Battery, electrical apparatus, energy storage apparatus, and manufacturing method for battery

Abstract

A battery (1), an electrical apparatus, an energy storage apparatus, and a manufacturing method for a battery (1). The battery (1) comprises: an electrode assembly (10); a casing (20), comprising a housing (21) and a housing cover (22), the housing cover (22) and the housing (21) being welded to form an accommodating space (20a) for accommodating the electrode assembly (10); and an attachment layer (30), at least provided in the housing (21) adjacent to a welding position (20b) between the housing cover (22) and the housing (21), the attachment layer (30) comprising a thermally conductive layer, and the thermal conductivity of the thermally conductive layer being higher than the thermal conductivity of the housing (21). The thermally conductive layer can quickly dissipate the majority of the heat generated during the welding process between the housing (21) and the housing cover (22), reducing a rise in temperature at the welding position (20b) of the housing (21), thereby reducing the risk of deformation and cracking at the welding position (20b) of the housing (21), and improving the reliability of the battery (1).

Description

Battery, power consuming device, energy storage device and battery manufacturing method

[0001] Cross Reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410866973.7, filed on June 28, 2024, entitled “Battery, power consuming device, energy storage device and battery manufacturing method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery, a power consuming device, an energy storage device and a battery manufacturing method. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side. With the continuous expansion of the application field of power batteries, not only higher requirements are put forward for the volumetric energy density of the batteries, but also higher requirements are put forward for the reliability of the batteries.

[0006] SUMMARY

[0007] To solve the above technical problems, the present disclosure provides a battery, a power consuming device, an energy storage device and a battery manufacturing method with high reliability.

[0008] The present disclosure is implemented by the following technical solutions.

[0009] A first aspect of the present disclosure provides a battery, comprising: an electrode assembly; a shell and a shell cover, the shell cover being welded with the shell to form a containing space for accommodating the electrode assembly; an attachment layer provided at least in the shell adjacent to a welding position between the shell cover and the shell, the attachment layer comprising a thermally conductive layer, the thermal conductivity of the thermally conductive layer being higher than the thermal conductivity of the shell.

[0010] By providing an attachment layer adjacent to the welding position in the shell, the attachment layer comprises a thermally conductive layer with a higher thermal conductivity than the shell, and the thermally conductive layer can quickly dissipate most of the heat generated during the welding of the shell and the shell cover, thereby reducing the temperature rise of the welding position of the shell (welding heat affected zone), and reducing the risk of deformation and cracking of the welding position of the shell, and improving the reliability of the battery.

[0011] In some embodiments, the thermally conductive layer comprises a graphene metal layer.

[0012] The attachment layer adjacent to the welding position of the shell comprises a graphene metal layer, which has heat dissipation performance and strength much higher than ordinary shells (such as aluminum), so that the heat of the welding heat-affected zone can be quickly dissipated during the welding process, and the strength of the shell can be also strengthened, thereby reducing the risk of deformation and cracking of the shell near the welding position and improving the reliability of the battery.

[0013] In some embodiments, the graphene metal layer comprises nickel graphene or nickel alloy graphene.

[0014] The nickel-containing graphene metal layer has good strength and toughness, and is more resistant to deformation than ordinary shells (such as aluminum), further reducing the risk of deformation and cracking of the shell.

[0015] In some embodiments, the graphene metal layer comprises the nickel alloy graphene, and the nickel alloy graphene comprises nickel-cobalt-phosphorus alloy graphene or nickel-cobalt alloy graphene.

[0016] The nickel-cobalt-phosphorus alloy graphene or the nickel-cobalt alloy graphene not only has good strength and toughness, but also has strong high-temperature resistance.

[0017] In some embodiments, the graphene metal layer is formed on the outer surface of the shell.

[0018] Since the graphene metal layer has high strength and heat dissipation performance, it can slow down the attenuation rate of the strength of the attachment layer during the welding process, thereby further reducing the risk of deformation and cracking of the attachment layer, and also facilitating welding and electroplating.

[0019] In some embodiments, the shell has an opening, the shell cover closes the opening, and the graphene metal layer is arranged on the outer surface of the shell along the entire circumference of the opening edge of the shell.

[0020] The graphene metal layer is formed on the outer surface of all the shell walls, so that the graphene metal layer is strengthened around the entire circumference of the shell adjacent to the opening edge, further reducing the risk of deformation and cracking of the attachment layer.

[0021] In some embodiments, in a direction perpendicular to the shell cover, the graphene metal layer comprises a boundary portion away from the opening edge of the shell, and the spacing between the boundary portion and the opening edge is in the range of 1 mm to 2 mm.

[0022] The size of the graphene metal layer away from the opening edge is in a suitable range, which not only improves the strength of the attachment layer, but also inhibits the increase of cost.

[0023] In some embodiments, the thickness of the graphene metal layer is in a range of 0.2 μm to 20 μm along a wall thickness direction of the shell.

[0024] The thickness of the graphene metal layer is suitable, which not only has good strength and heat conduction performance, but also improves the strength of the attachment layer and inhibits the increase of cost.

[0025] In some embodiments, the graphene metal layer is formed by electroplating.

[0026] The graphene metal layer formed by electroplating has stronger adhesion and higher surface uniformity, which improves the attachment reliability.

[0027] In some embodiments, the attachment layer further comprises a light-absorbing layer attached to the graphene metal layer and at least partially covering the graphene metal layer, and the graphene metal layer is located between the light-absorbing layer and the shell along a thickness direction of the graphene metal layer.

[0028] The light-absorbing layer can better absorb light (such as laser) in the welding process, reduce heat loss in the welding process, and improve the welding quality.

[0029] In some embodiments, the light-absorbing layer covers the entire graphene metal layer.

[0030] In this way, as much light as possible can be absorbed in the welding process, heat loss in the welding process can be reduced, and the welding quality can be further improved.

[0031] In some embodiments, the thickness of the light-absorbing layer is in a range of 0.1 μm to 10 μm along a wall thickness direction of the shell.

[0032] The thickness of the light-absorbing layer is suitable, which not only has good light-absorbing performance, but also improves the welding reliability and inhibits the increase of cost.

[0033] In some embodiments, the surface roughness of the light-absorbing layer is greater than the surface roughness of the shell; and / or, the color of the light-absorbing layer comprises black.

[0034] The surface roughness of the light-absorbing layer is greater than the surface roughness of the shell, which not only absorbs light, but also reduces the reflection effect, further improving the welding reliability. The black light-absorbing layer further improves the light-absorbing effect.

[0035] In some embodiments, the light-absorbing layer comprises ink.

[0036] The ink has a darker material than the graphene metal, which not only improves the light-absorbing effect, but also reduces the reflection.

[0037] In some embodiments, the light-absorbing layer is attached to the graphene metal layer by coating.

[0038] The coating method is simple, efficient, and easy to control the thickness of the light-absorbing layer.

[0039] A second aspect of the present disclosure provides a power-using device comprising the battery of the first aspect, which can provide power for the power-using device.

[0040] A third aspect of the present disclosure provides an energy storage device comprising the battery of the first aspect, which can store and provide power.

[0041] A fourth aspect of the present disclosure provides a battery manufacturing method, the battery comprising a shell and a shell cover, the shell having an opening, the shell cover closing the opening to form a containing space in the shell for accommodating an electrode assembly, the method comprising: a first attachment step of attaching a thermally conductive layer at least at a position adjacent to the edge of the opening of the shell, the thermally conductive layer having a thermal conductivity higher than that of the shell; and a welding step of welding the shell cover to the shell with the thermally conductive layer attached.

[0042] By arranging the thermally conductive layer having a thermal conductivity higher than that of the shell at a position adjacent to the welding position of the shell, the thermally conductive layer can quickly dissipate most of the heat generated during the welding of the shell and the shell cover, thereby reducing the temperature rise at the welding position of the shell (welding heat-affected zone), and reducing the risk of deformation and cracking at the welding position of the shell, and improving the reliability of the battery.

[0043] In some embodiments, the thermally conductive layer comprises a graphene metal layer, and in the first attachment step, the graphene metal layer is attached to the shell by electroplating.

[0044] The thermally conductive layer comprises a graphene metal layer, which has much higher heat dissipation performance and strength than ordinary shells (such as aluminum), so that during welding, the heat of the welding heat-affected zone can be quickly dissipated, and the strength of the shell can be strengthened, thereby reducing the risk of deformation and cracking near the welding position of the shell, and improving the reliability of the battery. The graphene metal layer is more firmly attached to the surface of the shell by electroplating, and the graphene metal layer on the surface of the shell has higher surface uniformity, improving the attachment reliability.

[0045] In some embodiments, after the first attachment step and before the welding step, the method further comprises a second attachment step of attaching a light-absorbing layer to the graphene metal layer, the light-absorbing layer at least partially covering the graphene metal layer.

[0046] The light-absorbing layer can better absorb light (e.g., laser) during welding, reduce heat loss during welding, and improve welding quality.

[0047] In some embodiments, in the second attaching step, the light-absorbing layer is attached to the graphene metal layer by coating.

[0048] The coating method is simple, efficient, and easy to control the thickness of the light-absorbing layer.

[0049] Inventive Effects:

[0050] The reliability of the battery can be improved through the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0051] 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 description of preferred embodiments, and are not meant to limit the present disclosure. Moreover, the same reference numerals in all accompanying drawings represent the same elements. In the drawings:

[0052] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present disclosure;

[0053] FIG. 2 is a perspective exploded schematic diagram of a battery pack according to some embodiments of the present disclosure;

[0054] FIG. 3 is a perspective exploded schematic diagram of a battery according to some embodiments of the present disclosure;

[0055] FIG. 4 is a perspective view of a battery according to some embodiments of the present disclosure;

[0056] FIG. 5 is a cross-sectional view of a shell according to some embodiments of the present disclosure;

[0057] FIG. 6 is a temperature change curve diagram of a shell plated with different graphene metal layers and a common pure aluminum shell within a predetermined time according to some embodiments of the present disclosure;

[0058] FIG. 7 is a flowchart of a manufacturing method of a battery according to some embodiments of the present disclosure;

[0059] FIG. 8 is a flowchart of a manufacturing method of a battery according to some other embodiments of the present disclosure.

[0060] Reference numerals 1000 - vehicle; 100 - battery pack; 200 - controller; 300 - motor; 1 - battery; 10 - electrode assembly; 20 - case; 20a - accommodation space; 20b - welding position; 21 - housing; 211 - first housing wall; 21a - opening; 22 - case cover; 23 - electrode terminal; 24 - pressure relief mechanism; 30 - attachment layer; 31 - graphene metal layer; 31a - first edge; 31b - second edge; 32 - light absorption layer; 2 - box; 3 - lower box; 4 - upper box. DETAILED DESCRIPTION

[0061] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms "include" and "have" and any variations thereof used in the specification and the above drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0064] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0066] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the embodiments of the present disclosure and simplify the description, and thus cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and thus cannot be understood as a limitation on the embodiments of the present disclosure.

[0067] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and the like should be understood 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 directly connected, can also be indirectly connected through an intermediate medium, can be 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 disclosure can be understood according to the specific circumstances.

[0068] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical term "contact" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0069] In the embodiments of the present disclosure, the battery can be a secondary battery, which refers to a battery that can continue to be used by activating the active material through charging after the battery is discharged.

[0070] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present disclosure are not limited thereto.

[0071] The battery generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0072] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0073] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0074] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0075] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone only one or in combination of two or more. Among them, examples of the lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be 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 manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0076] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with the positive electrode active material, or of course, can be provided with the positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0078] As an example, the negative current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. The composite current collector 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.). In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0079] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0080] In some embodiments, the separator is a separator film. The present disclosure does not have a particular limitation on the type of the separator film, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be selected.

[0081] 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.

[0082] 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 simultaneously functions to transport ions and to separate the positive electrode and the negative electrode.

[0083] In some embodiments, the battery further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The present disclosure 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.

[0084] 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.

[0085] In some embodiments, the electrode assembly is in a stacked structure.

[0086] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately and stacked.

[0087] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of stacked folding sections, and one positive electrode sheet can be interposed between adjacent folding sections.

[0088] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of stacked folding sections.

[0089] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0090] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0091] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0092] In some embodiments, the electrode assembly can be provided with tabs, which can lead current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0093] In some embodiments, the battery can include a case. The case can be used to enclose the electrode assembly, the electrolyte, and other components. The case can be a steel case, an aluminum case, a plastic case (e.g., a polypropylene case), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, among others.

[0094] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or another shape of battery. The prismatic battery can include a square battery, a blade battery, a polygonal battery (e.g., a hexagonal battery), among others, without particular limitation.

[0095] In some embodiments, the case can include a case cover and a case body. The case body can be provided with an opening, and the case cover can close the opening to form a sealed space for accommodating the electrode assembly, the electrolyte, and other substances. The case body can be provided with one or more openings. The case cover can also be provided with one or more openings.

[0096] In some embodiments, the case can be provided with at least one electrode terminal electrically connected to the tabs. The electrode terminal can be directly connected to the tabs or indirectly connected to the tabs through an adapter component. The electrode terminal can be provided on the case cover or on the case body.

[0097] In some embodiments, the case can be provided with a pressure relief mechanism. The pressure relief mechanism can be used to release the internal pressure of the battery.

[0098] The battery mentioned in the embodiments of the present disclosure can include a battery module or a battery pack.

[0099] In some embodiments, the battery module can include one or more batteries to provide a single physical module with higher voltage and capacity. When there are multiple batteries, the multiple batteries can be connected in series, in parallel, or in a mixed connection through a busbar component. The multiple batteries can be arranged and fixed to form a battery module.

[0100] In some embodiments, the battery pack can include a box and a battery or a battery module accommodated in the box.

[0101] In some embodiments, the case can be part of a chassis structure of the vehicle. For example, portions of the case can be part of a floor of the vehicle, or portions of the case can be part of cross members and longitudinal members of the vehicle.

[0102] Hereinafter, the present disclosure will be described in detail.

[0103] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, not only higher requirements are put forward for the volume energy density of the battery, but also higher requirements are put forward for the reliability of the battery.

[0104] In order to improve the volume energy density of the battery, it is expected that the wall thickness of the shell will be thinner to improve the volume utilization rate of the battery. However, the thinning of the wall thickness of the shell makes the risk of cracking of the wall of the shell higher. For example, in the process of welding the shell and the shell cover, a large amount of heat is accumulated around the welding position (also known as the welding heat affected zone), and there is a risk of causing changes in the microstructure and performance of the metal (such as aluminum) to cause poor strength around the welding position due to the input of high heat during the welding process. Therefore, rapidly removing the heat generated by welding from the heat affected zone helps to reduce the risk of cracking in this area.

[0105] Through further research, by forming a heat conduction layer with a higher heat conductivity than the shell around the welding position of the shell, the heat conduction performance can be improved, the heat of the welding heat affected zone can be quickly dissipated, and the risk of deformation and cracking around the welding position of the shell can be reduced.

[0106] Based on such a design concept, the present disclosure provides a battery, an electrode assembly; a shell including a shell body and a shell cover, the shell cover being welded with the shell body to form a containing space for accommodating the electrode assembly; an attachment layer provided at least in the shell body adjacent to the welding position between the shell cover and the shell body, the attachment layer including a heat conduction layer with a higher heat conductivity than the shell.

[0107] By providing an attachment layer adjacent to the welding position in the shell body, the attachment layer includes a heat conduction layer with a higher heat conductivity than the shell, and the heat conduction layer can quickly dissipate most of the heat generated during the welding of the shell and the shell cover, reduce the temperature rise of the welding position of the shell (welding heat affected zone), and reduce the risk of deformation and cracking of the welding position of the shell, thereby improving the reliability of the battery.

[0108] The battery provided by the embodiments of the present disclosure can be used in, but is not limited to, an electric device such as an energy storage power system, a vehicle, a ship or an aircraft. Since the battery provided by the embodiments of the present disclosure reduces the risk of deformation and cracking near the welding position of the shell, the reliability of the battery is improved, and thus the reliability of the electric device is also improved.

[0109] The battery provided by the embodiments of the present disclosure can also be used as a battery pack in multiple groups. The battery pack can also be used in, but is not limited to, an electric device such as an energy storage power system, a vehicle, a ship or an aircraft.

[0110] The embodiments of the present disclosure provide an electric device comprising the above-mentioned battery or battery pack for providing electric energy. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0111] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following will be described with reference to the accompanying drawings.

[0112] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present disclosure. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range-extended car, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery pack 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery pack 100 can be used for power supply of the vehicle 1000, for example, the battery pack 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0113] In some embodiments of the present disclosure, the battery pack 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0114] FIG. 2 is a perspective exploded view of the battery pack 100 according to an embodiment of the present disclosure. The battery pack 100 includes a box 2, which includes a lower box 3 and an upper box 4. The upper box 4 is arranged on the lower box 3 to form a receiving space for accommodating the battery 1. In the battery pack 100, the battery 1 can be multiple, and the multiple batteries 1 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple batteries 1 are connected in series and in parallel. The multiple batteries 1 can be directly connected in series, in parallel, or in a mixed manner, and then the multiple batteries 1 are placed in the receiving space formed by the upper box 4 and the lower box 3. The battery pack 100 can further include other structures. For example, the battery pack 100 can further include a busbar component for realizing electrical connection between the multiple batteries 1.

[0115] Some embodiments of the present disclosure will be described in detail below with reference to FIGS. 3-5.

[0116] The battery 1 according to an embodiment of the present disclosure includes an electrode assembly 10, an outer case 20, and an attachment layer 30. The outer case 20 includes a case body 21 and a case cover 22. The case cover 22 is welded to the case body 21 to form a receiving space 20a for accommodating the electrode assembly 10. The attachment layer 30 is arranged at least at a welding position 20b between the case cover 22 and the case body 21. The attachment layer 30 includes a heat-conducting layer.

[0117] The electrode assembly 10 can include a positive electrode plate, a negative electrode plate, and a separator. During charging and discharging of the battery, active ions (e.g., lithium ions) are inserted into and extracted from the positive electrode plate and the negative electrode plate. The separator is arranged between the positive electrode plate and the negative electrode plate, and can prevent short circuit between the positive electrode plate and the negative electrode plate while allowing the active ions to pass through. The positive electrode plate, the negative electrode plate, and the separator can be wound to form a wound structure, or can be stacked to form a stacked structure.

[0118] The outer case 20 includes the case body 21 and the case cover 22. The case cover 22 is welded to the case body 21 to form the receiving space 20a for accommodating the electrode assembly 10. In addition, the receiving space 20a can also accommodate electrolyte and the like. The outer case 20 can be a steel case, an aluminum case, a composite metal case (e.g., a copper-aluminum composite case), or the like. The outer case 20 can be cylindrical, prismatic, or other shapes. The prismatic shape includes square, blade, multi-prismatic, and the like. The multi-prismatic shape can be hexagonal, and the present disclosure is not particularly limited.

[0119] The welding position 20b between the case cover 22 and the case body 21 can be a welding seam formed by melting and connecting welding materials to the case cover 22 and the case body 21 using a high temperature of a welding heat source. For example, as shown in FIG. 3, the case body 21 is provided with an opening 21a, and the case cover 22 closes the opening 21a. The welding position 20b is formed at an edge of the opening 21a of the case body 21.

[0120] During the welding of the case 21 and the case cover 22, a large amount of heat is gathered around the welding position 20b (also referred to as a welding heat affected zone), and there is a risk of causing changes in the microstructure and properties of the metal (e.g., aluminum) around the welding position 20b due to the input of high heat during the welding process, which leads to deterioration in strength.

[0121] The thermal conductivity of the thermal conductive layer is higher than the thermal conductivity of the case 21. The thermal conductivities of the thermal conductive layer and the case 21 can be measured by a steady-state method, or the thermal conductivities of the thermal conductive layer and the case 21 can be determined by a comparison method. The attachment layer 30 includes the thermal conductive layer, and the attachment layer 30 can be attached to the welding heat affected zone of the case 21 adjacent to the welding position 20b and can also be simultaneously attached to the welding heat affected zone of the case cover 22 adjacent to the welding position 20b, thereby improving the thermal conductivity and strength of the welding heat affected zones of the case 21 and the case cover 22.

[0122] By including the thermal conductive layer having a higher thermal conductivity than the case 21 in the attachment layer 30, the thermal conductive layer can quickly dissipate most of the heat generated during the welding of the case 21 and the case cover 22, thereby reducing the temperature rise of the welding position (welding heat affected zone) of the case 21 and reducing the risk of deformation and cracking of the welding position of the case 21, thereby improving the reliability of the battery 1.

[0123] In some embodiments, the thermal conductive layer includes a graphene metal layer 31.

[0124] The graphene metal layer 31 is a combination of graphene and metal particles, i.e., a composite material formed by combining graphene and metal particles. This composite material not only has the characteristics of high thermal conductivity and thermal stability of graphene, but also further enhances the strength of the composite material by adding metal materials, so that the attachment layer 30 has much higher heat dissipation performance and strength than the ordinary case 21 (e.g., an aluminum case). It should be noted that the graphene metal layer herein mainly includes a graphene metal layer having a higher thermal conductivity than the case, and the graphene metal layer can be appropriately selected according to the material of the case. The graphene metal layer can be commercially available or self-made, and the present disclosure does not have a particular limitation thereon.

[0125] The present disclosure does not have a particular limitation on the formation method of the graphene metal layer as long as the graphene metal layer can be formed on the surface of the case.

[0126] For example, the graphene metal composite material can be attached to the surface of the case 21 by electroplating to form the graphene metal layer 31. In addition, the graphene metal layer 31 can be formed on the inner surface and / or the outer surface of the welding heat affected zone of the case 21. The electroplated graphene metal layer can use known electroplating equipment and processes.

[0127] Since the graphene metal layer 31 has a thermal conductivity significantly higher than that of the ordinary metal shell 21 (e.g., aluminum), the heat of the welding heat-affected zone can be quickly dissipated during the welding process, and the strength of the shell 21 can be enhanced, thereby reducing the risk of deformation and cracking of the shell 21 near the welding position and improving the reliability of the battery.

[0128] In some embodiments, the graphene metal layer 31 includes nickel graphene or nickel alloy graphene.

[0129] The nickel graphene is a composite material formed by combining nickel particles with graphene. The nickel alloy graphene is a composite material formed by combining nickel alloy particles with graphene. The composite material not only has the characteristics of high thermal conductivity and thermal stability of the graphene at the welding position of the shell 21, but also further enhances the strength and toughness of the welding position of the shell 21 by adding nickel or nickel alloy.

[0130] For example, when the shell 21 is an aluminum shell and the graphene metal layer 31 is nickel graphene, a nickel graphene electrolyte with a pH value ranging from 1.5 to 4.0 is configured, the temperature is controlled to be between 35 and 45°C, and the current density ranges from 0.5 to 1.2 A / dm2. The electroplating process is carried out under the condition that the current passes through the nickel graphene electrolyte, and the nickel graphene is deposited on the surface of the aluminum shell to form a nickel graphene plating layer. It should be noted that the electroplating conditions described herein are exemplary, and those skilled in the related art can adjust the electroplating conditions according to actual conditions.

[0131] Therefore, the graphene metal layer 31 containing nickel (nickel or nickel alloy) not only has good thermal conductivity, but also has good strength and toughness, and has stronger resistance to deformation compared to the ordinary shell 20 (e.g., aluminum), further reducing the risk of deformation and cracking of the shell 20.

[0132] For example, the nickel alloy graphene includes nickel-cobalt-phosphorus alloy graphene or nickel-cobalt alloy graphene. The nickel-cobalt-phosphorus alloy graphene is a composite material formed by combining nickel-cobalt-phosphorus alloy with graphene. The nickel-cobalt alloy graphene is a composite material formed by combining nickel-cobalt alloy with graphene.

[0133] FIG. 6 shows a comparison of temperature variation curves of the nickel-cobalt alloy graphene coated shell 20, the nickel alloy graphene coated shell 20 and the ordinary metal aluminum shell 20 under room temperature conditions during a period of 0 to 120s of natural cooling. As can be seen from FIG. 6, the temperature of the nickel graphene coated shell 20 at 120s of natural cooling at room temperature is lower than that of the nickel-cobalt alloy graphene coated shell 20 and the ordinary aluminum shell at 120s, thus it can be judged that the thermal conductivity of the nickel graphene coated shell 20 is higher than that of the ordinary aluminum shell and the heat dissipation performance is better. Although the temperature of the nickel-cobalt alloy graphene coated shell 20 at 120s is basically the same as that of the ordinary aluminum shell at 120s, the strength and high temperature resistance of the nickel-cobalt alloy graphene coated shell 20 are much higher than those of the ordinary aluminum shell 20, that is, the nickel-cobalt alloy graphene coated shell 20 improves the strength and high temperature resistance of the shell 20 without affecting the heat dissipation performance.

[0134] In some embodiments, the graphene metal layer 31 is formed on the outer surface of the shell 21.

[0135] The outer surface of the shell 21 is the surface away from the electrode assembly 10, that is, the surface opposite to the inner surface of the shell 21 which contacts the electrolyte in the accommodation space 20a along the thickness direction of the shell 21. The graphene metal layer 31 can be formed on the outer surface of the shell 21 by electroplating process.

[0136] During the welding process of the shell 21 and the shell cover 22, the outer surface of the shell 21 is usually subjected to welding operation for the convenience of welding. For example, the graphene metal layer 31 can be formed on the outer surface of the shell 21 first, and then the welding operation is performed on the abutting seam position between the shell 21 and the shell cover 22 in the outer surface of the shell 20. Since the graphene metal layer 31 has high thermal conductivity and strength, the heat of the welding heat affected zone can be quickly dissipated, thereby further reducing the risk of deformation and cracking of the attachment layer 30, and the welding and electroplating processes are also facilitated.

[0137] In some embodiments, the graphene metal layer 31 can also be formed on the inner surface of the shell 21 adjacent to the electrode assembly 10 when the welding conditions permit, further improving the strength of the attachment layer 30.

[0138] In some embodiments, the shell 21 has an opening 21a, the shell cover 22 closes the opening 21a, and the graphene metal layer 31 is arranged on the outer surface of the shell 21 along the entire circumference of the opening edge of the shell 21.

[0139] For example, the shell 20 can be a square shell, the shell body 21 includes first shell walls 211 located on opposite sides of the electrode assembly 10 along the thickness direction of the electrode assembly 10, and two second shell walls 212 adjacent to the first shell walls 211 respectively, and the graphene metal layer 31 is formed at the positions of the two first shell walls 211 and the two second shell walls 212 adjacent to the edge of the opening 21a.

[0140] The graphene metal layer 31 is formed on the outer surfaces of all the shell walls in the plurality of shell walls, so that the graphene metal layer 31 is reinforced around the entire circumference of the shell body 21 adjacent to the edge of the opening 21a, further reducing the risk of deformation and cracking of the attachment layer 30.

[0141] In some embodiments, referring to FIG. 4, along the direction Z perpendicular to the shell cover 22, the graphene metal layer 31 includes a boundary portion 31b away from the opening edge of the shell body 21, and the spacing between the boundary portion 31b and the opening edge is in the range of 1 mm to 2 mm.

[0142] The boundary portion 31b can be parallel or not parallel to the opening edge, when the boundary portion 31b is parallel to the opening edge, the spacing L between the opening edge and the boundary portion 31b can be in the range of 1 mm to 2 mm; when the boundary portion 31b is not parallel to the opening edge, the shortest spacing L between the opening edge and the boundary portion 31b can be 1 mm, and the longest spacing can be 2 mm. For example, the graphene metal layer 31 includes a first edge 31a flush with the opening edge and a second edge (boundary portion 31b) away from the opening edge, and the spacing L between the first edge 31a and the second edge is in the range of 1 mm to 2 mm. The spacing L between the first edge 31a and the second edge is the width of the graphene metal layer 31, wherein L can be 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0143] The size of the graphene metal layer 31 away from the welding position 20b is in a suitable range, which not only can improve the strength of the attachment layer 30, but also can inhibit the increase of cost.

[0144] In some embodiments, along the wall thickness direction X of the shell 20, the thickness D1 of the graphene metal layer 31 is in the range of 0.2 μm to 20 μm. For example, the thickness D1 of the graphene metal layer 31 can be 0.2 μm, 0.5 μm, 1 μm, 2 μm, 4 μm, 5 μm, 8 μm, 9 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm.

[0145] The thickness D1 of the graphene metal layer 31 is appropriate, which not only has good strength and heat conduction performance, but also improves the strength of the attachment layer 30 and inhibits the increase of cost.

[0146] In some embodiments, the attachment layer 30 further comprises a light absorption layer 32, the light absorption layer 32 is attached to the graphene metal layer 31 and covers at least part of the graphene metal layer 31, and the graphene metal layer 31 is located between the light absorption layer 32 and the shell 21 along the thickness direction of the graphene metal layer 31.

[0147] For example, the light absorption layer 32 can be formed on part or all of the surface of the graphene metal layer 31 by coating.

[0148] The light absorption layer 32 can better absorb light (such as laser) in the welding process, reduce heat loss in the welding process, and improve the welding quality.

[0149] In some embodiments, the light absorption layer 32 covers the entire graphene metal layer 31.

[0150] The width of the light absorption layer 32 can be the same as the width of the graphene metal layer 31, for example, in the range of 1mm to 2mm. It can also exceed the width range of the graphene metal layer 31.

[0151] The light absorption layer 32 covers the entire graphene metal layer 31, which can absorb as much light as possible in the welding process, reduce heat loss in the welding process, and further improve the welding quality.

[0152] In some embodiments, the thickness of the light absorption layer 32 is in the range of 0.1μm to 10μm.

[0153] For example, the thickness D2 of the light absorption layer 32 can be 0.1μm, 0.2μm, 0.5μm, 1μm, 2μm, 4μm, 5μm, 8μm, 9μm, or 10μm.

[0154] The thickness D1 of the graphene metal layer 31 is appropriate, which not only has good light absorption performance and improves the welding reliability, but also inhibits the increase of cost.

[0155] In some embodiments, the surface roughness Ra of the light absorption layer 32 is greater than the surface roughness Ra of the shell 21. The surface roughness Ra can be measured by a commonly used method in the industry.

[0156] The surface roughness Ra of the light absorption layer 32 is greater than the surface roughness Ra of the shell 21, which not only absorbs light, but also reduces the reflection effect, and further improves the welding reliability.

[0157] In some embodiments, the color of the light-absorbing layer 32 includes black. The light-absorbing layer 32 can select a material with a color darker than the color of the graphene metal layer 31. For example, black ink, black paint, or other light-absorbing materials with a color darker than the color of the graphene metal layer 31.

[0158] In some embodiments, the shell cover 22 is provided with an electrode terminal 23 connected with the tab of the electrode assembly 10.

[0159] For example, the thickness of the shell cover 22 is generally thicker than the thickness of the shell 21, and the shell cover 22 is located at the end side of the electrode assembly 10 along the width direction Z, which is less likely to be pressed by the expansion of the electrode assembly 10. Therefore, the provision of the electrode terminal 23 on the thicker shell cover 22 can improve the stability of the electrode terminal 23. In addition, the shell cover 22 can also be provided with a pressure relief mechanism 24, such as a pressure relief valve.

[0160] Next, one specific example of the present disclosure will be described with reference to FIGS. 3-5.

[0161] The battery 1 of the embodiment of the present disclosure includes an electrode assembly 10 and a shell 20. The shell 20 includes a shell 21 having an opening 21a and a shell cover 22 welded to the shell 21 and closing the opening 21a to form a containing space 20a for accommodating the electrode assembly 10. The shell 21 includes two first shell walls 211 opposite along the wall thickness direction X of the shell 21, two second shell walls 212 opposite along the length direction Y of the shell 21, and the first shell walls 211 and the second shell walls 212 are adjacent to each other and connected with the bottom wall to enclose the containing space with the opening 21a. The shell 21 is provided with an attachment layer 30 adjacent to the edge of the opening 21a (such as the welding position 20b). The attachment layer 30 includes a graphene metal layer 31 formed on the outer surface of the shell 21 and a light-absorbing layer 32 formed on the outer surface of the graphene metal layer 31, and the light-absorbing layer 32 covers the entire graphene metal layer 31. The graphene metal layer 31 has a first edge 31a and a second edge (boundary part 31b) along the width direction Z of the shell 21, the first edge 31a coincides with the edge of the opening 21a, and the distance L between the first edge 31a and the second edge is the width of the graphene metal layer 31, which can be in the range of 1-2 mm, which can be understood as the range of the welding heat affected zone. The thickness D1 of the graphene metal layer 31 can be in the range of 0.2-20 μm. The width of the light-absorbing layer 32 along the width direction Z of the shell 21 is in the range of 1-2 mm, and the thickness D2 of the light-absorbing layer 32 can be in the range of 0.1-10 μm. The surface roughness Ra of the light-absorbing layer 32 is greater than the surface roughness Ra of the shell 21, which not only can absorb more laser light, but also can reduce the reflection of laser light. The graphene metal layer 31 can include nickel graphene or nickel alloy graphene or nickel-cobalt alloy graphene or nickel-cobalt-phosphorus alloy graphene, etc. The light-absorbing layer 32 includes black ink or paint, etc.

[0162] The present disclosure also provides a power utilization device, which comprises the battery 1 for providing electric energy mentioned above.

[0163] The present disclosure also provides an energy storage device, which comprises the battery 1 for providing electric energy mentioned above, and the battery is capable of storing and providing electric energy.

[0164] The energy storage device can be an energy storage box or an energy storage cabinet. The energy storage cabinet comprises a plurality of battery compartments for accommodating the battery. In addition, the energy storage cabinet can also comprise a thermal management component, a power control component, etc.

[0165] Referring to FIGS. 7 and 8, the present disclosure also provides a manufacturing method of a battery 1, which comprises a shell 21 having an opening 21a and a shell cover 22 sealing the opening 21a to form an accommodation space 20a for accommodating an electrode assembly 10 in the shell 21, the method comprising:

[0166] S02, a first attaching step, attaching a thermally conductive layer at least at a position adjacent to the opening edge of the shell 21, the thermally conductive layer having a higher thermal conductivity than the shell 21;

[0167] S04, a welding step, welding the shell cover 22 to the shell 21 to which the thermally conductive layer is attached.

[0168] By arranging the thermally conductive layer having a higher thermal conductivity than the shell 21 at a position adjacent to the welding position 20b of the shell 21, the thermally conductive layer can quickly dissipate most of the heat generated during the welding of the shell cover 22 to the shell 21, thereby reducing the temperature rise of the welding position (welding heat affected zone) of the shell 20, and reducing the risk of deformation and cracking of the welding position of the shell 20, and improving the reliability of the battery.

[0169] In some embodiments, the thermally conductive layer comprises a graphene metal layer 31, which is attached to the shell 21 by electroplating in the first attaching step S02.

[0170] The graphene metal layer 31 has much higher heat dissipation performance and strength than ordinary shells 21 (such as aluminum), so that, during the welding process, the heat of the welding heat affected zone can be quickly dissipated, and the strength of the shell 20 can also be strengthened, thereby reducing the risk of deformation and cracking near the welding position of the shell 20, and improving the reliability of the battery. The graphene metal layer 31 is more firmly attached to the surface of the shell 21 by electroplating, and the graphene metal layer on the surface of the shell 21 has higher surface uniformity, thereby improving the attachment reliability.

[0171] In some embodiments, after the first attaching step S02 and before the welding step S04, the method further comprises a second attaching step S03 of attaching a light-absorbing layer 32 on the surface of the graphene metal layer 31, the light-absorbing layer 32 at least partially covering the graphene metal layer 31.

[0172] For example, the light-absorbing layer 32 can cover part or all of the surface of the graphene metal layer 31. The light-absorbing layer 32 can be made of a material with a color darker than that of the graphene metal layer 31, such as black ink, black paint, or other light-absorbing materials with a color darker than that of the graphene metal layer 31.

[0173] The light-absorbing layer 32 can better absorb light (e.g., laser) during the welding process, reduce heat loss during the welding process, and improve the welding quality.

[0174] In some embodiments, in the second attaching step S03, the light-absorbing layer 32 is attached to the graphene metal layer 31 by coating.

[0175] The coating method is simple, efficient, and easy to control the thickness of the light-absorbing layer 32.

[0176] The above embodiments are only used to illustrate the technical solutions of the present disclosure, and not to limit it; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be covered in the scope of the present disclosure. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the present disclosure.

Claims

1. A battery, comprising: Electrode assembly; A housing and a cover, wherein the cover is welded to the housing to form a receiving space for accommodating the electrode assembly; An attachment layer is provided at least in the housing near the welding position between the cover and the housing, the attachment layer including a thermally conductive layer, the thermal conductivity of the thermally conductive layer being higher than that of the housing.

2. The battery according to claim 1, wherein, The thermally conductive layer includes a graphene metal layer.

3. The battery according to claim 2, wherein, The graphene metal layer includes a nickel graphene layer or a nickel alloy graphene layer.

4. The battery according to claim 3, wherein, The graphene metal layer includes the nickel alloy graphene layer, which includes a nickel-cobalt-phosphorus alloy graphene layer or a nickel-cobalt alloy graphene layer.

5. The battery according to any one of claims 2 to 4, wherein, The graphene metal layer is disposed on the outer surface of the shell.

6. The battery according to any one of claims 2 to 5, wherein, The housing has an opening, and the housing cover closes the opening. The graphene metal layer is disposed on the outer surface of the housing along the entire circumference of the opening edge of the housing.

7. The battery according to any one of claims 2 to 6, wherein, Along a direction perpendicular to the shell cover, the graphene metal layer includes a boundary portion away from the opening edge of the shell, and the distance between the boundary portion and the opening edge is in the range of 1 mm to 2 mm.

8. The battery according to any one of claims 2 to 7, wherein, Along the wall thickness direction of the shell, the thickness of the graphene metal layer ranges from 0.2 μm to 20 μm.

9. The battery according to any one of claims 2 to 8, wherein, The attachment layer further includes a light-absorbing layer, which is attached to the graphene metal layer and at least partially covers the graphene metal layer. Along the thickness direction of the graphene metal layer, the graphene metal layer is located between the light-absorbing layer and the shell.

10. The battery according to claim 9, wherein, The light-absorbing layer covers the entire graphene metal layer.

11. The battery according to claim 9 or 10, wherein, Along the wall thickness direction of the housing, the thickness of the light-absorbing layer ranges from 0.1 μm to 10 μm.

12. The battery according to any one of claims 9 to 11, wherein, The surface roughness of the light-absorbing layer is greater than the surface roughness of the shell; and / or, The light-absorbing layer is black.

13. The battery according to any one of claims 9 to 12, wherein, The light-absorbing layer includes ink.

14. An electrical device comprising a battery according to any one of claims 1 to 13, the battery being capable of providing electrical energy to the electrical device.

15. An energy storage device comprising a battery according to any one of claims 1 to 13, the battery being capable of storing electrical energy and providing electrical energy.

16. A method of manufacturing a battery, the battery comprising a housing and a cover, the housing having an opening, the cover closing the opening to form a receiving space within the housing for receiving an electrode assembly, the method comprising: In the first attachment step, a thermally conductive layer is attached at least at a location adjacent to the opening edge of the housing, the thermal conductivity of the thermally conductive layer being higher than that of the housing. The welding step involves welding the shell cover to the housing to which the heat-conducting layer is attached.

17. The manufacturing method according to claim 16, wherein, The thermally conductive layer includes a graphene metal layer. In the first attachment step, the graphene metal layer is attached to the housing by electroplating.

18. The manufacturing method according to claim 17, wherein, After the first attachment step and before the welding step, the method further includes: The second attachment step involves attaching a light-absorbing layer to the graphene metal layer, wherein the light-absorbing layer at least partially covers the graphene metal layer.

19. The manufacturing method according to claim 18, wherein, In the second attachment step, the light-absorbing layer is attached to the graphene metal layer by coating.

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