end faces of the confluence component 2.

[0150] The first segment 211 extends in a straight line, meaning that the axis of the first segment 211 is a straight line.

[0151] The first segment 211 extends through the side of the busbar 2 connecting the two end faces; that is, the first segment 211 has an opening. Exemplarily, the first segment 211 extends through the circumferential side of the plate-shaped busbar 2 surrounding the thickness direction.

[0152] In this embodiment, the first segment 211 is generally straight and has an opening. The processing method of the first segment 211 is simple and easy to quickly form. When the area of ​​the stress relief groove 21 on the busbar component 2 is limited, the straight-extending first segment 211 can also improve the space utilization rate.

[0153] In some embodiments, please refer to Figure 4 The stress relief groove 21 includes a second section 212, which is connected to one end of the first section 211 away from the side of the confluence component 2. The wall of the second section 212 is arc-shaped.

[0154] For example, the wall surface of the second segment 212 is a circular arc surface or an elliptical arc surface.

[0155] In this embodiment, the first segment 211 is generally straight and has an opening, and the second segment 212 connects to the end of the first segment 211 away from the opening. The first segment 211 can directionally guide stress transmission to the second segment 212. The wall surface of the second segment 212 is arc-shaped. When the battery device 100 is subjected to vibration and impact, the busbar component 2 bears a composite vibration load of multiple directions and frequencies. The second segment 212 can significantly reduce the stress concentration coefficient, making the stress gradient decrease more gently, optimizing the stress distribution, and is easy to manufacture. The stress gradient change is more gentle, providing more directions of expansion and contraction deformation, avoiding the problem that the sharp corner design of the stress relief groove 21 wall surface becomes a new stress concentration point, and the stress relief effect is better.

[0156] In some embodiments, please refer to Figure 6 The stress relief groove 21 includes at least two third sections 213, each third section 213 being connected to one end of the first section 211 away from the side of the busbar 2.

[0157] The number of 213 in the third segment can be two, three, or more.

[0158] The fact that each third segment 213 is connected to the end of the first segment 211 away from the junction component 2 means that each third segment 213 is connected to the end of the first segment 211 away from the opening.

[0159] In this embodiment, the first segment 211 and at least two third segments 213 can adapt to stresses in different directions, allowing the busbar component 2 to stretch and deform in multiple directions, thus reducing the risk of cracking of the busbar component 2.

[0160] In some embodiments, please refer to Figure 6 The included angle between two adjacent third segments 213 is greater than 0° and less than 90°. Specifically, the included angle between two adjacent third segments 213 is an acute angle.

[0161] Please see Figure 6 Taking the third segment 213 as an example with two segments, the stress relief groove 21 is roughly Y-shaped.

[0162] In this embodiment, the included angle between two adjacent third segments 213 is greater than 0° and less than 90°, which can form a smoother stress gradient transition and reduce the overlap area of ​​the stress release zone of each third segment 213, thus balancing space saving and stress release effect requirements.

[0163] In some embodiments, please refer to Figures 4 to 6 The busbar component 2 includes at least two first connection areas 22, each first connection area 22 being electrically connected to the electrode terminal 12 of a battery cell 1, and at least one stress relief groove 21 being provided between two adjacent first connection areas 22.

[0164] The number of first connection areas 22 is the same as the number of battery cells 1, and each first connection area 22 is connected to one electrode terminal 12 of one battery cell 1.

[0165] Taking the busbar component 2 as an example, which includes two first connection areas 22, one or more stress relief grooves 21 are provided between the two first connection areas 22.

[0166] Taking the busbar component 2 as an example, which includes three first connection areas 22, in some embodiments, a stress relief groove 21 is provided between any two adjacent first connection areas 22; in other embodiments, multiple stress relief grooves 21 are provided between any two adjacent first connection areas 22.

[0167] The connection method between the first connection area 22 and the electrode terminal 12 is not limited. For example, the first connection area 22 and the electrode terminal 12 can be welded or fixedly connected by other means.

[0168] Taking the welding of the first connection area 22 and the electrode terminal 12 as an example, heat will be generated during the welding process of the first connection area 22 and the electrode terminal 12. The stress relief groove 21 can provide deformation space for the surrounding parts of the first connection area 22, and alleviate the stress concentration problem caused by thermal expansion during the welding process.

[0169] In this embodiment, at least one stress relief groove 21 is provided between two adjacent first connection areas 22. The stress relief groove 21 can provide deformation space and change the stress transmission path. When subjected to vibration impact, the elastic deformation of the surrounding part of the stress relief groove 21 absorbs part of the vibration energy, reducing the stress transmitted to the first connection area 22, thereby avoiding local stress concentration to a certain extent.

[0170] In some embodiments, please refer to Figure 3 At least two battery cells 1 have their electrode terminals 12 spaced apart along the first direction X to form a terminal group, and at least two busbars 2 have their terminals spaced apart along the first direction X to form a busbar group; at least two first connection areas 22 of each busbar 2 are spaced apart along the first direction X to electrically connect at least two electrode terminals 12 of the terminal group.

[0171] Taking a busbar component 2 having two first connection areas 22 as an example, the two first connection areas 22 of each busbar component 2 are spaced apart along the first direction X to electrically connect the two electrode terminals 12 of the terminal group. Here, the two electrode terminals 12 belong to two battery cells 1 respectively.

[0172] In this embodiment, each electrode terminal 12 of the terminal group corresponds to one battery cell 1 and is connected to a first connection area 22. A terminal group may correspond to at least two busbars 2, and all electrode terminals 12 of a terminal group can be electrically connected through at least two busbars 2.

[0173] In some embodiments, please refer to Figure 3 At least two battery cells 1 are arranged at intervals along the first direction X to form a cell group, and the large surface of the battery cell 1 is perpendicular to the first direction X.

[0174] For example, the two electrode terminals 12 of each battery cell 1 can be spaced apart along a second direction Y, which intersects with the first direction X. Here, the second direction Y can intersect the first direction X perpendicularly or obliquely. With this design, the two electrode terminals 12 of each battery cell 1 belong to two terminal groups respectively.

[0175] In some embodiments, please refer to Figure 3 The first direction X, the second direction Y, and the vertical direction Z can be perpendicular to each other. The electrode terminal 12 can be located at the upper end of the housing 11, and the busbar component 2 can be located at the upper end of the electrode terminal 12.

[0176] A single unit group has two terminal groups, and multiple electrode terminals 12 of each terminal group are spaced apart along a first direction X.

[0177] A battery device 100 may include one or more individual cells.

[0178] Individual cells can be bundled and fixed into battery modules by cable ties. A battery device 100 can be equipped with one or more battery modules.

[0179] The large surface of the battery cell 1 is the surface with the largest area of ​​the outer shell 11 of the battery cell 1. Taking the square battery cell 1 as an example, the outer shell 11 of the square battery cell 1 is a cuboid, and the large surface of the square battery cell 1 is perpendicular to the first direction X. The large surfaces of the battery cells 1 in each cell group are roughly parallel.

[0180] In this embodiment, the large surface of the battery cell 1 is perpendicular to the first direction X, and the large surfaces of the battery cells 1 in each cell group are roughly parallel. When the battery cell 1 expands during charging and discharging or is subjected to vibration and impact, adjacent battery cells 1 are more likely to move closer or further apart along the first direction X, causing the busbar component 2 to be subjected to the force of the first direction X. Multiple stress relief grooves 21 are arranged at intervals along the first direction X, which can better adapt to the deformation of the busbar component 2 along the first direction X, alleviate the force from the battery cell 1, and reduce the risk of cracking of the busbar component 2.

[0181] In some embodiments, the battery device 100 includes a heat insulation pad, and at least one heat insulation pad may be disposed between two adjacent battery cells 1.

[0182] For example, one or more heat insulation pads may be provided between two adjacent battery cells 1.

[0183] In this embodiment, the heat insulation pad can reduce heat transfer between battery cells 1 and also act as an energy absorption buffer.

[0184] In some embodiments, please refer to Figures 4 to 6 The busbar component 2 has a plate-like structure. A portion of the busbar component 2 is stamped toward the thickness direction to form a first forming part 23. The first connecting area 22 is located in the first forming part 23.

[0185] For example, the thickness direction of the manifold 2 can be consistent with the vertical direction Z, and the stress relief groove 21 can penetrate the side of the manifold 2 along the second direction Y. That is, the opening 21a of the stress relief groove 21 is formed at one end of the manifold 2 along the second direction Y.

[0186] In this embodiment, the first molding part 23 is formed by stamping. During the stamping process, the busbar component 2 undergoes plastic deformation under high pressure to form the first molding part 23, thereby increasing the strength of the first molding part 23. The first connection area 22 is located in the first molding part 23, that is, at least part of the first molding part 23 is the first connection area 22, which is beneficial to improving the stress resistance of the first connection area 22, thereby providing more reliable current transmission.

[0187] In some embodiments, please refer to Figure 3 The battery device 100 includes a flexible circuit board 3, and the busbar component 2 includes a second connection area 24, which is electrically connected to the flexible circuit board 3.

[0188] Flexible printed circuit (FPC) is a type of flexible printed circuit board made from a flexible substrate.

[0189] The type of flexible substrate is not limited; for example, flexible substrates include, but are not limited to, polyimide or polyester film.

[0190] The second connection area 24 and the flexible circuit board 3 can be electrically connected by soldering.

[0191] In this embodiment, the flexible circuit board 3 is used for signal transmission and has the characteristics of being lightweight, thin, and flexible. The flexible circuit board 3 can be used to collect parameters such as voltage and temperature of the battery cell 1 and transmit the data to the battery management system. The busbar component 2 is electrically connected to the electrode terminal 12. The busbar component 2 is mainly used for power transmission. The second connection area 24 is electrically connected to the flexible circuit board 3 to realize signal transmission, which can ensure the coordination of signal and power transmission and reduce assembly complexity.

[0192] In some embodiments, please refer to Figure 3 At least one stress relief groove 21 extends through one end of the manifold 2 away from the second connection area 24.

[0193] For example, a stress relief groove 21 may be one end of the manifold 2 away from the second connection area 24. Alternatively, multiple stress relief grooves 21 may be one end of the manifold 2 away from the second connection area 24.

[0194] In this embodiment, the opening 21a of the stress relief groove 21 is formed at the end of the confluence component 2 away from the second connection area 24, which can take into account both the structural strength requirements and stress relief requirements of the area around the second connection area 24.

[0195] In some embodiments, please refer to Figure 7 The busbar component 2 includes at least two first connection areas 22, each first connection area 22 being electrically connected to the electrode terminal 12 of a battery cell 1, and at least one stress relief groove 21 being located between the first connection area 22 and the second connection area 24.

[0196] For example, a stress relief groove 21 may be located between the first connection area 22 and the second connection area 24. Multiple stress relief grooves 21 may be located between the first connection area 22 and the second connection area 24.

[0197] In some embodiments, the wall surface of the stress relief groove 21 located between the first connection region 22 and the second connection region 24 is arc-shaped. This arc-shaped arrangement of the stress relief groove 21 not only considers mechanical performance but also current density distribution, mitigating the risk of localized overheating due to structural changes and achieving multi-physics collaborative design. While ensuring sufficient structural strength, it provides the necessary flexibility to cope with vibration deformation. In some cases, experimental data shows that this design can increase the fatigue life of the busbar component 2 by three times.

[0198] In this embodiment, at least one stress relief groove 21 is provided between the first connection area 22 and the second connection area 24. The stress relief groove 21 can provide deformation space and change the stress transmission path. When subjected to vibration impact, the elastic deformation of the surrounding part of the stress relief groove 21 absorbs part of the vibration energy, thereby reducing the stress transmitted to the first connection area 22 and the second connection area 24.

[0199] In some embodiments, please refer to Figure 3 At least two current-collecting components 2 are arranged in sequence at intervals to form a current-collecting group. The two current-collecting groups are located at opposite ends of the flexible circuit board 3. The two electrode terminals 12 of each battery cell 1 are electrically connected to the current-collecting components 2 of the two current-collecting groups respectively.

[0200] For example, please refer to Figure 3Each battery cell 1 has two electrode terminals 12 located at both ends of the flexible circuit board 3 along the second direction Y, two terminal groups located at both ends of the flexible circuit board 3 along the second direction Y, and two bus groups located at both ends of the flexible circuit board 3 along the second direction Y.

[0201] In this embodiment, two busbars are located at opposite ends of the flexible circuit board 3. The distance between the busbars and the flexible circuit board 3 is moderate, which helps to reduce the assembly difficulty. The two busbars enable the series, parallel or mixed connection of multiple battery cells 1.

[0202] In some embodiments, please refer to Figure 3 The battery device 100 includes an insulating isolation plate 4, which is disposed between the battery cell 1 and the current collector 2. The insulating isolation plate 4 has a clearance hole 41, and part of the current collector 2 is electrically connected to the electrode terminal 12 through the clearance hole 41.

[0203] In some embodiments, electrode terminals 12 are disposed at the upper end of the housing 11, insulating separator 4 is located at the upper end of the battery cell 1, and at least a portion of the busbar 2 is located at the upper end of the insulating separator 4. The thickness direction of the insulating separator 4 may be consistent with the vertical direction Z.

[0204] For example, another portion of the busbar 2 may be supported by the insulating partition 4. For instance, the other portion of the busbar 2 may be located above the insulating partition 4. The insulating partition 4 provides support for the busbar 2, thereby supporting the busbar 2.

[0205] In some embodiments, the flexible circuit board 3 may be connected to the insulating partition 4. For example, the flexible circuit board 3 may be positioned above the insulating partition 4. The insulating partition 4 provides support for the flexible circuit board 3, thereby supporting the flexible circuit board 3.

[0206] The insulating barrier 4 can be a rigid structure, meaning that it can maintain its shape and remain essentially unchanged in deformation without compromising its structural form. Thus, the insulating barrier 4 possesses good structural strength.

[0207] For example, the insulating isolation plate 4 can be made of insulating materials such as rigid plastic.

[0208] In this embodiment, the insulating isolation plate 4 can have an insulating function, which can insulate and isolate the outer shell 11 and the busbar component 2, avoid short circuit between the outer shell 11 and the busbar component 2, and achieve insulation protection.

[0209] In some embodiments, please refer to Figures 4 to 7The busbar component 2 forms a clearance groove 26. The battery device 100 includes a top cover and an insulating fastener. At least a portion of the top cover is disposed above the battery cell 1. The insulating fastener passes through the top cover and the insulating isolation plate 4. At least a portion of at least one insulating fastener is located within the clearance groove 26.

[0210] It may be that at least a portion of an insulating fastener is located within the clearance groove 26. Alternatively, at least a portion of multiple insulating fasteners may be located within the clearance groove 26.

[0211] It is possible that part of the clearance groove 26 has insulated fasteners, while another part of the clearance groove 26 does not have insulated fasteners.

[0212] The insulating fastener can be detachably or non-detachably connected to the insulating isolation plate 4. For example, the insulating fastener can be a screw or bolt, thus allowing for a detachable connection between the insulating fastener and the insulating isolation plate 4. Alternatively, the insulating fastener can be a rivet, thus allowing for a non-detachable connection between the insulating fastener and the insulating isolation plate 4.

[0213] Insulating fasteners can be made of insulating materials such as rigid plastics.

[0214] In this embodiment, the insulating fastener has an insulating function, fixing the top cover and the insulating isolation plate 4 together.

[0215] The following describes the battery device 100 provided in this application embodiment further with a specific example. Please refer to [link to specific example]. Figures 3 to 5 The battery device 100 includes a busbar 2 and at least two battery cells 1. Each battery cell 1 includes a housing 11 and electrode terminals 12, with the electrode terminals 12 disposed on the housing 11. The busbar 2 is located outside the housing 11 and is electrically connected to the electrode terminals 12 of at least two battery cells 1. The busbar 2 forms at least one stress relief groove 21, which penetrates two opposite end faces of the busbar 2 and the side face connecting the two end faces. The busbar 2 has a plate-like structure. The stress relief groove 21 penetrates two opposite end faces of the busbar 2 in the thickness direction and the circumferential side face surrounding the thickness direction of the busbar 2. The stress relief groove 21 includes a first segment 211 and a second segment 212. The first segment 211 extends in a straight line and penetrates the side face connecting the two end faces of the busbar 2. The second segment 212 connects to the end of the first segment 211 away from the side face of the busbar 2, and the wall of the second segment 212 is arc-shaped.

[0216] The battery device 100 provided in this application embodiment has a stress relief groove 21 that can interrupt the continuity of the busbar component 2, change the stress transmission path, and cause the stress to diffuse to the wall of the stress relief groove 21. Since the stress relief groove 21 penetrates the peripheral side of the busbar component 2 around the thickness direction to form an opening, when the busbar component 2 is subjected to the force from the battery cell 1, the parts around the stress relief groove 21 are more likely to move closer or further away. By absorbing vibration energy through deformation, stress accumulation caused by the closed-loop wall constraint of the through hole is avoided, and the busbar component 2 can be better prevented from cracking due to vibration. The first segment 211 is roughly straight and has an opening. The second segment 212 connects to the end of the first segment 211 away from the opening. The first segment 211 can directionally guide stress transmission to the second segment 212. The wall of the second segment 212 is arc-shaped. When the battery device 100 is subjected to vibration and impact, the busbar component 2 bears a composite vibration load of multiple directions and frequencies. The second segment 212 can significantly reduce the stress concentration factor, making the stress gradient decrease more gently, optimizing the stress distribution, and is easier to manufacture. The stress gradient change is more gentle, providing more directions of expansion and contraction deformation, avoiding the problem that the sharp corner design of the stress relief groove 21 wall becomes a new stress concentration point, and the stress relief effect is better.

[0217] The above embodiments are only used to illustrate 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. 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. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that, include: At least two battery cells, each battery cell including a housing and electrode terminals, the electrode terminals being disposed in the housing; A busbar component, located outside the housing, is electrically connected to the electrode terminals of at least two battery cells. The busbar component forms at least one stress relief groove that extends through two opposite end faces of the busbar component and through the side face of the busbar component connecting the two end faces.

2. The battery device according to claim 1, characterized in that, The busbar component has a plate-like structure.

3. The battery device according to claim 2, characterized in that, The stress relief groove passes through the two opposite end faces of the manifold in the thickness direction and extends through the circumferential surface of the manifold in the thickness direction.

4. The battery device according to claim 1, characterized in that, The wall of the stress relief groove is arc-shaped.

5. The battery device according to claim 1, characterized in that, The stress relief groove includes a first section that extends in a straight line and passes through the side of the junction component connecting the two end faces.

6. The battery device according to claim 5, characterized in that, The stress relief groove includes a second section, which connects to one end of the first section away from the side of the busbar component, and the wall of the second section is arc-shaped.

7. The battery device according to claim 5, characterized in that, The stress relief groove includes at least two third sections, each of which is connected to the end of the first section away from the side of the busbar component.

8. The battery device according to claim 7, characterized in that, The included angle between two adjacent third segments is greater than 0° and less than 90°.

9. The battery device according to claim 1, characterized in that, The busbar component includes at least two first connection areas, each of which is electrically connected to an electrode terminal of one of the battery cells, and at least one stress relief groove is provided between two adjacent first connection areas.

10. The battery device according to claim 9, characterized in that, At least two of the battery cells have their electrode terminals spaced apart along a first direction to form a terminal group, and at least two of the busbars have their current-carrying components spaced apart along a first direction to form a busbar group; at least two first connection areas of each busbar are spaced apart along a first direction to electrically connect at least two electrode terminals of the terminal group.

11. The battery device according to claim 10, characterized in that, At least two of the battery cells are arranged at intervals along a first direction to form a cell group, and the large surface of the battery cell is perpendicular to the first direction.

12. The battery device according to claim 9, characterized in that, The busbar component has a plate-like structure, and a portion of the busbar component is stamped toward one side in the thickness direction to form a first forming part, with the first connecting area located in the first forming part.

13. The battery device according to claim 1, characterized in that, The battery device includes a flexible circuit board, and the busbar includes a second connection area, which is electrically connected to the flexible circuit board.

14. The battery device according to claim 13, characterized in that, At least one of the stress relief grooves extends through one end of the manifold component away from the second connection area.

15. The battery device according to claim 13, characterized in that, The busbar includes at least two first connection areas, each of which is electrically connected to an electrode terminal of one of the battery cells, and at least one stress relief groove is located between the first connection area and the second connection area.

16. The battery device according to claim 13, characterized in that, At least two of the current-collecting components are arranged sequentially at intervals to form a current-collecting group. The two current-collecting groups are disposed at opposite ends of the flexible circuit board. The two electrode terminals of each battery cell are electrically connected to the current-collecting components in the two current-collecting groups respectively.

17. The battery device according to any one of claims 1 to 16, characterized in that, The battery device includes an insulating isolation plate disposed between the battery cell and the current collector. The insulating isolation plate has clearance holes, and a portion of the current collector is electrically connected to the electrode terminals through the clearance holes.

18. A busbar component, characterized in that, The busbar is electrically connected to the electrode terminals of at least two battery cells. The busbar forms at least one stress relief groove that extends through two opposite end faces of the busbar and through the side face of the busbar connecting the two end faces.

19. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1 to 17.

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