Battery cell, battery device, and electric device

Abstract

The present application provides a battery cell, a battery device, and an electric device. The battery cell comprises: a casing comprising two packaging films, the two packaging films being connected to each other to form a chamber; an electrode assembly accommodated in the chamber; and an adsorption layer arranged on at least a portion of the surface of at least one packaging film facing the electrode assembly, the adsorption layer being used for adsorbing at least some of the gases inside the chamber.

Description

Battery cells, battery packs and electrical devices Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 2025100210243, filed on January 7, 2025, entitled “Battery cell, battery device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0003] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0004] Pouch batteries have attracted much attention due to their large capacity and high energy density, but their reliability still needs to be improved. Summary of the Invention

[0005] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0006] In a first aspect, this application provides a battery cell, comprising: a casing including two packaging films connected to each other to form a chamber; an electrode assembly housed within the chamber; and an adsorption layer disposed on at least a portion of the surface of at least one packaging film facing the electrode assembly, the adsorption layer being used to adsorb at least a portion of the gas within the chamber.

[0007] In the embodiments of this application, the battery cell includes a casing, an electrode assembly, and an adsorption layer. The casing includes two packaging films connected to each other to form a chamber. The electrode assembly is housed within the chamber for electrochemical reactions. The adsorption layer is disposed on at least a portion of the surface of at least one packaging film facing the electrode assembly to reduce the size between the adsorption layer and the chamber, thereby facilitating contact between the adsorption layer and the gas within the chamber. The adsorption layer can adsorb at least a portion of the gas within the chamber, reducing the risk of these gases escaping to the outside and causing adverse effects on the external environment, thus improving the reliability of the battery cell.

[0008] In some embodiments, the packaging film includes a main body and a sealing portion extending from the main body, the sealing portions of two packaging films are connected to each other so that the two main bodies form a chamber, an absorbent layer is disposed on at least a portion of the sealing portion, and / or an absorbent layer is disposed on at least a portion of the main body.

[0009] In the embodiments of this application, the packaging film includes a main body and a sealing edge extending from the main body. The sealing edges of the two packaging films are connected to each other so that the two main bodies form a chamber. The adsorption layer disposed on the main body can more easily adsorb the gas in the chamber to reduce the risk of the gas in the chamber escaping to the external environment, and / or the adsorption layer is disposed on the sealing edge to block at least part of the path of the gas escaping to the external environment through the sealing edge, so as to reduce the risk of the gas in the chamber causing adverse effects on the external environment and improve the reliability of the battery cell.

[0010] In some embodiments, the main body of both packaging films is provided with an adsorption layer.

[0011] In the embodiment of this application, an electrolyte is provided in the chamber, and an adsorption layer is provided in the main body of both packaging films, so that the gas generated by the electrolyte on both sides in the thickness direction can be adsorbed by the adsorption layer, thereby improving the reliability of the adsorption layer.

[0012] In some embodiments, the adsorption layer is disposed on the sealing portion and surrounds the main body portion.

[0013] In the embodiment of this application, the adsorption layer is disposed on the sealing portion and surrounds the main body portion to block the path of gas escaping to the external environment through the sealing portion, thereby reducing the risk of gas in the chamber causing adverse effects on the external environment and improving the reliability of the battery cell.

[0014] In some embodiments, the sealing portion includes a first region and a second region arranged along the width direction of the sealing portion, and an adsorption layer is disposed in the first region or the second region.

[0015] In the embodiment of this application, the sealing portion includes a first region and a second region arranged along the width direction of the sealing portion. An adsorption layer is provided on one of the first region and the second region to adsorb the gas in the chamber. On the other of the first region and the second region, the two packaging films are directly connected to each other to improve the connection reliability of the two sealing portions.

[0016] In some embodiments, the second region is disposed between the first region and the main body, and the adsorption layer is disposed in the second region.

[0017] In the embodiment of this application, the adsorption layer is disposed in the second region and close to the chamber. The two packaging films are directly connected in the first region to separate the adsorption layer from the external environment, thereby reducing the risk of the adsorption layer peeling off or breaking due to external force during the transportation or use of the battery cell and improving the reliability of the adsorption layer.

[0018] In some embodiments, the adsorption layer is disposed on at least a portion of the sealing portion, the width dimension L1 of the sealing portion and the dimension L2 of the adsorption layer in the width direction of the sealing portion satisfying 0.5*L1≤L2≤L1.

[0019] In the embodiments of this application, when the size of the adsorption layer in the width direction of the sealing portion meets the above conditions, the problem of insufficient adsorption capacity of the adsorption layer due to its small size is improved.

[0020] In some embodiments, the width dimension L1 of the sealing portion satisfies 0.3cm≤L1≤1cm, and the dimension L2 of the adsorption layer in the width direction of the sealing portion satisfies 0.15cm≤L2≤1cm.

[0021] In the embodiments of this application, when the size of the adsorption layer in the width direction of the sealing portion meets the above conditions, the problem of insufficient adsorption capacity of the adsorption layer due to its small size is improved.

[0022] In some embodiments, the thickness D1 of the packaging film and the thickness D2 of the adsorption layer satisfy 0.004*D1≤D2≤0.02*D1.

[0023] In the embodiments of this application, when the thickness of the adsorption layer meets the above conditions, it not only improves the problem of insufficient adsorption capacity due to the adsorption layer being too thin, but also improves the problem of excessively high cost of battery cells and excessively low energy density of battery cells due to the adsorption layer being too thick.

[0024] In some embodiments, the thickness D1 of the packaging film satisfies 0.3mm≤D1≤0.7mm, and the thickness D2 of the adsorption layer satisfies 1.2μm≤D2≤14μm.

[0025] In the embodiments of this application, when the thickness of the adsorption layer meets the above conditions, it not only improves the problem of insufficient adsorption capacity due to the adsorption layer being too thin, but also improves the problem of excessively high cost of battery cells and excessively low energy density of battery cells due to the adsorption layer being too thick.

[0026] In some embodiments, the adsorption layer comprises a metal-organic framework material, and the adsorption layer is used to adsorb hydrogen sulfide gas in the chamber.

[0027] In the embodiments of this application, hydrogen sulfide gas in the chamber is adsorbed by setting a metal-organic framework material in the packaging film, thereby reducing the risk of hydrogen sulfide gas escaping to the outside and causing adverse effects on the external environment, and improving the reliability of the battery cell.

[0028] Secondly, this application provides a battery device including the battery cell described in the first aspect embodiment above.

[0029] Thirdly, this application provides an electrical device including the battery device described in the second aspect embodiment above. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0032] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0033] Figure 3 is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0034] Figure 4 is an exploded view of a battery cell according to an embodiment of this application;

[0035] Figure 5 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0036] Figure 6 is a cross-sectional view of a battery cell according to an embodiment of this application at point AA in Figure 5.

[0037] Figure 7 is a front view of a battery cell provided in an embodiment of this application;

[0038] Figure 8 is a front view of a battery cell provided in another embodiment of this application;

[0039] Figure 9 is a cross-sectional view of a battery cell according to an embodiment of this application at point BB in Figure 7;

[0040] Figure 10 is a cross-sectional view of a battery cell according to another embodiment of this application at point BB in Figure 7;

[0041] Figure 11 is a partial structural schematic diagram of a battery cell according to another embodiment of this application;

[0042] Figure 12 is a cross-sectional view of a battery cell according to another embodiment of this application at point BB in Figure 7.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Vehicle; 101. Motor; 102. Controller;

[0045] 2. Battery assembly; 201. Battery module; 202. Housing; 2021. First housing; 2022. Second housing;

[0046] 3. Battery cells;

[0047] 4. Outer shell; 41. Packaging film; 42. Chamber; 431. Main body; 432. Sealing part; 441. First area; 442. Second area;

[0048] 5. Electrode assembly; 51. Electrode tab;

[0049] 6. Adsorption layer. Detailed Implementation

[0050] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0051] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0052] In the description of the embodiments of this application, 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", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0053] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0057] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0058] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0059] A single battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode, a negative electrode, and a separator.

[0060] During actual operation, pouch cells may generate some harmful substances, which may have an adverse impact on the external environment.

[0061] In related technologies, sulfide solid electrolytes are widely used in solid-state battery systems due to their high ionic conductivity, which is beneficial for lithium ion transport. However, sulfide solid electrolytes are unstable in air and easily decompose to generate hydrogen sulfide. This means that pouch cell batteries using sulfide solid electrolytes may release hydrogen sulfide gas into the environment during production, transportation, and operation, thus polluting the environment and causing adverse effects on users.

[0062] To address the aforementioned issues, this application provides a battery cell comprising a casing, an electrode assembly, and an adsorption layer. The casing includes two packaging films connected to each other to form a chamber. The electrode assembly is housed within the chamber for electrochemical reactions. The adsorption layer is disposed on at least a portion of the surface of at least one packaging film facing the electrode assembly, thereby reducing the size between the adsorption layer and the chamber. This facilitates contact between the adsorption layer and the gas within the chamber, and the adsorption layer can adsorb at least a portion of the gas within the chamber, reducing the risk of these gases escaping to the outside environment and causing adverse effects, thus improving the reliability of the battery cell.

[0063] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0064] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0065] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0066] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0067] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0068] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0069] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0070] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 shows a schematic diagram of the structure of a battery device according to an embodiment of this application.

[0072] The battery device 2 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 3, which are connected in series, parallel, or mixed connections via a busbar.

[0073] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 3.

[0074] As an example, the battery cell assembly can be a battery module 201, which is formed by arranging and fixing multiple battery cells 3 to form an independent module. As an example, the battery module 201 can be formed by binding multiple battery cells 3 together with cable ties.

[0075] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 202 and one or more battery cell assemblies, the battery cell assemblies being housed in the housing 202.

[0076] As an example, the battery cell assembly can be a battery module 201, which can be housed in the housing by fixing the battery module 201 in the housing.

[0077] As an example, the battery cell assembly can also be housed in the housing 202 by directly fixing multiple battery cells 3 to the housing 202.

[0078] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together, forming a closed space inside the housing 202 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 2021 may be a top cover or a bottom plate.

[0079] As an example, the housing 202 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 202 forms an enclosed space to accommodate the battery cell assembly.

[0080] In some embodiments, the housing 202 may be part of the vehicle's chassis structure. For example, a portion of the housing 202 may be at least a portion of the vehicle's floor, or a portion of the housing 202 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0081] Figure 3 shows a schematic diagram of the structure of a battery module according to an embodiment of this application.

[0082] In some embodiments, as shown in Figures 2 and 3, there are multiple battery cells 3, which are first connected in series, parallel, or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel, or mixed to form a whole and housed in a housing 202.

[0083] Multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 3 in the battery module 201.

[0084] Figure 4 is an exploded view of a battery cell provided in an embodiment of this application.

[0085] The battery cell 3 refers to the smallest unit that makes up the battery. As shown in Figure 4, the battery cell 3 includes a casing 4 and an electrode assembly 5. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator located between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0086] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0087] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0088] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0090] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0091] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0092] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0093] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0094] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 3. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 3 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0095] In some embodiments, the electrode assembly 5 further includes an isolator disposed between the positive and negative electrodes.

[0096] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0097] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular restrictions.

[0098] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0099] In some embodiments, the battery cell 3 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0100] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0101] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0102] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0103] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0104] The electrode assembly 5 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0105] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0106] In some embodiments, the electrode assembly 5 is a stacked structure.

[0107] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0108] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0109] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0110] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0111] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0112] In some embodiments, the electrode assembly 5 may be cylindrical, flat, or polygonal in shape.

[0113] In some embodiments, the electrode assembly 5 is provided with tabs 51, which can conduct current from the electrode assembly 5. The tabs 51 include a positive tab and a negative tab.

[0114] The battery cell 3 may include a housing 4. The internal environment formed by the housing 4 can be used to house the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 4 can be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. Exemplarily, the housing 4 can be a sealed bag for encapsulating the electrode assembly 5 and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0115] Please refer to Figures 5, 6, 7 and 8. Figure 5 is a structural schematic diagram of a battery cell provided in one embodiment of this application; Figure 6 is a cross-sectional view of a battery cell in Figure 5 at point AA in one embodiment of this application; Figure 7 is a front view of a battery cell provided in one embodiment of this application; and Figure 8 is a front view of a battery cell provided in another embodiment of this application.

[0116] In a first aspect, as shown in Figures 5 to 8, this application provides a battery cell 3, which includes a housing 4, an electrode assembly 5, and an adsorption layer 6. The housing 4 includes two packaging films 41, which are connected to each other to form a chamber 42. The electrode assembly 5 is housed in the chamber 42. The adsorption layer 6 is disposed on at least a portion of the surface of at least one packaging film 41 facing the electrode assembly 5, and the adsorption layer 6 is used to adsorb at least a portion of the gas in the chamber 42.

[0117] In the embodiment of this application, the battery cell 3 includes a casing 4, an electrode assembly 5, and an adsorption layer 6. The casing 4 includes two packaging films 41, which are connected to each other to form a chamber 42. The electrode assembly 5 is housed in the chamber 42 for electrochemical reaction. The adsorption layer 6 is disposed on at least a portion of the surface of at least one packaging film 41 facing the electrode assembly 5 to reduce the size between the adsorption layer 6 and the chamber 42, thereby facilitating gas contact between the adsorption layer 6 and the gas in the chamber 42. The adsorption layer 6 can adsorb at least a portion of the gas in the chamber 42, thereby reducing the risk of these gases escaping to the outside and causing adverse effects on the external environment, and improving the reliability of the battery cell 3.

[0118] Optionally, as shown in Figure 8, the outer shell 4 includes two packaging films 41 disposed opposite to each other. The two packaging films 41 are independent of each other and connected to each other at their edges so that the central region can form a sealed chamber 42 for accommodating the electrode assembly 5. The positive electrode tab 51 and the negative electrode tab 51 are disposed on the same side of the electrode assembly 5, or the positive electrode tab 51 and the negative electrode tab 51 are disposed opposite to each other on both sides of the electrode assembly 5; or as shown in Figure 7, the outer shell 4 is formed from a single substrate, which is bent along a fold line to form the two packaging films 41. The edges of the two packaging films 41 are connected to each other to form a sealed chamber 42. The positive electrode tab 51 and the negative electrode tab 51 are disposed on the same side of the electrode assembly 5.

[0119] Optionally, the shapes of the two packaging films 41 can be designed independently. For example, the packaging film 41 is rectangular. The surface areas of the two packaging films 41 can be the same or different.

[0120] Optionally, the packaging film 41 can be made of aluminum-plastic film, steel-plastic film, or other metal-plastic film.

[0121] Optionally, the two packaging films 41 can be connected by heat fusion or adhesive bonding.

[0122] The chamber 42 is also filled with an electrolyte, for example a sulfide solid electrolyte, which can decompose within the chamber 42 to produce hydrogen sulfide gas.

[0123] An adsorption layer 6 is disposed on the side of the packaging film 41 facing the electrode assembly 5 in its thickness direction, so that the adsorption layer 6 can adsorb at least part of the gas in the chamber 42 before it escapes into the external environment, thereby reducing the risk of adverse effects on the external environment. Adverse effects on the external environment may refer to the gas causing environmental pollution or harming human health.

[0124] Optionally, the adsorption layer 6 adsorbs gas molecules through physical adsorption. Physical adsorption refers to the adsorption phenomenon that occurs between the adsorbate (the substance being adsorbed) and the adsorbent (the material that adsorbs other substances) through intermolecular forces (also called van der Waals forces).

[0125] Optionally, the adsorption layer 6 adsorbs gas molecules through physical adsorption. The adsorption layer 6 will not react with the electrolyte or the gas produced by the electrolyte, thus reducing the risk of the adsorption layer 6 interfering with the electrochemical reaction within the electrolyte.

[0126] Optionally, the adsorption layer 6 is disposed on one packaging film 41 to reduce the processing difficulty of the adsorption layer 6, or the adsorption layer 6 is disposed on two packaging films 41 to enhance the adsorption efficiency of the adsorption layer 6.

[0127] Optionally, the shape of the adsorption layer 6 can be designed by the user. For example, the adsorption layer 6 can be rectangular or circular, etc.

[0128] Optionally, the size of the adsorption layer 6 can be designed independently. For example, the adsorption layer 6 covers the entire surface of the packaging film 41 in its thickness direction toward the electrode assembly 5 to increase the surface area of ​​the adsorption layer 6 and improve the adsorption reliability of the adsorption layer 6.

[0129] Optionally, the adsorption layer 6 can be combined with the packaging film 41 by coating, deposition or bonding.

[0130] In some embodiments, as shown in Figures 5 and 6, the adsorption layer 6 comprises a metal-organic framework material, and the adsorption layer 6 is used to adsorb hydrogen sulfide gas in the chamber 42.

[0131] In these embodiments, by setting a metal-organic framework material in the packaging film 41 to adsorb hydrogen sulfide gas generated by the electrolyte, the risk of hydrogen sulfide gas escaping to the outside environment and causing adverse effects on the external environment is reduced, thereby improving the reliability of the battery cell 3.

[0132] Optionally, the electrolyte is a sulfide solid electrolyte with high ionic conductivity, which helps improve the performance of the battery cell 3. However, this electrolyte may decompose to produce hydrogen sulfide gas. The metal-organic framework material can be a metal-organic framework molecular sieve nanosheet. This molecular sieve nanosheet material can maximize the exposure of the (001) crystal facet, which has the function of selectively enhancing hydrogen sulfide transport and adsorbing hydrogen sulfide. Thus, by setting this adsorption layer 6 on the packaging film 41, the risk of hydrogen sulfide gas escaping to the outside world and causing adverse effects on the external environment can be reduced. Alternatively, the metal-organic framework material can be a metal ion salt.

[0133] For example, metal-organic framework molecular sieve nanosheets can be AlFFIVE-1-Ni molecular sieve nanosheets, AlFFIVE-1-Cu molecular sieve nanosheets, AlFFIVE-1-Co molecular sieve nanosheets, AlFFIVE-1-Fe molecular sieve nanosheets, AlFFIVE-1-Zn molecular sieve nanosheets, AlFFIVE-1-Ca molecular sieve nanosheets, etc.

[0134] Please refer to Figures 9 and 10. Figure 9 is a cross-sectional view of a battery cell according to one embodiment of this application at point BB in Figure 7; Figure 10 is a cross-sectional view of a battery cell according to another embodiment of this application at point BB in Figure 7.

[0135] In some embodiments, the packaging film 41 includes a main body portion 431 and a sealing portion 432 extending from the main body portion 431. The sealing portions 432 of the two packaging films 41 are connected to each other so that the two main bodies 431 form a chamber 42. An adsorption layer 6 is disposed on at least a portion of the sealing portion 432 and / or an adsorption layer 6 is disposed on at least a portion of the main body portion 431.

[0136] In these embodiments, as shown in Figures 7 to 10, the packaging film 41 includes a main body 431 and a sealing portion 432 extending from the main body 431. The sealing portions 432 of the two packaging films 41 are connected to each other so that the two main bodies 431 form a chamber 42. The adsorption layer 6 disposed on the main body 431 can more easily adsorb the gas in the chamber 42 to reduce the risk of the gas in the chamber 42 escaping to the external environment, and / or the adsorption layer 6 is disposed on the sealing portion 432 to block at least part of the path through which the gas escapes to the external environment, thereby reducing the risk of the gas in the chamber 42 causing adverse effects on the external environment and improving the reliability of the battery cell 3.

[0137] The sealing portion 432 extends out of the main body portion 431 and is disposed around the edge of the main body portion 431. The sealing portions 432 of the two packaging films 41 are connected to each other so that the cavity 42 is formed between the two main body portions 431.

[0138] Optionally, the shapes of the main body 431 and the edge sealing portion 432 can be designed independently. For example, the main body 431 and the edge sealing portion 432 are rectangular.

[0139] For example, as shown in FIG8, the main body 431 is rectangular, and the rectangle includes two long sides arranged opposite each other in its width direction and two short sides arranged opposite each other in its length direction. The two packaging films 41 are independent of each other, and the sealing edge 432 extends out of the two long sides and two short sides of the main body 431; or as shown in FIG7, the two packaging films 41 are bent from the same substrate, and the fold line is located between the short sides of the two main bodies 431, then the sealing edge 432 extends out of one short side and two long sides; or the two packaging films 41 are bent from the same substrate, and the fold line is located between the long sides of the two main bodies 431, then the sealing edge 432 extends out of one long side and two short sides.

[0140] Optionally, the edge banding 432 can be connected by adhesive bonding or hot-melt bonding.

[0141] Compared to the main body 431, the gas in the chamber 42 is more likely to leak into the external environment from the connection of the sealing portions 432 of the two packaging films 41. Therefore, in this embodiment of the application, as shown in FIG10, the adsorption layer 6 can be disposed on the sealing portion 432 to block the path of gas leakage to the external environment.

[0142] Optionally, the adsorption layer 6 is provided only on the sealing edge 432 of one packaging film 41 to reduce the difficulty of setting the adsorption layer 6; or the adsorption layer 6 is provided on the sealing edge 432 of two packaging films 41, and the two adsorption layers 6 are spaced apart from each other to facilitate the adjustment of the position of the adsorption layer 6; or the adsorption layer 6 is provided on the sealing edge 432 of two packaging films 41, and the two adsorption layers 6 at least partially overlap, which helps to reduce the thickness of a single adsorption layer 6 in the overlapping part.

[0143] As shown in Figure 9, when the adsorption layer 6 is disposed on the main body 431, the contact area between the adsorption layer 6 and the environment inside the chamber 42 is larger, and the adsorption layer 6 can more easily adsorb the gas inside the chamber 42.

[0144] Optionally, the main body 431 has a larger surface area, so when the adsorption layer 6 is disposed on the main body 431, the area of ​​the adsorption layer 6 can be set to be larger, so that the adsorption layer 6 can adsorb more gas in the chamber 42.

[0145] Optionally, the adsorption layer 6 covers the entire main body 431, thereby increasing the adsorption effect of the adsorption layer 6 by increasing its surface area.

[0146] Optionally, the main body 431 includes a large surface area corresponding to the large surface and a bending area connecting the large surface area and the sealing edge 432. The adsorption layer 6 is disposed in the large surface area to reduce the risk that part of the adsorption layer 6 will peel off and enter the cavity 42 during the process of the two packaging films 41 being connected to each other and the main body 431 being bent.

[0147] Optionally, when the adsorption layer 6 is disposed on the main body 431 and the edge sealing part 432, the adsorption layer 6 located on the main body 431 and the adsorption layer 6 located on the edge sealing part 432 are connected to each other to increase the disposed area of ​​the adsorption layer 6; or the adsorption layer 6 located on the main body 431 and the adsorption layer 6 located on the edge sealing part 432 are disposed alternately to facilitate adjustment of the disposed position of the adsorption layer 6.

[0148] In some embodiments, as shown in FIG9, the main body portion 431 of both packaging films 41 is provided with an adsorption layer 6.

[0149] In these embodiments, the chamber 42 is provided with an electrolyte, and the main body 431 of both packaging films 41 is provided with an adsorption layer 6 so that the gas generated by the electrolyte on both sides in its thickness direction can be adsorbed by the adsorption layer 6, thereby improving the reliability of the adsorption layer 6.

[0150] The solid electrolyte structure inside the chamber 42 is dense, and the solid electrolyte and the packaging film 41 are tightly bonded. As a result, the gas generated on both sides of the solid electrolyte in the thickness direction is not easy to pass through the solid electrolyte and the gap between the electrolyte and the packaging film 41. Based on this, an adsorption layer 6 is provided on the main body 431 of the two packaging films 41, which can effectively adsorb the gas generated on both sides of the solid electrolyte and improve the reliability of the adsorption layer 6.

[0151] Optionally, the adsorption layers 6 disposed on the two main body portions 431 are of the same size, and the shapes of the adsorption layers 6 disposed on the two main body portions 431 can be designed by the user. For example, both adsorption layers 6 disposed on the two main body portions 431 are rectangular, or the adsorption layer 6 of one main body portion 431 is rectangular and the adsorption layer 6 of the other main body portion 431 is circular.

[0152] Please refer to Figure 11, which is a partial structural schematic diagram of a battery cell according to another embodiment of this application.

[0153] In some embodiments, as shown in Figures 10 and 11, the adsorption layer 6 is disposed on the sealing portion 432, and the adsorption layer 6 is disposed around the main body portion 431.

[0154] In these embodiments, the adsorption layer 6 is disposed on the sealing portion 432 and surrounds the main body portion 431 to block the path of gas escaping to the external environment through the sealing portion 432, thereby reducing the risk of gas in the chamber 42 causing adverse effects on the external environment and improving the reliability of the battery cell 3.

[0155] Optionally, the adsorption layer 6 is provided to extend continuously in the extending direction of the sealing portion 432, so that the adsorption layer 6 surrounds the main body portion 431, and the extending direction of the sealing portion 432 is the circumferential direction of the main body portion 431.

[0156] For example, the adsorption layer 6 extends along a straight path in the extension direction of the sealing portion 432 to reduce the size of the adsorption layer 6 and reduce the manufacturing cost of the battery cell 3; or the adsorption layer 6 extends along a curved or broken path in the extension direction of the sealing portion 432 to increase the surface area of ​​the adsorption layer 6 and improve the reliability of the adsorption layer 6.

[0157] For example, the adsorption layer 6 is deposited on one packaging film 41 and disposed around the main body 431; or the adsorption layer 6 is disposed on two packaging films 41, and during the connection of the two packaging films 41, the adsorption layers 6 disposed on the two packaging films 41 are connected to each other to surround the main body 431.

[0158] Optionally, the adsorption layer 6 is disposed on the entire sealing portion 432. By increasing the area of ​​the adsorption layer 6, the adsorption effect of the adsorption layer 6 is enhanced.

[0159] Please refer to Figure 12, which is a cross-sectional view of a battery cell in Figure 7 at point BB, according to another embodiment of this application.

[0160] In some embodiments, as shown in Figures 10 to 12, the sealing portion 432 includes a first region 441 and a second region 442 arranged along the width direction of the sealing portion 432, and the adsorption layer 6 is disposed in the first region 441 or the second region 442.

[0161] In these embodiments, the sealing portion 432 includes a first region 441 and a second region 442 arranged along the width direction of the sealing portion 432. An adsorption layer 6 is provided on one of the first region 441 and the second region 442 to adsorb the gas in the chamber 42. On the other of the first region 441 and the second region 442, the two packaging films 41 are directly connected to each other to improve the connection reliability of the two sealing portions 432.

[0162] The width direction of the edge sealing portion 432 is the same as the extension direction of the edge sealing portion 432 away from the main body portion 431.

[0163] The adsorption layer 6 is disposed in the first region 441 or the second region 442, or in other words, in the width direction of the sealing portion 432. The size of the adsorption layer 6 is smaller than the size of the sealing portion 432.

[0164] When the adsorption layer 6 is disposed on the sealing portion 432, the two sealing portions 432 are indirectly connected together through the adsorption layer 6 during the heat fusion connection process of the sealing portions 432. Within a unit area, the connection strength between the two packaging films 41 connected by the adsorption layer 6 is less than the connection strength between the two packaging films 41 directly connected. Therefore, a first region 441 and a second region 442 are provided along the width direction of the sealing portion 432 so that when the adsorption layer 6 is disposed on the sealing portion 432, the extension dimension of the sealing portion 432 is reduced while satisfying the overall connection strength between the two packaging films 41, thereby increasing the energy density of the battery cell 3.

[0165] For example, the adsorption layer 6 is disposed in the first region 441, the adsorption layer 6 is located between two first regions 441, the two packaging films 41 are directly connected in the second region 442, or the adsorption layer 6 is disposed in the second region 442, the adsorption layer 6 is located between two second regions 442, the two packaging films 41 are connected to each other in the first region 441 to strengthen the connection strength of the two packaging films 41.

[0166] Optionally, the shape and size of the first region 441 and the second region 442 can be designed independently. For example, both the first region 441 and the second region 442 are rectangular.

[0167] Optionally, the first region 441 is disposed between the second region 442 and the main body 431, and the adsorption layer 6 is disposed in the second region 442, so that after the gas in the chamber 42 leaks through the first region 441, it can be adsorbed by the adsorption layer 6 in the second region 442, thereby reducing the risk of gas leakage to the external environment.

[0168] In some embodiments, as shown in Figures 10 to 12, a second region 442 is disposed between a first region 441 and a main body portion 431, and an adsorption layer 6 is disposed in the second region 442.

[0169] In these embodiments, the adsorption layer 6 is disposed in the second region 442, and the adsorption layer 6 is disposed close to the chamber 42. Two packaging films 41 are directly connected in the first region 441 to separate the adsorption layer 6 from the external environment, thereby reducing the risk of the adsorption layer 6 peeling off or breaking due to external forces during the transportation or use of the battery cell 3, and improving the reliability of the adsorption layer 6.

[0170] The second region 442 is located between the first region 441 and the main body 431. The distance between the adsorption layer 6 and the chamber 42 is smaller, and the adsorption layer 6 can more easily adsorb the gas in the chamber 42. The adsorption layer 6 is separated from the external environment by the first region 441, which reduces the risk of the adsorption layer 6 peeling off and breaking due to scratches and collisions.

[0171] Optionally, the shape and size of the first region 441 and the second region 442 can be designed by the user. For example, both the first region 441 and the second region 442 are rectangular.

[0172] Optionally, the second region 442 is disposed along the extension direction of the edge sealing portion 432 throughout the entire edge sealing portion 432, the second region 442 is disposed around the main body portion 431, and the first region 441 is disposed around the second region 442.

[0173] In some embodiments, as shown in Figures 5 and 12, the adsorption layer 6 is disposed on at least a portion of the sealing portion 432, the width dimension L1 of the sealing portion and the dimension L2 of the adsorption layer 6 in the width direction of the sealing portion 432 satisfy 0.5*L1≤L2≤L1.

[0174] In these embodiments, when the size of the adsorption layer 6 in the width direction of the sealing portion 432 meets the above conditions, the problem of insufficient adsorption capacity of the adsorption layer 6 due to its small size is improved.

[0175] Optionally, the adsorption layer 6 covers the entire sealing portion 432, with L2 = L1, to improve the adsorption reliability of the adsorption layer 6.

[0176] For example, the width dimension L1 of the sealing portion 432 and the dimension L2 of the adsorption layer 6 in the width direction of the sealing portion 432 can be 0.5*L1, 0.6*L1, 0.7*L1, 0.8*L1, 0.9*L1, or L1, etc.

[0177] Optionally, in the width direction of the sealing portion 432, the size of the adsorption layer 6 can be the size of the second region 442.

[0178] In some embodiments, as shown in Figures 5 and 12, the width dimension L1 of the sealing portion 432 satisfies 0.3cm≤L1≤1cm, and the dimension L2 of the adsorption layer 6 in the width direction of the sealing portion 432 satisfies 0.15cm≤L2≤1cm.

[0179] In these embodiments, when the size of the adsorption layer 6 in the width direction of the sealing portion 432 meets the above conditions, the problem of insufficient adsorption capacity of the adsorption layer 6 due to its small size is improved.

[0180] For example, the width dimension L1 of the sealing portion 432 can be 0.3cm, 0.4cm, 0.6cm, 0.7cm, 0.8cm or 1.0cm, etc.; the dimension L2 of the adsorption layer 6 in the width direction of the sealing portion 432 can be 0.15cm, 0.2cm, 0.3cm, 0.35cm, 0.4cm, 0.5cm, 0.7cm or 1.0cm, etc.

[0181] In some embodiments, as shown in Figures 5 and 12, the thickness D1 of the packaging film 41 and the thickness D2 of the adsorption layer 6 satisfy 0.004*D1≤D2≤0.02*D1.

[0182] In these embodiments, when the thickness of the adsorption layer 6 meets the above conditions, it not only improves the problem of insufficient adsorption capacity of the adsorption layer 6 due to its thinness, but also improves the problem of excessively high cost of battery cell 3 and excessively low energy density of battery cell 3 due to its excessively thick adsorption layer 6.

[0183] For example, the thickness D1 of the packaging film 41 and the thickness D2 of the adsorption layer 6 are 0.004*D1, 0.006*D1, 0.01*D1, 0.015*D1, or 0.02*D1.

[0184] In some embodiments, as shown in Figures 5 and 12, the thickness D1 of the packaging film 41 satisfies 0.3 mm ≤ D1 ≤ 0.7 mm, and the thickness D2 of the adsorption layer 6 satisfies 1.2 μm ≤ D2 ≤ 14 μm.

[0185] In these embodiments, when the thickness of the adsorption layer 6 meets the above conditions, it not only improves the problem of insufficient adsorption capacity of the adsorption layer 6 due to its thinness, but also improves the problem of excessively high cost of battery cell 3 and excessively low energy density of battery cell 3 due to its excessively thick adsorption layer 6.

[0186] For example, the thickness D1 of the packaging film 41 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or 0.7 mm, etc.; the thickness D2 of the adsorption layer 6 is 1.2 μm, 2 μm, 3 μm, 5 μm, 7.5 μm, 10 μm or 14 μm, etc.

[0187] Secondly, this application provides a battery device including the battery cell described in the first aspect embodiment above.

[0188] Thirdly, this application provides an electrical device including the battery device described in the second aspect embodiment above.

[0189] In some embodiments, as shown in Figures 1 to 12, the battery cell 3 includes a housing 4, an electrode assembly 5, and an adsorption layer 6. The housing 4 includes two packaging films 41, each including a main body 431 and a sealing portion 432 extending from the main body 431. The sealing portions 432 of the two packaging films 41 are connected to each other so that the two main bodies 431 form a chamber 42. The electrode assembly 5 is housed within the chamber 42. The adsorption layer 6 includes metal-organic framework molecular sieve nanosheets. The adsorption layer 6 is used to adsorb hydrogen sulfide gas within the chamber 42. In the extending direction of the sealing portion 432, the adsorption layer 6 is disposed on at least one packaging film 41 facing the battery cell. At least a portion of the surface of the electrode component 5, the adsorption layer 6 is disposed on the entire sealing portion 432, and / or the surface area of ​​the main body portion 431 is greater than the surface area of ​​the sealing portion 432, the adsorption layer 6 is disposed on both main body portions 431, the adsorption layer 6 is disposed on at least a portion of the sealing portion 432, the width dimension L1 of the sealing portion 432 satisfies 0.3cm≤L1≤1cm, the dimension L2 of the adsorption layer 6 in the width direction of the sealing portion 432 satisfies 0.15cm≤L2≤1cm, the thickness D1 of the packaging film 41 satisfies 0.3mm≤D1≤0.7mm, and the thickness D2 of the adsorption layer 6 satisfies 1.2μm≤D2≤14μm.

[0190] In these embodiments, the battery cell 3 includes a housing 4, an electrode assembly 5, and an adsorption layer 6. The housing 4 includes two packaging films 41 connected to each other to form a chamber 42. The electrode assembly 5 is housed within the chamber 42 for electrochemical reactions. The adsorption layer 6 is disposed on at least a portion of the surface of at least one packaging film 41 facing the electrode assembly 5 to reduce the size between the adsorption layer 6 and the chamber 42, thereby facilitating gas contact between the adsorption layer 6 and the gas within the chamber 42. The adsorption layer 6 is capable of adsorbing at least a portion of the gas within the chamber 42, thereby reducing the risk of these gases escaping to the outside environment and causing adverse effects, thus improving the reliability of the battery cell 3.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 single battery cell, comprising: The outer shell includes two packaging films, which are connected to each other to form a cavity; Electrode assembly, housed within the cavity; An adsorption layer is disposed on at least a portion of the surface of at least one of the packaging films facing the electrode assembly, the adsorption layer being used to adsorb at least a portion of the gas within the chamber.

2. The battery cell according to claim 1, wherein, The packaging film includes a main body and a sealing portion extending from the main body. The sealing portions of two packaging films are connected to each other so that the two main bodies form the chamber. The adsorption layer is disposed on at least a portion of the sealing portion, and / or the adsorption layer is disposed on at least a portion of the main body portion.

3. The battery cell according to claim 2, wherein, The main body of both packaging films is provided with the adsorption layer.

4. The battery cell according to claim 2, wherein, The adsorption layer is disposed on the sealing portion and surrounds the main body portion.

5. The battery cell according to claim 2 or 4, wherein, The sealing portion includes a first region and a second region arranged along the width direction of the sealing portion, and the adsorption layer is disposed in the first region or the second region.

6. The battery cell according to claim 5, wherein, The second region is disposed between the first region and the main body, and the adsorption layer is disposed in the second region.

7. The battery cell according to claim 2, wherein, The adsorption layer is disposed on at least a portion of the sealing portion, the width dimension L1 of the sealing portion and the dimension L2 of the adsorption layer in the width direction of the sealing portion satisfying 0.5*L1≤L2≤L1.

8. The battery cell according to claim 7, wherein, The width dimension L1 of the sealing portion satisfies 0.3cm≤L1≤1cm, and the dimension L2 of the adsorption layer in the width direction of the sealing portion satisfies 0.15cm≤L2≤1cm.

9. The battery cell according to any one of claims 1-8, wherein, The thickness D1 of the packaging film and the thickness D2 of the adsorption layer satisfy 0.004*D1≤D2≤0.02*D1.

10. The battery cell according to claim 9, wherein, The thickness D1 of the packaging film satisfies 0.3mm≤D1≤0.7mm, and the thickness D2 of the adsorption layer satisfies 1.2μm≤D2≤14μm.

11. The battery cell according to any one of claims 1-10, wherein, The adsorption layer comprises a metal-organic framework material and is used to adsorb hydrogen sulfide gas generated in the chamber.

12. A battery device comprising a battery cell as described in any one of claims 1-11.

13. An electrical device comprising the battery device as described in claim 12.

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