Battery cell, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and an adapter, the electrode assembly and the adapter are accommodated in the shell, the electrode assembly comprises an electrode main body and a tab extending from the end part of the electrode main body, and the adapter electrically connects an electrode terminal on the shell with the tab. The adapter and the electrode main body are arranged along a first direction, and the electrode main body comprises a pole piece provided with a first structure layer. The heat conductivity coefficient of the first structural layer in the first direction is larger than that of the first structural layer in the second direction, so that heat on the adapter can be quickly diffused in the first direction through the first structural layer and is transmitted in the direction far away from the adapter; the heat of the adapter can be quickly transferred to other parts of the battery monomer, so that the heat in the battery monomer is not easy to concentrate, and the temperature uniformity of each part in the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] The battery device has the advantages of high specific energy and high power density, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] With the continuous expansion of the application range of the battery device, people's requirements for the performance of the battery device are also getting higher and higher, especially the temperature uniformity related to the fast charging ability is more and more concerned by people. How to reduce the heat concentration in the battery device and improve the temperature uniformity is more and more valued by the skilled in the art. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, the heat in the battery monomer is not easy to concentrate, which is conducive to improving the temperature uniformity.

[0005] In the first aspect, the present application provides a battery monomer, the battery monomer comprising a shell, an electrode assembly and an adapter, the shell being provided with an electrode terminal; the electrode assembly is contained in the shell, the electrode assembly comprising an electrode main body and a tab extending from an end of the electrode main body; the adapter is contained in the shell and electrically connects the electrode terminal and the tab, the adapter and the electrode main body are arranged along a first direction, the electrode main body comprises a tab sheet provided with a first structure layer, the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in a second direction, the second direction intersects the first direction.

[0006] In the above structure, since the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in the second direction, the heat on the adapter can be quickly diffused in the first direction through the first structure layer and transmitted in the direction away from the adapter, so that the heat of the adapter can be quickly transmitted to other components of the battery monomer, so that the heat in the battery monomer is not easy to concentrate, and the temperature uniformity of each part in the battery monomer is improved.

[0007] According to the battery cell provided by some embodiments of the present application, the first structure layer comprises a first part and a second part, the first part and the second part extend along a first direction, and the first part and the second part are arranged alternately along a second direction, and the thermal conductivity of the first part is greater than that of the second part. By arranging the first part and the second part alternately along the second direction and setting the thermal conductivity of the first part to be greater than that of the second part, the heat of the part of the battery body close to the adapter in the first direction can be more easily diffused in the direction away from the adapter along the first direction, and is not easily transmitted along the second direction or other directions.

[0008] According to the battery cell provided by some embodiments of the present application, the area density of the first part is greater than that of the second part. By setting the area density of the first part to be greater than that of the second part, the amount of the material capable of conducting heat arranged on the first part is greater than that on the second part, so that the thermal conductivity of the first part can be greater than that of the second part.

[0009] According to the battery cell provided by some embodiments of the present application, the first structure layer is provided with a protrusion protruding outward, and the protrusion is located on the first part, so that the amount of the material of the first part is greater than that of the second part, so that the thermal conductivity of the first part can be greater than that of the second part, and the heat can be better diffused along the extension direction of the first part.

[0010] According to the battery cell provided by some embodiments of the present application, the protrusion extends along the first direction, so that the protrusion can transmit the heat along the first direction, and the heat can be better transmitted along the first direction.

[0011] According to the battery cell provided by some embodiments of the present application, the first structure layer is provided with a protrusion protruding outward, the number of the protrusions located on the first part is greater than that of the protrusions located on the second part, and the protrusions are arranged along the first direction, so that the amount of the material of the first part is greater than that of the second part, so that the thermal conductivity of the first part can be greater than that of the second part, and the heat can be better diffused along the extension direction of the first part.

[0012] According to the battery cell provided by some embodiments of the present application, along the thickness direction of the pole piece, the thickness of the first part is equal to that of the second part, and the density of the first part is greater than that of the second part, so that the amount of the material capable of conducting heat arranged on the first part is greater than that on the second part under the condition that the thicknesses of the first part and the second part are equal, so that the thermal conductivity of the first part can be greater than that of the second part.

[0013] According to the battery cell provided by some embodiments of the present application, the pole piece includes a current collector layer, a conductive layer and an active material layer, the current collector layer includes two first surfaces arranged opposite to each other along the thickness direction of the pole piece, the conductive layer is arranged on at least one first surface, the active material layer is arranged on the surface of the conductive layer away from the current collector layer, and the conductive layer is configured as a first structure layer, so that an additional layer structure with heat conduction capacity does not need to be arranged on the pole piece for heat conduction.

[0014] According to the battery cell provided by some embodiments of the present application, the first surface includes a coated area and a blank area connected to each other, the conductive layer is arranged on the coated area, the blank area is not provided with the conductive layer, and the tab is connected to the blank area and extends from the blank area along the first direction.

[0015] According to the battery cell provided by some embodiments of the present application, the pole piece includes two second surfaces arranged opposite to each other along the thickness direction of the pole piece, and the first structure layer is arranged on the second surface, which is beneficial to reduce the change of the internal structure of the pole piece.

[0016] In a second aspect, the present application provides a battery device, which includes the battery cell provided by the above technical solution.

[0017] In a third aspect, the present application provides a power consumption device, which includes the battery device provided by the above technical solution, and the battery device is used for providing electric energy.

[0018] The technical solution provided by the embodiments of the present application at least brings the following beneficial effects:

[0019] The present application provides a battery cell, which includes a shell, an electrode assembly and an adapter, the electrode assembly and the adapter are accommodated in the shell, the electrode assembly includes an electrode main body and a tab extending from the end of the electrode main body, the adapter electrically connects the electrode terminal on the shell and the tab, the adapter and the electrode main body are arranged along a first direction, the electrode main body includes a pole piece provided with a first structure layer, the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in a second direction, and the second direction intersects the first direction. In the above structure, since the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in the second direction, the heat on the adapter can be quickly spread in the first direction through the first structure layer and transferred in the direction away from the adapter, so that the heat of the adapter can be quickly transferred to other components of the battery cell, so that the heat in the battery cell is not easy to concentrate, and the temperature uniformity of each part of the battery cell is improved.

[0020] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals refer to similar components throughout the several views.

[0022] Figure 1 Structure schematic diagram of a vehicle provided by some embodiments of the present application;

[0023] Figure 2 Split structure schematic diagram of a battery device provided by some embodiments of the present application;

[0024] Figure 3 Split diagram of a battery cell provided by some embodiments of the present application;

[0025] Figure 4 Partial cross-sectional structure schematic diagram of a pole piece in a battery cell provided by some embodiments of the present application;

[0026] Figure 5 Partial cross-sectional structure schematic diagram of a pole piece in a battery cell provided by some other embodiments of the present application;

[0027] Figure 6 Structure schematic diagram of a first structure layer in a pole piece of a battery cell provided by some embodiments of the present application;

[0028] Figure 7 Structure schematic diagram of a first structure layer in a pole piece of a battery cell provided by some other embodiments of the present application;

[0029] Figure 8 Structure schematic diagram of a first structure layer in a pole piece of a battery cell provided by some other embodiments of the present application;

[0030] Figure 9 Structure schematic diagram of a first structure layer in a pole piece of a battery cell provided by some other embodiments of the present application;

[0031] Figure 10 Local schematic diagram of a pole piece of a battery cell provided by some embodiments of the present application.

[0032] In the drawings:

[0033] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 7, battery cell;

[0034] 71, housing; 72, electrode assembly; 721, tab; 7210, first structure layer; 72101, first portion; 72102, second portion; 72103, protrusion;

[0035] 7211, current collector layer; 7212, active material layer; 7214, conductive layer;

[0036] 722, tab; 723, electrode main body; 73, adapter;

[0037] 10, first surface; 101, coating area; 102, blank area; 20, second surface; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0038] The embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0040] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0041] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), unless otherwise explicitly specified.

[0042] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0045] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0046] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0047] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the active material for continued use.

[0048] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc.

[0049] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0050] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector layer and a positive electrode active material disposed on at least one surface of the positive electrode current collector layer.

[0051] As an example, the positive electrode current collector layer has two surfaces opposite each other in its own thickness direction, and the positive electrode active material is disposed on either or both of the two opposite surfaces of the positive electrode current collector layer.

[0052] As an example, the positive electrode current collector layer can be made of metal foil, conductive polymer material, carbon material, or composite current collector layer. For example, as a metal foil, pure metal, alloy, or surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector layer may include a polymer material base layer and a metal layer. The composite current collector layer can 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.).

[0053] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM)523 LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 LiNi 0.8 Co 0.15 Al 0.05 O2) and modified compounds thereof. The modified compounds refer to the substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

[0054] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector layer.

[0055] As an example, the negative electrode current collector layer can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector layer. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be adopted. The composite current collector layer can include a polymer material base layer and a metal layer. The composite current collector layer can 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 base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the negative electrode sheet can include a negative electrode current collector layer and a negative electrode active material disposed on at least one surface of the negative electrode current collector layer.

[0057] As an example, the negative electrode current collector layer has two opposite surfaces in the thickness direction of itself, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector layer.

[0058] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0059] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the foamed metal surface can not be provided with a negative active material, or can be provided with a negative active material.

[0060] As an example, the negative active material can be filled or / and deposited in the negative current collector layer.

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

[0062] The separator is disposed between the positive electrode and the negative electrode.

[0063] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0064] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0065] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0066] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The present application does not have a particular limitation on the type of the electrolyte, and the electrolyte can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0067] wherein the liquid electrolyte includes an electrolyte salt and a solvent.

[0068] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalato borate, lithium bis-oxalato borate, lithium difluoro bis-oxalato phosphate, and lithium tetrafluoro oxalato phosphate.

[0069] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, 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, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0070] In some embodiments, the electrolyte solution can also optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, an additive capable of improving certain properties of the battery cell, such as an additive capable of improving overcharge / fast charge properties of the battery cell, an additive capable of improving high-temperature properties of the battery cell, an additive capable of improving low-temperature properties of the battery cell, and the like.

[0071] wherein the gel-state electrolyte includes a polymer as a backbone network and can be used in combination with an ionic liquid-lithium salt.

[0072] wherein the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0073] As an example, the polymer of the polymer solid-state electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0074] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfur, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0075] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler in a polymer solid-state electrolyte.

[0076] The electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0077] In some embodiments, the electrode assembly is in a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0078] In some embodiments, the electrode assembly is in a stacked structure.

[0079] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided alternately.

[0080] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments stacked alternately, with one positive electrode sheet clamped between adjacent folded segments.

[0081] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments stacked alternately.

[0082] As an example, a plurality of isolation pieces can be provided, each between any adjacent positive electrode sheet or negative electrode sheet.

[0083] As an example, the isolation pieces can be provided continuously and arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0084] In some embodiments, the electrode assembly can be in a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0085] In some embodiments, the electrode assembly is provided with a tab, which can guide the current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0086] With the development of the new energy industry, the demand for fast charging and energy of power batteries is increasing, and the current carried by the switching piece and other conductive structural parts in the battery cell is also increasing, which makes the heat generated on the switching piece and other conductive structural parts more and more, and the temperature is also higher and higher. Under the action of the switching piece and other conductive structural parts, the temperature of the area close to the switching piece and other conductive structural parts of the electrode assembly is significantly higher than that of the area far away from the switching piece and other conductive structural parts, which makes the heat in the battery cell more concentrated, and the temperature difference larger, so that the charging window of the area with lower temperature is smaller, which limits the improvement of the fast charging capacity of the battery cell.

[0087] In order to reduce the concentration of heat in the battery monomer and improve the uniformity of the battery monomer temperature, the application provides a battery monomer, which comprises a shell, an electrode assembly and an adapter, the electrode assembly and the adapter are contained in the shell, the electrode assembly comprises an electrode body and a tab extending from an end of the electrode body, the adapter electrically connects the electrode terminal on the shell and the tab, the adapter and the electrode body are arranged along a first direction, the electrode body comprises a tab sheet provided with a first structure layer, the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in a second direction, and the second direction intersects the first direction. In the above structure, since the thermal conductivity of the first structure layer in the first direction is greater than the thermal conductivity of the first structure layer in the second direction, the heat on the adapter can quickly spread in the first direction through the first structure layer and be transmitted in the direction away from the adapter, so that the heat of the adapter can be quickly transmitted to other components of the battery monomer, so that the heat in the battery monomer is not easy to concentrate, and the temperature uniformity of each part in the battery monomer is improved.

[0088] The battery monomer described in the embodiments of the application is suitable for a battery device and a power consumption device using the battery device. The battery device disclosed in the embodiments of the application can be used in a power consumption device using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element.

[0089] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0090] The following embodiments take a vehicle as an example for convenient description.

[0091] Figure 1 The vehicle structure schematic diagram provided in some embodiments of the application.

[0092] As shown in Figure 1 The vehicle 1 is internally provided with a battery device 2, and the battery device 2 can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power supply of the vehicle 1.

[0093] The vehicle 1 can also include a controller 3 and a motor 4, the controller 3 being configured to control the battery device 2 to supply power to the motor 4, for example, for the power requirements of the vehicle 1 during start-up, navigation and travel.

[0094] In some embodiments of the present application, the battery device 2 can not only serve as a power source for the operation of the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0095] Figure 2 A split structure diagram of the battery device is provided for some embodiments of the present application. As shown in the figure, the battery device 2 includes a box body 5 and a battery cell 7, and the battery cell 7 is contained in the box body 5. The battery cell 7 can be the smallest unit constituting a battery. Figure 2

[0096] The box body 5 is used to contain the battery cell 7, and the box body 5 can have various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b are mutually covered, and the first box body part 5a and the second box body part 5b jointly define a containing space 5c for containing the battery cell 7. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a is a plate-like structure, which is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be a hollow structure with one side open, and the open side of the first box body part 5a is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can have various shapes, such as a cylinder, a cuboid, etc.

[0097] To improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box body part 5a and the second box body part 5b.

[0098] Suppose the first box body part 5a is covered on the top of the second box body part 5b, the first box body part 5a can also be called an upper box cover, and the second box body part 5b can also be called a lower box body.

[0099] In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells 7 are connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 7 is contained in the box body 5; of course, the multiple battery cells 7 can first be connected in series, in parallel or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is contained in the box body 5. ​

[0100] The battery cell 7 can be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0101] Some embodiments of the present application provide a battery cell 7, referring to Figure 3 , the battery cell 7 includes a shell 71, an electrode assembly 72, and an adapter 73, the shell 71 is provided with an electrode terminal; the electrode assembly 72 is accommodated in the shell 71, the electrode assembly 72 includes an electrode body 723 and a tab 722 extending from an end of the electrode body 723; the adapter 73 is accommodated in the shell 71 and electrically connects the electrode terminal and the tab 722, the adapter 73 and the electrode body 723 are arranged along a first direction X, referring to Figures 4-6 , the electrode body 723 includes a tab 721 provided with a first structural layer 7210, the thermal conductivity of the first structural layer 7210 in the first direction X is greater than the thermal conductivity of the first structural layer 7210 in a second direction Y, the second direction Y intersects the first direction X.

[0102] The shell 71 can be a component in the battery cell 7 for forming a cavity for accommodating components such as the electrode assembly 72, the adapter 73, etc. The shell 71 can be of various shapes and sizes, such as a cuboid, a hexagonal prism, etc. Specifically, the shape of the shell 71 can be determined according to the specific shape and size of the electrode assembly 72. The material of the shell 71 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. One or more electrode assemblies 72 can be contained in the shell 71.

[0103] The electrode terminal, as a device provided on the shell 71, part of its structure extends into the shell 71 to electrically connect with the electrode assembly 72, and part of its structure extends to the outside of the battery cell 7, which can be used to electrically connect with the power consumption device or charging device outside the battery cell 7, so that the battery cell 7 can be charged and discharged. The electrode terminal can include but is not limited to a cylindrical structure, an elliptical cylindrical structure, etc., which can be set by those skilled in the art according to the actual situation.

[0104] The electrode assembly 72 is a component in the battery cell 7 where electrochemical reactions occur. The electrode body 723 can be the main structure in the electrode assembly 72, which can include a positive electrode tab and a negative electrode tab arranged in layers. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) can be embedded and extracted between the positive electrode tab and the negative electrode tab. The tab 722 can be a structure in the electrode assembly 72 for electrical connection with external components, which can lead current out of or into the electrode body 723.

[0105] The adapter 73 can be a component for electrically connecting the tab 722 with the electrode terminal, which can enable stable transmission of current between the electrode terminal and the electrode assembly 72.

[0106] The adapter 73 and the electrode body 723 are arranged along the first direction X. The adapter 73 may be disposed on one side of the electrode body 723 in the first direction X, so that the adapter 73 can be disposed between the electrode terminal and the electrode assembly 72 located on the housing 71, so that the adapter 73 can connect the electrode assembly 72 and the electrode terminal.

[0107] The first structural layer 7210 can be a layered structure in the electrode 721, made of a thermally conductive material, used to diffuse heat in the electrode body 723 to reduce heat concentration in the electrode body 723 and improve the temperature uniformity in the battery cell 7. For example, the first structural layer 7210 can be a layered structure such as the original current collector layer 7211, conductive layer 7214, and active material layer 7212 in the electrode 721. The first structural layer 7210 utilizes the original thermal conductivity of these layered structures to diffuse heat in the electrode body 723, reducing heat concentration in the electrode body 723. Alternatively, the first structural layer 7210 can be an additional thermally conductive layered structure provided on the electrode 721, which can diffuse heat from the electrode body 723 to reduce heat concentration in the electrode body 723.

[0108] The thermal conductivity of the first structural layer 7210 in the first direction X is greater than that in the second direction Y. This can mean that the thermal conductivity of the first structural layer 7210 in the first direction X is greater than that in the second direction Y. For example, a structure with a higher thermal conductivity extending along the first direction X can be provided on the first structural layer 7210 to improve its thermal conductivity in the first direction X. By making the thermal conductivity of the first structural layer 7210 in the first direction X greater than that in the second direction Y, the thermal conductivity of the first structural layer 7210 in the first direction X is stronger than that in the second direction Y, thereby enabling the first structural layer 7210 to better diffuse heat along the first direction X.

[0109] The first direction X can refer to the arrangement direction of the adapter 73 and the electrode body 723. Since the adapter 73 can generate a large amount of heat when current passes through it, the thermal conductivity of the first structural layer 7210 in the electrode sheet 721 of the electrode body 723 in the first direction X is set to be greater than that in the second direction Y. This allows the heat from the adapter 73 to be transferred to the electrode body 723, and the heat on the electrode body 723 near the adapter 73 can be quickly diffused through the first structural layer 7210 in the first direction X, making it less likely for heat to concentrate in the battery cell 7.

[0110] The second direction Y can be a direction in the first structural layer 7210 intersecting the first direction X. By making the thermal conductivity of the first structural layer 7210 in the first direction X greater than that in the direction intersecting the first direction X, heat can be better diffused in the first direction X than in other directions, which helps to accelerate the speed of heat diffusion away from the adapter 73. Exemplarily, the second direction Y is perpendicular to the first direction X.

[0111] Exemplarily, the thermal conductivity of the first structural layer 7210 is greater than that of other structures in the pole piece 721, so that the heat of the electrode body 723 can be preferentially diffused through the first structural layer 7210, facilitating the design of the heat transfer direction by designing the structure of the first structural layer 7210.

[0112] Exemplarily, the thermal conductivity of the first structural layer 7210 can be determined according to the national standard GB / T 10294-2008, and the specific determination method can refer to the national standard GB / T 10294-2008, which will not be repeated here.

[0113] In the above structure, since the thermal conductivity of the first structural layer 7210 in the first direction X is greater than that in the second direction Y, the heat on the adapter 73 can be quickly diffused in the first direction X through the first structural layer 7210 and transferred away from the adapter 73, so that the heat of the adapter 73 can be quickly transferred to other components of the battery monomer 7, so that the heat in the battery monomer 7 is not easily concentrated, and the temperature uniformity of each part of the battery monomer 7 is improved.

[0114] In some embodiments, the first structural layer 7210 includes a first part 72101 and a second part 72102, the first part 72101 and the second part 72102 both extend along the first direction X, and the first part 72101 and the second part 72102 are alternately arranged along the second direction Y, and the thermal conductivity of the first part 72101 is greater than that of the second part 72102.

[0115] The first part 72101 and the second part 72102 are two different parts of the first structural layer 7210. The first part 72101 and the second part 72102 both extend along the first direction X, which means that the first part 72101 is arranged to extend along the first direction X, and the second part 72102 is arranged to extend along the first direction X, so that the first part 72101 continuously extends in the first direction X while the second part 72102 also continuously extends in the first direction X, so that heat can be transferred in the electrode body 723 along the extension direction (the first direction X) of the first part 72101 and the second part 72102.

[0116] By alternately arranging the first portions 72101 and the second portions 72102 along the second direction Y, and by making the thermal conductivity of the first portions 72101 greater than the thermal conductivity of the second portions 72102, heat of the part of the battery body close to the adapter 73 along the first direction X can be more easily diffused along the first direction X away from the adapter 73 through the first portions 72101 and the second portions 72102, and is less likely to be transmitted along the second direction Y or other directions.

[0117] Exemplarily, the thermal conductivity of the first portions 72101 can be made greater than the thermal conductivity of the second portions 72102 by selecting the thermal conductivity of the material of the first portions 72101 to be greater than the thermal conductivity of the material of the second portions 72102, so that the first portions 72101 have stronger heat conduction capacity; the thermal conductivity of the first portions 72101 can also be made greater than the thermal conductivity of the second portions 72102 by providing more heat-conducting material on the first portions 72101 than on the second portions 72102, so that the first portions 72101 have stronger heat conduction capacity.

[0118] In some embodiments, the first portions 72101 have a greater areal density than the second portions 72102.

[0119] Areal density can refer to mass per unit area. By setting the areal density of the first portions 72101 to be greater than the areal density of the second portions 72102, more heat-conducting material is provided on the first portions 72101 than on the second portions 72102, so that the thermal conductivity of the first portions 72101 can be greater than the thermal conductivity of the second portions 72102.

[0120] In some embodiments, with reference to Figure 6 The first structure layer 7210 is provided with a protrusion 72103 protruding outward, and the protrusion 72103 is located on the first portions 72101.

[0121] The protrusion 72103 can be a structure protruding outward on the first structure layer 7210, and the amount of material used at the part of the first structure layer 7210 provided with the protrusion 72103 is greater than the amount of material used at the part of the first structure layer 7210 not provided with the protrusion 72103. The protrusion 72103 is located on the first portions 72101, which can mean that the protrusion 72103 is provided on the first portions 72101, and the second portions 72102 are not provided with the protrusion 72103. By providing the protrusion 72103 on the first portions 72101, the amount of material used on the first portions 72101 is greater than the amount of material used on the second portions 72102, so that the thermal conductivity of the first portions 72101 can be greater than the thermal conductivity of the second portions 72102, and heat can be better diffused along the extension direction of the first portions 72101.

[0122] Exemplarily, the first part 72101 can be provided with a plurality of protrusions 72103 arranged at intervals along the first direction X; or the first part 72101 can be provided with a plurality of protrusions 72103 arranged along the first direction X, and the protrusions 72103 are in contact with each other. Compared with the protrusions 72103 arranged at intervals, the plurality of protrusions 72103 in contact with each other can better improve the heat transfer capacity of the first part 72101 in the first direction X.

[0123] In some embodiments, with reference to Figure 7 , the protrusions 72103 extend along the first direction X.

[0124] The protrusions 72103 extending along the first direction X can mean that the protrusions 72103 are arranged continuously along the first direction X, so that the protrusions 72103 can transfer heat along the first direction X, so that heat can be better transferred along the first direction X.

[0125] In some embodiments, with reference to Figure 8 , the first structure layer 7210 is provided with protrusions 72103 protruding outward, the number of protrusions 72103 on the first part 72101 is greater than the number of protrusions 72103 on the second part 72102, and the protrusions 72103 are arranged along the first direction X.

[0126] As described above, the protrusions 72103 can be structures protruding outward on the first structure layer 7210, and the amount of material of the part of the first structure layer 7210 provided with the protrusions 72103 is greater than the amount of material of the part of the first structure layer 7210 not provided with the protrusions 72103.

[0127] The number of protrusions 72103 on the first part 72101 is greater than the number of protrusions 72103 on the second part 72102 can mean that the first part 72101 and the second part 72102 are each provided with a plurality of protrusions 72103, and the number of protrusions 72103 provided on the first part 72101 is greater than the number of protrusions 72103 provided on the second part 72102, so that the amount of material of the first part 72101 is greater than the amount of material of the second part 72102, so that the thermal conductivity of the first part 72101 can be greater than the thermal conductivity of the second part 72102, so that heat can be better diffused along the extension direction of the first part 72101.

[0128] The protrusions 72103 are arranged along the first direction X can mean that a plurality of protrusions 72103 on the first part 72101 are arranged in sequence along the first direction X, and a plurality of protrusions 72103 on the second part 72102 are arranged in sequence along the first direction X.

[0129] The outward protruding protrusions 72103 arranged on the first structural layer 7210 can increase the surface area of the first structural layer 7210, and be conducive to improving the contact area of the first structural layer 7210 with other components or substances. If the first structural layer 7210 is a layer structure of the original current collector layer 7211, the conductive layer 7214, or the like, which is located inside the pole piece 721, the first structural layer 7210 can increase the connecting force with the adjacent layer structure through the protrusions 72103, and improve the connecting strength between the structural layers of the pole piece 721, which is conducive to reducing the possibility of mutual peeling of the structural layers. If the first structural layer 7210 is a layer structure located on the surface of the pole piece 721, the first structural layer 7210 can increase the contact area with substances such as electrolyte through the protrusions 72103, which is conducive to improving the performance of the pole piece 721.

[0130] In some embodiments, with reference to Figure 9 , along the thickness direction of the pole piece 721, the thickness of the first part 72101 is equal to the thickness of the second part 72102, and the density of the first part 72101 is greater than the density of the second part 72102.

[0131] By setting the thickness of the first part 72101 in the thickness direction of the pole piece 721 to be equal to the thickness of the second part 72102 in the thickness direction of the pole piece 721, the possibility of thickness difference between the first part 72101 and the second part 72102 is reduced, and the possibility of step between the first part 72101 and the second part 72102 is reduced, which is conducive to improving the surface flatness of the first structural layer 7210.

[0132] By setting the density of the first part 72101 to be greater than the density of the second part 72102, the areal density of the first part 72101 can be greater than the areal density of the second part 72102 under the condition that the thickness of the first part 72101 is equal to the thickness of the second part 72102, so that the amount of heat-conducting material arranged on the first part 72101 is greater than the amount of heat-conducting material arranged on the second part 72102, and the thermal conductivity coefficient of the first part 72101 can be greater than the thermal conductivity coefficient of the second part 72102.

[0133] In some embodiments, with reference to Figure 4 , the pole piece 721 includes a current collector layer 7211, a conductive layer 7214, and an active material layer 7212, the current collector layer 7211 includes two first surfaces 10 oppositely arranged along the thickness direction of the pole piece 721, at least one first surface 10 is provided with the conductive layer 7214, the active material layer 7212 is arranged on the surface of the conductive layer 7214 away from the current collector layer 7211, and the conductive layer 7214 is configured as the first structural layer 7210.

[0134] The current collector layer 7211 can be a base structure in the tab 721, which serves as a carrier for disposing active materials. The first surface 10 is an end surface of the current collector layer 7211 in the thickness direction, and the two first surfaces 10 opposite to each other in the thickness direction of the current collector body are two first surfaces 10, and the material forming the current collector layer 7211 is located between the two first surfaces 10.

[0135] The conductive layer 7214 can be a structural layer for improving the electrical conductivity between the current collector layer 7211 and the active material layer 7212, which is disposed between the current collector layer 7211 and the active material layer 7212. The conductive layer 7214 can be disposed on at least one first surface 10, and the active material layer 7212 can be disposed on both first surfaces 10, or the active material layer 7212 can be disposed on one of the two first surfaces 10.

[0136] The active material layer 7212 is a structural layer including a polar active material, which can be formed on the surface of the conductive layer 7214 away from the current collector layer 7211 by a coating process.

[0137] By configuring the conductive layer 7214 as the first structural layer 7210, the conductive layer 7214 can not only improve the electrical conductivity between the current collector layer 7211 and the active material layer 7212, but also diffuse the heat of the electrode assembly 72, so that it is not necessary to additionally dispose a layer structure having a heat conduction capability on the tab 721 for heat conduction.

[0138] The tab 721 here can be a positive electrode tab or a negative electrode tab. Exemplarily, when the tab 721 is a positive electrode tab, the material of the current collector layer 7211 is aluminum. The conductive layer 7214 can be printed on the surface of the current collector layer 7211 by using a gravure printing device, and the recesses in the gravure printing device can form the protrusions in the first structural layer 7210. The conductive paste is prepared from a conductive agent, a binder and a solvent, the conductive agent includes carbon black, carbon nanotubes, carbon fibers, hollow carbon spheres, graphene and a mixture of the above materials, the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone. The conductive layer 7214 can also be printed on the surface of the current collector layer 7211 by gap printing to form the first part 72101 and the second part 72102 with different densities by alternately printing the conductive paste forming the first part 72101 and the conductive paste forming the second part 72102.

[0139] Exemplarily, when the pole piece 721 is a negative pole piece, the material of the current collector layer 7211 is copper. The conductive layer 7214 can be printed on the surface of the current collector layer 7211 by using a gravure printing device, in which the recesses can form the protrusions in the first structure layer 7210. The conductive layer 7214 can be prepared by using a conductive agent, a binder and a solvent. The conductive agent includes carbon black, carbon nanotubes, carbon fibers, hollow carbon spheres, graphene and a mixture thereof. The binder is a butadiene-styrene rubber. The solvent is water. The conductive layer 7214 can also be printed on the surface of the current collector layer 7211 by using a gap printing method to form the first part 72101 and the second part 72102 with different densities.

[0140] In some embodiments, the first surface 10 includes a coated area 101 and a blank area 102 connected to each other. The conductive layer 7214 is arranged on the coated area 101. The blank area 102 is not provided with the conductive layer 7214. The tab 722 is connected to the blank area 102. The tab 722 extends from the blank area 102 along the first direction X.

[0141] The coated area 101 can be an area on the first surface 10 provided with the conductive layer 7214. The blank area 102 can be an area on the first surface 10 not provided with the conductive layer 7214.

[0142] The tab 722 connected to the blank area 102 can be that the tab 722 extends outwardly from the blank area 102 of the current collector layer 7211, so that the tab 722 can smoothly lead the current of the current collector layer 7211 out or smoothly input the current to the current collector layer 7211. Exemplarily, the tab 722 can be formed by cutting the blank area 102 of the current collector layer 7211.

[0143] In some embodiments, with reference to Figure 10 , along the thickness direction of the pole piece 721, the projection area of the conductive layer 7214 is greater than the projection area of the active material layer 7212, so that the conductive layer 7214 can better improve the conductive capacity between the current collector layer 7211 and the active material layer 7212.

[0144] In some embodiments, with reference to Figure 5 , the pole piece 721 includes two second surfaces 20 oppositely arranged along the thickness direction of the pole piece 721. The first structure layer 7210 is arranged on the second surface 20.

[0145] The second surface 20 can be two sides of the pole piece 721 oppositely arranged in the thickness direction, and the material of the pole piece 721 is located between the two second surfaces 20. The first structural layer 7210 is arranged on the second surface 20, which can mean that the first structural layer 7210 is an additional layered structure with heat conduction ability arranged on the second surface 20, which is beneficial to reduce the change of the internal structure of the pole piece 721. Exemplarily, the second surface 20 can be an outer surface of the active material layer 7212.

[0146] Some embodiments of the present application also provide a battery device 2 comprising the battery cell 7 provided by the above technical solutions.

[0147] Some embodiments of the present application also provide a power utilization device comprising the battery device 2 provided by the above technical solutions, and the battery device 2 is used to provide electric energy.

[0148] Some embodiments of the present application provide a battery cell 7 comprising a housing 71, an electrode assembly 72 and an adapter 73, the electrode assembly 72 and the adapter 73 are contained in the housing 71, the electrode assembly 72 comprises an electrode body 723 and a tab 722 extending from an end of the electrode body 723, and the adapter 73 electrically connects the electrode terminal on the housing 71 and the tab 722, the adapter 73 and the electrode body 723 are arranged along a first direction X, the electrode body 723 comprises a pole piece 721, the pole piece 721 comprises a current collector layer 7211, a conductive layer 7214 and an active material layer 7212, the conductive layer 7214 is arranged on at least one first surface 10 of the current collector layer 7211, the active material layer 7212 is arranged on the surface of the conductive layer 7214 away from the current collector layer 7211, and the conductive layer 7214 is configured as a first structural layer 7210, the thermal conductivity of the first structural layer 7210 in the first direction X is greater than the thermal conductivity of the first structural layer 7210 in a second direction Y, and the second direction Y intersects the first direction X. In the above structure, since the thermal conductivity of the first structural layer 7210 in the first direction X is greater than the thermal conductivity of the first structural layer 7210 in the second direction Y, the heat on the adapter 73 can be quickly spread in the first direction X through the first structural layer 7210 and transmitted in the direction away from the adapter 73, so that the heat of the adapter 73 can be quickly transmitted to other components of the battery cell 7, so that the heat in the battery cell 7 is not easy to concentrate, and the temperature uniformity of each part of the battery cell 7 is improved.

[0149] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing is equipped with electrode terminals; An electrode assembly, housed within the housing, the electrode assembly comprising an electrode body and tabs extending from an end of the electrode body; An adapter is housed in the housing and electrically connects the electrode terminals and the tabs. The adapter and the electrode body are arranged along a first direction. The electrode body includes an electrode sheet with a first structural layer. The thermal conductivity of the first structural layer in the first direction is greater than the thermal conductivity of the first structural layer in a second direction. The second direction intersects the first direction.

2. The battery cell according to claim 1, characterized in that, The first structural layer includes a first part and a second part, both of which extend along the first direction and are arranged alternately along the second direction. The thermal conductivity of the first part is greater than that of the second part.

3. The battery cell according to claim 2, characterized in that, The surface density of the first part is greater than that of the second part.

4. The battery cell according to claim 3, characterized in that, The first structural layer has outwardly protruding protrusions, which are located in the first part.

5. The battery cell according to claim 4, characterized in that, The protrusion extends along the first direction.

6. The battery cell according to claim 3, characterized in that, The first structural layer has outwardly protruding protrusions, and the number of protrusions on the first part is greater than the number of protrusions on the second part. The protrusions are arranged along the first direction.

7. The battery cell according to claim 3, characterized in that, Along the thickness direction of the electrode sheet, the thickness of the first part is equal to the thickness of the second part, and the density of the first part is greater than the density of the second part.

8. The battery cell according to any one of claims 1-7, characterized in that, The electrode includes a current collector layer, a conductive layer, and an active material layer. The current collector layer includes two first surfaces disposed opposite each other along the thickness direction of the electrode. The conductive layer is disposed on at least one of the first surfaces. The active material layer is disposed on the surface of the conductive layer away from the current collector layer. The conductive layer is configured as the first structural layer.

9. The battery cell according to claim 8, characterized in that, The first surface includes a coated area and a blank area that are connected to each other. The conductive layer is disposed in the coated area, and the blank area is not disposed of the conductive layer. The tab is connected to the blank area and extends from the blank area along the first direction.

10. The battery cell according to any one of claims 1-7, characterized in that, The electrode includes two second surfaces disposed opposite each other along the thickness direction of the electrode, and the first structural layer is disposed on the second surface.

11. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11, the battery device being used to provide electrical energy.

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