Electrode assembly, battery cell, battery apparatus, electrical apparatus, and manufacturing method

Abstract

The present application provides an electrode assembly, a battery cell, a battery apparatus, an electrical apparatus, and a manufacturing method. The electrode assembly comprises a first electrode sheet, a second electrode sheet, a first solid-state electrolyte layer, and a first insulating layer. The first electrode sheet comprises a first main body portion and a first tab. The first electrode sheet and the second electrode sheet have opposite polarities. The second electrode sheet comprises a second main body portion. The area of the second main body portion is greater than the area of the first main body portion. The second main body portion comprises an edge extension portion extending beyond the first main body portion. The first solid-state electrolyte layer is disposed between the first main body portion and the second main body portion. The first insulating layer is disposed corresponding to the edge extension portion. The first insulating layer is disposed surrounding the first main body portion. The first insulating layer enclosingly forms an accommodating space. A part of the first main body portion is located in the accommodating space. The first insulating layer comprises a tab lead-out channel. The tab lead-out channel is in communication with the accommodating space. The first tab is led out from the tab lead-out channel.

Description

Electrode assemblies, battery cells, battery devices, electrical devices and manufacturing methods

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411812963.1, filed on December 10, 2024, entitled “Electrode Assembly, Battery Cell, Battery Device, Electrical Device and Manufacturing Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to an electrode assembly, a battery cell, a battery device, an electrical device, and a manufacturing method. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Improving battery safety has always been a key research direction in battery technology development. Summary of the Invention

[0005] In view of the above problems, this application provides an electrode assembly, a battery cell, a battery device, an electrical device, and a manufacturing method, which is beneficial to improving the safety of the battery device.

[0006] This application provides an electrode assembly including a first electrode, a second electrode, a first solid electrolyte layer, and a first insulating layer. The first electrode includes a first body portion and a first tab. The first electrode and the second electrode have opposite polarities. The second electrode includes a second body portion. The area of ​​the second body portion is larger than the area of ​​the first body portion. The second body portion includes an edge extension extending beyond the first body portion. The first solid electrolyte layer is disposed between the first body portion and the second body portion. The first insulating layer is disposed corresponding to the edge extension. The first insulating layer surrounds the first body portion. The first insulating layer encloses and forms a receiving space. A portion of the first body portion is located within the receiving space. The first insulating layer includes a tab lead-out channel. The tab lead-out channel communicates with the receiving space. The first tab extends out from the tab lead-out channel.

[0007] In the electrode assembly of this application embodiment, the area of ​​the second main body is larger than the area of ​​the first main body. A first insulating layer is correspondingly provided on the edge extension portion of the second main body. The first insulating layer can protect and support the edge extension portion of the second main body, reducing the possibility that the edge extension portion will be crushed or deformed during the pressing process and come into contact with the first main body, resulting in a short circuit between the first and second main bodies. The first insulating layer can restrict and constrain the first main body, reducing the possibility that the first main body will be misaligned relative to the second main body during the formation process, causing the first main body to bend or wrinkle, which would lead to uneven lithium deposition. A tab lead-out channel is provided on the first insulating layer. The tab lead-out channel corresponds to the position of the first tab. After the first tab is folded up, the tab lead-out channel can be used to avoid the first tab, making it difficult for the first insulating layer to raise the first tab in the thickness direction of the electrode assembly. This reduces the possibility that the first insulating layer will apply compressive stress to the folded first tab, causing uneven stress on the first electrode sheet and resulting in local cracking, which is beneficial to improving the safety of the electrode assembly.

[0008] In some feasible ways, the width of the electrode lead-out channel is greater than or equal to the width of the first electrode.

[0009] When stacking the first electrode, a portion of the first electrode tab can relatively easily enter the electrode tab lead-out channel, reducing the difficulty of positioning and matching the first electrode tab with the electrode tab lead-out channel.

[0010] In some feasible ways, the tab lead-out channel extends through the first insulating layer along the thickness direction of the electrode assembly.

[0011] The tab lead-out channel can serve as the lead-out space for the first tab. Along the thickness direction of the electrode assembly, the tab lead-out channel provides a large lead-out space for the first tab. The first tab passes through the tab lead-out channel. A portion of the first tab is located within the tab lead-out channel. The first tab does not need to cross the first insulating layer, making it difficult for the first insulating layer to elevate the first tab in the thickness direction of the electrode assembly. The first tab can reuse the space of the tab lead-out channel, reducing the space occupancy of the first tab in the thickness direction of the electrode assembly.

[0012] In some feasible implementations, the first electrode includes an isolator disposed on the first tab, the isolator extending through a lead-out channel of the tab and beyond the first insulating layer.

[0013] The isolator provides protection for the first electrode tab. When the first electrode tab is retracted, both the first electrode tab and the isolator can deform simultaneously, such as by bending. After the first electrode tab is retracted, the isolator can separate the first electrode tab from the second body portion, reducing the possibility of a short circuit between the first electrode tab and the second electrode plate caused by contact between the first electrode tab and the second body portion.

[0014] In some possible implementations, the first tab includes a first connecting segment and a second connecting segment connected together, the first connecting segment being connected to a first main body portion, the first connecting segment passing through a tab lead-out channel and extending beyond a first insulating layer, and the first connecting segment being provided with an isolator.

[0015] The isolator provides protection for the first connecting segment. When the first tab is retracted, the first connecting segment and the isolator can deform simultaneously, for example, by bending. After the first tab is retracted, the isolator can separate the first connecting segment from the second main body, reducing the possibility of a short circuit between the first tab and the second electrode due to contact between the first connecting segment and the second main body.

[0016] In some feasible embodiments, the first main body includes a first current collector and a first active material layer, the first current collector is provided with the first active material layer, the first connecting section is connected to the first current collector, and the thickness of the isolation member is less than or equal to the thickness of the first active material layer.

[0017] The isolator provides protection for the first connecting segment. When the first tab is retracted, the first connecting segment and the isolator can deform simultaneously, for example, by bending. After the first tab is retracted, the isolator can separate the first connecting segment from the second main body, reducing the possibility of a short circuit between the first tab and the second electrode due to contact between the first connecting segment and the second main body.

[0018] In some possible implementations, the first main body includes a first current collector, a first connecting section is connected to the first current collector, the first electrode includes a first active material layer, the first active material layer is disposed on both the first current collector and the first connecting section, the first solid electrolyte layer is located in the accommodating space, the first solid electrolyte layer is disposed on the first main body, and both the separator and the first solid electrolyte layer are disposed on the first active material layer.

[0019] The first active material layer provided on the first connecting section can play a thickness compensation role, which is beneficial to reduce the height difference between the first solid electrolyte layer and the separator in the thickness direction of the electrode assembly.

[0020] In some feasible ways, the thickness of the separator is less than or equal to the thickness of the first solid electrolyte layer.

[0021] If the thickness of the spacer is greater than the thickness of the first solid electrolyte layer, the spacer extends beyond the first solid electrolyte layer along the thickness direction of the electrode assembly. The portion of the spacer located at the tab lead-out channel will form a raised section, potentially causing a lack of contact between the edge of the first solid electrolyte layer near the spacer and adjacent layer structures, affecting the electrical performance between the first solid electrolyte layer and adjacent layer structures. Having a spacer thickness less than or equal to the thickness of the first solid electrolyte layer can help reduce the likelihood of the aforementioned technical problems.

[0022] In some feasible ways, the insulating element includes at least one of a ceramic structure, an insulating adhesive, an insulating tape, and a solid electrolyte structure.

[0023] In some feasible embodiments, the material of the first insulating layer includes at least one of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber.

[0024] In some feasible embodiments, the electrode assembly further includes a second insulating layer, the second body portion includes a receiving portion extending along the edge of the second body portion, the second insulating layer is disposed within the receiving portion, the first insulating layer and the second insulating layer are stacked, the first solid electrolyte layer is located within the receiving space, and the edge of the first solid electrolyte layer overlaps with the second insulating layer.

[0025] A first insulating layer may be disposed around the first solid electrolyte layer and the first main body portion. The first insulating layer provides protection and isolation for the first solid electrolyte layer and the first main body portion, reducing the possibility of cracking or detachment of the edge of the first solid electrolyte layer during the pressing process. A second insulating layer isolates the first solid electrolyte layer and the second main body portion, reducing the possibility of a short circuit between the first and second main body portions caused by cracking or detachment of the edge of the first solid electrolyte layer during the pressing process. The first and second insulating layers work synergistically to provide isolation and protection, further reducing the possibility of a short circuit between the first and second main body portions.

[0026] In some feasible embodiments, the second insulating layer includes a first portion and a second portion, the first insulating layer being stacked with the first portion, the outer surface of the first insulating layer being flush with the outer surface of the first portion, the second portion extending beyond the first insulating layer, and the edge of the first solid electrolyte layer overlapping the second portion.

[0027] The first insulating layer and a first portion of the second insulating layer can together form an isolation and protection between the first body portion and the second body portion. In the event of damage to the first insulating layer, the first portion of the second insulating layer can still separate the first body portion and the second body portion, thereby reducing the possibility of contact and short circuit between the first body portion and the second body portion and improving the safety of the electrode assembly.

[0028] In some feasible embodiments, a first solid electrolyte layer is disposed on a first body portion.

[0029] After the first solid electrolyte layer is placed on the first electrode, the overall structure formed by the first electrode and the first solid electrolyte layer is stacked with the second electrode. This helps to reduce the possibility that the first solid electrolyte layer will be misaligned during the stacking process, which would affect the electrical performance.

[0030] In some feasible embodiments, the second main body includes a second current collector and a second active material layer, the second active material layer is provided with a receiving portion, a second insulating layer is disposed within the receiving portion, and the second active material layer is in contact with the first solid electrolyte layer.

[0031] Material is removed from the edges of the second active material layer to form a receiving portion. The second insulating layer can provide circumferential protection for the second active material layer, thereby reducing the likelihood of the edges of the second active material layer falling off during the pressing process, and decreasing the possibility of a short circuit occurring due to the active material falling off, which could cause the first and second main body portions to connect through the active material.

[0032] In some feasible ways, the accommodator does not penetrate the second active material layer along the thickness direction of the electrode assembly.

[0033] The fact that the second current collector is not exposed helps to reduce the possibility of a violent reaction caused by direct contact between the first electrode and the second current collector.

[0034] In some feasible ways, the containment extends through the second active material layer along the thickness direction of the electrode assembly.

[0035] The second insulating layer surrounds the second active material layer. The second active material layer can be entirely located inside the second insulating layer. The second insulating layer provides protection for the second active material layer throughout its circumference, which helps reduce the possibility of cracking or detachment of the second active material layer during the pressing process.

[0036] In some feasible implementations, the receiving part is a ring structure, and the second insulating layer is a closed ring structure.

[0037] The second insulating layer can be used to prevent the first electrode tab from directly contacting the second main body after it is folded up, thereby reducing the possibility of a short circuit between the first electrode and the second electrode due to contact between the first electrode tab and the second main body.

[0038] In some feasible ways, the surface of the second insulating layer facing the first electrode is flush with the surface of the second body portion facing the first electrode.

[0039] Both the second insulating layer and the second main body can contact the first solid electrolyte layer. During the pressing process, the area of ​​the first solid electrolyte layer corresponding to the second insulating layer experiences relatively consistent stress with the area of ​​the first solid electrolyte layer corresponding to the second main body, resulting in uniform stress on the first solid electrolyte layer as a whole and reducing the possibility of cracking or detachment of the first solid electrolyte layer at the edges.

[0040] In some feasible implementations, the width of the edge extension is equal to the width of the first insulating layer, and the width of the second insulating layer is greater than the width of the edge extension.

[0041] The first insulating layer covers the entire outer edge extension, providing good support, isolation, and protection for the entire outer edge extension. A portion of the second insulating layer extends below the first main body, thus providing good isolation and protection between the first and second main bodies.

[0042] In some feasible implementations, the thickness of the first insulating layer protruding from the second insulating layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, wherein H0 = H1 / 2 + H2.

[0043] Along the thickness direction of the electrode assembly, second electrodes can be respectively disposed on both sides of the first electrode. A first insulating layer is disposed on each second electrode. In the stacked structure of the first electrode, the first solid electrolyte layer, and the second electrode, adjacent first insulating layers can contact each other. The two first insulating layers can fill the space between the two edge extension portions, thereby providing effective support for the edge extension portions and reducing the possibility of crushing or deformation of the edge extension portions. The two first insulating layers can surround and enclose the first solid electrolyte layer and the first main body, which helps to improve the protective and isolation effects of the first insulating layers on the first solid electrolyte layer and the first main body.

[0044] In some feasible implementations, there is one first electrode, two second electrodes, a first electrode is disposed between the two second electrodes, and a first insulating layer and a second insulating layer are disposed on one side of the second main body.

[0045] In some feasible methods, there are multiple first electrodes and multiple second electrodes, with the first and second electrodes arranged alternately. Two second electrodes are located on the outermost side, and a first insulating layer and a second insulating layer are provided on one side of the second main body on the two outermost second electrodes. On the second electrodes located between adjacent first electrodes, a first insulating layer and a second insulating layer are provided on both sides of the second main body, respectively. Alternatively, two first electrodes are located on the outermost side, and a first insulating layer and a second insulating layer are provided on both sides of the second main body, respectively.

[0046] In some feasible embodiments, the material of the second insulating layer includes at least one of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber.

[0047] In some feasible embodiments, a first solid electrolyte layer is disposed on a second body portion, the first solid electrolyte layer covers the outer edge extension portion, a first insulating layer is disposed on the first solid electrolyte layer, and the first body portion is in contact with the first solid electrolyte layer.

[0048] The first insulating layer may be disposed around the first main body. The first insulating layer has a protective and isolation effect on the first main body, so that during the pressing process, the edges of the first main body are less likely to crack or fall off, reducing the possibility of short circuit between the first and second main bodies due to the detached material.

[0049] In some feasible implementations, the thickness of the first insulating layer protruding from the first solid electrolyte layer is H0, and the thickness of the first main body is H1, where H0 = H1 / 2.

[0050] Along the thickness direction of the electrode assembly, a second electrode and a first solid electrolyte layer can be respectively disposed on both sides of the first electrode. A first insulating layer is disposed on each first solid electrolyte layer. After the first electrode, second electrode, first solid electrolyte layer and first insulating layer are stacked, two adjacent first insulating layers can contact each other, so that the two first insulating layers surround and enclose the first main body, which helps to improve the protective and isolation effect of the first insulating layer on the first main body.

[0051] In some feasible implementations, there is one first electrode, two second electrodes, a first electrode is disposed between the two second electrodes, and a first insulating layer and a first solid electrolyte layer are disposed on one side of the second main body.

[0052] In some feasible methods, there are multiple first electrodes and multiple second electrodes, with the first and second electrodes arranged alternately. Two second electrodes are located on the outermost side. On the two outermost second electrodes, a first insulating layer and a first solid electrolyte layer are provided on one side of the second main body. On the second electrodes located between adjacent first electrodes, a first insulating layer and a first solid electrolyte layer are provided on both sides of the second main body. Alternatively, two first electrodes are located on the outermost side, and a first insulating layer and a first solid electrolyte layer are provided on both sides of the second main body.

[0053] In some feasible embodiments, the electrode assembly further includes a second solid electrolyte layer disposed on the second body portion, the second solid electrolyte layer covering the outer edge extension portion, a first insulating layer disposed on the second solid electrolyte layer, the first solid electrolyte layer located within the receiving space, and the first solid electrolyte layer located between the second solid electrolyte layer and the first body portion.

[0054] The method of simultaneously setting a first solid electrolyte layer and a second solid electrolyte layer between the first electrode and the second electrode is beneficial to improving the electrical performance between the first electrode and the second electrode.

[0055] In some feasible implementations, the thickness of the first insulating layer protruding from the second solid electrolyte layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, wherein H0 = H1 / 2 + H2.

[0056] Along the thickness direction of the electrode assembly, a second electrode and a second solid electrolyte layer can be respectively disposed on both sides of the first electrode. A first insulating layer is disposed on each second solid electrolyte layer. After the first electrode, the first solid electrolyte layer, the second electrode, the second solid electrolyte layer and the first insulating layer are stacked, two adjacent first insulating layers can contact each other, so that the two first insulating layers surround the first solid electrolyte layer and the first main body, which helps to improve the protective and isolation effect of the first insulating layer on the first solid electrolyte layer and the first main body.

[0057] In some feasible implementations, there is one first electrode, two second electrodes, a first electrode is disposed between the two second electrodes, and a second solid electrolyte layer and a first insulating layer are disposed on one side of the second main body.

[0058] In some feasible methods, there are multiple first electrodes and multiple second electrodes, with the first and second electrodes arranged alternately. Two second electrodes are located on the outermost side. On the two outermost second electrodes, a second solid electrolyte layer and a first insulating layer are disposed on one side of the second main body. On the second electrodes located between adjacent first electrodes, a second solid electrolyte layer and a first insulating layer are disposed on both sides of the second main body. Alternatively, two first electrodes are located on the outermost side, and a second solid electrolyte layer and a first insulating layer are disposed on both sides of the second main body.

[0059] In some feasible implementations, the width of the first insulating layer is equal to the width of the edge extension.

[0060] In the pressing process, an encapsulation film is used to encapsulate the overall structure of the stacked electrode and solid electrolyte layer before pressing. The method of ensuring the first insulating layer does not extend beyond the edge helps reduce the possibility of mutual compression between the first insulating layer and the encapsulation film.

[0061] In some possible implementations, the second electrode includes a second tab connected to the second body portion, with the first tab and the second tab located on the same side of the first body portion; or, the first tab and the second tab are located on opposite sides of the first body portion.

[0062] In some feasible ways, the first electrode and the second electrode are respectively a positive electrode and a negative electrode.

[0063] This application provides a battery cell that includes the electrode assembly described above.

[0064] This application provides a battery device comprising a battery cell as described above.

[0065] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy.

[0066] This application provides a method for manufacturing an electrode assembly, which includes:

[0067] A first electrode plate is provided, comprising a first main body and a first electrode tab;

[0068] A second electrode is provided, wherein the first electrode has the opposite polarity to the second electrode, and the second electrode includes a second main body portion, the area of ​​which is larger than the area of ​​the first main body portion;

[0069] A first solid electrolyte layer is provided. In the stacked first electrode, the first solid electrolyte layer and the second electrode, the first solid electrolyte layer is disposed between the first main body portion and the second main body portion. The second main body portion includes an edge extension portion that extends beyond the first main body portion.

[0070] A first insulating layer is provided, which is disposed on the outer edge of the corresponding part. The first insulating layer surrounds the first main body and forms a receiving space. A portion of the first main body is located in the receiving space. The first insulating layer includes a tab lead-out channel, which is connected to the receiving space. The first tab is led out from the tab lead-out channel. Attached Figure Description

[0071] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0072] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0073] Figure 2 is a partially exploded structural diagram of a battery device provided in an embodiment of this application;

[0074] Figure 3 is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0075] Figure 4 is a partial exploded view of a battery cell provided in an embodiment of this application;

[0076] Figure 5 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0077] Figure 6 is an enlarged schematic diagram of point M in Figure 5;

[0078] Figure 7 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0079] Figure 8 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0080] Figure 9 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0081] Figure 10 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0082] Figure 11 is a partial cross-sectional view of the first tab of an electrode assembly provided in an embodiment of this application during its retraction process;

[0083] Figure 12 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0084] Figure 13 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0085] Figure 14 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0086] Figure 15 is a partially exploded structural diagram of the second electrode provided in an embodiment of this application;

[0087] Figure 16 is a schematic diagram of the structure of an electrode assembly provided in an embodiment of this application;

[0088] Figure 17 is a partial cross-sectional view of an electrode assembly provided in one embodiment of this application;

[0089] Figure 18 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0090] Figure 19 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0091] Figure 20 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0092] Figure 21 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0093] Figure 22 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0094] Figure 23 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0095] Figure 24 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0096] Figure 25 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0097] Figure 26 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0098] Figure 27 is a partial cross-sectional view of the first tab of an electrode assembly provided in an embodiment of this application during its retraction process.

[0099] Figure 28 is a partially exploded structural diagram of the first electrode provided in an embodiment of this application;

[0100] Figure 29 is a schematic diagram of the structure of an electrode assembly provided in an embodiment of this application;

[0101] Figure 30 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0102] Figure 31 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0103] Figure 32 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0104] Figure 33 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0105] Figure 34 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0106] Figure 35 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0107] Figure 36 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0108] Figure 37 is a partial cross-sectional view of the first tab of an electrode assembly provided in an embodiment of this application during its retraction process.

[0109] Figure 38 is a partially exploded structural diagram of the second electrode provided in an embodiment of this application;

[0110] Figure 39 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0111] Figure 40 is a schematic diagram of the structure of an electrode assembly provided in an embodiment of this application;

[0112] Figure 41 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0113] Figure 42 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0114] Figure 43 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0115] Figure 44 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application;

[0116] Figure 45 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application;

[0117] Figure 46 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application.

[0118] Explanation of reference numerals in the attached drawings: 1. Vehicle; 10. Battery assembly; 10a. Housing; 10b. First housing section; 10c. Second housing section; 11. Controller; 12. Motor; 20. Battery module; 30. Battery cell; 40. End cap; 41. Electrode terminal; 50. Housing; 60. Electrode assembly; 70. First electrode; 701. First active material layer; 71. First main body section; 711. First current collector; 72. First tab; 721. First connecting section; 722. Second connecting section; 73. Separator; 80. Second electrode; 81. Second main body section; 8101. Edge extension; 8102. Receiving section; 811. Second current collector; 812. Second active material layer; 82. Second tab; 90. First solid electrolyte layer; 100, First insulating layer; 101, tab lead-out channel; 102, receiving space; 110, Second insulating layer; 111, First part; 112, Second part; 120, Second solid electrolyte layer; X, length direction; Y, width direction; Z, thickness direction. Detailed Implementation

[0119] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0120] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0121] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0122] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0123] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0124] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0125] 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 military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0126] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0127] 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. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery modules, etc. A battery device 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.

[0128] A single battery cell includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0129] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes the positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0130] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is 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 is coated with the negative active material layer. The material of the negative current collector can be copper. The negative active material layer includes the negative active material. The negative active material can be carbon or silicon, etc.

[0131] An electrode assembly is the component in a battery cell where electrochemical reactions occur. The electrode assembly includes a positive electrode, a negative electrode, and an interlayer dielectric layer. An interlayer dielectric layer is disposed between the positive and negative electrode. The interlayer dielectric layer may include a solid electrolyte layer. When the electrode assembly formed by stacking the positive electrode, solid electrolyte layer, and negative electrode is applied to a battery cell, the battery cell is a solid-state battery, thus eliminating the need for liquid electrolyte filling within the battery cell. Exemplarily, the solid electrolyte layer may be a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or a polymer-based solid electrolyte.

[0132] During the manufacturing process of the electrode assembly, the positive electrode, solid electrolyte layer, and negative electrode are stacked and pressed to ensure tight contact between each layer of the positive electrode, solid electrolyte layer, and negative electrode.

[0133] For example, the positive and negative electrode plates each have a main body portion. The portions of the positive and negative electrode plates extending from the main body portion constitute tabs. The positive and negative tabs may be located together at one end of the main body portion or separately at both ends of the main body portion. During the charging and discharging process of the battery, the positive and negative active materials undergo an electrochemical reaction with the solid electrolyte layer, and the tabs connect to the electrode terminals to form a current loop.

[0134] In related technologies, for solid-state batteries, a pressing process is required to press the stacked solid-state electrolyte layer and electrodes to improve the contact between them. During pressing, compressive stress is applied to both sides of the stacked solid-state electrolyte layer and electrodes along the thickness direction. However, the two electrodes with opposite polarities have different areas. During pressing, the edges of the larger electrode may not be separated, leading to edge crushing and deformation, potentially causing short circuits due to contact between the electrodes. To address this issue, one approach is to... However, the electrode tabs need to be folded towards one side of the electrode assembly and connected to the electrode terminals. After the electrode tabs are folded, the insulating layer may come into contact with the tabs and apply pressure, causing uneven stress on the electrodes and resulting in cracking, affecting the safety of the electrode assembly.

[0135] To mitigate the problem of short circuits in the electrode sheets, an insulating layer is placed on larger electrode sheets to provide support for their edges, reducing the likelihood of edge crushing, deformation, and subsequent short circuits. A tab lead-out channel is incorporated into the insulating layer so that the tabs do not contact the insulating layer when the electrode sheets are closed.

[0136] Based on the above considerations, to alleviate the problem of short circuits in the electrode sheets, the inventors, after in-depth research, designed an electrode assembly. In this assembly, an insulating layer is placed on the larger electrode sheet to provide support for its edges, reducing the possibility of edge crushing, deformation, and short circuits. The area of ​​the insulating layer corresponding to the tab is designated as a tab lead-out channel. After the tab is closed, the tab lead-out channel avoids the tab, preventing contact between the tab and the insulating layer. This prevents the insulating layer from applying compressive stress to the tab, reducing the possibility of cracking due to uneven stress on the electrode sheet and improving the safety of the electrode assembly.

[0137] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0138] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. 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. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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. This application does not impose any special limitations on the above-mentioned electrical devices.

[0139] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0140] Referring to Figure 1, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0141] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0142] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery module or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes a battery module or battery pack. Multiple battery cells can be connected in series, parallel, or a combination thereof. A combination thereof refers to a mix of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into a battery module, and then the battery modules can be assembled into a battery pack.

[0143] Referring to Figure 2, the battery device 10 includes a housing 10a and individual battery cells (not shown). The individual battery cells are housed within the housing 10a.

[0144] The housing 10a can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10a can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0145] The housing 10a is used to accommodate individual battery cells, and the housing 10a can have various structures. In some embodiments, the housing 10a may include a first housing portion 10b and a second housing portion 10c. The first housing portion 10b and the second housing portion 10c overlap each other. The first housing portion 10b and the second housing portion 10c together define a receiving space for accommodating the individual battery cells. The second housing portion 10c may be a hollow structure with one open end. In some embodiments, the first housing portion 10b is a plate-like structure. The first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. In some embodiments, both the first housing portion 10b and the second housing portion 10c may also be hollow structures with one open side. The open side of the first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. Of course, the first housing portion 10b and the second housing portion 10c can have various shapes, such as cylinders, cuboids, etc.

[0146] To improve the sealing performance after the first housing part 10b and the second housing part 10c are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 10b and the second housing part 10c.

[0147] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b may also be referred to as the upper housing cover, and the second housing portion 10c may also be referred to as the lower housing.

[0148] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 10a. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module. Multiple battery modules can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10a.

[0149] In some embodiments, as shown in FIG3, there may be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed manner to form a battery module 20. Multiple battery modules 20 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the housing 10a.

[0150] Multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery module 20.

[0151] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

[0152] The battery cell 30 refers to the smallest unit that makes up the battery device 10. As shown in Figure 4, the battery cell 30 includes an end cap 40, a housing 50, and an electrode assembly 60.

[0153] End cap 40 refers to a component that covers the opening of housing 50 to isolate the internal environment of battery cell 30 from the external environment. Exemplarily, the shape of end cap 40 can be adapted to the shape of housing 50 to fit the housing 50. Exemplarily, end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under pressure or impact, enabling battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on end cap 40. Electrode terminals 41 can be used for electrical connection with the tabs of electrode assembly 60 for outputting or inputting electrical energy into battery cell 30.

[0154] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap 40 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component can be used to isolate the electrical connection components within the housing 50 from the end cap 40 to reduce the risk of short circuits. Exemplarily, the insulating component can be plastic, rubber, etc.

[0155] The housing 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. The formed internal environment can accommodate the electrode assembly 60 and other components. The housing 50 and the end cap 40 can be independent components. An opening can be provided on the housing 50, and the end cap 40 closes the opening to form the internal environment of the battery cell 30. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 50, the end cap 40 closes the housing 50. The housing 50 can have various shapes and sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0156] Referring to Figures 5 to 10, an embodiment of this application provides an electrode assembly 60, which includes a first electrode 70, a second electrode 80, a first solid electrolyte layer 90, and a first insulating layer 100.

[0157] The first electrode 70 includes a first main body portion 71 and a first tab 72. The first electrode 70 has the opposite polarity to the second electrode 80. The second electrode 80 includes a second main body portion 81. The area of ​​the second main body portion 81 is larger than the area of ​​the first main body portion 71. The second main body portion 81 includes an edge extension portion 8101 extending beyond the first main body portion 71. A first solid electrolyte layer 90 is disposed between the first main body portion 71 and the second main body portion 81. A first insulating layer 100 is disposed corresponding to the edge extension portion 8101. The first insulating layer 100 surrounds the first main body portion 71. The first insulating layer 100 encloses and forms a receiving space 102. A portion of the first main body portion 71 is located within the receiving space 102. The first insulating layer 100 includes a tab lead-out channel 101. The tab lead-out channel 101 communicates with the receiving space 102. The first tab 72 is led out from the tab lead-out channel 101.

[0158] In this embodiment, the correspondence between the first insulating layer 100 and the edge extension portion 8101 refers to the fact that the position of the first insulating layer 100 corresponds to the position of the edge extension portion 8101 along the thickness direction Z of the electrode assembly 60. After the first electrode 70 and the second electrode 80 are stacked, the portion of the second main body 81 that extends beyond the first main body 71 forms the edge extension portion 8101. The first insulating layer 100 can be used to provide support for the edge extension portion 8101.

[0159] The areas of the first main body portion 71 and the second main body portion 81 are different. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first main body portion 71 lies within the orthographic projection of the second main body portion 81. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the first main body portion 71, the first solid electrolyte layer 90, and the second main body portion 81. A stepped structure is formed between the first main body portion 71 and the second main body portion 81. The second main body portion 81 has an edge extension 8101 extending beyond the first main body portion 71, and the root region of the first tab 72 extends across the edge extension 8101.

[0160] When the first tab 72 is retracted, the root region of the first tab 72 will deform, for example, bend. After the first tab 72 is retracted, the tab lead-out channel 101 of the first insulating layer 100 can avoid the first tab 72.

[0161] In the electrode assembly 60 of this application embodiment, the area of ​​the second main body portion 81 is larger than the area of ​​the first main body portion 71. A first insulating layer 100 is correspondingly disposed on the edge extension portion 8101 of the second main body portion 81. The first insulating layer 100 can provide protection and support for the edge extension portion 8101 of the second main body portion 81, reducing the possibility that the edge extension portion 8101 may be crushed or deformed during the pressing process, and come into contact with the first main body portion 71, leading to a short circuit between the first main body portion 71 and the second main body portion 81. The first insulating layer 100 can also restrict and constrain the first main body portion 71, reducing the possibility that the first main body portion 71 may be misaligned relative to the second main body portion 81 during the formation process, causing the first main body portion 71 to bend or wrinkle, thereby resulting in uneven lithium deposition. A tab lead-out channel 101 is disposed on the first insulating layer 100. The tab lead-out channel 101 corresponds to the position of the first tab 72. After the first tab 72 is folded up, the tab lead-out channel 101 can be used to avoid the first tab 72, so that the first insulating layer 100 is less likely to raise the first tab 72 in the thickness direction Z of the electrode assembly 60. This reduces the possibility that the first insulating layer 100 will apply compressive stress to the folded first tab 72, resulting in uneven stress on the first electrode 70 and local cracking, which is beneficial to improving the safety of the electrode assembly 60.

[0162] In some feasible implementations, the width of the tab lead-out channel 101 is greater than or equal to the width of the first tab 72. The tab lead-out channel 101 of the first insulating layer 100 can avoid the first tab 72. For example, when the first electrode 70 is stacked, a portion of the first tab 72 can relatively easily enter the tab lead-out channel 101, reducing the difficulty of positioning and matching the first tab 72 with the tab lead-out channel 101.

[0163] In some feasible implementations, the tab lead-out channel 101 extends through the first insulating layer 100 along the thickness direction Z of the electrode assembly 60. The first insulating layer 100 may be a non-closed annular structure. The first insulating layer 100 may be discontinuous at the tab lead-out channel 101.

[0164] The tab lead-out channel 101 can serve as the lead-out space for the first tab 72. Along the thickness direction Z of the electrode assembly 60, the tab lead-out channel 101 can provide a large lead-out space for the first tab 72. The first tab 72 passes through the tab lead-out channel 101. A portion of the first tab 72 is located within the tab lead-out channel 101. The first tab 72 does not need to cross the first insulating layer 100, making it less likely that the first insulating layer 100 will raise the first tab 72 in the thickness direction Z of the electrode assembly 60. The first tab 72 can reuse the space of the tab lead-out channel 101, reducing the space occupancy rate of the first tab 72 in the thickness direction Z of the electrode assembly 60.

[0165] In some possible implementations, as shown in Figures 8, 9, and 11, the first electrode 70 includes an isolator 73. The isolator 73 is disposed on the first tab 72. The isolator 73 extends through the tab lead-out channel 101 and beyond the first insulating layer 100. A portion of the isolator 73 is located within the tab lead-out channel 101.

[0166] The isolator 73 can protect the first electrode tab 72. When the first electrode tab 72 is retracted, the first electrode tab 72 and the isolator 73 can deform simultaneously, for example, by bending. After the first electrode tab 72 is retracted, the isolator 73 can isolate the first electrode tab 72 and the second main body 81, reducing the possibility of a short circuit between the first electrode tab 72 and the second electrode plate 80 due to contact between the first electrode tab 72 and the second main body 81.

[0167] In some examples, referring to Figure 11, the first tab 72 includes a first connecting segment 721 and a second connecting segment 722 connected together. The first connecting segment 721 is connected to the first body portion 71. The first connecting segment 721 extends through the tab lead-out channel 101 and beyond the first insulating layer 100. The first connecting segment 721 is provided with an isolator 73. The isolator 73 extends through the tab lead-out channel 101 and beyond the first insulating layer 100. The second connecting segment 722 is located on the side of the first connecting segment 721 away from the first body portion 71. The second connecting segment 722 is used for connection to the electrode terminal 41. For example, the second connecting segment 722 is used for soldering to the electrode terminal 41.

[0168] The isolator 73 can protect the first connecting segment 721. After the first tab 72 is retracted, the first connecting segment 721 and the isolator 73 can deform simultaneously, for example, by bending. After the first tab 72 is retracted, the isolator 73 can isolate the first connecting segment 721 and the second main body 81, reducing the possibility of a short circuit between the first tab 72 and the second electrode plate 80 caused by contact between the first connecting segment 721 and the second main body 81.

[0169] In some examples, a portion of the first connecting segment 721 is located within the tab lead-out channel 101. Isolators 73 may be provided on both sides of the first connecting segment 721 along the thickness direction Z of the electrode assembly 60.

[0170] In some examples, referring to Figures 12 and 13, both the first main body portion 71 and the second main body portion 81 are rectangular. The length of the first main body portion 71 is C2. The first tab 72 extends along the length direction X. The length of the second main body portion 81 is C1. In the length direction X, the width of the edge extension portion 8101 can be equal to (C1 - C2) / 2. In the length direction X, the length of the first tab 72 is W1. In the length direction X, the dimension W of the spacer 73 is greater than (C1 - C2) / 2 and less than W1, so that the spacer 73 extends beyond the first insulating layer 100.

[0171] The width of the first main body portion 71 is L2, and the width of the second main body portion 81 is L1, wherein L1 is greater than L2. In the width direction Y, the width of the edge extension portion 8101 can be equal to (L1 - L2) / 2. In the width direction Y, the width of the first electrode tab 72 can be equal to the width of the spacer 73. In the width direction Y, the dimension of the spacer 73 is B.

[0172] In some possible implementations, referring to Figures 11 and 14, the first main body 71 includes a first current collector 711. A first connecting segment 721 is connected to the first current collector 711. The first electrode 70 includes a first active material layer 701. The first active material layer 701 is disposed on both the first current collector 711 and the first connecting segment 721. A first solid electrolyte layer 90 is located within the receiving space 102. The first solid electrolyte layer 90 is disposed on the first main body 71. The separator 73 and the first solid electrolyte layer 90 are both disposed on the first active material layer 701. The area of ​​the first solid electrolyte layer 90 may be equal to the area of ​​the first main body 71.

[0173] The first active material layer 701 provided on the first connecting section 721 can play a thickness compensation role, which is beneficial to reduce the height difference between the first solid electrolyte layer 90 and the separator 73 in the thickness direction Z of the electrode assembly 60.

[0174] In some examples, a coating process is used to coat a solid electrolyte material onto the first active material layer 701 to form a first solid electrolyte layer 90. The coating process allows for precise control of the amount of solid electrolyte material coated, which helps to improve the thickness consistency and surface smoothness of the formed first solid electrolyte layer 90.

[0175] In some examples, along the thickness direction Z of the electrode assembly 60, a first active material layer 701 is provided on both sides of the first current collector 711, and a first active material layer 701 is provided on both sides of the first connecting section 721.

[0176] In some examples, the thickness of the spacer 73 is less than or equal to the thickness of the first solid electrolyte layer 90. The thickness of the spacer 73 is equal to the thickness of the first solid electrolyte layer 90, and the spacer 73 and the first solid electrolyte layer 90 may be flush. The thickness of the spacer 73 is less than the thickness of the first solid electrolyte layer 90, and there is a height difference between the spacer 73 and the first solid electrolyte layer 90.

[0177] If the thickness of the spacer 73 is greater than the thickness of the first solid electrolyte layer 90, the spacer 73 extends beyond the first solid electrolyte layer 90 along the thickness direction Z of the electrode assembly 60. The portion of the spacer 73 located at the tab lead-out channel 101 will form a raised section, potentially causing a lack of contact between the edge of the first solid electrolyte layer 90 near the spacer 73 and the adjacent layer structure, affecting the electrical performance between the first solid electrolyte layer 90 and the adjacent layer structure. Having the thickness of the spacer 73 less than or equal to the thickness of the first solid electrolyte layer 90 can help reduce the likelihood of the aforementioned technical problem.

[0178] In some feasible ways, the insulating element 73 may include, but is not limited to, at least one of a ceramic structure, an insulating adhesive, an insulating tape, and a solid electrolyte structure.

[0179] In some examples, the materials of the ceramic structure include, but are not limited to, alumina. Exemplarily, a ceramic material is coated onto the first tab 72 or the first active material layer 701 using a coating process to form a spacer 73.

[0180] The insulating adhesive may be made of at least one of the following materials: polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polymethyl methacrylate, polyethylene terephthalate, and rubber. The insulating adhesive may be bonded to the first tab 72 or the first active material layer 701.

[0181] The insulating tape is made of at least one of the following materials: polyethylene, polypropylene, polytetrafluoroethylene, and polyimide. The insulating tape can be adhered to the first tab 72 or the first active material layer 701.

[0182] The materials of the solid electrolyte structure and the first solid electrolyte layer 90 can be the same, so that the same materials can be used to form the separator 73 and the first solid electrolyte layer 90. When the separator 73 and the second body 81 come into contact at the tab lead-out channel 101, a short circuit will not occur between the separator 73 and the second body 81.

[0183] In some examples, a coating process is used to coat a solid electrolyte material onto a first active material layer 701 to form a separator 73.

[0184] In some examples, the separator 73 includes a solid electrolyte structure. The separator 73 and the first solid electrolyte layer 90 are integrally formed. In the same processing step, the first solid electrolyte layer 90 and the separator 73 can be formed simultaneously using the same solid electrolyte material, which helps to reduce processing steps and lower the processing difficulty of the separator 73. In some examples, a coating process is used to coat the solid electrolyte material onto the first active material layer 701 to form the first solid electrolyte layer 90 and the separator 73.

[0185] In some possible implementations, referring to Figures 10 and 15, the electrode assembly 60 further includes a second insulating layer 110. The second body portion 81 includes a receiving portion 8102. The receiving portion 8102 extends along the edge of the second body portion 81. The second insulating layer 110 is disposed within the receiving portion 8102. Along the thickness direction Z of the electrode assembly 60, the first insulating layer 100 and the second insulating layer 110 are stacked. A first solid electrolyte layer 90 is located within the receiving space 102. The edge of the first solid electrolyte layer 90 overlaps with the second insulating layer 110. The first solid electrolyte layer 90 is in contact with the second body portion 81.

[0186] The receiving portion 8102 of the second main body portion 81 refers to the space formed after removing part of the material from the edge of the second main body portion 81. The thickness of the second main body portion 81 in the receiving portion 8102 region is less than the thickness of the region where the receiving portion 8102 is not provided. The second insulating layer 110 may be provided in the receiving portion 8102 to reduce the height difference between the second insulating layer 110 and the second main body portion 81.

[0187] A first insulating layer 100 may be disposed around the first solid electrolyte layer 90 and the first main body portion 71. The first insulating layer 100 provides protection and isolation for the first solid electrolyte layer 90 and the first main body portion 71, reducing the possibility of cracking or detachment of the edge of the first solid electrolyte layer 90 during the pressing process. A second insulating layer 110 is used to isolate the first solid electrolyte layer 90 and the second main body portion 81, reducing the possibility of a short circuit between the first main body portion 71 and the second main body portion 81 due to cracking or detachment of the edge of the first solid electrolyte layer 90 during the pressing process. The first insulating layer 100 and the second insulating layer 110 work together to provide isolation and protection, reducing the possibility of a short circuit between the first main body portion 71 and the second main body portion 81.

[0188] In some examples, the material of the first insulating layer 100 may include, but is not limited to, one or more of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber. The material of the second insulating layer 110 may include, but is not limited to, one or more of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber.

[0189] In some examples, referring to Figure 10, the width of the first insulating layer 100 is smaller than the width of the second insulating layer 110. The first insulating layer 100 does not extend beyond the second insulating layer 110. The second insulating layer 110 includes a first portion 111 and a second portion 112. The first portion 111 is located outside the second portion 112. The first insulating layer 100 is stacked with the first portion 111. Exemplarily, the outer surface of the first insulating layer 100 is flush with the outer surface of the first portion 111. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first insulating layer 100 may coincide with the orthographic projection of the first portion 111. The second portion 112 extends beyond the first insulating layer 100. The second portion 112 can be observed through the receiving space 102 of the first insulating layer 100. The edge of the first solid electrolyte layer 90 overlaps with the second portion 112.

[0190] The first insulating layer 100 and the first portion 111 of the second insulating layer 110 can together form an isolation and protection between the first main body portion 71 and the second main body portion 81. In the event of damage to the first insulating layer 100, the first portion 111 of the second insulating layer 110 can still separate the first main body portion 71 and the second main body portion 81, thereby reducing the possibility of contact and short circuit between the first main body portion 71 and the second main body portion 81 and improving the safety of the electrode assembly 60.

[0191] Even if the edge of the first solid electrolyte layer 90 is cracked or detached, the second part 112 of the second insulating layer 110 can still separate the first main body 71 and the second main body 81, thereby reducing the possibility of contact and short circuit between the first main body 71 and the second main body 81 and improving the safety of the electrode assembly 60.

[0192] In some examples, the first solid electrolyte layer 90 is disposed on the first main body portion 71. After the first solid electrolyte layer 90 is disposed on the first electrode 70, the overall structure formed by the first electrode 70 and the first solid electrolyte layer 90 is stacked with the second electrode 80, which helps to reduce the possibility of the first solid electrolyte layer 90 being misaligned during the stacking process and affecting the electrical performance.

[0193] In some examples, referring to Figures 10 and 15, the second body portion 81 includes a second current collector and a second active material layer 812. The second active material layer 812 has a receiving portion 8102. A second insulating layer 110 is disposed within the receiving portion 8102. The second active material layer 812 is in contact with the first solid electrolyte layer 90.

[0194] Material is removed from the edges of the second active material layer 812 to form a receiving portion 8102. The second insulating layer 110 can form a protective layer for the second active material layer 812 in the circumferential direction, so that the edges of the second active material layer 812 are less likely to fall off during the pressing process, reducing the possibility that the first main body portion 71 and the second main body portion 81 will be connected through the active material and short-circuit due to the active material falling off.

[0195] In some examples, the receiving portion 8102 does not penetrate the second active material layer 812 along the thickness direction Z of the electrode assembly 60. The second active material layer 812 has active material at the location of the receiving portion 8102, so that the second current collector 811 is not exposed, which helps to reduce the possibility of a violent reaction caused by direct contact between the first electrode tab 72 and the second current collector 811.

[0196] In some examples, the receiving portion 8102 can penetrate the second active material layer 812 along the thickness direction Z of the electrode assembly 60. No active material remains in the second active material layer 812 at the location of the receiving portion 8102, allowing the second current collector 811 to be exposed at the location of the receiving portion 8102. A second insulating layer 110 is disposed around the second active material layer 812. The second active material layer 812 can be entirely located inside the second insulating layer 110. The second insulating layer 110 provides protection for the second active material layer 812 throughout its circumference, which helps reduce the possibility of cracking or detachment of the second active material layer 812 during the pressing process.

[0197] In some examples, the receiving portion 8102 has a ring-shaped structure. The second insulating layer 110 has a closed ring-shaped structure. The first insulating layer 100 can be a non-closed ring-shaped structure. The first insulating layer 100 can be discontinuous at the tab lead-out channel 101. The second insulating layer 110 is exposed at the tab lead-out channel 101. The second insulating layer 110 can be used to prevent the first tab 72 from directly contacting the second main body portion 81 after it is retracted, thereby reducing the possibility of a short circuit between the first electrode 70 and the second electrode 80 caused by contact between the first tab 72 and the second main body portion 81.

[0198] In some examples, the surface of the second insulating layer 110 facing the first electrode 70 is flush with the surface of the second body portion 81 facing the first electrode 70. Along the thickness direction Z of the electrode assembly 60, the second insulating layer 110 does not extend beyond the second body portion 81.

[0199] Both the second insulating layer 110 and the second main body 81 can contact the first solid electrolyte layer 90. During the pressing process, the area of ​​the first solid electrolyte layer 90 corresponding to the second insulating layer 110 is subjected to relatively consistent stress with the area of ​​the first solid electrolyte layer 90 corresponding to the second main body 81, so that the first solid electrolyte layer 90 is subjected to uniform stress as a whole, reducing the possibility of the first solid electrolyte layer 90 cracking or falling off at the edges.

[0200] If there is a significant height difference between the second insulating layer 110 and the second main body 81, the second insulating layer 110 will create a raised area at the edge of the first solid electrolyte layer 90. During the pressing process, the edge of the first solid electrolyte layer 90 experiences greater stress, resulting in uneven stress distribution across the entire first solid electrolyte layer 90. This can lead to the possibility of cracking or detachment of the first solid electrolyte layer 90 at its edge. In this embodiment, the second insulating layer 110 is flush with the second main body 81 along the thickness direction Z of the electrode assembly 60, which helps to solve the above-mentioned technical problems.

[0201] In some examples, the accommodating portion 8102 does not penetrate the second active material layer 812 along the thickness direction Z of the electrode assembly 60. The thickness of the second insulating layer 110 is less than the thickness of the second active material layer 812.

[0202] In some examples, the receiving portion 8102 penetrates the second active material layer 812 along the thickness direction Z of the electrode assembly 60. The thickness of the second insulating layer 110 may be equal to the thickness of the second active material layer 812.

[0203] In some possible implementations, the width of the edge extension 8101 is equal to the width of the first insulating layer 100. The first insulating layer 100 does not extend beyond the outer surface of the edge extension 8101. The width of the second insulating layer 110 is greater than the width of the edge extension 8101. The second insulating layer 110 does not extend beyond the outer surface of the edge extension 8101.

[0204] The first insulating layer 100 covers the entire edge extension portion 8101, and the first insulating layer 100 can provide good support, isolation and protection for the entire edge extension portion 8101. A portion of the second insulating layer 110 extends below the first main body portion 71, thereby providing good isolation and protection between the first main body portion 71 and the second main body portion 81.

[0205] In some examples, referring to Figures 11 and 12, both the first main body 71 and the second main body 81 are rectangular. The length of the first main body 71 is C2, and the length of the second main body 81 is C1, where C1 is greater than C2. The width of the first main body 71 is L2, and the width of the second main body 81 is L1, where L1 is greater than L2. Exemplarily, the width of the first insulating layer 100 can be L0. Wherein, in the length direction X, L0 = (C1 - C2) / 2, and in the width direction Y, L0 = (L1 - L2) / 2. In the length direction X, the length of the first tab 72 is W1. In the length direction X, the dimension W of the spacer 73 is greater than (C1 - C2) / 2 and less than W1. The dimension W of the spacer 73 is greater than the width L0 of the first insulating layer 100.

[0206] In some possible implementations, referring to Figures 16 and 17, the first insulating layer 100 protrudes from the second insulating layer 110 by a thickness of H0. The thickness of the first main body portion 71 is H1. The thickness of the first solid electrolyte layer 90 is H2. Wherein, H0 = H1 / 2 + H2.

[0207] Along the thickness direction Z of the electrode assembly 60, second electrodes 80 can be respectively disposed on both sides of the first electrode 70. A first insulating layer 100 is disposed on each second electrode 80. In the stacked structure of the first electrode 70, the first solid electrolyte layer 90, and the second electrode 80, adjacent first insulating layers 100 can contact each other. The two first insulating layers 100 can fill the space between the two edge extension portions 8101, thereby providing effective support for the edge extension portions 8101 and reducing the possibility of crushing or deformation of the edge extension portions 8101. The two first insulating layers 100 can surround and enclose the first solid electrolyte layer 90 and the first main body portion 71, which helps to improve the protective and isolation effects of the first insulating layers 100 on the first solid electrolyte layer 90 and the first main body portion 71.

[0208] In some possible implementations, as shown in Figures 16 and 17, there is one first electrode 70 and two second electrodes 80. A first electrode 70 is positioned between the two second electrodes 80. A first insulating layer 100 and a second insulating layer 110 are provided on one side of the second main body 81.

[0209] In some feasible implementations, as shown in Figure 18, there are multiple first electrode plates 70 and multiple second electrode plates 80. The first electrode plates 70 and second electrode plates 80 are alternately arranged. Two second electrode plates 80 are located on the outermost sides. On the two outermost second electrode plates 80, a first insulating layer 100 and a second insulating layer 110 are provided on one side of the second main body portion 81. On the second electrode plates 80 located between adjacent first electrode plates 70, a first insulating layer 100 and a second insulating layer 110 are respectively provided on both sides of the second main body portion 81.

[0210] In some feasible implementations, as shown in Figure 19, there are multiple first electrode plates 70 and multiple second electrode plates 80. The first electrode plates 70 and the second electrode plates 80 are alternately arranged. The two first electrode plates 70 are located on the outermost side, and a first insulating layer 100 and a second insulating layer 110 are respectively provided on both sides of the second main body 81.

[0211] In some possible implementations, referring to FIG20, the first tab 72 and the second tab 82 may be located on the same side of the first body portion 71. The first tab 72 and the second tab 82 extend from the same side. The first tab 72 and the second tab 82 are spaced apart. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first tab 72 does not overlap with the orthographic projection of the second tab 82. In some examples, along the width direction Y, the distance between the first tab 72 and one edge of the first body portion 71 is less than the distance between the first tab 72 and the other edge of the first body portion 71.

[0212] In some possible implementations, referring to Figure 21, the first tab 72 and the second tab 82 are located on opposite sides of the first body portion 71. The first tab 72 and the second tab 82 extend from opposite sides, respectively. In some examples, along the width direction Y, the distance between the first tab 72 and one edge of the first body portion 71 is equal to the distance between the first tab 72 and the other edge of the first body portion 71.

[0213] In some feasible ways, the first electrode 70 and the second electrode 80 are respectively a positive electrode and a negative electrode.

[0214] In some examples, the first electrode 70 can be a positive electrode. The materials of the first tab 72 and the first current collector 711 can be aluminum. The first active material layer 701 can include a positive electrode active material. The positive electrode active material can include lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0215] The second electrode 80 can be a negative electrode. The materials of the second electrode tab 82 and the second current collector 811 can be copper. The second active material layer 812 includes a negative electrode active material. The negative electrode active material can include carbon or silicon, etc.

[0216] In some examples, the first electrode 70 can be a negative electrode, and the second electrode 80 can be a positive electrode.

[0217] In some possible implementations, as shown in Figures 22 to 25, a first solid electrolyte layer 90 is disposed on a second body portion 81. The first solid electrolyte layer 90 covers the outer edge extension portion 8101. A first insulating layer 100 is disposed on the first solid electrolyte layer 90. The first insulating layer 100 protrudes from the first solid electrolyte layer 90. The first body portion 71 is in contact with the first solid electrolyte layer 90.

[0218] The first insulating layer 100 may be disposed around the first main body portion 71. The first insulating layer 100 has a protective and isolation effect on the first main body portion 71, so that during the pressing process, the edge of the first main body portion 71 is less likely to crack or fall off, reducing the possibility that the first main body portion 71 and the second main body portion 81 may be connected by the fallen material and short-circuit due to the material falling off the first main body portion 71.

[0219] After the first tab 72 is folded up, the tab lead-out channel 101 can be used to avoid the first tab 72, so that the first insulating layer 100 is less likely to raise the first tab 72 in the thickness direction Z of the electrode assembly 60. This reduces the possibility that the first insulating layer 100 will apply compressive stress to the folded first tab 72, resulting in uneven stress on the first electrode 70 and local cracking, which is beneficial to improving the safety of the electrode assembly 60.

[0220] In some examples, the area of ​​the first solid electrolyte layer 90 is equal to the area of ​​the second body portion 81.

[0221] In some possible implementations, referring to Figures 26, 27, and 28, the first electrode 70 includes a first active material layer 701. The first main body 71 includes a first current collector 711 and the first active material layer 701. The first current collector 711 is provided with the first active material layer 701. A first connecting section 721 is connected to the first current collector 711. The first electrode tab 72 does not have the first active material layer 701 provided on it. A spacer 73 is directly disposed on the first connecting section 721. The thickness of the spacer 73 is less than or equal to the thickness of the first active material layer 701.

[0222] The thickness of the separator 73 is equal to the thickness of the first active material layer 701, and the separator 73 and the first active material layer 701 can be flush. The thickness of the separator 73 is less than the thickness of the first active material layer 701, and there is a height difference between the separator 73 and the first active material layer 701.

[0223] If the thickness of the spacer 73 is greater than the thickness of the first active material layer 701, the spacer 73 extends beyond the first active material layer 701 along the thickness direction Z of the electrode assembly 60. The portion of the spacer 73 located at the tab lead-out channel 101 will form a raised section, potentially causing a lack of contact between the edge of the first active material layer 701 near the spacer 73 and the adjacent layer structure, affecting the electrical performance between the first active material layer 701 and the adjacent layer structure. Having the thickness of the spacer 73 less than or equal to the thickness of the first active material layer 701 can help reduce the likelihood of the aforementioned technical problems occurring.

[0224] The isolator 73 can protect the first connecting segment 721. After the first tab 72 is retracted, the first connecting segment 721 and the isolator 73 can deform simultaneously, for example, by bending. After the first tab 72 is retracted, the isolator 73 can isolate the first connecting segment 721 and the second main body 81, reducing the possibility of a short circuit between the first tab 72 and the second electrode plate 80 caused by contact between the first connecting segment 721 and the second main body 81.

[0225] In some examples, as shown in Figures 29 and 30, the first insulating layer 100 protrudes from the first solid electrolyte layer 90 by a thickness of H0, and the first main body portion 71 has a thickness of H1, where H0 = H1 / 2.

[0226] Along the thickness direction Z of the electrode assembly 60, a second electrode 80 and a first solid electrolyte layer 90 can be respectively disposed on both sides of the first electrode 70. A first insulating layer 100 is disposed on each first solid electrolyte layer 90. After the first electrode 70, the second electrode 80, the first solid electrolyte layer 90 and the first insulating layer 100 are stacked, two adjacent first insulating layers 100 can contact each other, so that the two first insulating layers 100 surround the first main body 71, which helps to improve the protective and isolation effect of the first insulating layer 100 on the first main body 71.

[0227] In some examples, the surface of the first solid electrolyte layer 90 facing the first electrode 70 is flat, resulting in a uniform overall thickness and good surface flatness. A first insulating layer 100 is disposed on the first solid electrolyte layer 90. The thickness of the first insulating layer 100 is the thickness H0 protruding from the first solid electrolyte layer 90.

[0228] In some possible implementations, as shown in Figures 29 and 30, there is one first electrode 70 and two second electrodes 80. A first electrode 70 is positioned between the two second electrodes 80. A first insulating layer 100 and a first solid electrolyte layer 90 are disposed on one side of the second main body 81.

[0229] In some feasible implementations, as shown in Figure 31, there are multiple first electrode plates 70 and multiple second electrode plates 80. The first electrode plates 70 and second electrode plates 80 are alternately arranged. Two second electrode plates 80 are located on the outermost sides. On the two outermost second electrode plates 80, a first insulating layer 100 and a first solid electrolyte layer 90 are provided on one side of the second main body portion 81. On the second electrode plates 80 located between adjacent first electrode plates 70, a first insulating layer 100 and a first solid electrolyte layer 90 are respectively provided on both sides of the second main body portion 81.

[0230] In some possible implementations, as shown in Figure 32, there are multiple first electrodes 70 and multiple second electrodes 80. The first electrodes 70 and second electrodes 80 are alternately arranged. The two first electrodes 70 are located on the outermost sides. A first insulating layer 100 and a first solid electrolyte layer 90 are respectively provided on both sides of the second main body 81.

[0231] In some feasible embodiments, as shown in Figures 33 to 36, the electrode assembly 60 further includes a second solid electrolyte layer 120. The second solid electrolyte layer 120 is disposed on the second main body portion 81. The second solid electrolyte layer 120 covers the outer edge extension portion 8101. A first insulating layer 100 is disposed on the second solid electrolyte layer 120. A first solid electrolyte layer 90 is located within the receiving space 102. The first solid electrolyte layer 90 is located between the second solid electrolyte layer 120 and the first main body portion 71. The first solid electrolyte layer 90 is disposed on the first main body portion 71. The first solid electrolyte layer 90 is in contact with the second solid electrolyte layer 120. The simultaneous placement of the first solid electrolyte layer 90 and the second solid electrolyte layer 120 between the first electrode 70 and the second electrode 80 is beneficial for improving the electrical performance between the first electrode 70 and the second electrode 80.

[0232] In this embodiment, after the first electrode 70, the first solid electrolyte layer 90, the second electrode 80, and the second solid electrolyte layer 120 are stacked and pressed, the first main body 71 is in contact with the first solid electrolyte layer 90, the first solid electrolyte layer 90 is in contact with the second solid electrolyte layer 120, and the second main body 81 is in contact with the second solid electrolyte layer 120. A first insulating layer 100 is located on the side of the second solid electrolyte layer 120 facing the first electrode 70. The first insulating layer 100 can support the edges of the first solid electrolyte layer 90 and the second solid electrolyte layer 120. The first insulating layer 100 can isolate the first main body 71 and the second main body 81, reducing the possibility of a short circuit or lithium plating between the first main body 71 and the second main body 81 due to cracking or detachment of the edges of at least one of the first solid electrolyte layer 90 and the second solid electrolyte layer 120 during the pressing process.

[0233] In some possible implementations, referring to FIG37, the first main body 71 includes a first current collector 711. A first connecting segment 721 is connected to the first current collector 711. The first electrode 70 includes a first active material layer 701. The first active material layer 701 is disposed on both the first current collector 711 and the first connecting segment 721. The separator 73 and the first solid electrolyte layer 90 are both disposed on the first active material layer 701.

[0234] The isolator 73 can protect the first connecting segment 721. After the first tab 72 is retracted, the first connecting segment 721 and the isolator 73 can deform simultaneously, for example, by bending. After the first tab 72 is retracted, the isolator 73 can isolate the first connecting segment 721 and the second main body 81, reducing the possibility of a short circuit between the first tab 72 and the second electrode plate 80 caused by contact between the first connecting segment 721 and the second main body 81.

[0235] In some possible implementations, referring to Figures 37 and 38, the second electrode 80 includes a second tab 82. The second body portion 81 includes a second current collector and a second active material layer 812. The second tab 82 is connected to the second current collector 811. The second current collector 811 is disposed with the second active material layer 812. A second solid electrolyte layer 120 is disposed on the second active material layer 812. The area of ​​the second solid electrolyte layer 120 may be equal to the area of ​​the second active material layer 812.

[0236] In some examples, a coating process is used to coat a solid electrolyte material onto the second active material layer 812 to form a second solid electrolyte layer 120. The coating process allows for precise control of the amount of solid electrolyte material coated, which helps to improve the thickness consistency and surface smoothness of the formed second solid electrolyte layer 120.

[0237] In some examples, the material of the first solid electrolyte layer 90 and the material of the second solid electrolyte layer 120 are the same.

[0238] In some possible implementations, as shown in Figure 39, the first insulating layer 100 protrudes from the second solid electrolyte layer 120 by a thickness of H0, the first main body portion 71 by a thickness of H1, and the first solid electrolyte layer 90 by a thickness of H2, wherein H0 = H1 / 2 + H2.

[0239] Along the thickness direction Z of the electrode assembly 60, a second electrode 80 and a second solid electrolyte layer 120 can be respectively disposed on both sides of the first electrode 70. A first insulating layer 100 is disposed on each second solid electrolyte layer 120. After the first electrode 70, the first solid electrolyte layer 90, the second electrode 80, the second solid electrolyte layer 120 and the first insulating layer 100 are stacked, two adjacent first insulating layers 100 can contact each other, so that the two first insulating layers 100 surround the first solid electrolyte layer 90 and the first main body 71, which helps to improve the protective and isolation effect of the first insulating layer 100 on the first solid electrolyte layer 90 and the first main body 71.

[0240] In some examples, the surface of the second solid electrolyte layer 120 facing the first electrode 70 is flat, resulting in a uniform overall thickness and good surface flatness. A first insulating layer 100 is disposed on the second solid electrolyte layer 120. The thickness of the first insulating layer 100 is H0, which protrudes from the second solid electrolyte layer 120.

[0241] In some examples, as shown in Figures 40 and 41, there is one first electrode 70. There are two second electrodes 80. A first electrode 70 is disposed between the two second electrodes 80. A second solid electrolyte layer 120 and a first insulating layer 100 are disposed on one side of the second main body 81.

[0242] In some examples, as shown in Figure 42, there are multiple first electrode plates 70 and multiple second electrode plates 80. The first electrode plates 70 and second electrode plates 80 are alternately arranged. Two second electrode plates 80 are located on the outermost sides. On the two outermost second electrode plates 80, a second solid electrolyte layer 120 and a first insulating layer 100 are disposed on one side of the second main body portion 81. On the second electrode plates 80 located between adjacent first electrode plates 70, a second solid electrolyte layer 120 and a first insulating layer 100 are respectively disposed on both sides of the second main body portion 81.

[0243] In some examples, as shown in Figure 43, there are multiple first electrodes 70 and multiple second electrodes 80. The first electrodes 70 and second electrodes 80 are alternately arranged. The two first electrodes 70 are located on the outermost sides. A second solid electrolyte layer 120 and a first insulating layer 100 are respectively provided on both sides of the second main body 81.

[0244] In some feasible implementations, the width of the first insulating layer 100 is equal to the width of the edge extension 8101. The first insulating layer 100 does not extend beyond the edge of the edge extension 8101. In the pressing process, an encapsulation film is used to encapsulate the overall structure of the stacked electrode and solid electrolyte layer before pressing. The arrangement that the first insulating layer 100 does not extend beyond the edge extension 8101 helps reduce the possibility of mutual compression between the first insulating layer 100 and the encapsulation film.

[0245] In some examples, the encapsulating film is made of one or more of the following materials: aluminum-plastic film, polyethylene, polypropylene, polytetrafluoroethylene, and polyimide.

[0246] In some examples, isostatic pressing is used during compression, with temperatures ranging from 25°C to 250°C, pressures from 100 MPa to 2000 MPa, and times from 3 to 30 minutes. The encapsulated structure can then be placed within a heat and pressure transfer medium, through which heat and pressure are conducted. This medium can be one of the following: esters, water, or gases.

[0247] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.

[0248] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.

[0249] This application also provides an electrical device, including a battery device 10 according to any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize the battery device 10.

[0250] Referring to Figure 44, this application embodiment also provides a method for manufacturing an electrode assembly 60, which includes:

[0251] A first electrode plate 70 is provided, including a first main body portion 71 and a first electrode tab 72;

[0252] A second electrode 80 is provided, the first electrode 70 and the second electrode 80 have opposite polarities, the second electrode 80 includes a second main body portion 81, the area of ​​the second main body portion 81 is larger than the area of ​​the first main body portion 71;

[0253] A first solid electrolyte layer 90 is provided. In the stacked first electrode 70, the first solid electrolyte layer 90, and the second electrode 80, the first solid electrolyte layer 90 is disposed between the first main body portion 71 and the second main body portion 81. The second main body portion 81 includes an edge extension portion 8101 that extends beyond the first main body portion 71.

[0254] A first insulating layer 100 is provided, which is disposed corresponding to the edge extension portion 8101. The first insulating layer 100 is disposed around the first main body portion 71 and the first insulating layer 100 encloses to form a receiving space 102. A portion of the first main body portion 71 is located within the receiving space 102. The first insulating layer 100 includes a tab lead-out channel 101, which is connected to the receiving space 102. The first tab 72 is led out from the tab lead-out channel 101.

[0255] In some possible implementations, referring to FIG44, a first solid electrolyte is disposed on a first body portion 71, and a first electrode 70 and a first solid electrolyte layer 90 form a first electrode 70 assembly. A second body portion 81 includes a circumferentially extending receiving portion 8102. A second insulating layer 110 is disposed within the receiving portion 8102. A first insulating layer 100 is disposed on the second insulating layer 110. The second electrode 80, the first insulating layer 100, and the second insulating layer 110 form a second electrode 80 assembly. The first electrode 70 assembly and the second electrode 80 assembly are stacked, with the first solid electrolyte layer 90 located between the first body portion 71 and the second body portion 81. A first tab 72 extends from a tab lead-out channel 101.

[0256] In some possible implementations, referring to FIG45, a first solid electrolyte layer 90 is provided on the second body portion 81. A first insulating layer 100 is provided on the first solid electrolyte layer 90. The second electrode 80, the first solid electrolyte layer 90, and the first insulating layer 100 form a composite structure. The first electrode 70 and the composite structure are stacked, with the first solid electrolyte located between the first body portion 71 and the second body portion 81. A first tab 72 is led out from the tab lead-out channel 101.

[0257] In some possible implementations, referring to FIG46, a first solid electrolyte is disposed on a first body portion 71, and a first electrode 70 and a first solid electrolyte layer 90 form a first electrode 70 assembly. A second solid electrolyte layer 120 is disposed on a second body portion 81. The area of ​​the second solid electrolyte layer 120 is larger than the area of ​​the first solid electrolyte layer 90. A first insulating layer 100 is disposed on the second solid electrolyte. The second electrode 80, the second solid electrolyte layer 120, and the first insulating layer 100 form a second electrode 80 assembly. The first electrode 70 assembly and the second electrode 80 assembly are stacked, with the second solid electrolyte layer 120 located between the first solid electrolyte layer 90 and the second body portion 81. A first tab 72 is led out from the tab lead-out channel 101.

[0258] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

An electrode assembly, wherein, include: The first electrode plate includes a first main body and a first electrode tab; The second electrode has the opposite polarity to the first electrode. The second electrode includes a second main body portion with an area larger than that of the first main body portion. The second main body portion includes an edge extension portion that extends beyond the first main body portion. A first solid electrolyte layer is disposed between the first main body portion and the second main body portion; A first insulating layer is disposed corresponding to the outer edge extension portion. The first insulating layer surrounds the first main body portion and forms an accommodating space. A portion of the first main body portion is located within the accommodating space. The first insulating layer includes a tab lead-out channel, which is connected to the accommodating space. The first tab is led out from the tab lead-out channel. The electrode assembly according to claim 1, wherein, The width of the electrode lead-out channel is greater than or equal to the width of the first electrode. The electrode assembly according to claim 1 or 2, wherein, Along the thickness direction of the electrode assembly, the tab lead-out channel penetrates the first insulating layer. The electrode assembly according to any one of claims 1 to 3, wherein, The first electrode includes an isolator disposed on the first electrode tab, the isolator passing through the electrode tab lead-out channel and extending beyond the first insulating layer. The electrode assembly according to claim 4, wherein, The first electrode includes a first connecting segment and a second connecting segment connected together. The first connecting segment is connected to the first main body. The first connecting segment passes through the electrode lead-out channel and extends beyond the first insulating layer. The first connecting segment is provided with the isolation member. The electrode assembly according to claim 5, wherein, The first main body includes a first current collection section and a first active material layer. The first current collection section is provided with the first active material layer. The first connecting section is connected to the first current collection section. The thickness of the isolation member is less than or equal to the thickness of the first active material layer. The electrode assembly according to claim 5, wherein, The first main body includes a first current collector, the first connecting section is connected to the first current collector, the first electrode includes a first active material layer, the first active material layer is disposed on both the first current collector and the first connecting section, the first solid electrolyte layer is located in the accommodating space, the first solid electrolyte layer is disposed on the first main body, and the separator and the first solid electrolyte layer are both disposed on the first active material layer. The electrode assembly according to claim 7, wherein, The thickness of the insulating element is less than or equal to the thickness of the first solid electrolyte layer. The electrode assembly according to any one of claims 4 to 8, wherein, The insulating component includes at least one of a ceramic structure, an insulating adhesive, an insulating tape, and a solid electrolyte structure. The electrode assembly according to any one of claims 1 to 9, wherein, The material of the first insulating layer includes at least one of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber. The electrode assembly according to any one of claims 1 to 10, wherein, The electrode assembly further includes a second insulating layer. The second main body includes a receiving portion that extends along the edge of the second main body. The second insulating layer is disposed within the receiving portion. The first insulating layer and the second insulating layer are stacked together. The first solid electrolyte layer is located within the receiving space. The edge of the first solid electrolyte layer overlaps with the second insulating layer. The electrode assembly according to claim 11, wherein, The second insulating layer includes a first part and a second part. The first insulating layer is stacked with the first part. The outer surface of the first insulating layer is flush with the outer surface of the first part. The second part extends beyond the first insulating layer. The edge of the first solid electrolyte layer overlaps with the second part. The electrode assembly according to claim 11 or 12, wherein, The first solid electrolyte layer is disposed on the first main body. The electrode assembly according to any one of claims 11 to 13, wherein, The second main body includes a second current collector and a second active material layer. The second active material layer is provided with the receiving portion, and the second insulating layer is disposed within the receiving portion. The second active material layer is in contact with the first solid electrolyte layer. The electrode assembly according to claim 14, wherein, The receiving portion does not penetrate the second active material layer along the thickness direction of the electrode assembly; or, the receiving portion penetrates the second active material layer along the thickness direction of the electrode assembly. The electrode assembly according to any one of claims 11 to 15, wherein, The receiving portion has a ring structure, and the second insulating layer has a closed ring structure. The electrode assembly according to any one of claims 11 to 16, wherein, The surface of the second insulating layer facing the first electrode is flush with the surface of the second main body facing the first electrode. The electrode assembly according to any one of claims 11 to 17, wherein, The width of the edge extension is equal to the width of the first insulating layer, and the width of the second insulating layer is greater than the width of the edge extension. The electrode assembly according to any one of claims 11 to 18, wherein, The thickness of the first insulating layer protruding from the second insulating layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, wherein H0 = H1 / 2 + H2. The electrode assembly according to any one of claims 11 to 19, wherein, The number of first electrode plates is one, the number of second electrode plates is two, and a first electrode plate is disposed between the two second electrode plates. The first insulating layer and the second insulating layer are disposed on one side of the second main body. or, The number of first electrodes is multiple, and the number of second electrodes is multiple. The first electrodes and second electrodes are alternately arranged, with two second electrodes located on the outermost side. On the two outermost second electrodes, the first insulating layer and the second insulating layer are disposed on one side of the second main body. On the second electrodes located between adjacent first electrodes, the first insulating layer and the second insulating layer are disposed on both sides of the second main body. Alternatively, the two first electrodes are located on the outermost side, and the first insulating layer and the second insulating layer are disposed on both sides of the second main body. The electrode assembly according to any one of claims 11 to 20, wherein, The material of the second insulating layer includes at least one of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber. The electrode assembly according to any one of claims 1 to 6, wherein, The first solid electrolyte layer is disposed on the second main body portion, the first solid electrolyte layer covers the edge extension portion, the first insulating layer is disposed on the first solid electrolyte layer, and the first main body portion is in contact with the first solid electrolyte layer. The electrode assembly according to claim 22, wherein, The thickness of the first insulating layer protruding from the first solid electrolyte layer is H0, and the thickness of the first main body is H1, wherein H0 = H1 / 2. The electrode assembly according to claim 22 or 23, wherein, The number of first electrodes is one, the number of second electrodes is two, and a first electrode is disposed between the two second electrodes. The first insulating layer and the first solid electrolyte layer are disposed on one side of the second main body; or... The number of first electrodes is multiple, and the number of second electrodes is multiple. The first electrodes and second electrodes are alternately arranged, with two second electrodes located on the outermost side. On the two outermost second electrodes, the first insulating layer and the first solid electrolyte layer are disposed on one side of the second main body. On the second electrodes located between adjacent first electrodes, the first insulating layer and the first solid electrolyte layer are disposed on both sides of the second main body. Alternatively, the two first electrodes are located on the outermost side, and the first insulating layer and the first solid electrolyte layer are disposed on both sides of the second main body. The electrode assembly according to any one of claims 1 to 5, 7, and 8, wherein, The electrode assembly further includes a second solid electrolyte layer disposed on the second main body portion and covering the edge extension portion. The first insulating layer is disposed on the second solid electrolyte layer and is located within the accommodating space. The first solid electrolyte layer is located between the second solid electrolyte layer and the first main body portion. The electrode assembly according to claim 25, wherein, The thickness of the first insulating layer protruding from the second solid electrolyte layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, wherein H0 = H1 / 2 + H2. The electrode assembly according to claim 25 or 26, wherein, The number of first electrode plates is one, the number of second electrode plates is two, and a first electrode plate is disposed between the two second electrode plates. A second solid electrolyte layer and a first insulating layer are disposed on one side of the second main body. or, The number of first electrodes is multiple, and the number of second electrodes is multiple. The first electrodes and second electrodes are alternately arranged, with two second electrodes located on the outermost side. On the two outermost second electrodes, a second solid electrolyte layer and a first insulating layer are disposed on one side of the second main body. On the second electrodes located between adjacent first electrodes, a second solid electrolyte layer and a first insulating layer are disposed on both sides of the second main body. Alternatively, two first electrodes are located on the outermost side, and a second solid electrolyte layer and a first insulating layer are disposed on both sides of the second main body. The electrode assembly according to any one of claims 1 to 27, wherein, The second electrode includes a second electrode tab, which is connected to the second main body portion. The first electrode tab and the second electrode tab are located on the same side of the first main body portion; or, the first electrode tab and the second electrode tab are located on opposite sides of the first main body portion. The electrode assembly according to any one of claims 1 to 28, wherein, Of the first electrode and the second electrode, one is a positive electrode and the other is a negative electrode. A type of battery cell, wherein, Includes the electrode assembly as described in any one of claims 1 to 29. A battery device, wherein, Includes the battery cell as described in claim 30. An electrical device, wherein, Includes the battery device as described in claim 31, wherein the battery device is used to provide electrical energy. A method for manufacturing an electrode assembly, wherein, include: A first electrode plate is provided, comprising a first main body and a first electrode tab; A second electrode is provided, wherein the first electrode has the opposite polarity to the second electrode, and the second electrode includes a second main body portion, the area of ​​which is larger than the area of ​​the first main body portion; A first solid electrolyte layer is provided. In the stacked first electrode, the first solid electrolyte layer and the second electrode, the first solid electrolyte layer is disposed between the first main body portion and the second main body portion. The second main body portion includes an edge extension portion that extends beyond the first main body portion. A first insulating layer is provided, corresponding to the outer edge extension portion. The first insulating layer surrounds the first main body portion and forms a receiving space. A portion of the first main body portion is located within the receiving space. The first insulating layer includes a tab lead-out channel, which is connected to the receiving space. The first tab is led out from the tab lead-out channel.

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