Battery monomer, battery device and power utilization device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a shell, an electrode assembly and a supporting part; the shell is provided with a containing cavity, the electrode assembly is located in the containing cavity and comprises a straight section and corner sections, and the corner sections are connected to the two ends of the straight section in the first direction; the supporting component at least partially covers the outer side of the electrode assembly; the thickness of the supporting part on the straight section is at least partially larger than the thickness of the supporting part on the corner section. The lithium precipitation phenomenon of the electrode assembly in the working process of the battery monomer can be reduced, and the safety of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have become increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] In the development of battery technology, reducing lithium plating in individual battery cells is a key research direction. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can reduce lithium plating in the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and a support member; the housing has a receiving cavity, the electrode assembly is located in the receiving cavity, the electrode assembly includes a straight section and a corner section, the corner section is connected to both ends of the straight section along a first direction; the support member at least partially covers the outside of the electrode assembly; the thickness of the support member in the straight section is at least partially greater than the thickness of the support member in the corner section.

[0006] In the above scheme, the support component covers the outside of the electrode assembly, and the thickness of the support component located on the straight section of the electrode assembly is greater than the thickness of the support component located on the corner section of the electrode assembly. When the battery cell expands during charging, the thicker support component is more likely to abut against the outer casing, and the outer casing applies force to the electrode assembly, forming a clamping effect. This results in a tighter fit between the electrode layers within the electrode assembly, thereby reducing lithium plating caused by wrinkling of the electrode sheets due to the restriction of the expansion space along the first direction by the corner adhesion area during battery cell operation, and improving safety.

[0007] In some embodiments, the support member continuously covers the electrode assembly along the winding direction of the electrode assembly.

[0008] In the above scheme, the support component continuously wraps around the electrode assembly along the winding direction of the electrode assembly. The support component is not easily deformed and can apply a uniform wrapping force to the entire electrode assembly, reducing lithium plating caused by uneven stress and wrinkling of the outer electrode sheet of the electrode assembly. Furthermore, the straight sections of the electrode assembly that are prone to lithium plating can be covered with protective components. When the battery expands, the protective components can first abut against the outer shell, and the outer shell applies a force to the straight sections of the entire electrode assembly, making the clamping force on the electrode assembly more uniform.

[0009] In some embodiments, the support member protrudes towards the housing. This allows the support member to conform to the surface of the electrode assembly facing the housing, providing a uniform covering force on the outer ring of the electrode assembly and resulting in a more even clamping force on the electrode assembly. This also reduces stress concentration issues that may exist at the contact surface between the support member and the electrode assembly when the support member protrudes towards the electrode assembly.

[0010] In some embodiments, the support member includes a first part and a second part, the first part being disposed corresponding to a straight section and the second part being disposed corresponding to a corner section, wherein the thickness of the first part is at least partially greater than the thickness of the second part.

[0011] In the above solution, the supporting component covering the straight section is thicker than that covering the corner section. This makes it easier for the supporting component covering the straight section to abut against the outer casing, thus applying a force through the casing to the supporting component and creating a clamping effect in the thickness direction of the electrode assembly. Furthermore, lithium plating is more likely to occur in the straight section during battery cell charging. Therefore, this embodiment can more specifically address the lithium plating problem in the straight section.

[0012] In some embodiments, the thickness of the first part is greater than the thickness of the second part. This makes it easier for the support member covering the straight section to abut against the outer casing, thus more effectively addressing the problem of lithium plating in the straight section.

[0013] In some embodiments, along the first direction, the thickness of the first part away from the corner segment is greater than the thickness of the first part near the corner segment.

[0014] In the above scheme, along the first direction, the thickness of the middle region of the first part is the greatest, and the thickness of the first part decreases as it approaches the corner. The middle region of the first part is more likely to abut against the outer shell, and the outer shell applies a force to the first part, thus creating a clamping effect on the electrode assembly in the thickness direction. Since the expansion space of the straight section is limited by the adhesive area of ​​the corner section when it expands along the first direction, the straight section is more prone to lithium plating due to wrinkling the further it is from the corner section. Therefore, the first part can apply targeted force to the areas that are more prone to wrinkling.

[0015] In some embodiments, along the second direction, the thickness of the first part near the middle region of the electrode assembly is greater than the thickness of the first part near the edge region of the electrode assembly, and the second direction is the winding axis direction of the electrode assembly.

[0016] In the above scheme, along the second direction, the thickness of the edge of the first part is less than the thickness of the middle area. The first part is arc-shaped or at an angle, which can guide it into the shell and to a certain extent avoid the shell from scratching the supporting components.

[0017] In some embodiments, the point of maximum thickness of the first part coincides with the center point of the straight section.

[0018] In the above scheme, the support component in the central area of ​​the straight section is the thickest. The support component here first abuts against the outer shell, which can apply targeted force to areas that are more prone to wrinkling. The force applied by the outer shell to the support component creates a clamping effect on the electrode assembly in the thickness direction. The support component is thicker and less prone to deformation. Applying clamping force at the center can make the force on the entire straight section more uniform.

[0019] In some embodiments, the first portions on both sides of the straight section are symmetrically arranged along the thickness direction of the electrode assembly.

[0020] In the above solution, the electrode assembly facing the outer shell is covered with a support component, and the support component is correspondingly provided to avoid the electrode assembly shifting and pulling the electrode tab due to the difference in thickness at two points.

[0021] In some embodiments, the support member includes at least a protective layer and a thermally conductive layer, with the thermally conductive layer located between two adjacent protective layers.

[0022] In the above solution, the support component has a multi-layer structure, with a heat-conducting layer in the middle of the protective layer. The heat-conducting layer can be filled with heat-conducting material. It can play the role of clamping the electrode assembly without the need for customized locally thickened support components. The process is simple and easier to operate.

[0023] In some embodiments, the support member includes a first part and a second part, the first part being disposed corresponding to the straight section and the second part being disposed corresponding to the corner section, the first part including a protective layer and a heat-conducting layer, the heat-conducting layer being located between two adjacent protective layers.

[0024] In the above solution, the first part is a multi-layer structure, with a thermally conductive layer in the middle of the protective layer. The thermally conductive layer can be filled with thermally conductive material, which can play the role of clamping the electrode assembly without the need for customized locally thickened support components. The process is simple and easier to operate. It can also be used to specifically cover the straight sections that are more prone to wrinkling and lithium plating, and apply a uniform clamping force to the electrode assembly through the shell.

[0025] In some embodiments, along the first direction, the thickness of the heat-conducting layer away from the corner segment is greater than the thickness of the heat-conducting layer near the corner segment.

[0026] In the above scheme, the thickness of the thermally conductive layer is greatest in the middle along the first direction, and decreases as it approaches the corner. The middle region of the first part, which consists of the protective layer and the thermally conductive layer, is more likely to abut against the outer shell, and the outer shell applies a force to the first part, thus creating a clamping effect on the electrode assembly in the thickness direction. Since the expansion space of the straight section along the first direction is limited by the adhesive area of ​​the corner section when it expands, the further the straight section is from the corner section, the more prone it is to wrinkling and lithium plating. Therefore, the support component composed of the thermally conductive layer and the protective layer can apply targeted force to the more wrinkle-prone areas.

[0027] In some embodiments, along the second direction, the thickness of the thermally conductive layer near the middle region of the electrode assembly is greater than the thickness of the thermally conductive layer near the edge region of the electrode assembly, and the second direction is the direction of the winding axis of the electrode assembly.

[0028] In the above scheme, along the second direction, the thickness of the edge of the heat-conducting layer is less than the thickness of the middle area. The heat-conducting layer is arc-shaped or at an angle, which can guide it into the shell and to a certain extent prevent the shell from scratching the supporting components.

[0029] In some embodiments, the material of the support component includes an elastic material.

[0030] In the above scheme, the support component is made of elastic material, which can absorb and mitigate external impact forces when the battery cell is subjected to vibration and impact, and provide buffer protection for the electrode assembly.

[0031] In some embodiments, the thermal conductivity of the support component is greater than that of the electrode assembly.

[0032] In the above scheme, the supporting component is made of thermally conductive material. The supporting component can optimize the temperature uniformity inside the electrode assembly and accelerate the heat transfer efficiency inside the electrode assembly.

[0033] In some embodiments, the thickness of the support member is D, where 0 < D ≤ 6 mm.

[0034] In the above scheme, the thickness of the supporting component is limited to between 0 and 6 mm, leaving a certain expansion space for the electrode assembly.

[0035] In some embodiments, the battery cell further includes a protective component that at least partially covers the side of the support component away from the electrode assembly, and the rigidity of the protective component is greater than that of the support component.

[0036] In the above scheme, a protective component is provided outside the supporting component. The protective component can increase the strength of the electrode assembly, add a layer of protection to the electrode assembly, and reduce the failure of the electrode assembly when it is punctured or due to compression and collision.

[0037] In some embodiments, the protective component is an insulating material.

[0038] In the above scheme, the protective component is made of insulating material, which can serve as a protective layer to effectively block the conductive path between the outer casing and the electrode assembly, preventing short circuits from occurring.

[0039] In some embodiments, the hardness of the protective component is greater than that of the outer shell.

[0040] In the above scheme, the protective component is made of a rigid material with a hardness greater than that of the outer shell. This allows a protective layer to be formed on the outside of the electrode assembly, reducing the likelihood of the electrode assembly failing due to compression or puncture.

[0041] Secondly, embodiments of this application provide a battery device including a battery cell of any of the above embodiments.

[0042] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above embodiments, the battery device being used to provide electrical energy.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a vehicle disclosed in one embodiment of this application;

[0046] Figure 2 This is an exploded structural diagram of a battery pack disclosed in an embodiment of this application;

[0047] Figure 3 This is a partial structural schematic diagram of a battery module disclosed in an embodiment of this application;

[0048] Figure 4 This is a partial structural schematic diagram of a battery cell disclosed in an embodiment of this application;

[0049] Figure 5 This is a partial structural schematic diagram of a battery cell disclosed in an embodiment of this application;

[0050] Figure 6 This is a cross-sectional view of a battery cell disclosed in an embodiment of this application;

[0051] Figure 7 This is a partial cross-sectional view of a battery cell disclosed in an embodiment of this application;

[0052] Figure 8 This is a cross-sectional view of a battery cell disclosed in an embodiment of this application.

[0053] The accompanying drawings are not drawn to scale.

[0054] Marking description: Vehicle, 1000; Battery unit, 100; Controller, 200; Motor, 300; Battery cell, 20; Top cover, 10; Housing, 30; Battery module, 400; End cap, 21; Housing, 22; Electrode assembly, 23; Outer shell, 25; Electrode terminal, 26; Straight section, 231; Corner section, 232; Supporting component, 27; First part, 271; Second part, 272; Protective layer, 273; Thermal conductive layer, 274; Protective component, 28; First direction, X; Second direction, Y. Detailed Implementation

[0055] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0057] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 battery applications, market demand is also constantly increasing.

[0059] The development of battery technology must consider multiple design factors simultaneously, such as energy density, discharge capacity, and charge / discharge rate. Additionally, battery safety and reliability must be taken into account. However, current battery cells exhibit lithium plating during charging, resulting in relatively poor safety and reliability.

[0060] During recharging of a lithium-ion battery, lithium ions are extracted from the positive electrode and inserted into the negative electrode. However, some abnormal situations may occur, such as insufficient space for lithium insertion in the negative electrode, excessive resistance to lithium ion insertion into the negative electrode, or lithium ions being extracted from the positive electrode too quickly. If the extracted lithium ions cannot be inserted into the negative electrode in equal quantities, they can only gain electrons on the surface of the negative electrode, forming silvery-white metallic lithium—this is lithium plating. The deposited lithium may form lithium dendrites, which continue to grow over time and with charge-discharge cycles. These elongated lithium dendrites may penetrate the battery separator, causing direct contact between the positive and negative electrodes, leading to an internal short circuit. Once an internal short circuit occurs, the battery will heat up rapidly, potentially leading to thermal runaway, or even serious consequences such as battery fire or explosion.

[0061] Research has found that during charging, lithium ions embed between the graphite layers of the anode electrode, causing the anode electrode to expand in both its thickness and extension directions. In the thickness direction, the expansion of the anode electrode results in a looser stacking of the electrode layers, with the outer ring experiencing less binding force, leading to a more pronounced loose stacking. In the extension direction, the outer ring of the electrode layers is loosely stacked in the straight sections, while the layers are tightly bonded in the corner sections. The expansion length of the straight sections along the winding direction is limited by the tightly bonded areas in the corner sections, causing wrinkles to form on the expanded anode electrode. These wrinkles create gaps between the anode and cathode electrodes, preventing the electrolyte from replenishing these gaps in time. This hinders lithium ion embedding into the anode through these gaps, leading to lithium plating and compromising battery safety.

[0062] To address the aforementioned issues, this application provides a battery cell comprising a housing, an electrode assembly, and a support member. The housing has a receiving cavity, and the electrode assembly is located within the receiving cavity. The electrode assembly includes a straight section and a corner section, with the corner section connecting the two ends of the straight section along a first direction. The support member at least partially covers the outside of the electrode assembly. The thickness of the support member in the straight section is at least partially greater than the thickness of the support member in the corner section.

[0063] In the above scheme, the support component covering the straight section of the electrode assembly is thicker, less prone to deformation, and has a stronger binding force on the electrode assembly. In addition, along the thickness direction of the electrode assembly, the straight section of the electrode assembly facing the outer shell is more likely to abut against the outer shell because it is covered with the support component. The outer shell applies force to the electrode assembly, thereby forming a clamping effect. The layers of electrode sheets are more tightly bonded, the friction between the electrode sheets is increased, wrinkling is reduced, thereby reducing lithium plating and improving safety.

[0064] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0065] A single battery cell includes an electrode assembly and an electrolyte disposed within a casing. The electrodes include a positive electrode and a negative electrode, and the electrode assembly also includes a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0066] Specifically, the positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector; the positive current collector includes a positive current collection section and a positive electrode tab connected to the positive current collection section, the positive current collection section being coated with the positive active material layer, and the positive electrode tab not being coated with the positive active material layer. Taking a lithium-ion battery as an example, the positive current collector can be aluminum or a composite material containing an aluminum coating, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section, the negative current collection section being coated with the negative active material layer, and the negative electrode tab not being coated with the negative active material layer. The negative current collector can be copper or a composite material containing a copper coating, and the negative active material layer includes the negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0067] 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.

[0068] 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.

[0069] 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 this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0070] 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.

[0071] 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.

[0072] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0073] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 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 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 includes a battery housing and battery cells 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and housing 30 overlapping each other, and the top cover 10 and housing 30 together defining an accommodating space for accommodating the battery cells 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and housing 30 together define the accommodating space; the top cover 10 and housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0076] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in a housing. Of course, the battery device 100 can also be in the form of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module 400, and then multiple battery modules 400 are connected in series, parallel, or in a mixed manner to form a whole and housed in a housing. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0077] Figure 4 and Figure 5 This is an exploded structural diagram of a battery cell according to some embodiments of this application. The battery cell 20 includes a housing 25, an electrode assembly 23, and a support component 27.

[0078] A battery cell 20 refers to the smallest unit that makes up a battery. In this application, the battery cell 20 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 20 may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0079] The outer casing 25 is a component used to house the electrode assembly 23. The outer casing 25 can be a hollow structure with an opening at one end, or a hollow structure with openings at both opposite ends. The outer casing 25 can have various shapes, determined by the specific shape of the electrode assembly 23. For example, when the electrode assembly 23 is a cuboid structure, a cuboid outer casing 25 can be used; when the electrode assembly 23 is cylindrical, a cylindrical outer casing 25 can be used. The outer casing 25 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0080] In some embodiments, the housing 25 includes an end cap 21 and a housing 22. The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Not limited to this, the shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0081] In some embodiments, the end cap 21 may be provided with functional components such as electrode terminals 26. The electrode terminals 26 can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20.

[0082] In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member may also be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member may be made of plastic, rubber, etc.

[0083] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction takes place. Electrode assembly 23 may include a positive electrode, a negative electrode, and a separator. Electrode assembly 23 can be a wound structure formed by winding the positive electrode, separator, and negative electrode, or a stacked structure formed by arranging the positive electrode, separator, and negative electrode in layers.

[0084] The electrode assembly 23 may have tabs, which may be divided into positive tabs and negative tabs. The positive tab may be the part of the positive electrode sheet that is not coated with the positive active material layer, and the negative tab may be the part of the negative electrode sheet that is not coated with the negative active material layer.

[0085] Please refer to Figure 5This application provides a battery cell 20, which includes a housing 25, an electrode assembly 23, and a support member 27. The housing 25 has a receiving cavity, and the electrode assembly 23 is located in the receiving cavity. The electrode assembly 23 includes a straight section 231 and a corner section 232, and the corner section 232 is connected to both ends of the straight section 231 along a first direction X. The support member 27 at least partially covers the outside of the electrode assembly 23. The thickness of the support member 27 in the straight section 231 is at least partially greater than the thickness of the support member 27 in the corner section 232.

[0086] For the wound electrode assembly 23, it is usually squeezed after winding to make the electrode assembly 23 compact and improve its flatness. After being squeezed, the electrode assembly 23 becomes flat and includes a straight section 231 and two corner sections 232 connecting the straight section 231. The straight section 231 refers to the region of the electrode assembly 23 with a parallel structure, that is, the surfaces of the negative electrode, positive electrode, and separator within the straight section 231 are all planar. The corner section 232 refers to the region of the electrode assembly 23 with a bent structure, that is, the negative electrode, positive electrode, and separator within the corner section 232 are all bent, that is, the surfaces of each layer of negative electrode, positive electrode, and separator in the corner section 232 of the electrode assembly 23 are curved surfaces.

[0087] The support component 27 can be a film of uneven thickness. The support component 27 can be a single, integral film or composed of multiple parts. When the support component 27 is composed of multiple parts, the parts can have uneven or uniform thicknesses. The support component 27 can continuously cover the outer side of the electrode assembly 23, or it can be divided into several segments that cover the outer side of the electrode assembly 23 separately. In the winding direction of the electrode assembly 23, the parts of the support component 27 can be connected to each other to achieve a complete circle of coverage, or they can be spaced apart in the winding direction of the electrode assembly 23. To facilitate heat dissipation of the electrode assembly 23, the support component 27 can have a porous structure.

[0088] The support member 27 at least partially covers the outside of the electrode assembly 23. The support member 27 can completely cover the straight section 231 and the corner section 232, or it can only cover the entire straight section 231, or it can only cover a part of the straight section 231. In this case, the coverage area of ​​the support member 27 is at least more than half of the area of ​​the straight section 231.

[0089] The thickness of the support member 27 in the straight section 231 is at least partially greater than the thickness of the support member 27 in the corner section 232. The support member 27 in the straight section 231 can have a uniform thickness, and the overall thickness of the support member 27 in the straight section 231 is greater than that of the support member 27 in the corner section 232. Alternatively, the thickness of the support member 27 in the straight section 231 can be uneven, in which case the maximum thickness of the support member 27 in the straight section 231 is greater than that of the support member 27 in the corner section 232. By limiting the thickness of the support member 27 in the straight section 231 to be at least partially greater than that of the support member 27 in the corner section 232, the support member 27 in the straight section 231 at least partially abuts against the outer casing 25 earlier along the thickness direction of the electrode assembly 23.

[0090] The support component 27 may protrude toward the housing 25 or toward the electrode assembly 23.

[0091] In some embodiments, there may be one electrode assembly 23 within the housing 25. In this case, the support member 27 may continuously cover the entire electrode assembly 23 along the winding direction of the electrode assembly 23. In other embodiments, there may be two or more electrode assemblies within the housing 25. In this case, the support member 27 may cover the entire electrode assembly along the winding direction of the electrode assembly 23, or it may only partially cover the straight section 231 of the electrode assembly 23 facing the housing 25. The two adjacent straight sections 231 of two adjacent electrode assemblies 23 may not cover the support member 27.

[0092] In this embodiment, the support member 27 covers the outside of the electrode assembly 23. The thickness of the support member 27 located on the straight section 231 of the electrode assembly 23 is greater than the thickness of the support member 27 located on the corner section 232 of the electrode assembly 23. When the battery cell 20 expands during charging, the area with the greater thickness of the support member 27 is more likely to abut against the outer casing 25. The outer casing 25 applies a force to the electrode assembly 23, forming a clamping effect, which makes the layers of electrode sheets in the electrode assembly 23 fit more tightly. This reduces the lithium plating phenomenon caused by the expansion space of the electrode sheets along the first direction X being restricted by the adhesive area of ​​the corner section 232 when the battery cell 20 is working, thus improving safety.

[0093] In some embodiments, please refer to Figure 6 The support component 27 continuously covers the electrode assembly 23 along the winding direction of the electrode assembly 23.

[0094] The support component 27 can be a single unit that continuously covers the entire electrode assembly 23 along the winding direction of the electrode assembly 23; or the support component 27 can be several parts that are connected to each other and continuously cover the entire electrode assembly 23 along the winding direction of the electrode assembly 23.

[0095] In this embodiment, the support member 27 continuously covers the electrode assembly 23. The support member 27 is not easily deformed and can uniformly cover the entire electrode assembly 23 along the winding direction of the electrode assembly 23, avoiding lithium plating caused by uneven stress and wrinkling of the outer electrode sheet of the electrode assembly 23. Furthermore, the support member 27 can cover the straight section 231 of the electrode assembly 23, which is prone to lithium plating. The thicker area of ​​the support member 27 can first abut against the outer shell 25 when the battery expands. The outer shell 25 applies force to the straight section 231 of the entire electrode assembly 23, making the clamping force on the electrode assembly 23 more uniform.

[0096] In some embodiments, please refer to Figure 6 The supporting component protrudes toward the outer shell.

[0097] In this embodiment, the support member 27 can be attached to the surface of the electrode assembly 23, providing a uniform covering force to the outer ring of the electrode assembly 23, resulting in a more uniform clamping force on the electrode assembly. This reduces stress concentration issues that may exist at the contact surface between the support member 27 and the electrode assembly 23 when the support member 27 protrudes towards the electrode assembly 23.

[0098] In some embodiments, please refer to Figure 6 The support component 27 includes a first part 271 and a second part 272. The support component 27 corresponding to the straight section 231 is the first part 271, and the support component 27 corresponding to the corner section 232 is the second part 272. The thickness of the first part 271 is at least partially greater than the maximum thickness of the second part 272.

[0099] Specifically, the support member 27 covering the straight section 231 is thicker than the support member 27 covering the corner section 232. The first part 271 covering the straight section 231 can have a uniform thickness or an uneven thickness; the second part 272 covering the corner section 232 can have a uniform thickness or an uneven thickness. When the first part 271 has a uniform thickness, it is generally thicker than the second part 272. When the first part 271 has an uneven thickness, its maximum thickness is greater than that of the second part 272. By limiting the thickness of the first part 271 to be at least partially greater than that of the second part 272, the first part 271 at least partially abuts against the outer casing 25 first along the thickness direction of the electrode assembly 23.

[0100] In this embodiment, the support member 27 covering the straight section 231 is more likely to abut against the outer shell 25 than the support member 27 covering the corner section 232. The outer shell 25 applies force to the support member 27, thereby creating a clamping effect in the thickness direction of the electrode assembly 23. The straight section 231 is also more prone to lithium plating during the charging of the battery cell 20. Therefore, the solution in this embodiment can more specifically address the lithium plating problem in the straight section 231.

[0101] In some embodiments, please refer to Figure 6 The thickness of the first part 271 is greater than the thickness of the second part 272.

[0102] The first part 271 covering the straight section 231 can have a uniform thickness or an uneven thickness; the second part 272 covering the corner section 232 can have a uniform thickness or an uneven thickness. When the first part 271 has a uniform thickness, its overall thickness is greater than the maximum thickness of the second part 272; when the first part 271 has an uneven thickness, its minimum thickness is greater than the maximum thickness of the second part 272.

[0103] According to the battery cell 20 of the present application embodiment, the supporting component covering the straight section is more likely to abut against the outer shell, which can more effectively solve the problem of lithium plating in the straight section.

[0104] In some embodiments, please refer to Figure 6 Along the first direction X, the thickness of the first part 271 away from the corner segment 232 is greater than the thickness of the first part 271 near the corner segment 232.

[0105] Specifically, along the first direction X, the thickness of the first part 271 is greatest in the middle, and the thickness of the first part 271 decreases as it approaches the corner section 232. During the expansion of each layer of the electrode assembly 23, the expansion space of the straight section 231 along the first direction X is limited by the adhesive area of ​​the corner section 232. The further the straight section 231 is from the corner section 232, the more prone it is to lithium plating due to wrinkling.

[0106] In this embodiment, the middle region of the first part 271 is more likely to abut against the outer shell 25. The outer shell 25 applies force to the first part 271 to form a clamping effect on the electrode assembly 23 in the thickness direction. Therefore, the first part 271 can apply targeted force to areas that are more prone to wrinkling.

[0107] In some embodiments, please refer to Figure 7 Along the second direction Y, the thickness of the first part 271 near the middle region of the electrode assembly 23 is greater than the thickness of the first part 271 near the edge region of the electrode assembly 23, and the second direction Y is the winding axis direction of the electrode assembly 23.

[0108] Specifically, along the second direction Y, the thickness of the first part 271 is greatest in the middle region, and decreases as it approaches the edge of the electrode assembly 23. At this time, the first part 271 exhibits a certain slope along the second direction Y.

[0109] In this embodiment, the first part 271 has a certain slope along the second direction Y, which can guide it into the shell and prevent the shell 25 from scratching the support member 27.

[0110] In some embodiments, please refer to Figure 6 and Figure 7 The point of maximum thickness of the first section 271 coincides with the center point of the straight section 231.

[0111] Specifically, the support component 27, which is set outside the central area of ​​the straight section 231, has the greatest thickness. Along the first direction X, the closer it is to the corner section 232, the thinner the support component 27 becomes. Along the second direction Y, the closer it is to the edge of the electrode assembly 23, the thinner the support component 27 becomes.

[0112] In this embodiment, the support member 27 in the central region of the straight section 231 is the thickest. The support member 27 here first abuts against the outer shell 25, which can apply targeted force to areas that are more prone to wrinkling. The force applied by the outer shell 25 to the support member 27 forms a clamping effect on the electrode assembly 23 in the thickness direction. Moreover, the support member 27 is thicker and less prone to deformation. Applying clamping force in the central region of the straight section 231 can make the force on the entire straight section 231 more uniform.

[0113] In some embodiments, please refer to Figure 6 and Figure 7 Along the thickness direction of electrode assembly 23, the first part 271 on both sides of the straight section 231 is symmetrically arranged.

[0114] Specifically, along the thickness direction of the electrode assembly 23, the straight sections 231 on both sides of the outer shell 25 cover the support member 27. The thicknesses of the two first parts 271 are equal, and the two highest thicknesses of the first parts 271 are correspondingly set on a straight line parallel to the thickness direction of the electrode assembly 23.

[0115] In this embodiment, the electrode assembly 23 is covered with the support member 27 on the surface facing the outer shell 25, and the support member 27 is correspondingly provided to avoid the electrode assembly 23 shifting due to the difference in thickness at two places and pulling the electrode tab.

[0116] In some embodiments, please refer to Figure 8 The support component 27 includes at least a protective layer 273 and a heat-conducting layer 274, with the heat-conducting layer 274 located between two adjacent protective layers 273.

[0117] Specifically, the support component 27 has a multi-layer structure. The protective layer 273 can be a film, which can be a film of uniform thickness or a film with localized thickening. The thermally conductive layer 274 is a filler, which can be of uniform thickness or have a thickness difference from the single-layer support component 27 along the first direction X and / or the second direction Y. The thermally conductive layer 274 can include insulating and thermally conductive materials such as alumina, boron nitride, silicon carbide, polytetrafluoroethylene, and aluminum nitride. The thermally conductive layer 274 can also include elastic materials such as rubber, polyurethane, and polyimide.

[0118] In this embodiment, the support component 27 has a multi-layer structure. A heat-conducting layer 274 is introduced in the middle of the protective layer 273. There is no need to customize a locally thickened support component 27. The effect of locally thickening the support component 27 can be achieved by using the middle filling method. This allows the thicker area of ​​the support component 27 to abut against the outer shell 25 first, thus playing the role of clamping the electrode assembly 23.

[0119] In some embodiments, please refer to Figure 8 The support component 27 includes a first part 271 and a second part 272. The first part 271 is correspondingly arranged with the straight section 231, and the second part 272 is correspondingly arranged with the corner section 232. The first part 271 includes a protective layer 273 and a heat-conducting layer 274, with the heat-conducting layer 274 located between two adjacent protective layers 273.

[0120] In this embodiment, the first part 271 has a multi-layer structure. A thermally conductive layer 274 is introduced in the middle of the protective layer 273. This eliminates the need for a custom-designed locally thickened support component 27; the effect of locally thickening the support component 27 can be achieved by filling the middle. This allows the thicker area of ​​the first part 271 to abut against the outer shell 25 first, thus clamping the electrode assembly 23. The process is simple and easier to operate. Furthermore, the straight section 231 where the first part 271 is located is more prone to lithium plating due to wrinkling. By making the first part 271 a multi-layer structure, clamping force can be applied more specifically to the straight section 231, reducing lithium plating problems caused by wrinkling.

[0121] In some embodiments, please refer to Figure 8 Along the first direction X, the thickness of the heat-conducting layer 274 away from the corner section 232 is greater than the thickness of the heat-conducting layer 274 near the corner section 232.

[0122] In this embodiment, the thickness of the thermally conductive layer 274 is greatest in the middle along the first direction X, and decreases as it approaches the corner segment 232. The middle region of the first part 271, which consists of the protective layer 273 and the thermally conductive layer 274, is more likely to abut against the outer shell. The outer shell 25 applies force to the first part 271, thereby creating a clamping effect on the electrode assembly 23 in the thickness direction. Since the expansion space of the straight segment 231 along the first direction X is limited by the adhesive area of ​​the corner segment 232 when it expands, the straight segment 231 is more prone to lithium plating due to wrinkling the further away from the corner segment 232 it is. Therefore, the support component 27, which is composed of the thermally conductive layer 274 and the protective layer 273, can apply targeted force to the more wrinkle-prone areas.

[0123] In some embodiments, along the second direction Y, the thickness of the thermally conductive layer 274 near the middle region of the electrode assembly 23 is greater than the thickness of the thermally conductive layer 274 near the edge region of the electrode assembly 23, and the second direction Y is the winding axis direction of the electrode assembly.

[0124] In this embodiment of the application, along the second direction Y, the thickness of the edge region of the heat-conducting layer 274 is less than the thickness of the middle region. The heat-conducting layer 274 is arc-shaped or at an angle, which can guide it into the shell and to a certain extent prevent the shell from scratching the supporting component.

[0125] In some embodiments, the material of the support member 27 includes an elastic material.

[0126] Elastic materials can change shape when subjected to external forces, including rubber, polyurethane, and polyimide.

[0127] In this embodiment, the support component 27 is made of an elastic material that can absorb and mitigate external impact forces when the battery cell 20 is subjected to vibration and impact, thus providing buffer protection for the electrode assembly 23.

[0128] In some embodiments, the thermal conductivity of the support member 27 is greater than that of the electrode assembly 23.

[0129] The support component 27 can be made of a thermally conductive material, including alumina, boron nitride, silicon carbide, polytetrafluoroethylene, aluminum nitride, etc. Using a thermally conductive material, the support component 27 can rapidly transfer heat from the electrode assembly 23 to the outer casing 25.

[0130] In this embodiment, the support component 27 is made of a thermally conductive material. The support component 27 can optimize the temperature uniformity inside the electrode assembly 23 and accelerate the heat transfer efficiency inside the electrode assembly 23.

[0131] In some embodiments, please refer to Figure 6 The thickness of the support component 27 is D, where 0 < D ≤ 6 mm.

[0132] The thickness of the support component 27 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, or any value between any two adjacent values ​​or any value less than 0-1. When the thickness of the support component 27 is greater than 6mm, the electrode assembly 23, when covering the support component 27, will abut against the outer shell 25 without expansion. This will restrict the expansion of the electrode assembly 23, potentially increasing the internal stress of the electrode assembly 23 and affecting its stability.

[0133] In this embodiment, the thickness of the support component 27 is limited to between 0 and 6 mm, leaving a certain expansion space for the electrode assembly 23.

[0134] In some embodiments, please refer to Figure 6 and Figure 8 The battery cell 20 also includes a protective component 28, which at least partially covers the side of the support component 27 away from the electrode assembly 23, and the hardness of the protective component 28 is greater than that of the support component 27.

[0135] The protective component 28 is a protective layer disposed on the outside of the support component 27. It can be connected to the support component 27 by coating or by wrapping. In some embodiments, the protective component can also be coated on the inner surface of the housing 25. The protective component 28 can be an insulating material to prevent short circuits caused by contact between the electrode assembly 23 and the housing 25. The protective component 28 can also be a rigid material to prevent the electrode assembly 23 from being squeezed, impacted, or punctured and thus failing. The protective component 28 can completely cover the side of the support component 27 facing away from the electrode assembly 23, or it can only cover a portion of the side of the support component 27 facing away from the electrode assembly 23.

[0136] In this embodiment, a protective component 28 is provided outside the support component 27. The protective component 28 can increase the strength of the electrode assembly 23, add a layer of protection to the electrode assembly 23, and reduce the failure of the battery cell 20 due to squeezing, collision or puncture.

[0137] In some embodiments, the protective component 28 is made of insulating material.

[0138] In this embodiment, the protective component 28 is made of insulating material, which can serve as a protective layer to effectively block the conductive path between the outer casing 25 and the electrode assembly 23, and prevent short circuits from occurring.

[0139] In some embodiments, the hardness of the protective component 28 is greater than the hardness of the outer shell 25.

[0140] In this embodiment, the protective component 28 is made of a rigid material, and the hardness of the protective component 28 is greater than that of the outer shell 25. A protective layer can be formed on the outside of the electrode assembly 23 to reduce the occurrence of failure of the electrode assembly 23 due to compression and needle puncture.

[0141] Secondly, embodiments of this application provide a battery device including a battery cell 20 of any of the above embodiments.

[0142] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above embodiments, the battery device being used to provide electrical energy.

[0143] According to some embodiments of this application, this application provides a battery cell 20, including a housing 25, an electrode assembly 23, and a support member 27; the housing 25 has a receiving cavity, the electrode assembly 23 is located in the receiving cavity, the electrode assembly 23 includes a straight section 231 and a corner section 232, the corner section 232 is connected to both ends of the straight section 231 along a first direction X; the support member 27 at least partially covers the outside of the electrode assembly 23; the thickness of the support member 27 in the straight section 231 is at least partially greater than the thickness of the support member 27 in the corner section 232, and the support member 27 protrudes toward the housing 25; the support member 27 continuously covers the electrode assembly 23; the support member 27 includes a first part 271 and a second part 272, the first part 271 is correspondingly disposed with the straight section 231, and the second part 272 is correspondingly disposed with the corner section 232, wherein the first part 271... The thickness of each part 271 is greater than that of the second part 272; along the first direction X, the thickness of the first part 271 away from the corner section 232 is greater than that of the first part 271 near the corner section 232; along the second direction, the thickness of the first part 271 near the middle region of the electrode assembly 23 is greater than that of the first part 271 near the edge region of the electrode assembly 23, and the second direction is the winding axis direction of the electrode assembly 23; along the thickness direction of the electrode assembly 23, the first parts 271 on both sides of the straight section 231 are symmetrically arranged; the support member 27 includes an elastic material, and the thermal conductivity of the support member 27 is greater than that of the electrode assembly 23; the battery cell 20 also includes a protective member 28, which at least partially covers the side of the support member 27 away from the electrode assembly 23, the protective member 28 includes an insulating material, and the hardness of the protective member 28 is greater than that of the outer shell 25.

[0144] According to the battery cell 20 provided in the embodiments of this application, the support member 27 is not easily deformed and has a stronger binding force on the electrode assembly 23. In addition, along the thickness direction of the electrode assembly 23, the straight section 231 of the electrode assembly 23 facing the outer shell is more likely to abut against the outer shell 25 because it covers the support member 27. The outer shell 25 applies a force to the electrode assembly 23, thereby forming a clamping effect. The layers of electrode sheets are more tightly bonded, the friction between the electrode sheets is increased, wrinkling is reduced, thereby reducing lithium plating and improving safety.

[0145] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is located in a receiving cavity, the electrode assembly including a straight section and a corner section, the corner section being connected to both ends of the straight section along a first direction; and A support component, at least partially covering the outside of the electrode assembly; Wherein, the thickness of the support member in the straight section is at least partially greater than the thickness of the support member in the corner section.

2. The battery cell according to claim 1, characterized in that, The support member continuously wraps around the electrode assembly along the winding direction of the electrode assembly.

3. The battery cell according to claim 1, characterized in that, The support component protrudes toward the outer shell.

4. The battery cell according to claim 1, characterized in that, The support component includes a first part and a second part. The first part is disposed corresponding to the straight section, and the second part is disposed corresponding to the corner section. The thickness of the first part is at least partially greater than the maximum thickness of the second part.

5. The battery cell according to claim 4, characterized in that, The thickness of the first part is greater than the maximum thickness of the second part.

6. The battery cell according to claim 4, characterized in that, Along the first direction, the thickness of the first part away from the corner segment is greater than the thickness of the first part near the corner segment.

7. The battery cell according to claim 4, characterized in that, Along the second direction, the thickness of the first part near the middle region of the electrode assembly is greater than the thickness of the first part near the edge region of the electrode assembly, and the second direction is the winding axis of the electrode assembly.

8. The battery cell according to claim 4, characterized in that, The point of maximum thickness of the first part coincides with the center point of the straight section.

9. The battery cell according to claim 4, characterized in that, Along the thickness direction of the electrode assembly, the first portions on both sides of the straight section are symmetrically arranged.

10. The battery cell according to claim 1, characterized in that, The support component includes at least a protective layer and a thermally conductive layer, with the thermally conductive layer located between two adjacent protective layers.

11. The battery cell according to claim 10, characterized in that, The support component includes a first part and a second part. The first part is disposed corresponding to the straight section, and the second part is disposed corresponding to the corner section. The first part includes the protective layer and the heat-conducting layer, and the heat-conducting layer is located between two adjacent protective layers.

12. The battery cell according to claim 11, characterized in that, Along the first direction, the thickness of the heat-conducting layer away from the corner segment is greater than the thickness of the heat-conducting layer near the corner segment.

13. The battery cell according to claim 11, characterized in that, Along the second direction, the thickness of the thermally conductive layer near the middle region of the electrode assembly is greater than the thickness of the thermally conductive layer near the edge region of the electrode assembly, and the second direction is the winding axis of the electrode assembly.

14. The battery cell according to any one of claims 1-13, characterized in that, The material of the support component includes an elastic material.

15. The battery cell according to any one of claims 1-13, characterized in that, The thermal conductivity of the support component is greater than that of the electrode assembly.

16. The battery cell according to any one of claims 1-13, characterized in that, The thickness of the support component is D, where 0 < D ≤ 6 mm.

17. The battery cell according to any one of claims 1-13, characterized in that, The battery cell also includes a protective component that at least partially covers the side of the support component facing away from the electrode assembly, and the protective component has a higher hardness than the support component.

18. The battery cell according to claim 17, characterized in that, The protective component is made of insulating material.

19. The battery cell according to claim 17, characterized in that, The hardness of the protective component is greater than that of the outer shell.

20. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-19.

21. An electrical appliance, characterized in that, Includes the battery device as described in claim 20, wherein the battery device is used to provide electrical energy.

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