Convergence assembly, battery and electric equipment

Abstract

The embodiment of the utility model provides a bus assembly, a battery and electric equipment. The confluence assembly comprises a confluence component and a heat absorption component, wherein the confluence component is used for electrically connecting a plurality of battery monomers; the heat absorption component is connected to the confluence component and configured to absorb heat of the confluence component. In the process that the confluence component transfers heat generated by one battery monomer to another battery monomer, the heat absorption component can absorb the heat on the confluence component so as to reduce the heat transferred from one battery monomer to another battery monomer, so that the reliability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a busbar assembly, a battery and an electrical device. Background Art

[0002] The batteries used most 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.

[0003] A battery generally includes a plurality of battery cells and a busbar assembly, and the busbar assembly is used to realize electrical connection between the plurality of battery cells.

[0004] For general batteries, the heat generated by one battery cell is conducted to another battery cell through the busbar assembly. Excessive conducted heat 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. Utility Model Content

[0005] The embodiments of the present application provide a busbar assembly, a battery and an electrical device to improve the problem that the busbar assembly conducts excessive heat to the battery cells, thereby affecting the reliability of the battery.

[0006] In a first aspect, an embodiment of the present application provides a busbar assembly, which includes 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 is configured to absorb heat from the busbar component.

[0007] 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 to reduce the heat transferred from one battery cell to another battery cell, thereby improving the reliability of the battery cells.

[0008] In some embodiments, the heat absorbing component includes a heat absorbing portion, and the material of the heat absorbing portion is a heat absorbing phase change material or a heat absorbing decomposition material. By setting the heat absorbing portion, the heat absorbing portion can absorb the heat of the converging component, thereby reducing the heat transferred from the converging component to the battery cell. The heat absorbing portion can undergo a heat absorbing phase change or the heat absorbing portion can undergo a heat absorbing decomposition to generate a temperature difference between the heat absorbing component and the converging component, thereby achieving heat absorption of the converging component by the heat absorbing component.

[0009] In some embodiments, the endothermic phase change material comprises a ternary carbonate, a nitrate, a fluoride salt, or a hydrochloride salt.

[0010] In some embodiments, the endothermic decomposition material includes magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate, or lead carbonate.

[0011] In some embodiments, the heat absorbing component further comprises a heat conducting portion, at least a portion of which is located between the heat absorbing component and the converging component to separate the heat absorbing component and the converging component. By providing the heat conducting portion, the heat conducting portion can conduct heat, and by providing at least a portion of the heat conducting portion between the heat absorbing component and the converging component, the heat conducting portion can transfer the heat of the converging component to the heat absorbing portion, so that the heat absorbing portion absorbs heat. The heat conducting portion separates the heat absorbing portion and the converging component, which can reduce the risk of the heat absorbing portion contacting the converging component, thereby reducing the risk of the heat absorbing portion affecting the normal use of the converging component.

[0012] In some embodiments, the converging component has a first surface facing away from the battery cell along the first direction, the heat conducting portion is attached to the first surface, and at least a portion of the heat conducting portion is located between the heat absorbing portion and the converging component along the first direction. By attaching the heat conducting portion to the first surface of the converging component, the heat conducting portion is conducive to transferring the heat of the converging component to the heat absorbing portion. By arranging at least a portion of the heat conducting portion between the heat absorbing portion and the converging component along the first direction, the heat absorbing portion and the converging component are arranged at intervals, and the heat absorbing portion is arranged away from the battery cell, thereby reducing the influence of the heat absorbing portion on the battery cell.

[0013] In some embodiments, a receiving cavity is formed inside the heat conducting part, and the heat absorbing part is received in the receiving cavity. The heat conducting part is disposed inside the heat absorbing part, and when the heat conducting part undergoes phase change or decomposes during heat absorption, the heat conducting part is located in the receiving cavity, which can reduce the risk of the heat conducting part contacting the current collecting component or the battery cell, thereby improving the reliability of the battery cell.

[0014] In some embodiments, the volume of the heat absorbing part is V1, and the volume of the heat conducting part is V2, satisfying V1 / V2≥1. By setting V1 / V2≥1, the volume of the heat absorbing part is not less than the volume of the heat conducting part, so as to reduce the risk of poor heat absorption effect of the heat absorbing component. The higher the ratio of the volume of the heat absorbing part to the volume of the heat absorbing component, the higher the heat that can be absorbed by the heat absorbing component, and the better the heat absorption effect.

[0015] In some embodiments, the heat conducting part is provided with a through hole, which is connected to the accommodating cavity. By providing a through hole on the heat conducting part and connecting the through hole to the accommodating cavity, when the heat absorbing part in the heat conducting part is an endothermic phase change material, the volume of the endothermic phase change material changes after absorbing heat, which affects the internal pressure of the accommodating cavity, and the accommodating cavity can adjust its internal pressure through the through hole to reduce the influence of the heat absorbing part on the heat conducting part; when the heat absorbing part in the heat conducting part is an endothermic decomposition material, the endothermic decomposition material can generate gas in the accommodating cavity, and discharge the gas from the accommodating cavity through the through hole, thereby reducing the influence of the heat absorbing part on the heat conducting part.

[0016] In some embodiments, the current collecting component has a first surface facing away from the battery cell along the first direction, the heat conducting portion is in contact with the first surface, and along the first direction, the heat conducting portion has a second surface facing away from the first surface, and the second surface is provided with a through hole. The through hole is provided on the side of the heat conducting portion away from the battery cell, reducing the risk of the heat absorbing portion overflowing from the through hole and contacting the battery cell.

[0017] 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 keep the size of the through hole at a sufficient size, reducing the risk of affecting the heat absorbing part to adjust the volume or discharge gas due to the through hole being too small; S1 / S2≤80% can reduce the risk of the heat absorbing part leaking due to the through hole being too large. Therefore, when 10%≤S1 / S2≤80%, the size of the through hole can take into account both the stability of the heat absorption change process of the heat absorbing part and the reduction of the risk of leakage of the heat absorbing part.

[0018] In some embodiments, the heat conducting portion further has a third surface and a fourth surface, along the first direction, the third surface is arranged opposite to the second surface, the third surface is in contact with the first surface, the fourth surface connects the second surface and the third surface, and the fourth surface is provided with a through hole. By providing a through hole on the fourth surface, the area of ​​the through hole can be increased, thereby improving the exhaust efficiency and heat dissipation efficiency of the through hole.

[0019] In some embodiments, the heat conducting part is a metal material or a ceramic material. By setting the heat conducting part on the metal material or the ceramic material, the heat conducting part has good heat resistance and thermal conductivity. When the heat conducting part is a ceramic material, the heat conducting part can also have good heat dissipation performance, thereby improving the heat absorption effect of the heat absorbing component.

[0020] 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 of the embodiments in the first aspect, wherein the bus assemblies electrically connect the plurality of battery cells.

[0021] In some embodiments, the heat absorbing component includes a heat absorbing portion, the material of the heat absorbing portion is a heat absorbing phase change material or a heat absorbing decomposition material, the weight of the battery cell is A, the weight of the heat absorbing portion of the busbar assembly electrically connected to the battery cell is B, and B / A≥1%. When B / A≥1%, the heat absorbing portion absorbs the heat of the busbar assembly, thereby reducing the heat transferred from the busbar assembly to the battery cell, and the battery cell absorbs less heat from the busbar assembly, thereby reducing the risk of thermal runaway of the battery cell due to the absorption of heat from the busbar assembly.

[0022] In a third aspect, an embodiment of the present application provides an electrical device, which includes the battery provided by the embodiment of the second aspect, and the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0025] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0026] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0027] Figure 4 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0028] Figure 5 for Figure 4 AA section view;

[0029] Figure 6 for Figure 5 A schematic diagram of the structure of the confluence component in FIG.

[0030] Figure 7 A schematic diagram of the structure of a busbar assembly provided in some other embodiments of the present application;

[0031] Figure 8 An exploded view of a busbar assembly provided in some embodiments of the present application;

[0032] Fig. 9 for Figure 8 A cross-sectional view of a heat absorbing component in FIG.

[0033] Fig.10 Schematic diagram of the structure of batteries provided in some other embodiments of the present application.

[0034] Icons: 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

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0037] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0040] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0041] The term "plurality" used in the present application refers to two or more (including two).

[0042] 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.

[0043] 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, and the like.

[0044] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0045] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0046] 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 disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0047] 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 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.).

[0048] 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 positive electrode active materials for batteries can also be used. These positive electrode active materials can 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 NCM 622 )、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 0.05O2) and its modified compounds, etc.

[0049] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0050] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0051] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base 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 and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] 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.

[0053] 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 disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0054] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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.

[0055] 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.

[0056] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0057] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0058] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0059] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0060] 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 dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0061] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl 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.

[0062] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0063] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0064] 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, and the like.

[0065] 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.

[0066] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0067] 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.

[0068] In some embodiments, the electrode assembly is a laminate structure.

[0069] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0070] 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.

[0071] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0072] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0073] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0074] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0075] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0076] In some embodiments, the 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 (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0077] 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. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0078] 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.

[0079] 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.

[0080] 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 accommodated in the case.

[0081] 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.

[0082] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0083] When multiple battery cells are arranged inside the battery, some of the battery cells are prone to generate heat 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 and even cause thermal runaway of the battery cells, seriously affecting the service life of the battery. When the battery cells generate heat 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.

[0084] In the related art, a thermal insulation pad may be disposed between adjacent battery cells, and the thermal insulation pad may reduce heat transfer between adjacent battery cells and reduce the influence of a heating battery cell on its adjacent battery cells.

[0085] However, in a battery, multiple battery cells are generally electrically connected through a busbar. When a battery cell thermally runs away, 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.

[0086] 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.

[0087] 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.

[0088] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0089] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0090] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0091] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100 inside, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0092] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0093] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0094] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application, wherein the battery 100 includes a bus assembly 10, a plurality of battery cells 20 and a housing 30, wherein 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 housing 30.

[0095] Among them, the box body 30 is a component for accommodating the battery cell 20. The box body 30 provides a storage space for the battery cell 20. The box body 30 can adopt a variety of structures. In some embodiments, the box body 30 may include a first part 301 and a second part 302, and the first part 301 and the second part 302 cover each other to define a storage space for accommodating the battery cell 20. The first part 301 and the second part 302 may be in a variety of shapes, such as a cuboid, a cylinder, etc. The first part 301 may be a hollow structure with one side open, and the second part 302 may also be a hollow structure with one side open, and the open side of the second part 302 covers the open side of the first part 301, so as to form a box body 30 with a storage space. It is also possible that the first part 301 is a hollow structure with one side open, and the second part 302 is a plate-like structure, and the second part 302 covers the open side of the first part 301, so as to form a box body 30 with a storage space. The first part 301 and the second part 302 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0096] In the battery 100, multiple battery cells 20 can be connected in series, in parallel or in hybrid connection. Hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be connected in series, in parallel or in hybrid connection to form a battery 100 module, and multiple battery 100 modules can be connected in series, in parallel or in hybrid connection to form a whole and accommodated in the box 30. Alternatively, all battery cells 20 can be directly connected in series, in parallel or in hybrid connection, and then the whole formed by all battery cells 20 can be accommodated in the box 30.

[0097] The busbar assembly 10 is used to realize the electrical connection of multiple battery cells 20. Multiple battery cells 20 can be connected in parallel, in series, or in mixed connection through the busbar assembly 10. In some embodiments, multiple battery cells 20 are connected in parallel, 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 Figure 2 As shown, a plurality of 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 another battery cell 20 via a busbar assembly 10 .

[0098] Please refer to Figure 3 , Figure 3 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 .

[0099] In some embodiments, the housing 201 may include a shell 2011 and an end cap 2012 , wherein the shell 2011 has an opening 2011 a , and the end cap 2012 closes the opening 2011 a of the shell 2011 .

[0100] The housing 2011 is a component for accommodating the electrode assembly 202. The housing 2011 may be a hollow structure with an opening 2011a formed at one end, or a hollow structure with openings 2011a formed at two opposite ends. The housing 2011 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The housing 2011 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0101] The end cap 2012 is a component that closes the opening 2011a of the shell 2011 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 2012 and the shell 2011 together define a receiving space for accommodating the electrode assembly 202, the electrolyte and other components. The end cap 2012 can be connected to the shell 2011 by welding or crimping to close the opening 2011a of the shell 2011. The shape of the end cap 2012 can be adapted to the shape of the shell 201. For example, the shell 2011 is a rectangular parallelepiped structure, and the end cap 2012 is a rectangular plate structure adapted to the shell 201. For another example, the shell 2011 is a cylindrical structure, and the end cap 2012 is a circular plate structure adapted to the shell 2011. The material of the end cap 2012 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 2012 and the shell 2011 can be the same or different.

[0102] In the embodiment where the housing 2011 forms an opening 2011a at one end, one end cap 2012 may be provided. In the embodiment where the housing 2011 forms openings 2011a at two opposite ends, two end caps 2012 may be provided, and 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.

[0103] In some embodiments, the battery cell 20 may further include an electrode terminal 203, which is disposed on the housing 201, and is used to electrically connect to the tab 2021 of the electrode assembly 202 to output the electrical energy of the battery cell 20. The electrode terminal 203 may be disposed on the shell 2011 of the housing 201, or may be disposed on the end cover 2012 of the housing 201. The electrode terminal 203 and the tab 2021 may be directly connected, for example, the electrode terminal 203 and the tab 2021 are directly welded. The electrode terminal 203 and the tab 2021 may also be indirectly connected, for example, the electrode terminal 203 and the tab 2021 are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0104] As an example, Figure 3 As shown, an opening 2011a is formed at one end of the shell 2011, and there is one end cap 2012 in the shell 201, and one end cap 2012 closes one opening 2011a of the shell 2011. Two electrode terminals 203 are provided on the end cap 2012, and the two electrode terminals 203 are respectively a positive electrode terminal 203a and a negative electrode terminal 203b. A positive electrode ear 2021a and a negative electrode ear 2021b are formed at one end of the electrode assembly 202 facing the end cap 2012, and the positive electrode terminal 203a is connected to the positive electrode ear 2021a through a current collecting component, and the negative electrode terminal 203b is connected to the negative electrode ear 2021b through another current collecting component. Among them, the positive electrode terminal 203a is the positive electrode of the battery cell 20, and the negative electrode terminal is the negative electrode of the battery cell 20.

[0105] Please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of a battery 100 provided in some embodiments of the present application. Figure 5 for Figure 4 AA cross-sectional view of the embodiment of the present application provides a busbar assembly 10, which includes a busbar component 1 and a heat absorbing component 2. The busbar component 1 is used to electrically connect a plurality of battery cells 20. The heat absorbing component 2 is connected to the busbar component 1, and the heat absorbing component 2 is configured to absorb heat from the busbar component 1.

[0106] 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 cell 20, and the surface is attached to the electrode terminals 203 of the multiple battery cells 20 to achieve the busbar component 1 electrically connecting multiple battery cells 20. Among them, multiple refers to at least two, that is, two or more. In some embodiments, in order to achieve the hybrid connection of multiple battery cells 20, multiple refers to at least three, that is, three or more battery cells 20 are hybrid connected.

[0107] The busbar component 1 may be connected in series with two battery cells 20. As an example, Figure 4 As shown, the busbar member 1 connects the positive electrode terminal 203 a of one battery cell 20 and the negative electrode terminal 203 b of another battery cell 20 to achieve series connection of the two battery cells 20 .

[0108] The busbar component 1 may also connect two battery cells 20 in parallel. For example, the busbar component 1 connects the positive electrode terminals 203 a of the two battery cells 20 , or the busbar component 1 connects the negative electrode terminals 203 b of the two battery cells 20 to achieve parallel connection of the two battery cells 20 .

[0109] The number of busbar components 1 can be one, one busbar component 1 connects two battery cells 20 or one busbar component 1 connects 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.

[0110] The busbar component 1 may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0111] The heat absorbing component 2 is a component that absorbs the heat of the converging component 1. The heat absorbing component 2 can be a variety of structures, and the heat absorbing component 2 can include at least one of a heat sink, a water cooling plate, a thermal decomposition component, and a heat absorbing phase change component. The thermal decomposition component is a component that at least partially decomposes after absorbing heat. The 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 is solid, and after the heat absorbing phase change component absorbs heat, the heat absorbing phase change component changes from solid to liquid or gas.

[0112] 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 away from the battery cell 20 in the thickness direction. The heat absorbing component 2 and the conduit component 1 can be riveted together; or the heat absorbing component 2 and the conduit component 1 can be bolted together, for example, the heat absorbing component 2 and the conduit component 1 are locked by bolts and nuts; or the heat absorbing component 2 and the conduit component 1 can be bonded together, for example, the heat absorbing component 2 is connected to the surface of the conduit component 1 by thermally conductive glue; or the heat absorbing component 2 and the conduit component 1 can be welded together.

[0113] It can be that one heat absorbing component 2 is connected to one conduit component 1, one heat absorbing component 2 is connected to multiple conduit components 1, or multiple heat absorbing components 2 are 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 can be an insulator, for example, the material of the connection between the heat absorbing component 2 and the conduit component 1 is ceramic.

[0114] As an example, Figure 4 As shown, along the first direction X, the battery cell 20 has a first wall 20a, and the first wall 20a of the battery cell 20 is provided with a positive electrode terminal 203a and a negative electrode terminal 203b, and the positive electrode terminal 203a and the negative electrode terminal 203b are arranged at intervals along the second direction Y; two battery cells 20 are arranged along the third direction Z, the bus assembly 10 extends along the third direction Z, and the bus component 1 connects the positive electrode terminals 203a of the two battery cells 20, so that the two battery cells 20 are connected in series. Along the first direction X, the heat absorption component 2, the bus component 1 and the battery cell 20 are arranged in sequence, and the first direction X, the second direction Y and the third direction Z intersect each other. Among them, the interval arrangement means that there is no contact between the two and there is a certain distance; 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 direction of the battery cell 20, the second direction Y can be the width direction of the battery cell 20, and the third direction Z can be the thickness direction of the battery cell 20.

[0115] 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 the above-mentioned battery cell 20 to another battery cell 20, thereby improving the reliability of the battery 100.

[0116] 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.

[0117] 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.

[0118] The heat absorbing part 21 refers to a part that absorbs heat in the heat absorbing component 2. The number of the heat absorbing parts 21 in the heat absorbing component 2 can be one or more. The heat absorbing part 21 can be a filler, and the heat absorbing part 21 is filled in the interior of the heat absorbing component 2; the heat absorbing part 21 can also be a spraying material, and the heat absorbing part 21 is coated on the surface of the heat absorbing component 2.

[0119] Endothermic phase change material refers to a material that can absorb heat to undergo physical changes. For example, the endothermic phase change material is solid and can become liquid or gas after absorbing heat. Endothermic decomposition material refers to a material that can absorb heat to undergo chemical changes. That is, the endothermic decomposition material produces new substances by absorbing heat to undergo chemical reactions.

[0120] In some embodiments, the heat absorption portion 21 may also be a mixture of an endothermic phase change material and an endothermic decomposition material.

[0121] By providing the heat absorbing portion 21, the heat absorbing portion 21 can absorb the heat of the busbar component 1, thereby reducing the heat transferred from the busbar component 1 to the battery cell 20. The heat absorbing portion 21 can undergo an endothermic phase change or the heat absorbing portion 21 can endothermic decomposition to generate a temperature difference between the heat absorbing portion 2 and the busbar component 1, thereby achieving heat absorption of the busbar component 1 by the heat absorbing portion 2.

[0122] In some embodiments, the endothermic phase change material comprises a ternary carbonate, a nitrate, a fluoride salt, or a hydrochloride salt.

[0123] The endothermic phase change material can be one of the materials having endothermic phase change capability among ternary carbonates, nitrates, fluorides or hydrochlorides, or a mixture of at least two of the materials having endothermic phase change capability among ternary carbonates, nitrates, fluorides or hydrochlorides.

[0124] The ternary carbonate may be prepared by mixing at least lithium carbonate, sodium carbonate and potassium carbonate.

[0125] In some embodiments, the endothermic decomposition material includes magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate, or lead carbonate.

[0126] The endothermic decomposition material may be at least one of magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate or lead carbonate.

[0127] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 6 for 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 converging component 1 to separate the heat absorbing portion 21 and the converging component 1.

[0128] The heat conducting part 22 is a part that conducts the heat of the converging member 1 to the heat absorbing part 21. The heat conducting part 22 may be in a sheet shape or a block shape.

[0129] The heat absorbing part 21 may be attached to the surface of the heat conducting part 22, or the heat conducting part 22 may be provided with a placement groove, and the heat absorbing part 21 may be accommodated in the placement groove. The heat conducting part 22 may be clamped with the converging component 1, or the heat conducting part 22 may be bonded to the converging component 1.

[0130] The entire heat conducting part 22 may be located between the heat absorbing part 21 and the conduit component 1; or a portion of the heat conducting part 22 may be located between the heat absorbing part 21 and the conduit component 1 to separate the heat absorbing part 21 and the conduit component 1, and the other portion may be located on one side of the heat absorbing part 21 to wrap the heat absorbing part 21.

[0131] 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.

[0132] In some embodiments, the busbar component 1 has a first surface 1 a 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 along the first direction X, at least a portion of the heat conducting portion 22 is located between the heat absorbing portion 21 and the busbar component 1 .

[0133] The heat-conducting part 22 may be hot-melted to the first surface 1a; the heat-conducting part 22 may be snap-fitted to the collector 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 matched, for example, the heat-conducting part 22 is connected to the surface of the first surface 1a by thermally conductive glue; the heat-conducting part 22 and the first surface 1a may be welded.

[0134] 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 disposing 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 disposed away from the battery cell 20, thereby reducing the influence of the heat absorbing portion 21 on the battery cell 20.

[0135] In some embodiments, please refer to Figure 6The heat conducting portion 22 has an accommodating cavity 221 formed therein, and the heat absorbing portion 21 is accommodated in the accommodating cavity 221 .

[0136] The accommodating chamber 221 may be a closed chamber in a sealed state after being filled with the heat conducting part 22, or the accommodating chamber 221 may be in communication with the outside. 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 the embodiment where the heat absorbing part 21 is an endothermic decomposition material, the closed chamber may be a variable chamber, and the heat absorbing part 21 generates a fluid medium after endothermic decomposition, and the fluid medium increases the internal pressure of the closed chamber, thereby enlarging the internal space of the closed chamber. The fluid medium may be in a gaseous state or in a liquid state.

[0137] The heat conducting part 22 is arranged in the heat absorbing part 21. When the heat conducting part 22 absorbs heat and undergoes phase change or decomposes, the heat conducting part 22 is located in the accommodating cavity 221. The heat conducting part 22 can be sealed in the accommodating cavity 221, which can reduce the risk of the heat conducting part 22 contacting the busbar component 1 or the battery cell 20, thereby improving the reliability of the battery cell 20.

[0138] 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.

[0139] If there is only one heat absorbing part 21 connected to the heat conducting part 22, V1 is the volume of the heat absorbing part 21. If there are multiple heat absorbing parts 21 connected to the heat conducting part 22, V1 is the sum of the volumes of the multiple heat absorbing parts 21.

[0140] By setting V1 / V2≥1, the volume of the heat absorbing part 21 is not less than the volume of the heat conducting part 22, so as to reduce the risk of poor heat absorption effect of the heat absorbing component 2. The higher the ratio of the volume of the heat absorbing part 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.

[0141] In some embodiments, please refer to Figure 7 , Figure 7 The schematic diagram of the structure of the busbar assembly 10 provided in some embodiments of the present application is as follows: The heat conducting portion 22 is provided with a through hole 222 , and the through hole 222 is communicated with the accommodating cavity 221 .

[0142] The heat conducting part 22 may have one through hole 222 , which is connected to the accommodating cavity 221 ; or the heat conducting part 22 may have multiple through holes 222 , which are all connected to the accommodating cavity 221 .

[0143] By providing a through hole 222 on the heat conducting part 22 and connecting the through hole 222 with the accommodating chamber 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 chamber 221. The accommodating chamber 221 can adjust its internal pressure through the through hole 222 to reduce the influence 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 chamber 221, and discharge the gas from the accommodating chamber 221 through the through hole 222, thereby reducing the influence of the heat absorption of the heat absorbing part 21 on the heat conducting part 22.

[0144] 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 conductive portion 22 is in contact with the first surface 1a. Along the first direction X, the heat conductive 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.

[0145] 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 arranged on the second surface 22a, or a plurality of through holes 222 may be arranged on the second surface 22a.

[0146] As an example, Figure 7 As shown, along the first direction X, a plurality of through holes 222 are provided on the second surface 22 a of the heat conducting portion 22 . The plurality of through holes 222 are spaced apart on the second surface 22 a and are all connected to the accommodating cavity 221 . The heat absorbing portion 21 is accommodated in the accommodating cavity 221 .

[0147] The through hole 222 is disposed on a side of the heat conducting portion 22 away from the battery cell 20 , so as to reduce the risk of the heat absorbing portion 21 overflowing from the through hole 222 and contacting the battery cell 20 .

[0148] 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%.

[0149] 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.

[0150] S1 / S2≥10% can keep the size of the through hole 222 at a sufficient size, reducing the risk of the heat absorption part 21 adjusting the volume or exhausting the gas due to the through hole 222 being too small; S1 / S2≤80% can reduce the risk of the heat absorption part 21 leaking due to the through hole 222 being too large. Therefore, when 10%≤S1 / S2≤80%, the size of the through hole 222 can take into account the stability of the heat absorption change process of the heat absorption part 21 and reduce the risk of leakage of the heat absorption part 21.

[0151] In some embodiments, please refer to Figure 8 and Fig. 9 , Figure 8 An exploded view of a busbar assembly 10 provided in some embodiments of the present application, Fig. 9 for Figure 8 The heat conducting portion 22 further comprises a third surface 22b and a fourth surface 22c. Along the first direction X, the third surface 22b is arranged opposite to the second surface 22a. The third surface 22b 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.

[0152] The third surface 22b is arranged relative to the second surface 22a, which means 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 there is a gap between the second surface 22a and the third surface 22b. The second surface 22a may be parallel to the third surface 22b, or the second surface 22a may be at an acute angle to the third surface 22b. The entire third surface 22b may be in contact with the entire first surface 1a, or only a portion of the third surface 22b may be in contact with the first surface 1a.

[0153] 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 a chamfered surface or an arc surface.

[0154] One surface of the heat conducting portion 22 may be the fourth surface 22c, or multiple surfaces of the heat conducting portion 22 may be the fourth surface 22c. For example, Figure 8 As shown, the heat conducting part 22 has four fourth surfaces 22c, and each of the four fourth surfaces 22c can be provided with a through hole 222. When the first direction X is the gravity direction and the heat conducting part 22 is located above the converging component 1, the through holes 222 on the fourth surface 22c can be provided close to the second surface 22a to reduce the risk of the heat absorbing part 21 leaking from the through holes 222 on the fourth surface 22c.

[0155] 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 .

[0156] In some embodiments, the heat conducting portion 22 is made of metal material or ceramic material.

[0157] The metal material may be at least one of copper, iron, aluminum, stainless steel and aluminum alloy.

[0158] The ceramic material may be at least one of alumina ceramics, boron nitride ceramics, aluminum boron oxide ceramics, and mullite ceramics.

[0159] By setting the heat conducting part 22 in metal material or ceramic material, the heat conducting part 22 has good heat resistance and thermal conductivity. When the heat conducting part 22 is made of ceramic material, the heat conducting part 22 can also have good heat dissipation performance, thereby improving the heat absorption effect of the heat absorbing component 2.

[0160] The present application also provides a battery 100, please refer to Fig.10 , Fig.10 The schematic diagram of the structure of the battery 100 provided in some embodiments of the present application includes a plurality of battery cells 20 and a bus assembly 10 , wherein the bus assembly 10 electrically connects the plurality of battery cells 20 .

[0161] As an example, Fig.10 As shown, 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 busbar assembly 10 to increase the voltage and capacity of the battery 100 .

[0162] 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%.

[0163] As an example, an endothermic phase change material made of ternary carbonate with lithium carbonate, sodium carbonate and potassium carbonate as main components can be used as the heat absorbing part 21, or an endothermic phase change material made of lithium carbonate as main component can be used as the heat absorbing part 21, and two battery cells 20 are connected through a busbar assembly 10 containing the above two heat absorbing parts 21. A plurality of B / A ratio samples are set, and when one of the two battery cells 20 is in thermal runaway, the influence of the heat transferred by the different B / A ratio samples on the adjacent battery cells is studied, and the data shown in Table 1 are obtained:

[0164] Table 1

[0165]

[0166] An endothermic decomposition material made of zinc carbonate as the main component can be used as the heat absorbing part 21, and two battery cells 20 are connected through the busbar assembly 10 containing the heat absorbing part 21. A plurality of B / A ratio samples are set, and when one of the two battery cells 20 is in thermal runaway, the influence of the heat transferred by the different B / A ratio samples on the adjacent battery cells is studied, and the data shown in Table 2 are obtained:

[0167] Table 2

[0168]

[0169]

[0170] Referring to Table 1, comparing Examples 1-5 and Comparative Examples 6-10 respectively, it can be found that in the busbar assembly 10 whose 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 greater than or equal to 1%, thermal runaway is not likely to occur in adjacent battery cells.

[0171] Referring to Table 2, by comparing Examples 11-15 and Comparative Examples 16-20 respectively, 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 in adjacent battery cells, and when B / A is ≥ 1%, thermal runaway is not likely to occur in adjacent battery cells.

[0172] 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 the heat of the busbar component 10.

[0173] An embodiment of the present application provides an electrical device, the electrical device comprising a battery provided by any one of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0174] Please refer to Figure 7The embodiment of the present application also provides a confluence assembly 10, which includes a confluence component 1 and a heat absorbing component 2, and the confluence component 1 and the heat absorbing component 2 are arranged along the first direction X. The heat absorbing component 2 includes a heat absorbing part 21 and a heat conducting part 22, and the heat conducting part 22 is provided with a receiving cavity 221, and the heat absorbing part 21 is arranged in the receiving cavity 221. Along the first direction X, the top of the heat conducting part 22 is provided with a through hole 222 connected to the receiving cavity 221. Among them, the heat absorbing part 21 can adopt an endothermic phase change material or an endothermic decomposition material, and the endothermic phase change material can be a ternary carbonate made of lithium carbonate, sodium carbonate, and potassium carbonate as the main components; the main component of the endothermic decomposition material can be zinc carbonate. The first direction X can be the direction of gravity.

[0175] By arranging the heat conducting part 22 on the top of the converging part 1 and arranging the heat absorbing part 21 in the heat conducting part 22, the heat absorbing part 21 can absorb the heat of the converging part 1 through the heat conducting part 22. The heat absorbing part 21 is accommodated in the accommodating cavity 221, reducing the risk of the heat absorbing part 21 contacting the converging part 1 or the battery cell 20. The through hole 222 is arranged at the top of the heat conducting part 22 and is connected to the accommodating cavity 221. When the heat absorbing part 21 changes, the accommodating cavity 221 can balance the pressure with the outside of the heat conducting part 22 through the through hole 222, reducing the risk of the heat conducting part 22 being damaged by the heat absorbing part 21 in the accommodating cavity 221 due to heat absorption expansion; the through hole 222 is arranged at the top of the heat conducting part 22, reducing the risk of the heat absorbing part 21 contacting the converging part 1 or the battery cell 20.

[0176] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0177] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A busbar assembly, characterized in that: include: A busbar component for electrically connecting a plurality of battery cells; a heat absorbing component connected to the flow collecting component, wherein the heat absorbing component is configured to absorb heat from the flow collecting component; The heat absorbing component comprises a heat absorbing portion, and the material of the heat absorbing portion is a heat absorbing phase change material or a heat absorbing decomposition material.

2. The busbar assembly according to claim 1, characterized in that: The endothermic phase change material includes ternary carbonate, nitrate, fluoride salt or hydrochloride.

3. The busbar assembly according to claim 1, characterized in that: The endothermic decomposition material includes magnesium carbonate, zinc carbonate, copper carbonate, calcium carbonate, nickel carbonate or lead carbonate.

4. The busbar assembly according to any one of claims 1 to 3, characterized in that: The heat absorbing member further includes a heat conducting portion, at least a portion of which is located between the heat absorbing member and the flow collecting member to separate the heat absorbing member and the flow collecting member.

5. The busbar assembly according to claim 4, characterized in that: The current collecting component has a first surface away from the battery cell along a first direction, the heat conducting portion is in contact with the first surface, and at least a portion of the heat conducting portion is located between the heat absorbing portion and the current collecting component along the first direction.

6. The busbar assembly according to claim 4, characterized in that: An accommodating cavity is formed inside the heat conducting part, and the heat absorbing part is accommodated in the accommodating cavity.

7. The busbar assembly according to claim 6, characterized in that: The volume of the heat absorbing part is V1, and the volume of the heat conducting part is V2, satisfying V1 / V2≥1.

8. The busbar assembly according to claim 6, characterized in that: The heat conducting part is provided with a through hole, and the through hole is communicated with the accommodating cavity.

9. The busbar assembly according to claim 8, characterized in that: The current collecting component has a first surface away from the battery cell along a first direction, the heat conducting portion is in contact with the first surface, and along the first direction, the heat conducting portion has a second surface away from the first surface, and the through hole is disposed on the second surface.

10. The busbar assembly according to claim 9, characterized in that: Along the first direction, the sum of the projected areas of the through holes arranged on the second surface is S1, and the projected area of ​​the second surface is S2, satisfying 10%≤S1 / S2≤80%.

11. The busbar assembly according to claim 9, characterized in that: The heat conducting part further has a third surface and a fourth surface. Along the first direction, the third surface is arranged opposite to the second surface, the third surface is in contact with the first surface, the fourth surface connects the second surface and the third surface, and the through hole is arranged on the fourth surface.

12. The busbar assembly according to claim 4, characterized in that: The heat conducting part is made of metal material or ceramic material.

13. A battery, characterized in that: The invention comprises a plurality of battery cells and a busbar assembly according to any one of claims 1 to 12, wherein the busbar assembly electrically connects the plurality of battery cells.

14. The battery according to claim 13, characterized in that The heat absorbing component includes a heat absorbing portion, the material of the heat absorbing portion is heat absorbing phase change material or heat absorbing decomposition material, the weight of the battery cell is A, the weight of the heat absorbing portion of the busbar assembly electrically connected to the battery cell is B, and B / A≥1%.

15. An electrical equipment, characterized in that: The electrical device comprises the battery as claimed in claim 13 or 14, and the battery is used to provide electrical energy to the electrical device.

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