Bus-bar assembly, battery, and electrical device

Abstract

A bus-bar assembly (10) inside a battery (100), used for achieving electrical connection of a plurality of battery cells (20), wherein the plurality of battery cells (20) and the bus-bar assembly (10) are accommodated in a case (30). The bus-bar assembly further comprises a heat absorption component (2); heat generated by the plurality of battery cells (20) can be transferred by means of a bus-bar component (1); the heat absorption component (2) is connected to the bus-bar component (1) to absorb the heat on the bus-bar component (1), so as to reduce the heat transferred from one battery cell (20) to another battery cell (20), thereby improving the reliability of the battery (100).

Description

Bus components, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420015058.2, filed on January 3, 2024, entitled “Bus assembly, battery and electrical equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a busbar assembly, a battery, and an electrical device. Background Art

[0004] The batteries most commonly used in vehicles are generally lithium-ion batteries. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.

[0005] A battery generally includes a plurality of battery cells and a busbar assembly, and the busbar assembly is used to achieve electrical connection between the plurality of battery cells.

[0006] For general batteries, the heat generated by one battery cell is transferred to another battery cell through the busbar assembly. Excessive heat transfer can easily affect the performance of the battery cell and even cause thermal runaway of the battery cell, thereby affecting the reliability of the battery cell.

[0007] Summary of the Invention

[0008] The present application provides a busbar assembly, a battery, and an electrical device to improve the problem that excessive heat transferred from the busbar assembly to the battery cells affects the reliability of the battery.

[0009] In a first aspect, an embodiment of the present application provides a busbar assembly comprising a busbar component and a heat absorbing component, wherein the busbar component is used to electrically connect a plurality of battery cells and the heat absorbing component is connected to the busbar component and configured to absorb heat from the busbar component.

[0010] In the above technical solution, the busbar component is connected to multiple battery cells, and the heat generated by the multiple battery cells can be transferred through the busbar component. The heat absorption component is connected to the busbar component, and the heat absorption component can absorb the heat on the busbar component. In the process of the busbar component transferring the heat generated by one battery cell to another battery cell, the heat absorption component can absorb the heat on the busbar component, so as to reduce the heat transferred from one battery cell to another battery cell, thereby improving the reliability of the battery cell.

[0011] In some embodiments, the heat-absorbing component includes a heat-absorbing portion made of an endothermic phase-change material or an endothermic decomposition material. The heat-absorbing portion absorbs heat from the manifold, thereby reducing the amount of heat transferred from the manifold to the battery cells. The heat-absorbing portion can undergo an endothermic phase-change or endothermic decomposition to create a temperature difference between the heat-absorbing component and the manifold, thereby absorbing heat from the manifold.

[0012] In some embodiments, the endothermic phase change material comprises a ternary carbonate, a nitrate, a fluoride, or a hydrochloride.

[0013] In some embodiments, the endothermic decomposition material comprises magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate, or lead carbonate.

[0014] In some embodiments, the heat absorbing component further includes a heat conducting portion, at least a portion of which is located between the heat absorbing component and the flow converging component to separate the heat absorbing component and the flow converging component. The heat conducting portion allows the heat conducting portion to conduct heat. By disposing at least a portion of the heat conducting portion between the heat absorbing component and the flow converging component, the heat conducting portion can transfer heat from the flow converging component to the heat absorbing component, thereby facilitating heat absorption by the heat absorbing component. The heat conducting portion separates the heat absorbing component and the flow converging component, thereby reducing the risk of the heat absorbing component contacting the flow converging component and thereby reducing the risk of the heat absorbing component affecting the normal operation of the flow converging component.

[0015] In some embodiments, the busbar assembly has a first surface facing away from the battery cells along a first direction, and the heat conducting portion is in contact with the first surface. At least a portion of the heat conducting portion is located between the heat absorbing portion and the busbar assembly along the first direction. The contact of the heat conducting portion with the first surface of the busbar assembly facilitates the heat conducting portion transferring heat from the busbar assembly to the heat absorbing portion. By disposing at least a portion of the heat conducting portion between the heat absorbing portion and the busbar assembly along the first direction, the heat absorbing portion and the busbar assembly are spaced apart, and the heat absorbing portion is located away from the battery cells, thereby reducing the impact of the heat absorbing portion on the battery cells.

[0016] In some embodiments, a housing cavity is formed within the heat-conducting portion, and the heat-absorbing portion is accommodated within the housing cavity. The heat-conducting portion is disposed within the heat-absorbing portion. When the heat-conducting portion undergoes a phase change or decomposition upon absorbing heat, the heat-conducting portion remains within the housing cavity, thereby reducing the risk of the heat-conducting portion contacting the current-collecting component or the battery cell, thereby improving the reliability of the battery cell.

[0017] In some embodiments, the volume of the heat absorbing portion is V1, and the volume of the heat conducting portion is V2, satisfying V1 / V2 ≥ 1. By setting V1 / V2 ≥ 1, the volume of the heat absorbing portion is not less than the volume of the heat conducting portion, thereby reducing the risk of poor heat absorption performance of the heat absorbing component. The higher the ratio of the volume of the heat absorbing portion to the volume of the heat absorbing component, the more heat the heat absorbing component can absorb, and the better the heat absorption performance.

[0018] In some embodiments, the heat conducting portion is provided with a through hole that communicates with the accommodating cavity. By providing a through hole in the heat conducting portion and communicating the through hole with the accommodating cavity, when the heat absorbing portion within the heat conducting portion is an endothermic phase change material, the endothermic phase change material changes volume after absorbing heat, affecting the internal pressure of the accommodating cavity. The accommodating cavity can adjust its internal pressure through the through hole, thereby reducing the impact of heat absorption by the heat absorbing portion on the heat conducting portion. When the heat absorbing portion within the heat conducting portion is an endothermic decomposition material, the endothermic decomposition material can generate gas within the accommodating cavity and discharge the gas from the accommodating cavity through the through hole, thereby reducing the impact of heat absorption by the heat absorbing portion on the heat conducting portion.

[0019] In some embodiments, the current collecting component has a first surface facing away from the battery cell along a first direction, with the heat conducting portion in contact with the first surface. The heat conducting portion also has a second surface facing away from the first surface along the first direction, with a through hole provided on the second surface. The through hole is provided on the side of the heat conducting portion away from the battery cell to reduce the risk of heat absorbing portion overflowing from the through hole and contacting the battery cell.

[0020] In some embodiments, along the first direction, the sum of the projected areas of the through-holes disposed on the second surface is S1, and the projected area of ​​the second surface is S2, satisfying 10% ≤ S1 / S2 ≤ 80%. S1 / S2 ≥ 10% can maintain a sufficient size for the through-holes, reducing the risk of undersized through-holes affecting volume adjustment or gas discharge from the heat sink. S1 / S2 ≤ 80% can reduce the risk of oversized through-holes causing leakage from the heat sink. Therefore, when 10% ≤ S1 / S2 ≤ 80%, the through-hole size can achieve both a stable heat absorption process for the heat sink and reduced risk of leakage from the heat sink.

[0021] In some embodiments, the heat conducting portion further comprises a third surface and a fourth surface. Along the first direction, the third surface is disposed opposite the second surface and in contact with the first surface. The fourth surface connects the second and third surfaces, and a through hole is provided on the fourth surface. Providing the through hole on the fourth surface increases the area of ​​the through hole, thereby improving the exhaust and heat dissipation efficiency of the through hole.

[0022] In some embodiments, the heat conducting portion is made of metal or ceramic. By placing the heat conducting portion in a metal or ceramic material, the heat conducting portion exhibits excellent heat resistance and thermal conductivity. When the heat conducting portion is made of ceramic, the heat conducting portion also exhibits excellent heat dissipation performance, thereby enhancing the heat absorption effect of the heat absorbing component.

[0023] In a second aspect, an embodiment of the present application provides a battery, which includes a plurality of battery cells and a plurality of bus assemblies provided by any one embodiment of the first aspect, wherein the bus assemblies electrically connect the plurality of battery cells.

[0024] In some embodiments, the heat-absorbing component includes a heat-absorbing portion made of an endothermic phase change material or an endothermic decomposition material. The weight of the battery cell is A, and the weight of the heat-absorbing portion of the busbar assembly electrically connected to the battery cell is B, satisfying B / A ≥ 1%. When B / A ≥ 1%, the heat-absorbing portion absorbs heat from the busbar assembly, thereby reducing the amount of heat transferred from the busbar assembly to the battery cell. The battery cell absorbs less heat from the busbar assembly, thereby reducing the risk of thermal runaway in the battery cell due to heat absorption from the busbar assembly.

[0025] In a third aspect, an embodiment of the present application provides an electric device, which includes the battery provided by the embodiment of the second aspect, and the battery is used to provide electrical energy to the electric device.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0028] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0029] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0030] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0031] FIG4 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0032] FIG5 is a cross-sectional view taken along line AA of FIG4 ;

[0033] FIG6 is a schematic structural diagram of the confluence assembly in FIG5 ;

[0034] FIG7 is a schematic structural diagram of a busbar assembly provided in some other embodiments of the present application;

[0035] FIG8 is an exploded view of a busbar assembly provided in some embodiments of the present application;

[0036] FIG9 is a cross-sectional view of the heat absorbing component in FIG8;

[0037] FIG10 is a schematic diagram of the structure of batteries provided in some other embodiments of the present application

[0038] In the drawings, the drawings are not drawn to scale.

[0039] Marking instructions: 1-busbar component; 1a-first surface; 2-heat absorbing component; 21-heat absorbing part; 22-heat conducting part; 22a-second surface; 22b-third surface; 22c-fourth surface; 221-accommodating chamber; 222-through hole; 10-busbar assembly; 20-battery cell; 20a-first wall; 201-shell; 2011-shell; 2011a-opening; 2012-end cover; 202-electrode assembly; 2021-ear; 2021a-positive ear; 2021b-negative ear; 203-electrode terminal; 203a-positive electrode terminal; 203b-negative electrode terminal; 30-housing; 301-first part; 302-second part; 100-battery; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0040] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0043] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0047] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0049] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0050] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0051] 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.

[0052] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0053] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0054] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0055] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0056] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0057] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, the metal foil may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. The composite current collector may include a polymer base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy, etc.) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] 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.

[0059] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0061] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0062] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0063] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0064] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0065] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0066] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0067] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0068] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0069] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0070] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0071] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0072] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0073] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0074] In some embodiments, the electrode assembly is a laminate structure.

[0075] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0076] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0077] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0078] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0079] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0080] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0081] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0082] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0083] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0084] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0085] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0086] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0087] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0088] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0089] When multiple battery cells are arranged inside the battery, some battery cells are prone to heat up due to charging and discharging or external environmental factors during the use of the battery. The heat of the battery cells can easily cause the battery cells to expand or even cause thermal runaway of the battery cells, seriously affecting the service life of the battery. When the battery cells heat up or thermal runaway occurs, the battery cells may transfer the heat generated by the heat to adjacent or connected battery cells, thereby affecting the service life of other batteries.

[0090] In the related art, a thermal insulation pad may be provided between adjacent battery cells. The thermal insulation pad may reduce heat transfer between adjacent battery cells and reduce the impact of a heating battery cell on its adjacent battery cells.

[0091] However, in a battery, multiple battery cells are generally electrically connected through a busbar. When a battery cell experiences thermal runaway, the heat of the battery cell may also be transferred to other battery cells through the busbar, causing thermal runaway of other battery cells and affecting the reliability of the battery.

[0092] Based on the above considerations, in order to reduce the impact of thermal runaway of a battery cell on other battery cells, an embodiment of the present application provides a busbar assembly, which includes a busbar component and a heat absorption component. The busbar component connects multiple battery cells, and the heat absorption component connects the busbar component.

[0093] In such a busbar assembly, the busbar component connects multiple battery cells, the busbar component can conduct heat between the battery cells, and the heat absorption component can absorb the heat of the battery cells flowing through the busbar component, thereby improving the problem of excessive heat conducted from the busbar assembly to the battery cells affecting the reliability of the battery.

[0094] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0095] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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.

[0096] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0097] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed within vehicle 1000. Battery 100 can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000, for example, as an operating power source for vehicle 1000.

[0098] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0099] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a bus assembly 10, a plurality of battery cells 20 and a box body 30. The bus assembly 10 is electrically connected to the battery cells 20, and the plurality of battery cells 20 and the bus assembly 10 are accommodated in the box body 30.

[0101] The housing 30 is a component that houses the battery cells 20 and provides a storage space for the battery cells 20. The housing 30 can have various structures. In some embodiments, the housing 30 can include a first portion 301 and a second portion 302, which overlap to define a storage space for the battery cells 20. The first portion 301 and the second portion 302 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 301 can be a hollow structure with one side open, and the second portion 302 can also be a hollow structure with one side open. The open side of the second portion 302 overlaps the open side of the first portion 301, forming the housing 30 with a storage space. Alternatively, the first portion 301 can be a hollow structure with one side open, and the second portion 302 can be a plate-like structure. The second portion 302 overlaps the open side of the first portion 301, forming the housing 30 with a storage space. The first portion 301 and the second portion 302 can be sealed by a sealing element, which can be a sealing ring, sealant, etc.

[0102] In the battery 100, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. Multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection to form a battery 100 module. The multiple battery modules 100 are then connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 30. Alternatively, all battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire unit formed by all battery cells 20 is housed within the housing 30.

[0103] The busbar assembly 10 is used to electrically connect multiple battery cells 20. Multiple battery cells 20 can be connected in parallel, in series, or in mixed series through the busbar assembly 10. In some embodiments, multiple battery cells 20 are connected in parallel, and the positive electrodes of multiple battery cells 20 can be connected through one busbar assembly 10, and the negative electrodes of multiple battery cells 20 can be connected through another busbar assembly 10. In some embodiments, as shown in Figure 2, multiple battery cells 20 are connected in series, and in two adjacent battery cells 20, the positive electrode of one battery cell 20 is connected to the negative electrode of the other battery cell 20 through a busbar assembly 10.

[0104] Please refer to Figure 3, which is an exploded view of a battery cell 20 provided in some embodiments of the present application. In some embodiments, the battery cell 20 may include a housing 201 and an electrode assembly 202, wherein the electrode assembly 202 is accommodated in the housing 201.

[0105] In some embodiments, the housing 201 may include a shell 2011 and an end cover 2012 , wherein the shell 2011 has an opening 2011 a and the end cover 2012 closes the opening 2011 a of the shell 2011 .

[0106] The housing 2011 is a component for accommodating the electrode assembly 202. The housing 2011 can be a hollow structure with an opening 2011a formed at one end, or a hollow structure with openings 2011a formed at opposite ends. The housing 2011 can have various shapes, such as a cylinder or a rectangular parallelepiped. The housing 2011 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0107] The end cap 2012 is a component that seals the opening 2011a of the housing 2011 to isolate the internal environment of the battery cell 20 from the external environment. Together, the end cap 2012 and the housing 2011 define a space for accommodating the electrode assembly 202, electrolyte, and other components. The end cap 2012 can be connected to the housing 2011 by welding or crimping to seal the opening 2011a of the housing 2011. The shape of the end cap 2012 can be compatible with the shape of the housing 201. For example, if the housing 2011 is a rectangular parallelepiped structure, the end cap 2012 can be a rectangular plate-like structure that matches the housing 2011. For another example, if the housing 2011 is a cylindrical structure, the end cap 2012 can be a circular plate-like structure that matches the housing 2011. The end cap 2012 can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The end cap 2012 and the housing 2011 can be made of the same or different materials.

[0108] In an embodiment where the housing 2011 has an opening 2011a formed at one end, one end cap 2012 may be provided. In an embodiment where the housing 2011 has openings 2011a formed at opposite ends, two end caps 2012 may be provided. The two end caps 2012 respectively close the two openings 2011a of the housing 2011, and the two end caps 2012 and the housing 2011 together define a receiving space.

[0109] In some embodiments, the battery cell 20 may further include an electrode terminal 203, which is disposed on the outer casing 201. The electrode terminal 203 is used to electrically connect to the tab 2021 of the electrode assembly 202 to output electrical energy from the battery cell 20. The electrode terminal 203 may be disposed on the shell 2011 of the outer casing 201 or on the end cap 2012 of the outer casing 201. The electrode terminal 203 and the tab 2021 may be directly connected, for example, by direct welding. The electrode terminal 203 and the tab 2021 may also be indirectly connected, for example, by a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0110] As an example, as shown in FIG3 , an opening 2011a is formed at one end of the housing 2011. A single end cap 2012 is provided in the outer shell 201, and each end cap 2012 seals the opening 2011a of the housing 2011. Two electrode terminals 203 are provided on the end cap 2012: a positive electrode terminal 203a and a negative electrode terminal 203b. A positive electrode tab 2021a and a negative electrode tab 2021b are formed on the end of the electrode assembly 202 facing the end cap 2012. The positive electrode terminal 203a is connected to the positive electrode tab 2021a via a current collecting member, while the negative electrode terminal 203b is connected to the negative electrode tab 2021b via another current collecting member. The positive electrode terminal 203a serves as the positive electrode of the battery cell 20, and the negative electrode terminal serves as the negative electrode of the battery cell 20.

[0111] Please refer to Figures 4 and 5. Figure 4 is a schematic structural diagram of a battery 100 provided in some embodiments of the present application, and Figure 5 is a cross-sectional view taken along line AA of Figure 4. Embodiments of the present application provide a busbar assembly 10 comprising a busbar component 1 and a heat sink component 2. Busbar component 1 is used to electrically connect a plurality of battery cells 20. Heat sink component 2 is connected to busbar component 1 and is configured to absorb heat from busbar component 1.

[0112] The busbar component 1 is a component that electrically connects multiple battery cells 20. The busbar component 1 can be in the form of a sheet, a block, or a strip. For example, the busbar component 1 is in the form of a sheet. Along the thickness direction of the busbar component 1, the busbar component 1 has a surface facing the battery cells 20. This surface is in contact with the electrode terminals 203 of the multiple battery cells 20 to achieve electrical connection of the busbar component 1 to the multiple battery cells 20. Here, "multiple" refers to at least two, that is, two or more. In some embodiments, to achieve hybrid connection of multiple battery cells 20, "multiple" refers to at least three, that is, three or more battery cells 20.

[0113] The busbar member 1 may connect two battery cells 20 in series. As an example, as shown in FIG4 , the busbar member 1 connects the positive electrode terminal 203a of one battery cell 20 and the negative electrode terminal 203b of another battery cell 20 to achieve the series connection of the two battery cells 20 .

[0114] Alternatively, the busbar component 1 may connect two battery cells 20 in parallel. For example, the busbar component 1 may connect the positive electrode terminals 203 a of the two battery cells 20 , or the busbar component 1 may connect the negative electrode terminals 203 b of the two battery cells 20 to achieve parallel connection of the two battery cells 20 .

[0115] The number of busbar components 1 can be one, one busbar component 1 connecting two battery cells 20 or one busbar component 1 connecting at least three battery cells 20; the number of busbar components 1 can also be multiple, for example, the battery 100 includes multiple battery cells 20, and each busbar component 1 can connect two battery cells 20 in series.

[0116] The busbar component 1 can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0117] The heat-absorbing component 2 absorbs heat from the converging component 1. The heat-absorbing component 2 can have various structures, including at least one of a heat sink, a water-cooled plate, a thermal decomposition component, and a heat-absorbing phase-change component. A thermal decomposition component is a component that at least partially decomposes after absorbing heat. A heat-absorbing phase-change component is a component that at least partially undergoes a physical change after absorbing heat. For example, the heat-absorbing phase-change component may be solid and then undergo a phase change from solid to liquid or gas.

[0118] The heat absorbing component 2 on the conduit component 1 can be one or more. The heat absorbing component 2 can be connected to the surface of the conduit component 1. Taking the conduit component 1 as a sheet, the heat absorbing component 2 can be connected to the surface of the conduit component 1 facing the battery cell 20 in the thickness direction, or it can be connected to the surface of the conduit component 1 facing away from the battery cell 20 in the thickness direction. The heat absorbing component 2 and the conduit component 1 can be riveted together; they can also be bolted together, for example, by locking the heat absorbing component 2 and the conduit component 1 with a bolt and nut; they can also be bonded together, for example, by connecting the heat absorbing component 2 to the surface of the conduit component 1 with thermally conductive adhesive; or they can be welded together.

[0119] One heat absorbing component 2 may be connected to one conduit component 1, one heat absorbing component 2 may be connected to multiple conduit components 1, or multiple heat absorbing components 2 may be connected to one conduit component 1. When one heat absorbing component 2 is connected to multiple conduit components 1, the connection between the heat absorbing component 2 and the conduit component 1 may be an insulator. For example, the material of the connection between the heat absorbing component 2 and the conduit component 1 is ceramic.

[0120] As an example, as shown in Figure 4, along a first direction X, a battery cell 20 has a first wall 20a. A positive electrode terminal 203a and a negative electrode terminal 203b are disposed on the first wall 20a of the battery cell 20, and the positive electrode terminals 203a and negative electrode terminals 203b are spaced apart along a second direction Y. Two battery cells 20 are arranged along a third direction Z. The busbar assembly 10 extends along the third direction Z, and the busbar component 1 connects the positive electrode terminals 203a of the two battery cells 20, thereby connecting the two battery cells 20 in series. Along the first direction X, the heat sink 2, the busbar component 1, and the battery cells 20 are sequentially arranged, with the first direction X, the second direction Y, and the third direction Z intersecting each other. Spaced apart means that there is a certain distance between them and they are not in contact. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X can be the height of the battery cell 20, the second direction Y can be the width of the battery cell 20, and the third direction Z can be the thickness of the battery cell 20.

[0121] In the above-mentioned busbar assembly 10, the busbar component 1 is connected to multiple battery cells 20, and the heat generated by the multiple battery cells 20 can be transferred through the busbar component 1. The heat absorption component 2 is connected to the busbar component 1, and the heat absorption component 2 can absorb the heat on the busbar component 1. In the process of the busbar component 1 transferring the heat generated by one battery cell 20 to another battery cell 20, the heat absorption component 2 can absorb the heat on the busbar component 1 to reduce the heat transferred from one battery cell 20 to another battery cell 20, thereby improving the reliability of the battery 100.

[0122] In some embodiments, the heat absorbing component 2 includes a heat absorbing portion 21 , and the heat absorbing portion 21 is made of a heat absorbing phase change material or a heat absorbing decomposition material.

[0123] A portion of the heat absorbing component 2 may be the heat absorbing portion 21, that is, the material of a portion of the heat absorbing component 2 is an endothermic phase change material or an endothermic decomposition material; or the entire heat absorbing component 2 may be the heat absorbing portion 21, that is, the material of the heat absorbing component 2 is an endothermic phase change material or an endothermic decomposition material.

[0124] The heat absorbing portion 21 is the component within the heat absorbing member 2 that absorbs heat. The heat absorbing portion 21 within the heat absorbing member 2 may be one or more. The heat absorbing portion 21 may be a filler that fills the interior of the heat absorbing member 2, or a spray coating that is applied to the surface of the heat absorbing member 2.

[0125] Endothermic phase change materials refer to materials that can absorb heat to undergo physical changes. For example, endothermic phase change materials are solid and can change into liquid or gas after absorbing heat. Endothermic decomposition materials refer to materials that can absorb heat to undergo chemical changes. That is, the endothermic decomposition materials produce new substances by absorbing heat to produce chemical reactions.

[0126] In some embodiments, the heat absorption portion 21 may also be a mixture of an endothermic phase change material and an endothermic decomposition material.

[0127] The heat absorbing portion 21 is provided to absorb heat from the busbar 1, thereby reducing the amount of heat transferred from the busbar 1 to the battery cells 20. The heat absorbing portion 21 can undergo a heat-absorbing phase change or decompose to generate a temperature difference between the heat absorbing portion 2 and the busbar 1, thereby absorbing heat from the busbar 1.

[0128] In some embodiments, the endothermic phase change material comprises a ternary carbonate, a nitrate, a fluoride, or a hydrochloride.

[0129] The endothermic phase change material can be one of the materials having endothermic phase change capability among ternary carbonate, nitrate, fluoride or hydrochloride, or a mixture of at least two of the materials having endothermic phase change capability among ternary carbonate, nitrate, fluoride or hydrochloride.

[0130] The ternary carbonate may be prepared by mixing at least lithium carbonate, sodium carbonate and potassium carbonate.

[0131] In some embodiments, the endothermic decomposition material comprises magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate, or lead carbonate.

[0132] The endothermic decomposition material may be at least one of magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate or lead carbonate.

[0133] In some embodiments, referring to Figures 5 and 6, Figure 6 is a schematic structural diagram of the busbar assembly 10 in Figure 5. The heat absorbing component 2 further includes a heat conducting portion 22, at least a portion of which is located between the heat absorbing portion 21 and the busbar assembly 1 to separate the heat absorbing portion 21 and the busbar assembly 1.

[0134] The heat conducting portion 22 is a component that conducts the heat of the converging member 1 to the heat absorbing portion 21. The heat conducting portion 22 can be in the form of a sheet or a block.

[0135] The heat absorbing portion 21 may be attached to the surface of the heat conducting portion 22, or the heat conducting portion 22 may be provided with a placement groove in which the heat absorbing portion 21 is accommodated. The heat conducting portion 22 may be snap-fitted to the converging component 1, or the heat conducting portion 22 may be bonded to the converging component 1.

[0136] The entire heat-conducting portion 22 may be located between the heat-absorbing portion 21 and the confluence component 1; or a portion of the heat-conducting portion 22 may be located between the heat-absorbing portion 21 and the confluence component 1 to separate the heat-absorbing portion 21 and the confluence component 1, and the other portion may be located on one side of the heat-absorbing portion 21 to wrap the heat-absorbing portion 21.

[0137] By providing the heat-conducting portion 22, the heat-conducting portion 22 can conduct heat. By providing at least a portion of the heat-conducting portion 22 between the heat-absorbing portion 21 and the converging component 1, the heat-conducting portion 22 can transfer the heat of the converging component 1 to the heat-absorbing portion 21, so that the heat-absorbing portion 21 absorbs the heat. The heat-conducting portion 22 separates the heat-absorbing portion 21 and the converging component 1, which can reduce the contact between the heat-absorbing portion 21 and the converging component 1, thereby reducing the risk of the heat-absorbing portion 21 affecting the normal use of the converging component 1.

[0138] In some embodiments, the busbar component 1 has a first surface 1 a facing away from the battery cell 20 along the first direction X, the heat conducting portion 22 is in contact with the first surface 1 a , and at least a portion of the heat conducting portion 22 is located between the heat absorbing portion 21 and the busbar component 1 along the first direction X.

[0139] The heat-conducting part 22 may be hot-melt to the first surface 1a; the heat-conducting part 22 may be snap-fitted to the converging component 1 to achieve the adhesion of the heat-conducting part 22 to the first surface 1a; the heat-conducting part 22 and the first surface 1a may be riveted; the heat-conducting part 22 and the first surface 1a may be bolted, for example, the heat-conducting part 22 is adhered to the first surface 1a and then locked by bolts and nuts; the heat-conducting part 22 and the first surface 1a may be adhesively fitted, for example, the heat-conducting part 22 is connected to the surface of the first surface 1a by thermally conductive glue; or the heat-conducting part 22 and the first surface 1a may be welded.

[0140] By attaching the heat-conducting portion 22 to the first surface 1a of the busbar component 1, the heat-conducting portion 22 is facilitated to conduct the heat of the busbar component 1 to the heat-absorbing portion 21. Along the first direction X, by arranging at least a portion of the heat-conducting portion 22 between the heat-absorbing portion 21 and the busbar component 1, the heat-absorbing portion 21 and the busbar component 1 are spaced apart, and the heat-absorbing portion 21 is arranged away from the battery cell 20, thereby reducing the influence of the heat-absorbing portion 21 on the battery cell 20.

[0141] In some embodiments, please continue to refer to FIG6 , a receiving cavity 221 is formed inside the heat conducting portion 22 , and the heat absorbing portion 21 is received in the receiving cavity 221 .

[0142] The accommodating chamber 221 may be a sealed chamber after being filled with the heat conducting portion 22, or the accommodating chamber 221 may remain in communication with the outside world. If the accommodating chamber 221 is a closed chamber, the closed chamber may be a fixed chamber with a constant internal space, or a variable chamber with a variable internal space. In an embodiment in which the heat absorbing portion 21 is an endothermic decomposition material, the closed chamber may be a variable chamber. After the heat absorbing portion 21 decomposes the material, the fluid medium is generated. The fluid medium increases the internal pressure of the closed chamber, thereby increasing the internal space of the closed chamber. The fluid medium may be in a gaseous state or a liquid state.

[0143] The heat-conducting portion 22 is arranged in the heat-absorbing portion 21. When the heat-conducting portion 22 absorbs heat and undergoes phase change or decomposition, the heat-conducting portion 22 is located in the accommodating cavity 221. The heat-conducting portion 22 can be sealed in the accommodating cavity 221, which can reduce the risk of the heat-conducting portion 22 contacting the busbar component 1 or the battery cell 20, thereby improving the reliability of the battery cell 20.

[0144] In some embodiments, the volume of the heat absorption portion 21 is V1, and the volume of the heat conduction portion 22 is V2, satisfying V1 / V2≥1.

[0145] If only one heat absorbing portion 21 is connected to the heat conducting portion 22 , V1 is the volume of the heat absorbing portion 21 . If multiple heat absorbing portions 21 are connected to the heat conducting portion 22 , V1 is the sum of the volumes of the multiple heat absorbing portions 21 .

[0146] By setting V1 / V2≥1, the volume of the heat absorbing portion 21 is not less than the volume of the heat conducting portion 22, thereby reducing the risk of poor heat absorption effect of the heat absorbing component 2. The higher the ratio of the volume of the heat absorbing portion 21 to the volume of the heat absorbing component 2, the more heat the heat absorbing component 2 can absorb, and the better the heat absorption effect.

[0147] In some embodiments, please refer to FIG7 , which is a schematic structural diagram of a busbar assembly 10 provided in some other embodiments of the present application. The heat conducting portion 22 is provided with a through hole 222 , which is in communication with the accommodating cavity 221 .

[0148] The heat conducting portion 22 may have one through hole 222 , which is connected to the accommodating cavity 221 ; or the heat conducting portion 22 may have multiple through holes 222 , which are all connected to the accommodating cavity 221 .

[0149] By providing a through hole 222 on the heat conducting part 22 and connecting the through hole 222 with the accommodating cavity 221, when the heat absorbing part 21 in the heat conducting part 22 is an endothermic phase change material, the volume of the endothermic phase change material changes after absorbing heat, thereby affecting the internal pressure of the accommodating cavity 221. The accommodating cavity 221 can adjust its internal pressure through the through hole 222, thereby reducing the impact of the heat absorption of the heat absorbing part 21 on the heat conducting part 22; when the heat absorbing part 21 in the heat conducting part 22 is an endothermic decomposition material, the endothermic decomposition material can generate gas in the accommodating cavity 221 and discharge the gas from the accommodating cavity 221 through the through hole 222, thereby reducing the impact of the heat absorption of the heat absorbing part 21 on the heat conducting part 22.

[0150] In some embodiments, the busbar component 1 has a first surface 1a away from the battery cell 20 along the first direction X, and the heat conducting portion 22 is in contact with the first surface 1a. Along the first direction X, the heat conducting portion 22 has a second surface 22a away from the first surface 1a, and the second surface 22a is provided with a through hole 222.

[0151] The second surface 22a may be arranged parallel to the first surface 1a, or may be arranged at an acute angle to the first surface 1a. One through hole 222 may be provided on the second surface 22a, or a plurality of through holes 222 may be provided on the second surface 22a.

[0152] As an example, as shown in Figure 7, along the first direction X, a plurality of through holes 222 are opened on the second surface 22a of the heat conducting portion 22. The plurality of through holes 222 are spaced apart on the second surface 22a and are all connected to the accommodating cavity 221. The heat absorbing portion 21 is accommodated in the accommodating cavity 221.

[0153] The through hole 222 is disposed on a side of the heat conducting portion 22 away from the battery cell 20 , thereby reducing the risk of the heat absorbing portion 21 overflowing from the through hole 222 and contacting the battery cell 20 .

[0154] In some embodiments, along the first direction X, the sum of the projected areas of the through holes 222 disposed on the second surface 22 a is S1 , and the projected area of ​​the second surface 22 a is S2 , satisfying 10%≤S1 / S2≤80%.

[0155] S1 / S2 can be any point value of 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% or a range value between any two of them.

[0156] When S1 / S2 is ≥ 10%, the size of the through hole 222 can be kept sufficient, reducing the risk of the heat absorption part 21 adjusting its volume or discharging gas due to the through hole 222 being too small. When S1 / S2 is ≤ 80%, the risk of the heat absorption part 21 leaking due to the through hole 222 being too large can be reduced. Therefore, when 10% ≤ S1 / S2 ≤ 80%, the size of the through hole 222 can take into account both the stability of the heat absorption change process of the heat absorption part 21 and the reduction of the risk of leakage of the heat absorption part 21.

[0157] In some embodiments, referring to Figures 8 and 9 , Figure 8 is an exploded view of a busbar assembly 10 provided in some embodiments of the present application, and Figure 9 is a cross-sectional view of the heat absorbing component in Figure 8 . The heat conducting portion 22 further has a third surface 22b and a fourth surface 22c. Along the first direction X, the third surface 22b is disposed opposite the second surface 22a and is in contact with the first surface 1a. The fourth surface 22c connects the second surface 22a and the third surface 22b. The fourth surface 22c is provided with a through hole 222.

[0158] The third surface 22b is disposed opposite the second surface 22a, meaning that along the first direction X, the projection of the third surface 22b and the projection of the second surface 22a at least partially overlap, and a gap exists between the second surface 22a and the third surface 22b. The second surface 22a can be parallel to the third surface 22b, or the second surface 22a can form an acute angle with the third surface 22b. The entire third surface 22b can be in contact with the entire first surface 1a, or only a portion of the third surface 22b can be in contact with the first surface 1a.

[0159] The fourth surface 22c may be directly connected to the first surface 1a and the third surface 22b, or the fourth surface 22c may be indirectly connected to the first surface 1a and the third surface 22b. For example, the fourth surface 22c and the first surface 1a as well as the fourth surface 22c and the third surface 22b may be connected via chamfered surfaces or curved surfaces.

[0160] The fourth surface 22c may be a single surface of the heat conducting portion 22, or may be multiple surfaces of the heat conducting portion 22. For example, as shown in FIG8 , the heat conducting portion 22 has four fourth surfaces 22c, each of which may be provided with a through-hole 222. When the first direction X is the direction of gravity and the heat conducting portion 22 is located above the flow converging component 1, the through-holes 222 on the fourth surfaces 22c may be provided close to the second surface 22a to reduce the risk of leakage from the heat absorbing portion 21 through the through-holes 222 on the fourth surfaces 22c.

[0161] By providing the through hole 222 on the fourth surface 22 c , the area of ​​the through hole 222 can be increased, thereby improving the exhaust efficiency and heat dissipation efficiency of the through hole 222 .

[0162] In some embodiments, the heat conducting portion 22 is made of metal or ceramic.

[0163] The metal material may be at least one of copper, iron, aluminum, stainless steel and aluminum alloy.

[0164] The ceramic material may be at least one of alumina ceramics, boron nitride ceramics, aluminum boron oxide ceramics, and mullite ceramics.

[0165] By setting the heat conducting portion 22 in metal or ceramic material, the heat conducting portion 22 has good heat resistance and heat conductivity. When the heat conducting portion 22 is made of ceramic material, the heat conducting portion 22 can also have good heat dissipation performance, thereby improving the heat absorption effect of the heat absorbing component 2.

[0166] The present application also provides a battery 100 , as shown in FIG10 , which is a schematic structural diagram of a battery 100 provided in another embodiment of the present application. The battery 100 includes a plurality of battery cells 20 and a busbar assembly 10 , which electrically connects the plurality of battery cells 20 .

[0167] As an example, as shown in FIG. 10 , a plurality of battery cells 20 are arranged along a third direction Z, and two adjacent battery cells 20 are connected in series through a bus assembly 10 to increase the voltage and capacity of the battery 100 .

[0168] In some embodiments, the heat absorption component 2 includes a heat absorption portion 21, the material of the heat absorption portion 21 is an endothermic phase change material or an endothermic decomposition material, the weight of the battery cell 20 is A, and the weight of the heat absorption portion 21 of the bus assembly 10 electrically connected to the battery cell 20 is B, satisfying B / A ≥ 1%.

[0169] As an example, an endothermic phase change material made of a ternary carbonate primarily composed of lithium carbonate, sodium carbonate, and potassium carbonate can be used as the heat absorbing portion 21, or an endothermic phase change material primarily composed of lithium carbonate can be used as the heat absorbing portion 21. Two battery cells 20 are connected via a busbar assembly 10 containing both of these heat absorbing portions 21. Multiple B / A ratio samples were set up, and when one of the two battery cells 20 experienced thermal runaway, the effects of heat transferred by the different B / A ratio samples on the adjacent battery cells were studied. The data shown in Table 1 were obtained:

[0170] Table 1

[0171] An endothermic decomposition material composed primarily of zinc carbonate can be used as the heat absorbing portion 21, and two battery cells 20 can be connected via a busbar assembly 10 containing the heat absorbing portion 21. Multiple B / A ratio samples were set up, and when one of the two battery cells 20 experienced thermal runaway, the effects of heat transferred by the different B / A ratio samples on the adjacent battery cells were studied. The data shown in Table 2 were obtained:

[0172] Table 2

[0173] Referring to Table 1, by comparing Examples 1-5 with Comparative Examples 6-10, it can be found that in the bus assembly 10 in which the heat absorption portion 21 is made of ternary carbonate (lithium carbonate, sodium carbonate, and potassium carbonate) or lithium carbonate as the main component, when B / A is less than 1%, thermal runaway is likely to occur in adjacent battery cells, and when B / A is ≥1%, thermal runaway is unlikely to occur in adjacent battery cells.

[0174] Referring to Table 2, by comparing Examples 11-15 with Comparative Examples 16-20, it can be found that in the busbar assembly 10 in which the heat absorption portion 21 is made of zinc carbonate or sodium nitrate as the main component, when B / A is less than 1%, thermal runaway is likely to occur between adjacent battery cells, and when B / A is ≥1%, thermal runaway is unlikely to occur between adjacent battery cells.

[0175] When B / A ≥ 1%, the heat absorption portion 21 absorbs the heat of the busbar component 1, thereby reducing the heat transferred from the busbar component 1 to the battery cell 20. The battery cell 20 absorbs less heat from the busbar component 1, thereby reducing the risk of thermal runaway of the battery 100 due to absorbing heat from the busbar component 10.

[0176] An embodiment of the present application provides an electrical device, which includes a battery provided by any one of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0177] Referring to Figure 7 , an embodiment of the present application further provides a convergence assembly 10, comprising a convergence component 1 and a heat absorbing component 2, arranged along a first direction X. The heat absorbing component 2 comprises a heat absorbing portion 21 and a heat conducting portion 22, wherein the heat conducting portion 22 is provided with a receiving cavity 221. The heat absorbing portion 21 is disposed within the receiving cavity 221, and a through hole 222 is provided at the top of the heat conducting portion 22 along the first direction X, communicating with the receiving cavity 221. The heat absorbing portion 21 may be made of an endothermic phase change material or an endothermic decomposition material. The endothermic phase change material may be a ternary carbonate composed primarily of lithium carbonate, sodium carbonate, and potassium carbonate; the endothermic decomposition material may be primarily composed of zinc carbonate. The first direction X may be the direction of gravity.

[0178] By providing a heat conducting portion 22 at the top of the conduit assembly 1 and a heat absorbing portion 21 within the heat conducting portion 22, the heat absorbing portion 21 can absorb heat from the conduit assembly 1 through the heat conducting portion 22. The heat absorbing portion 21 is housed within the accommodating cavity 221, reducing the risk of the heat absorbing portion 21 contacting the conduit assembly 1 or the battery cells 20. A through hole 222 is provided at the top of the heat conducting portion 22 and communicates with the accommodating cavity 221. When the heat absorbing portion 21 changes, the accommodating cavity 221 balances pressure with the exterior of the heat conducting portion 22 through the through hole 222, reducing the risk of damage to the heat conducting portion 22 due to heat absorption expansion of the heat absorbing portion 21 within the accommodating cavity 221. The through hole 222 provided at the top of the heat conducting portion 22 reduces the risk of the heat absorbing portion 21 contacting the conduit assembly 1 or the battery cells 20.

[0179] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A busbar assembly, comprising: A busbar component for electrically connecting a plurality of battery cells; A heat absorption component connected to the busbar component, the heat absorption component being configured to absorb heat of the busbar component.

2. The bus bar assembly according to claim 1, wherein, The heat absorption component includes a heat absorption portion, and the material of the heat absorption portion is a heat-absorbing phase change material or a heat-absorbing decomposition material.

3. The bus bar assembly according to claim 2, wherein, The heat-absorbing phase change material includes ternary carbonate, nitrate, fluoride salt or hydrochloride salt.

4. The busbar assembly according to claim 2, wherein, The heat-absorbing decomposition material includes magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate or lead carbonate.

5. The bus bar assembly according to any one of claims 2-4, wherein, The heat absorption component further includes a heat conduction portion, and at least a part of the heat conduction portion is located between the heat absorption portion and the busbar component to separate the heat absorption portion and the busbar component.

6. The busbar assembly according to claim 5, wherein, The busbar component has a first surface facing away from the battery cells in a first direction, the heat conduction portion is attached to the first surface, and in the first direction, at least a part of the heat conduction portion is located between the heat absorption portion and the busbar component.

7. The busbar assembly according to claim 5 or 6, wherein A receiving cavity is formed inside the heat conduction portion, and the heat absorption portion is received in the receiving cavity.

8. The busbar assembly according to claim 7, wherein, The volume of the heat absorption portion is V1, and the volume of the heat conduction portion is V2, satisfying V1 / V2≥1.

9. The bus bar assembly according to claim 7 or 8, wherein The heat conduction portion is provided with through holes, and the through holes communicate with the receiving cavity.

10. The busbar assembly according to claim 9, wherein, The busbar component has a first surface facing away from the battery cells in a first direction, the heat conduction portion is attached to the first surface, and in the first direction, the heat conduction portion has a second surface facing away from the first surface, and the through holes are provided on the second surface.

11. The busbar assembly according to claim 10, wherein, In the first direction, the sum of the projected areas of the through holes provided on the second surface is S1, and the projected area of the second surface is S2, satisfying 10%≤S1 / S2≤80%.

12. The bus bar assembly according to claim 10 or 11, wherein, The heat conduction portion further has a third surface and a fourth surface. In the first direction, the third surface is disposed opposite to the second surface, the third surface is attached to the first surface, the fourth surface connects the second surface and the third surface, and the through holes are provided on the fourth surface.

13. The busbar assembly according to any one of claims 5-12, wherein, The heat conduction portion is made of a metal material or a ceramic material.

14. A battery, comprising a plurality of battery cells and the busbar assembly according to any one of claims 1-13, the busbar assembly electrically connecting the plurality of battery cells.

15. The battery according to claim 14, wherein, The heat absorption component includes a heat absorption portion, and the material of the heat absorption portion is a heat-absorbing phase change material or a heat-absorbing decomposition material. The weight of the battery cell is A, and the weight of the heat absorption portion of the busbar assembly electrically connected to the battery cell is B, satisfying B / A≥1%.

16. An electrical device, the electrical device includes the battery according to claim 14 or 15, and the battery is used to provide electrical energy for the electrical device.

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