Electrode assembly, battery cell, and electric device

Abstract

The application discloses an electrode assembly, a battery monomer and an electric device, and relates to the technical field of batteries. The anode single-sided sheet comprises a first current collector and a first active material layer, and the first active material layer is attached to the first current collector. The cathode sheet is located on the side of the diaphragm away from the anode single-sided sheet. The anode double-sided sheet is located on the side of the cathode sheet away from the anode single-sided sheet, and the anode double-sided sheet comprises a second current collector and a second active material layer. The first active material layer of the anode single-sided sheet comprises a fast-charging graphite layer, and the second active material layer of the anode double-sided sheet comprises a high-compactness graphite layer. In the embodiment of the application, the first active material layer comprises the fast-charging graphite layer, which can increase the migration speed of lithium ions in the anode single-sided sheet, thereby reducing the lithium precipitation in the corresponding anode single-sided sheet. Furthermore, the second active material layer corresponding to the anode double-sided sheet comprises the high-compactness graphite layer, and the high-compactness coating surface density is relatively large, thereby being capable of increasing the energy density of the electrode assembly to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode assembly, a battery cell, and an electrical device. Background Technology

[0002] With the development of new energy sources, more and more fields are adopting new energy as a power source. Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, and energy storage systems. During the manufacturing process of electrode components, to address the issue of electrode curling after rolling, NMP (N-methylpyrrolidone) is coated onto the cathode sheet to reduce the curl. However, NMP also reduces electrode compaction, which to some extent increases the lithium-ion migration rate of the corresponding cathode sheet, leading to lithium plating and a decrease in energy density.

[0003] In related technologies, it is difficult to simultaneously solve the problems of lithium plating and energy density loss in electrode components. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrode assembly, a battery cell, and an electrical device that can simultaneously solve the problems of lithium plating in the electrode assembly and energy density loss.

[0005] The electrode assembly according to a first aspect embodiment of this application includes: The anode single-sided sheet includes a first current collector and a first active material layer arranged along the thickness direction of the electrode assembly, wherein the first active material layer is attached to the first current collector; A diaphragm is attached to the first active material layer; A cathode sheet is attached to the diaphragm, and the cathode sheet is located on the side of the diaphragm opposite to the anode single-sided sheet; The anode double-sided sheet is located on the side of the cathode sheet opposite to the anode single-sided sheet. The anode double-sided sheet includes a second current collector and a second active material layer arranged along the thickness direction of the electrode assembly. At least one of the first active material layers corresponding to the anode single-sided sheet includes a fast-charging graphite layer, and at least one of the second active material layers corresponding to the anode double-sided sheet includes a high-pressure compacted graphite layer.

[0006] The electrode assembly according to the embodiments of this application has at least the following beneficial effects: In the embodiments of this application, the anode single-sided sheet has a first active material layer facing the cathode sheet, and a second active material layer including a fast-charging graphite layer. The fast-charging graphite layer can increase the migration speed of lithium ions in the first anode sheet and also increase the charge and discharge speed of the electrode assembly to a certain extent, thereby reducing lithium plating on the anode single-sided sheet and extending the cycle life of the electrode assembly. Furthermore, the anode double-sided sheet is located on the side of the cathode sheet opposite to the corresponding anode single-sided sheet. The second active material layer corresponding to the anode double-sided sheet includes a high-compact graphite layer. The high-compact coating has a large surface density, thereby increasing the energy density of the electrode assembly to a certain extent. Therefore, the electrode assembly provided by this application can increase the energy density of the electrode assembly while reducing the occurrence of lithium plating problems.

[0007] According to some embodiments of this application, the number of anode single-sided sheets is two. Along the thickness direction of the electrode assembly, the two anode single-sided sheets are located at both ends of the electrode assembly. Each anode single-sided sheet is correspondingly provided with a cathode sheet. The first active material layer corresponding to the two anode single-sided sheets includes a fast-charging graphite layer.

[0008] According to some embodiments of this application, the anode double-sided sheet further includes a third active material layer, which is attached to the second current collector and located on the side of the second current collector opposite to the second active material layer. The third active material layer includes a high-pressure compacted graphite layer.

[0009] According to some embodiments of this application, the number of anode double-sided sheets is multiple, and the second active material layer corresponding to all the anode double-sided sheets includes a high-pressure solid graphite layer.

[0010] According to some embodiments of this application, the coating surface density of the first active material layer is in the range of 50 g / mm². 2 ~120g / mm 2 And / or, along the thickness direction of the electrode assembly, the size of the first active material layer ranges from 25 μm to 30 μm.

[0011] According to some embodiments of this application, the coating surface density of the second active material layer is in the range of 150 g / mm². 2 ~300g / mm 2 And / or, along the thickness direction of the electrode assembly, the size of the second active material layer ranges from 40 μm to 70 μm.

[0012] According to some embodiments of this application, the compaction density of the first active material layer ranges from 1.5 g / cm³. 3 ~1.7 g / cm 3And / or, the compaction density of the second active material layer is in the range of 1.7 g / cm³. 3 ~1.85g / cm 3 .

[0013] According to some embodiments of this application, the electrode assembly is a steel-cased laminated battery cell.

[0014] A second aspect of this application provides a single battery cell, comprising: case; The electrode assembly of any of the above, wherein the electrode assembly is located within the housing.

[0015] A third aspect of this application provides an electrical device, comprising: Main body of the device; The battery cell of any of the above is used to power the main body of the device.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a simplified structural diagram of an electrode assembly in one embodiment of this application.

[0018] Figure label: 100. Single-sided anode sheet; 110. First current collector; 120. First active material layer; 200. Diaphragm; 300. Cathode sheet; 310. Third current collector; 320. Fourth active material layer; 400. Double-sided anode sheet; 410. Second current collector; 420. Second active material layer; 430. Third active material layer. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0025] In related technologies, during the manufacturing process of steel-cased laminated battery cells, the anode single-sided sheet serves as the outermost layer. One side is coated with active material, and the other side is an empty foil. The empty foil side faces the steel casing or cover plate, while the active material side faces the separator and cathode sheet. A single-sided anode can only receive or extract lithium ions on one side, resulting in a more uneven current density distribution compared to a double-sided anode. Under the same overall current, the current density of the outermost single-sided anode is much greater than that of the inner double-sided anode. This means that a single-sided anode requires a faster anion migration rate per unit area compared to a double-sided anode, placing higher demands on its kinetics and making it more prone to lithium deposition. Furthermore, to improve the problem of electrode warpage after rolling, lower rolling density or thicker copper foil is often used for sample preparation, resulting in significant energy density loss. Related technologies struggle to simultaneously address both the lithium deposition problem and the energy density loss issue in electrode components.

[0026] The anode single-sided sheet 100 of this application embodiment has a first active material layer 120 facing the cathode sheet 300. The first active material layer 120 includes a fast-charging graphite layer. The cathode sheet 300 has an anode double-sided sheet 400 on the side opposite to the anode single-sided sheet 100. The second active material layer 420 corresponding to the anode double-sided sheet 400 includes a high-pressure compacted graphite layer. The fast-charging graphite layer can increase the migration speed of lithium ions in the anode single-sided sheet 100 to reduce the occurrence of lithium plating. The high-pressure compacted graphite layer can increase the energy density of the electrode assembly.

[0027] This application provides an electrical device, which includes a device body and a battery cell, the battery cell being used to supply power to the device body.

[0028] Electrical devices can be, for example, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft.

[0029] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use battery devices.

[0030] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0031] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0032] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0033] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0034] This application also provides a battery pack, which includes a housing and at least one battery cell, with the battery cell located inside the housing.

[0035] In some embodiments of this 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.

[0036] 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.

[0037] This application provides an electrode assembly; please refer to [link / reference]. Figure 1 The electrode assembly includes an anode single-sided sheet 100, a diaphragm 200, a cathode sheet 300, and an anode double-sided sheet 400. The anode single-sided sheet 100 includes a first current collector 110 and a first active material layer 120 arranged along the thickness direction of the electrode assembly, with the first active material layer 120 attached to the first current collector 110. Exemplarily, the thickness directions of the anode single-sided sheet 100, diaphragm 200, cathode sheet 300, and anode double-sided sheet 400 are all arranged parallel to the thickness direction of the electrode assembly, as shown in the figure. Figure 1 The direction indicated by the middle arrow R1. The diaphragm 200 is attached to the first active material layer 120, and the diaphragm 200 is made of insulating material. The cathode sheet 300 is attached to the diaphragm 200, and the cathode sheet 300 is located on the side of the diaphragm 200 opposite to the anode single-sided sheet 100. It can be understood that all cathode sheets 300 are double-sided sheets, and each cathode sheet 300 includes a third current collector 310 and a third active material layer 430. Along the thickness direction of the electrode assembly, the third active material layer 430 is attached to both opposite sides of the third current collector 310. A diaphragm 200 is disposed between the cathode sheet 300 and both the single-sided and double-sided cathode sheets. The anode double-sided sheet 400 is located on the side of the cathode sheet 300 opposite to the anode single-sided sheet 100. The anode double-sided sheet 400 includes a second current collector 410 and a second active material layer 420 arranged along the thickness direction of the electrode assembly. At least one of the first active material layers 120 corresponding to the anode single-sided sheet 100 includes a fast-charging graphite layer, and at least one of the second active material layers 420 corresponding to the anode double-sided sheet 400 includes a high-compact graphite layer. Exemplarily, the first current collector 110 and the second current collector 410 are metal foils or composite current collectors. In some embodiments, the metal foil is a copper foil. The composite current collector may include a metal foil substrate and a conductive layer disposed on at least one side of the metal foil substrate. In some embodiments, the conductive layer may include at least one of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanosheets, carbon fibers, carbon nanofibers, graphitized carbon sheets, carbon nanotubes, carbon nanotubes, activated carbon, and mesoporous carbon. The third current collector 310 is a metal foil or a composite current collector. In some embodiments, the metal foil is an aluminum foil. The composite current collector may include a metal foil substrate and a conductive layer disposed on at least one side of the metal foil substrate.

[0038] In the embodiments of this application, the anode single-sided sheet 100 has a first active material layer 120 facing the cathode sheet 300, and a second active material layer 420 including a fast-charging graphite layer. The fast-charging graphite layer can increase the migration speed of lithium ions in the first anode sheet and can also increase the charge and discharge speed of the electrode assembly to a certain extent, thereby reducing lithium plating on the anode single-sided sheet 100 and extending the cycle life of the electrode assembly. Furthermore, the anode double-sided sheet 400 is located on the side of the cathode sheet 300 opposite to the corresponding anode single-sided sheet 100. The second active material layer 420 corresponding to the anode double-sided sheet 400 includes a high-compact graphite layer. The high-compact coating has a large surface density, thereby increasing the energy density of the electrode assembly to a certain extent. Therefore, the electrode assembly provided by this application can increase the energy density of the electrode assembly while reducing the occurrence of lithium plating problems.

[0039] In one embodiment, there are two anode single-sided sheets 100. Along the thickness direction of the electrode assembly, the two anode single-sided sheets 100 are located at both ends of the electrode assembly. Each anode single-sided sheet 100 is correspondingly provided with a cathode sheet 300. The first active material layer 120 corresponding to both anode single-sided sheets 100 includes a fast-charging graphite layer. Anode single-sided sheets 100 are correspondingly provided on both end faces along the thickness direction of the electrode assembly. The first active material layer 120 corresponding to both anode single-sided sheets 100 includes a fast-charging graphite layer, and the fast-charging graphite layers are disposed opposite to the corresponding cathode sheets 300, thereby minimizing lithium plating in the electrode assembly. It is understood that there can be multiple anode double-sided sheets 400, all of which are located between two anode single-sided sheets 100.

[0040] In one embodiment, the anode double-sided sheet 400 further includes a third active material layer 430, which is attached to the second current collector 410. The third active material layer 430 is located on the side of the second current collector 410 opposite to the second active material layer 420, and includes a compacted graphite layer. Exemplarily, along the thickness direction of the electrode assembly, the second current collector 410 is located between the third active material layer 430 and the second active material layer 420. The inclusion of compacted graphite layers on both sides of the active material layer of the anode double-sided sheet 400 can further increase the energy density of the electrode assembly, resulting in a larger battery capacity.

[0041] It is understood that other embodiments of this application are not limited to the third active material layer 430 comprising a high-pressure compacted graphite layer. Exemplarily, the third active material layer 430 comprises a fast-charging graphite layer.

[0042] In one embodiment, there are multiple anode double-sided sheets 400, and the second active material layer 420 corresponding to all anode double-sided sheets 400 includes a high-density graphite layer. Exemplarily, all anode double-sided sheets 400 are located between two anode single-sided sheets 100, and each anode double-sided sheet 400 has a corresponding cathode sheet 300 on both sides along the thickness direction of the electrode assembly. A diaphragm 200 is disposed between each anode double-sided sheet 400 and the cathode sheet 300. The electrode assembly contains as many high-density graphite layers as possible, thereby further increasing the energy density of the electrode assembly.

[0043] In one embodiment, the coating surface density of the first active material layer 120 is in the range of 50 g / mm². 2 ~120g / mm 2 For example, the coating surface density of the first active material layer 120 is 50 g / mm². 2 70 g / mm 2 90 g / mm 2 110 g / mm 2 Or 120 g / mm 2 The value may be either [value] or within the range of any two of the aforementioned values. It is understood that the surface density of the active material layer can be calculated by measuring the coating area and the mass of the coating material, or by calculating the attenuation level when β-rays are absorbed as they penetrate the coating layer. The surface density of the first active material layer 120 will affect its thickness to a certain extent. Within a suitable range, the surface density of the first active material layer 120 can improve the CB value of the electrode assembly while reducing the impact of the first active material layer 120 on the energy density.

[0044] In one embodiment, the size of the first active material layer 120 along the thickness direction of the electrode assembly ranges from 25 μm to 30 μm. Exemplarily, the size of the first active material layer 120 along the thickness direction of the electrode assembly is 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, or 30 μm, or falls within any two of these values. A suitable thickness range for the first active material layer 120 allows for a high lithium-ion migration rate in the anode single-sided sheet 100 while also reducing the impact of the first active material layer 120 on energy density.

[0045] In one embodiment, the coating surface density of the second active material layer 420 is in the range of 150 g / mm². 2 ~300g / mm 2 For example, the coating surface density of the second active material layer 420 is 150 g / mm². 2 170 g / mm2 190 g / mm 2 210 g / mm 2 230 g / mm 2 250 g / mm 2 270 g / mm 2 Or 300 g / mm 2 Or it can be within the range of any two of the above values. A suitable coating density for the second active material layer 420 can improve the energy density of the electrode assembly while also controlling the processing difficulty and manufacturing cost of the electrode assembly.

[0046] It is understandable that the coating density W of the first active material layer 120 is... a The coating density W of the second active material layer 420 b Different values ​​will have different effects on the cycle life and energy density of the electrode assembly. For details, please refer to Tables 1 and 2 of this manual.

[0047]

[0048] Table 2:

[0049] The experimental data in Table 1 show that, while keeping the coating density of the second active material layer 420 constant, increasing the coating density of the first active material layer 120 can reduce lithium plating in the electrode assembly, thereby improving the cycle life of the electrode assembly. Furthermore, a coating density exceeding 85 g / mm² is beneficial. 2 In this case, the coating density of the first active material layer 120 has no effect on the increase in cycle life.

[0050] The experimental data in Table 2 show that, with the coating density of the first active material layer 120 remaining constant, increasing the coating density of the second active material layer 420 can increase the energy density of the electrode assembly. Furthermore, the coating density of the second active material layer 420 exceeds 190 g / mm². 2 In some cases, the energy density of the electrode assembly actually decreases to a certain extent.

[0051] In one embodiment, the size of the second active material layer 420 along the thickness direction of the electrode assembly ranges from 40 μm to 70 μm. Exemplarily, the size of the second active material layer 420 along the thickness direction of the electrode assembly is 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, or 70 μm, or falls within any two of these values. The thickness of the second active material layer 420 can affect the energy density of the electrode assembly to a certain extent, but the increase is limited. After the thickness of the second active material layer 420 exceeds a certain value, it becomes difficult for the second active material layer 420 to further increase the energy density of the electrode assembly. Maintaining the thickness of the second active material layer 420 within a suitable range can improve the energy density of the electrode assembly while also controlling the processing difficulty and manufacturing cost of the electrode assembly.

[0052] In one embodiment, the compaction density of the first active material layer 120 ranges from 1.5 g / cm³. 3 ~1.7 g / cm 3 For example, the compaction density of the first active material layer 120 is 1.5 g / cm³. 3 1.55 g / cm 3 1.60 g / cm 3 1.65 g / cm 3 Or 1.70 g / cm 3 The compaction process of the first active material layer 120 is achieved by a pressure roller. The compaction density of the first active material layer 120 is within a suitable range so that the first active material layer 120 can be well compacted to reduce the shedding of active material.

[0053] In one embodiment, the compaction density of the second active material layer 420 ranges from 1.7 g / cm³. 3 ~1.85g / cm 3 For example, the compaction density of the second active material layer 420 is 1.70 g / cm³. 3 1.75 g / cm 3 1.80 g / cm 3 Or 1.85 g / cm 3 The compaction density of the second active material layer 420 is within a suitable range so that the second active material layer 420 can be well compacted to reduce the shedding of active material.

[0054] In one embodiment, the electrode assembly is a steel-cased laminated battery cell. Exemplarily, the battery cell further includes an electrode lead-out assembly. A first through-hole is provided on the wall of the casing. The electrode lead-out assembly includes an electrode terminal, a connecting piece, and at least one sealing member. The connecting piece is a metal sheet connected to the wall. A second through-hole is provided on the connecting piece, through which the electrode terminal passes. The sealing member is disposed between the connecting piece and the electrode terminal.

[0055] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 all should be covered within the scope of the 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 protection.

Claims

1. An electrode assembly, characterized by, include: The anode single-sided sheet includes a first current collector and a first active material layer arranged along the thickness direction of the electrode assembly, wherein the first active material layer is attached to the first current collector; A diaphragm is attached to the first active material layer; A cathode sheet is attached to the diaphragm, and the cathode sheet is located on the side of the diaphragm opposite to the anode single-sided sheet; The anode double-sided sheet is located on the side of the cathode sheet opposite to the anode single-sided sheet. The anode double-sided sheet includes a second current collector and a second active material layer arranged along the thickness direction of the electrode assembly. At least one of the first active material layers corresponding to the anode single-sided sheet includes a fast-charging graphite layer, and at least one of the second active material layers corresponding to the anode double-sided sheet includes a high-pressure compacted graphite layer.

2. The electrode assembly of claim 1, wherein, The number of anode single-sided sheets is two. Along the thickness direction of the electrode assembly, the two anode single-sided sheets are located at both ends of the electrode assembly. Each anode single-sided sheet is correspondingly provided with a cathode sheet. The first active material layer corresponding to the two anode single-sided sheets includes a fast-charging graphite layer.

3. The electrode assembly of claim 1, wherein, The anode double-sided sheet further includes a third active material layer, which is attached to the second current collector and located on the side of the second current collector opposite to the second active material layer. The third active material layer includes a high-pressure compacted graphite layer.

4. The electrode assembly of claim 3, wherein, The number of anode double-sided sheets is multiple, and the second active material layer corresponding to all anode double-sided sheets includes a high-pressure solid graphite layer.

5. The electrode assembly of claim 1, wherein, The coating surface density of the first active material layer ranges from 50 g / mm 2 120 g / mm 2 And / or, the size of the first active material layer in the thickness direction of the electrode assembly ranges from 25 μm to 30 μm.

6. The electrode assembly of claim 5, wherein, The surface density of the second active material layer is in the range of 150 g / mm². 2 ~300g / mm 2 And / or, along the thickness direction of the electrode assembly, the size of the second active material layer ranges from 40 μm to 70 μm.

7. The electrode assembly according to claim 1, characterized in that, The compacted density of the first active material layer is in the range of 1.5 g / cm 3 ~1.7 g / cm 3 The compacted density of the second active material layer is in the range of 1.7 g / cm 3 ~1.85 g / cm 3 .

8. The electrode assembly of claim 1, wherein, The electrode assembly is a steel-cased laminated battery cell.

9. A battery cell, characterized by include: case; At least one electrode assembly as described in any one of claims 1 to 8, the electrode assembly being located within the housing.

10. An electrical device, characterized by include: Main body of the device; The battery cell as described in claim 9 is used to power the main body of the device.

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