Battery cell, battery device, and electric device

Abstract

The present application provides a battery cell, a battery device, and an electric device. The battery cell comprises a casing and an electrode assembly. The electrode assembly is accommodated in the casing, and the electrode assembly comprises a first electrode sheet, a solid-state electrolyte layer, and a second electrode sheet which are sequentially stacked. The first electrode sheet and the second electrode sheet have opposite polarities. The first electrode sheet comprises a first current collector and a first active material layer. In a first direction, the first active material layer is arranged on the side of the first current collector facing the solid-state electrolyte layer. The electrode assembly further comprises first insulating members, the first insulating members are arranged around the first active material layer, each first insulating member has a first inner peripheral surface facing the first active material layer, each first insulating member is provided with a first exhaust channel, and each first exhaust channel is communicated with the outside of the electrode assembly and extends to the corresponding first inner peripheral surface. The first exhaust channels can be used to discharge gas from the first active material layer, thereby reducing the risk of damage to the electrode assembly and improving the yield of the battery cell.

Description

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

[0001] This application claims priority to Chinese patent application 2024226113132, filed on October 28, 2024, entitled “Battery Cell, Battery Device and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0003] 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.

[0004] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. A battery device consists of individual battery cells, and the yield rate of these cells is a significant issue during their manufacturing process. Therefore, improving the yield rate of individual battery cells is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device, which can improve the yield rate of battery cells.

[0006] In a first aspect, embodiments of this application provide a battery cell, including a casing and an electrode assembly. The electrode assembly is housed within the casing and includes a first electrode, a solid electrolyte layer, and a second electrode stacked together. The first and second electrodes have opposite polarities. At least a portion of the solid electrolyte layer is disposed between the first and second electrodes along a first direction. The first electrode includes a first current collector and a first active material layer. Along the first direction, the first active material layer is disposed on the side of the first current collector facing the solid electrolyte layer. The electrode assembly further includes a first insulating member surrounding the first active material layer. The first insulating member has a first inner peripheral surface facing the first active material layer. Along the first direction, at least a portion of the first insulating member is disposed between the first current collector and the solid electrolyte layer. The first insulating member has a first venting channel communicating with the external space of the electrode assembly and extending to the first inner peripheral surface.

[0007] In the above technical solution, by surrounding the first active material layer with a first insulating member, the position of the first active material layer can be restricted, making the first active material layer more stable between the solid electrolyte layer and the first current collector. By providing a first venting channel in the first insulating member, the first venting channel can discharge the gas in the first active material layer, reducing the risk of wrinkling of the first current collector and / or the first active material layer due to the inability of the gas in the first active material layer to be discharged during the pressing of the electrode assembly, thereby reducing the risk of damage to the electrode assembly and improving the yield of the battery cell.

[0008] In some embodiments, along a first direction, the first insulating member has a first surface facing the solid electrolyte layer and a second surface facing the first current collector. At least one first venting channel is a first venting groove, and the first surface is provided with the first venting groove.

[0009] In this embodiment, by providing a first exhaust groove on the first surface, the gas on the side of the first active material layer close to the solid electrolyte layer can be more easily discharged through the first exhaust groove, thereby improving the contact tightness between the first active material layer and the solid electrolyte layer, thereby promoting ion exchange between the first active material layer and the solid electrolyte layer, and thus improving the electrochemical performance of the electrode assembly.

[0010] In some embodiments, along a first direction, the first insulating member has a first surface facing the solid electrolyte layer and a second surface facing the first current collector. At least one first venting channel is a first venting groove, and the second surface is provided with the first venting groove.

[0011] In this embodiment, by providing a first exhaust groove on the second surface, the gas on the side of the first active material layer near the first current collector can be more easily discharged through the first exhaust groove, thereby improving the contact tightness between the first active material layer and the first current collector, thereby promoting electron exchange between the first active material layer and the first current collector, and thus improving the electrochemical performance of the electrode assembly.

[0012] In some embodiments, along a first direction, the first insulating member has a first surface facing the solid electrolyte layer and a second surface facing the first current collector. At least one first venting channel is a first venting groove, and both the first and second surfaces are provided with first venting grooves.

[0013] In this embodiment, by providing first venting grooves on both the first and second surfaces, multiple first venting grooves can promote the discharge of gas within the first active material layer, thereby promoting the contact between the first active material layer and the first current collector and the solid electrolyte layer, thus improving the electrochemical performance of the electrode assembly. In addition, multiple first venting grooves enhance the venting effect of the first active material layer, further reducing the risk of wrinkling of the first current collector or the first active material layer during the pressing process of the electrode assembly, thereby reducing the risk of damage to the electrode assembly.

[0014] In some embodiments, the first insulating member has a first outer peripheral surface disposed opposite to the first inner peripheral surface, and the two ends of the first vent groove extend to the first inner peripheral surface and the first outer peripheral surface, respectively. By providing that the two ends of the first vent groove extend to the first inner peripheral surface and the first outer peripheral surface, it is beneficial for the gas in the first active material layer to be drawn out of the electrode assembly from the second outer peripheral surface, which facilitates the processing of the first vent groove and reduces the processing cost of the first vent groove.

[0015] In some embodiments, a first venting groove is provided on the first surface, and a portion of the orthographic projection of the first venting groove does not overlap with the orthographic projection of the solid electrolyte layer in a projection plane perpendicular to the first direction. This allows gas in the first venting groove to be discharged from the electrode assembly from the first surface, and gas between the solid electrolyte layer and the first active material layer is more easily discharged from the first venting groove, making venting through the first venting channel more convenient.

[0016] In some embodiments, the second surface is provided with a first exhaust groove, and in a projection plane perpendicular to the first direction, a portion of the orthographic projection of the first exhaust groove does not overlap with the orthographic projection of the first current collector. This allows gas in the first exhaust groove to be discharged from the electrode assembly through the second surface, making it easier for gas between the first current collector and the first active material layer to be discharged from the first exhaust groove, and making exhaust through the first exhaust channel more convenient.

[0017] In some embodiments, the width of the first venting groove is 0.1mm-30mm. When the width of the first venting groove is greater than or equal to 0.1mm, the first venting groove has sufficient width to improve its ability to expel gas from the first active material layer; when the width of the first venting groove is less than or equal to 30mm, the first insulating member has sufficient structural strength, reducing the risk of the solid electrolyte layer or the first current collector collapsing into the first venting groove and reducing the risk of electrode assembly deformation. Therefore, when the width of the first venting groove is 0.1mm-30mm, it is possible to balance improving the ability of the first venting groove to expel gas from the first active material layer and reducing the risk of the solid electrolyte layer or the first current collector collapsing into the first venting groove.

[0018] In some embodiments, the depth of the first exhaust groove is 2μm-100μm. When the depth of the first exhaust groove is greater than or equal to 2μm, the first exhaust groove has sufficient depth to facilitate the extraction of gas from the first active material layer, thereby improving the exhaust capacity of the first exhaust channel. When the depth of the first exhaust groove is less than or equal to 100μm, the first insulating member has sufficient structural strength, reducing the risk of damage to the first insulating member and also reducing the risk of the first active material layer detaching from the electrode assembly through the first exhaust groove. Therefore, when the depth of the first exhaust groove is 2μm-100μm, it is possible to balance improving the exhaust capacity of the first exhaust channel and reducing the risk of damage to the first insulating member.

[0019] In some embodiments, the first insulating member includes multiple edges, which are connected end-to-end to form an annular structure, and at least one edge is provided with a first exhaust channel. By connecting the multiple edges end-to-end to form an annular structure, the annular structure can better restrict the position of the first active material layer. By providing a first exhaust channel on at least one edge, the exhaust capacity of the first active material layer around the edge where the first exhaust channel is provided can be enhanced, thereby improving the exhaust effect of the first active material layer.

[0020] In some embodiments, each edge is provided with a first exhaust channel. In this way, the gas in the first active material layer can be discharged from the electrode assembly through the exhaust channels provided on each edge, thereby improving the exhaust effect of the first exhaust channel, reducing the risk of damage to the electrode assembly, and improving the yield of the battery cell.

[0021] In some embodiments, in the side portion where the first exhaust channel is provided, the length of the side portion is L1, and the total width of the first exhaust channel along the extension direction of the side portion is L2, where 0.01≤L2 / L1≤0.2. When L2 / L1≥0.01, the first exhaust channel can effectively exhaust the gas in the first active material layer through the first exhaust channel on the side portion to the electrode assembly, thereby improving the exhaust capacity of the first exhaust channel; when L2 / L1≤0.2, it can improve the strength of the side portion and reduce the risk of damage to the side portion; therefore, when 0.01≤L2 / L1≤0.2, it is possible to balance improving the exhaust capacity of the first exhaust channel and improving the strength of the side portion.

[0022] In some embodiments, the first insulating member is provided with a plurality of first exhaust channels, which are spaced apart circumferentially along the first insulating member. The total width of the plurality of first exhaust channels along the circumferential direction of the first insulating member is L3, and the perimeter of the first inner circumferential surface is L4, where 0.01 ≤ L3 / L4 ≤ 0.2. When L3 / L4 ≥ 0.01, the plurality of first exhaust channels can effectively exhaust gas from the first active material layer to the electrode assembly, improving the exhaust capacity of the first exhaust channels. When L2 / L1 ≤ 0.2, the strength of the edge can be improved, reducing the risk of edge damage. Therefore, when 0.01 ≤ L2 / L1 ≤ 0.2, both the exhaust capacity of the first exhaust channels and the strength of the edge can be improved.

[0023] In some embodiments, along a first direction, a first active material layer is provided on both opposite sides of the first current collector, and each first active material layer is correspondingly provided with a first insulating member. In a projection plane perpendicular to the first direction, the orthographic projection of the first exhaust channel on one side of the first current collector does not overlap with the orthographic projection of the first exhaust channel on the other side of the first current collector. By ensuring that the projections of the first exhaust channels on the opposite sides of the first insulating members do not overlap, the first insulating member can have higher strength along the first direction, reducing the risk of the electrode assembly being damaged during pressing.

[0024] In some embodiments, the second electrode includes a second current collector and a second active material layer. Along a first direction, the second active material layer is disposed on the side of the second current collector facing the solid electrolyte layer. The electrode assembly also includes a second insulating member surrounding the second active material layer. The second insulating member has a second inner peripheral surface facing the second active material layer. Along the first direction, at least a portion of the second insulating member is disposed between the second current collector and the solid electrolyte layer. The second insulating member has a second venting channel communicating with the external space of the electrode assembly and extending to the second inner peripheral surface. By surrounding the second active material layer, the second insulating member can restrict the position of the second active material layer, making the second active material layer more stable between the solid electrolyte layer and the second current collector. By providing a second venting channel in the second insulating member, gas within the second active material layer can be discharged, reducing the risk of wrinkling of the second current collector or the second active material layer during the pressing of the electrode assembly due to the inability to expel gas from the second active material layer. In this way, gas within both the first and second active material layers can be discharged from the electrode assembly, thereby reducing the risk of damage to the electrode assembly and improving the yield of the battery cells.

[0025] In some embodiments, the orthographic projection of the first exhaust channel does not overlap with the orthographic projection of the second exhaust channel in a projection plane perpendicular to the first direction. This improves the strength of the first and second insulating members along the first direction and reduces the risk of the electrode assembly being damaged when subjected to pressure along the first direction.

[0026] In some embodiments, along a first direction, the second insulating member has a third surface facing the solid electrolyte layer and a fourth surface facing the second current collector. At least one second venting channel is a second venting groove, and the third surface is provided with the second venting groove.

[0027] In this embodiment, by providing a second exhaust groove on the third surface, the gas on the side of the second active material layer near the solid electrolyte layer can be discharged from the second exhaust groove, thereby improving the contact tightness between the second active material layer and the solid electrolyte layer, promoting ion exchange between the second active material layer and the solid electrolyte layer, and improving the electrochemical performance of the electrode assembly.

[0028] In some embodiments, along a first direction, the second insulating member has a third surface facing the solid electrolyte layer and a fourth surface facing the second current collector. At least one second venting channel is a second venting groove, and the fourth surface is provided with the second venting groove.

[0029] In this embodiment, by providing a second exhaust groove on the fourth surface, the gas on the side of the second active material layer near the second current collector can be more easily discharged through the second exhaust groove, thereby improving the contact tightness between the second active material layer and the second current collector, thereby promoting electron exchange between the second active material layer and the second current collector, and thus improving the electrochemical performance of the electrode assembly.

[0030] In some embodiments, along a first direction, the second insulating member has a third surface facing the solid electrolyte layer and a fourth surface facing the second current collector. At least one second venting channel is a second venting groove, and both the third and fourth surfaces are provided with second venting grooves.

[0031] In this embodiment, by providing second exhaust grooves on both the third and fourth surfaces, multiple second exhaust grooves can promote the discharge of gas within the second active material layer, thereby promoting the contact between the second active material layer and the second current collector, and promoting the contact between the second active material layer and the solid electrolyte layer, thus improving the electrochemical performance of the electrode assembly.

[0032] In some embodiments, the second insulating member has a second outer peripheral surface disposed opposite to the second inner peripheral surface, and the two ends of the second vent groove extend to the second inner peripheral surface and the second outer peripheral surface, respectively. By providing the two ends of the second vent groove to extend to the second inner peripheral surface and the second outer peripheral surface, it is beneficial for the gas in the first active material layer to be drawn out of the electrode assembly from the second outer peripheral surface, which facilitates the processing of the second vent groove and reduces the processing cost of the second vent groove.

[0033] In some embodiments, the third surface is provided with a second venting groove, and in a projection plane perpendicular to the first direction, a portion of the orthographic projection of the second venting groove does not overlap with the orthographic projection of the solid electrolyte layer. This allows gas in the second venting groove to escape from the third surface, making it easier for gas in the second active material layer to escape from the second venting groove, thus making the second venting channel more convenient.

[0034] In some embodiments, the fourth surface is provided with a second exhaust groove, and in a projection plane perpendicular to the first direction, a portion of the orthographic projection of the second exhaust groove does not overlap with the orthographic projection of the second current collector. This allows gas in the second exhaust groove to exit from the fourth surface, making it easier for gas in the second active material layer to exit from the second exhaust groove, thus making the second exhaust channel more convenient.

[0035] In some embodiments, a first insulating member connects a first current collector and a solid electrolyte layer. The first current collector, the first insulating member, and the solid electrolyte layer together define a first containment space, which communicates with the external space of the electrode assembly through a first exhaust channel. The first containment space, defined by the first current collector, the first insulating member, and the solid electrolyte layer, restricts the position of the first active material layer, thereby reducing the risk of the first active material layer detaching from the electrode assembly. Gas within the first containment space can be discharged through the first exhaust channel, which helps to reduce the volume within the first containment space, thus reducing the volume of the electrode assembly and increasing its volumetric energy density. It also allows for tighter contact between the first active material layer and the solid electrolyte layer, and between the first active material layer and the first current collector, improving the electrochemical performance of the electrode assembly.

[0036] Secondly, embodiments of this application provide a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0037] Thirdly, embodiments of this application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect or a battery device provided in any one of the embodiments of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device.

[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0040] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0041] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0042] Figure 3 is an exploded view of a single battery cell provided in some embodiments of this application;

[0043] Figure 4 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0044] Figure 5 is a cross-sectional view AA of Figure 4;

[0045] Figure 6 is a magnified view of a portion of region A in Figure 5;

[0046] Figure 7 is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0047] Figure 8 is a magnified view of region B in Figure 7;

[0048] Figure 9 is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0049] Figure 10 is a magnified view of region C in Figure 9;

[0050] Figure 11 is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0051] Figure 12 is a magnified view of region D in Figure 11;

[0052] Figure 13 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0053] Figure 14 is a BB cross-sectional view of Figure 13;

[0054] Figure 15 is a magnified view of a portion of region E in Figure 13;

[0055] Figure 16 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0056] Figure 17 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0057] Figure 18 is a magnified view of region F in Figure 17.

[0058] Markings: 1-Electrode assembly; 11-First electrode; 111-First current collector; 112-First active material layer; 12-Solid electrolyte layer; 13-Second electrode; 131-Second current collector; 132-Second active material layer; 14-First insulating element; 141-First inner circumferential surface; 142-First exhaust channel; 1421-First exhaust groove; 143-First outer circumferential surface; 144-First surface; 145-Second surface; 146-Edge; 15-Second insulating element ; 151-Second inner circumferential surface; 152-Second exhaust channel; 1521-Second exhaust groove; 153-Second outer circumferential surface; 154-Third surface; 155-Fourth surface; 16-First accommodating space; 2-Outer shell; 21-Housing shell; 22-End cap; 3-Electrode terminal; 10-Battery cell; 20-Box; 100-Battery assembly; 201-First box; 202-Second box; 200-Controller; 300-Motor; 1000-Vehicle; X-First direction. Detailed Implementation

[0059] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0062] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0065] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0066] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0067] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0068] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0070] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0071] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2)) and their modified compounds.

[0073] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0074] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0075] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0077] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0078] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0080] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0081] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0082] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0083] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0084] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0085]

[0086] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0087] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0088] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0089] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0090] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0091] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0092] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0093] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0094] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0095] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0096] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0097] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0098] For a typical battery cell, the battery cell may include a casing and an electrode assembly. The electrode assembly is housed within the casing and may include a first electrode, a separator, and a second electrode. The first electrode and the second electrode have opposite polarities. The separator is disposed between the first electrode and the second electrode to separate them. The first electrode includes a first current collector and a first active material layer. The first active material layer is disposed on the side of the first current collector facing the separator.

[0099] In a solid-state battery cell, the solid electrolyte layer acts as a separator between the first and second electrodes. During the production of the battery cell, a pressing process is required for the electrode assembly. On the one hand, the pressing process allows for closer contact between the active material and the solid electrolyte, improving the ion conduction capability between the active material and the solid electrolyte layer. On the other hand, the pressing process densifies the active material, expelling gases from within the active material from the electrode assembly, thereby reducing the internal resistance of the active material and improving its electrochemical performance.

[0100] However, during the pressing process, the first active material layer may be squeezed out of the electrode assembly. In order to limit the position of the first active material layer, a first insulating member can be provided between the first current collector and the solid electrolyte layer. The first insulating member is provided around the first active material layer. By limiting the position of the first active material layer by the first insulating member, the risk of the first active material layer detaching from its position can be reduced.

[0101] However, during the pressing process, a sealed space can easily form between the first current collector, the first insulating component, and the solid electrolyte layer. This prevents the gas in the first active material layer from escaping from the electrode assembly, making it easy for air cavities to form between the solid electrolyte layer and the first active material layer or between the first active material layer and the first current collector. These air cavities can cause wrinkles in the first current collector or the first active material layer, leading to damage to the electrode assembly and increasing the defect rate of the battery cells.

[0102] In view of this, in order to improve the yield of battery cells, this application provides a battery cell by providing a first exhaust channel in the first insulating part of the electrode assembly. The first exhaust channel is connected to the outside of the electrode assembly and extends to the first inner peripheral surface of the first insulating part facing the first active material layer. This allows the gas in the first active material layer to be discharged from the electrode assembly through the first exhaust channel, reducing the risk of damage to the electrode assembly and improving the yield of the battery cell.

[0103] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0104] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0105] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0106] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0107] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0108] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and battery cells 10, with the housing 20 used to house the battery cells 10.

[0109] The housing 20 has an enclosed space inside for accommodating the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which are interlocked. The first housing 201 and the second housing 202 can have various shapes, such as cuboids or cylinders. The first housing 201 can be a hollow structure open on one side, and the second housing 202 can also be a hollow structure open on one side. The open side of the second housing 202 interlocks with the open side of the first housing 201, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 201 can be a hollow structure open on one side, and the second housing 202 can be a plate-like structure, with the second housing 202 interlocked with the open side of the first housing 201, thus forming a housing 20 with an accommodating space.

[0110] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0111] Please refer to Figure 3, which is an exploded view of a battery cell 10 provided in some embodiments of this application. The battery cell 10 may include an electrode assembly 1 and a housing 2, with the electrode assembly 1 housed within the housing 2.

[0112] In some embodiments, the housing 2 may include a housing 21 and an end cap 22, the housing 21 having an opening, and the end cap 22 closing the opening of the housing 21. Here, "closed" means covered or shut off, and can be either sealed or unsealed.

[0113] The housing 21 is a component used to house the electrode assembly 1. The housing 21 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 21 can have various shapes, such as cylindrical or cuboid. The housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 1 can be partially or completely located within the housing 21.

[0114] End cap 22 and housing 21 together define a receiving space for accommodating electrode assembly 1 and other components. End cap 22 can be connected to housing 21 by welding, rolling, or other methods to close the opening of housing 21. The shape of end cap 22 can be adapted to the shape of housing 21. For example, if housing 21 is a cuboid structure, end cap 22 can be a rectangular plate structure adapted to housing 21; or if housing 21 is a cylindrical structure, end cap 22 can be a circular plate structure adapted to housing 21. The material of end cap 22 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The materials of end cap 22 and housing 21 can be the same or different.

[0115] In an embodiment where the housing 21 has an opening at one end, one end cap 22 may be provided. In an embodiment where the housing 21 has openings at both opposite ends, two end caps 22 may be provided, with the two end caps 22 respectively closing the two openings of the housing 21, and the two end caps 22 and the housing 21 together defining the receiving space.

[0116] In some embodiments, the battery cell 10 may further include electrode terminals 3, which are disposed on the housing 2. The electrode terminals 3 are used for electrical connection with the tabs of the electrode assembly 1 to input or output electrical energy from the battery cell 10. The electrode terminals 3 may be disposed on the housing 21 of the housing 2 or on the end cap 22 of the housing 2. The electrode terminals 3 and the tabs may be directly connected, for example, by welding the electrode terminals 3 to the tabs. The electrode terminals 3 and the tabs may also be indirectly connected, for example, by a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0117] Please refer to Figures 4 and 5. Figure 4 is a structural schematic diagram of a battery cell 10 provided in some embodiments of this application; Figure 5 is a cross-sectional view AA of Figure 4. This application provides a battery cell 10, including a housing 2 and an electrode assembly 1. The electrode assembly 1 is housed within the housing 2. The electrode assembly 1 includes a first electrode 11, a solid electrolyte layer 12, and a second electrode 13 stacked together. The first electrode 11 and the second electrode 13 have opposite polarities. At least a portion of the solid electrolyte layer 12 is disposed between the first electrode 11 and the second electrode 13 along a first direction X. The first electrode 11 includes a first current collector 111 and a first active material layer 112. Along the first direction X, the first active material layer 112 is disposed on the side of the first current collector 111 facing the solid electrolyte layer 12. The electrode assembly 1 further includes a first insulating member 14, which surrounds the first active material layer 112. The first insulating member 14 has a first inner peripheral surface 141 facing the first active material layer 112. Along the first direction X, at least a portion of the first insulating member 14 is disposed between the first current collector 111 and the solid electrolyte layer 12. The first insulating member 14 is provided with a first exhaust channel 142, which communicates with the external space of the electrode assembly 1 and extends to the first inner peripheral surface 141.

[0118] The first electrode 11 can be the positive electrode, the second electrode 13 can be the negative electrode, and the first active material layer 112 can be the positive active material; or the first electrode 11 can be the negative electrode, the second electrode 13 can be the positive electrode, and the second active material layer 132 can be the negative active material.

[0119] The solid electrolyte layer 12 may be disposed only in part between the first electrode 11 and the second electrode 13; or the entire solid electrolyte layer 12 may be disposed between the first electrode 11 and the second electrode 13. It is understood that the solid electrolyte layer 12 connects the first electrode 11 and the second electrode 13.

[0120] The first active material layer 112 may be provided on only one side of the first current collector 111, and a solid electrolyte layer 12 may be provided on the side of the first active material layer 112 facing away from the first current collector 111; or the first active material layer 112 may be provided on both opposite sides of the first current collector 111, and a solid electrolyte layer 12 may be provided on the side of one first active material layer 112 facing away from the first current collector 111, and a solid electrolyte layer 12 may also be provided on the side of the other first active material layer 112 facing away from the first current collector 111.

[0121] The first insulating member 14 is disposed around the first active material layer 112. The inner peripheral surface of the first insulating member 14 may surround the outer edge of the outer edge of the first active material layer 112, such that the entire first active material layer 112 is located within the inner peripheral surface of the first insulating member 14. Alternatively, the inner peripheral surface of the first insulating member 14 may only surround a portion of the first active material layer 112, with the other portion of the first active material layer 112 located outside the inner peripheral surface of the first insulating member 14; for example, the other portion of the first active material layer 112 may be located between the solid electrolyte layer 12 and the first insulating member 14.

[0122] The first inner peripheral surface 141 of the first insulating member 14 is the surface of the first insulating member 14 facing the first active material layer 112 and surrounding the first active material layer 112. The first inner peripheral surface 141 can be a single surface; for example, the first insulating member 14 is annular, and the first inner peripheral surface 141 is the inner surface of the first insulating member 14 facing the first active material layer 112. The first inner peripheral surface 141 can also be a combination of multiple surfaces; for example, the first insulating member 14 is rectangular annular, and the first insulating member 14 has four inner surfaces facing the first active material layer 112, and these four inner surfaces are the first inner peripheral surface 141. It is understood that the projection of the first inner peripheral surface 141 along the first direction X can be circular, polygonal, etc. The projection shape of the first insulating member 14 along the first direction X can be the same as or different from the first active material layer 112. The first insulating member 14 is made of an insulating material, such as polyimide, polyetheretherketone, polyphenylene sulfide, silicone rubber, etc. The first direction X is parallel to the thickness direction of the first current collector 111.

[0123] The first insulating element 14 may be entirely disposed between the first current collector 111 and the solid electrolyte layer 12, or only a portion of the first insulating element 14 may be disposed between the first current collector 111 and the solid electrolyte layer 12.

[0124] The first insulating member 14 may connect the first current collector 111 and the solid electrolyte layer 12. Alternatively, the first insulating member 14 may connect only one of the first current collector 111 and the solid electrolyte layer 12; for example, the first insulating member 14 may connect the first current collector 111, and a portion of the first active material layer 112 may be located between the first insulating member 14 and the solid electrolyte layer 12 to separate the first insulating member 14 and the solid electrolyte layer 12; or, for another example, the first insulating member 14 may connect the solid electrolyte layer 12, and a portion of the first active material layer 112 may be located between the first insulating member 14 and the first current collector 111 to separate the first insulating member 14 and the first current collector 111.

[0125] A first exhaust channel 142 is disposed on the first insulating member 14 and extends to the first inner peripheral surface 141, such that one vent of the first exhaust channel 142 can face the first active material layer 112, so that the first exhaust channel 142 can guide the gas in the first active material layer 112 and the gas in the area surrounded by the first inner peripheral surface 141 to the outside of the electrode assembly 1. The first exhaust channel 142 may be disposed in a groove of the first insulating member 14 or a hole penetrating the first insulating member 14. The first exhaust channel 142 can have one vent on its first inner circumferential surface 141, and only one exhaust port on the side of the first insulating member 14 exposed to the electrode assembly 1. Gas can enter the vent and then be discharged to the outside of the electrode assembly 1 through the exhaust port. Alternatively, the first exhaust channel 142 can have one vent on its first inner circumferential surface 141, and multiple exhaust ports on the side of the first insulating member 14 exposed to the electrode assembly 1. Gas can enter the vent and then be discharged to the outside of the electrode assembly 1 through the multiple exhaust ports. It is understood that the number of vents and exhaust ports in the same first exhaust channel 142 can be one or multiple. The first exhaust channel 142 can be one or multiple.

[0126] The external space of electrode assembly 1 can be the space between electrode assembly 1 and housing 2, and the space between electrode assembly 1 and housing 2 is the space inside housing 2 that is not occupied by electrode assembly 1.

[0127] In this embodiment, by surrounding the first active material layer 112 with the first insulating member 14, the position of the first active material layer 112 can be restricted, making the first active material layer 112 more stable between the solid electrolyte layer 12 and the first current collector 111. By providing a first venting channel 142 in the first insulating member 14, the first venting channel 142 can discharge the gas inside the first active material layer 112, reducing the risk of wrinkling of the first current collector 111 or the first active material layer 112 due to the inability of the gas in the first active material layer 112 to be discharged during the pressing of the electrode assembly 1, thereby reducing the risk of damage to the electrode assembly 1 and improving the yield of the battery cell 10.

[0128] In some embodiments, please refer to Figures 5-8. Figure 6 is a partial enlarged view of region A in Figure 5; Figure 7 is a partial structural schematic diagram of the battery cell 10 provided in some embodiments of this application; Figure 8 is a partial enlarged view of region B in Figure 7. Along the first direction X, the first insulating member 14 has a first surface 144 facing the solid electrolyte layer 12 and a second surface 145 facing the first current collector 111. At least one first venting channel 142 is a first venting groove 1421, and the first surface 144 is provided with the first venting groove 1421.

[0129] It is possible that only the first surface 144 of the first insulating member 14 is connected to the solid electrolyte layer 12; it is also possible that only the second surface 145 of the first insulating member 14 is connected to the first current collector 111; or it is possible that the first surface 144 of the first insulating member 14 is connected to the solid electrolyte layer 12 and the second surface 145 of the first insulating member 14 is connected to the first current collector 111.

[0130] It can be that there is only one first exhaust channel 142 which is a first exhaust groove 1421. The first exhaust groove 1421 is disposed on the first surface 144, extends to the first inner peripheral surface 141, and communicates with the outside of the electrode assembly 1; or it can be that there are multiple first exhaust channels 142 which are all first exhaust grooves 1421. Multiple first exhaust grooves 1421 are disposed on the first surface 144, each first exhaust groove 1421 extends to the first inner peripheral surface 141, and communicates with the outside of the electrode assembly 1.

[0131] In this embodiment, by providing a first exhaust groove 1421 on the first surface 144, the gas on the side of the first active material layer 112 close to the solid electrolyte layer 12 can be more easily discharged through the first exhaust groove 1421, thereby improving the contact tightness between the first active material layer 112 and the solid electrolyte layer 12, thereby promoting ion exchange between the first active material layer 112 and the solid electrolyte layer 12, and thus improving the electrochemical performance of the electrode assembly 1.

[0132] In some embodiments, along the first direction X, the first insulating member 14 has a first surface 144 facing the solid electrolyte layer 12 and a second surface 145 facing the first current collector 111. At least one first venting channel 142 is a first venting groove 1421, and the second surface 145 is provided with the first venting groove 1421.

[0133] It can be that there is only one first exhaust channel 142 which is a first exhaust groove 1421. The first exhaust groove 1421 is disposed on the second surface 145, extends to the first inner peripheral surface 141, and communicates with the outside of the electrode assembly 1; or it can be that there are multiple first exhaust channels 142 which are all first exhaust grooves 1421. The multiple first exhaust grooves 1421 are all disposed on the second surface 145, and each first exhaust groove 1421 extends to the first inner peripheral surface 141 and communicates with the outside of the electrode assembly 1.

[0134] In this embodiment, by providing a first exhaust groove 1421 on the second surface 145, the gas on the side of the first active material layer 112 close to the first current collector 111 can be more easily discharged through the first exhaust groove 1421, thereby improving the contact tightness between the first active material layer 112 and the first current collector 111, thereby promoting electron exchange between the first active material layer 112 and the first current collector 111, and thus improving the electrochemical performance of the electrode assembly 1.

[0135] In some embodiments, along the first direction X, the first insulating member 14 has a first surface 144 facing the solid electrolyte layer 12 and a second surface 145 facing the first current collector 111. A plurality of first exhaust channels 142 are first exhaust grooves 1421, and both the first surface 144 and the second surface 145 are provided with first exhaust grooves 1421.

[0136] The first surface 144 may have a first exhaust groove 1421, and the second surface 145 may have one or more first exhaust grooves 1421; or the first surface 144 may have multiple first exhaust grooves 1421, and the second surface 145 may have only one or more first exhaust grooves 1421.

[0137] In this embodiment, by providing first venting grooves 1421 on both the first surface 144 and the second surface 145, the multiple first venting grooves 1421 can promote the discharge of gas within the first active material layer 112, thereby promoting the contact between the first active material layer 112 and the first current collector 111 and the first active material layer 112 and the solid electrolyte layer 12, thus improving the electrochemical performance of the electrode assembly 1. In addition, the multiple first venting grooves 1421 enhance the venting effect of the first active material layer 112, further reducing the risk of wrinkling of the first current collector 111 or the first active material layer 112 during the pressing process of the electrode assembly 1, thereby reducing the risk of damage to the electrode assembly 1.

[0138] In some embodiments, please continue to refer to Figures 5-8. The first insulating member 14 has a first outer peripheral surface 143 disposed opposite to the first inner peripheral surface 141, and the two ends of the first vent groove 1421 extend to the first inner peripheral surface 141 and the first outer peripheral surface 143, respectively.

[0139] The first exhaust groove 1421 has two ends, one end extending to the first inner peripheral surface 141 and the other end extending to the first outer peripheral surface 143. The projection of the first exhaust groove 1421 along the first direction X can be rectangular, trapezoidal, etc.

[0140] For example, as shown in FIG6, the first surface 144 of the first insulating member 14 is provided with a first venting groove 1421, which extends through the first inner peripheral surface 141 and the first outer peripheral surface 143 along the extension direction of the wall thickness of the first insulating member 14.

[0141] By setting the two ends of the first exhaust groove 1421 to extend to the first inner peripheral surface 141 and the first outer peripheral surface 143 respectively, it is beneficial for the gas in the first active material layer 112 to be drawn out from the second outer peripheral surface 153 to the electrode assembly 1, which facilitates the processing of the first exhaust groove 1421 and reduces the processing cost of the first exhaust groove 1421.

[0142] In some embodiments, please refer to Figures 9 and 10. Figure 9 is a partial structural schematic diagram of a battery cell 10 provided in some embodiments of this application; Figure 10 is a partial enlarged view of region C in Figure 9. A first venting groove 1421 is provided on the first surface 144. In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the first venting groove 1421 does not overlap with the orthographic projection of the solid electrolyte layer 12.

[0143] In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the first vent groove 1421 does not overlap with the orthographic projection of the solid electrolyte layer 12. That is, a portion of the first surface 144 is exposed in the solid electrolyte layer 12, and a portion of the first vent groove 1421 is located in that portion of the first surface 144, so that a portion of the first vent groove 1421 is exposed in the solid electrolyte layer 12, thereby enabling the first vent groove 1421 to communicate with the outside of the electrode assembly 1. Alternatively, the first vent groove 1421 may penetrate through the first inner peripheral surface 141 and the first outer peripheral surface 143; or one end of the first vent groove 1421 may extend to the first inner peripheral surface 141, and the other end may extend to the portion of the first surface 144 exposed in the solid electrolyte layer 12, thereby enabling the first vent groove 1421 to communicate with the outside of the electrode assembly 1. It is understood that, in the projection plane perpendicular to the first direction X, a portion of the orthographic projection of the first exhaust groove 1421 does not overlap with the orthographic projection of the solid electrolyte layer 12, and the solid electrolyte layer 12 covers this portion of the first exhaust groove 1421; another portion of the orthographic projection of the first exhaust groove 1421 overlaps with the orthographic projection of the solid electrolyte layer 12, and this portion of the first exhaust groove 1421 is exposed in the solid electrolyte layer 12.

[0144] In this embodiment, by ensuring that a portion of the orthographic projection of the first exhaust groove 1421 does not overlap with the orthographic projection of the solid electrolyte layer 12 in a projection plane perpendicular to the first direction X, the gas in the first exhaust groove 1421 can be discharged from the electrode assembly 1 through the first surface 144. The gas between the solid electrolyte layer 12 and the first active material layer 112 is more easily discharged from the first exhaust groove 1421, making it more convenient to exhaust gas from the first exhaust channel 142.

[0145] In some embodiments, please refer to Figures 11 and 12. Figure 11 is a partial structural schematic diagram of the battery cell 10 provided in some embodiments of this application; Figure 12 is a partial enlarged view of region D in Figure 11. The second surface 145 is provided with a first venting groove 1421. In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the first venting groove 1421 does not overlap with the orthographic projection of the first current collector 111.

[0146] In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the first vent groove 1421 does not overlap with the orthographic projection of the first current collector 111. That is, a portion of the second surface 145 is exposed above the first current collector 111, and a portion of the first vent groove 1421 is located on that portion of the second surface 145, so that a portion of the first vent groove 1421 is exposed above the first current collector 111, thereby enabling the first vent groove 1421 to communicate with the outside of the electrode assembly 1. Alternatively, the first vent groove 1421 may penetrate through the first inner peripheral surface 141 and the first outer peripheral surface 143; or one end of the first vent groove 1421 may extend to the first inner peripheral surface 141, and the other end may extend to the portion of the second surface 145 exposed above the first current collector 111, thereby enabling the first vent groove 1421 to communicate with the outside of the electrode assembly 1.

[0147] In this embodiment, by setting a portion of the orthographic projection of the first exhaust groove 1421 in the projection plane perpendicular to the first direction X so that it does not overlap with the orthographic projection of the first current collector 111, the gas in the first exhaust groove 1421 can be discharged from the electrode assembly 1 from the second surface 145, making it easier for the gas between the first current collector 111 and the first active material layer 112 to be discharged from the first exhaust groove 1421, and making it more convenient for the first exhaust channel 142 to exhaust.

[0148] In some embodiments, please refer to Figures 13 and 14. Figure 13 is a structural schematic diagram of the electrode assembly 1 provided in some embodiments of this application; Figure 14 is a BB cross-sectional view of Figure 13. The width of the first exhaust groove 1421 is 0.1mm-30mm.

[0149] There can be one or more first exhaust grooves 1421. In embodiments where there are multiple first exhaust grooves 1421, the widths of the multiple first exhaust grooves 1421 can be equal or unequal. The first exhaust groove 1421 can have various shapes. It can be a rectangular groove with a width equal to the width of the rectangle; or it can be a trapezoidal groove extending along one of the first inner surface and the first outer surface to the other, with the width of the first exhaust groove 1421 gradually increasing. The width of the first exhaust groove 1421 is a range between the minimum and maximum width of the first exhaust groove 1421.

[0150] The width of the first exhaust groove 1421 is K1, which can be any point value or a range between any two of the following: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 11mm, 13mm, 15mm, 17mm, 19mm, 20mm, 21mm, 23mm, 25mm, 27mm, 29mm, and 30mm.

[0151] In this embodiment, when the width of the first exhaust groove 1421 is greater than or equal to 0.1 mm, the first exhaust groove 1421 can have sufficient width to improve the ability of the first exhaust groove 1421 to discharge gas from the first active material layer 112; when the width of the first exhaust groove 1421 is less than or equal to 30 mm, the first insulating member 14 can have sufficient structural strength to reduce the risk of the solid electrolyte layer 12 or the first current collector 111 collapsing into the first exhaust groove 1421 and reduce the risk of deformation of the electrode assembly 1; therefore, when the width of the first exhaust groove 1421 is 0.1 mm to 30 mm, it is possible to balance improving the ability of the first exhaust groove 1421 to discharge gas from the first active material layer 112 and reducing the risk of the solid electrolyte layer 12 or the first current collector 111 collapsing into the first exhaust groove 1421.

[0152] In some embodiments, please refer to Figure 15, which is a partial enlarged view of region E in Figure 13. The depth of the first exhaust groove 1421 is 2μm-100μm.

[0153] The depth of the first exhaust groove 1421 refers to the maximum depth of the first exhaust groove 1421. There can be one first exhaust groove 1421, and its depth can be any value between 2μm and 100μm. There can also be multiple first exhaust grooves 1421, and their depths can be equal or unequal. It is worth noting that in embodiments where both the first surface 144 and the second surface 145 are provided with first exhaust grooves 1421, the first exhaust grooves 1421 on the first surface 144 and the first exhaust grooves 1421 on the second surface 145 can overlap along the first direction X, and the sum of the depths of the two first exhaust grooves 1421 should also be a value between 2μm and 100μm.

[0154] The depth of the first exhaust groove 1421 is H1, which can be any point value or a range value between any two of the following: 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, and 100μm.

[0155] In this embodiment, when the depth of the first exhaust groove 1421 is greater than or equal to 2 μm, the first exhaust groove 1421 has sufficient depth to facilitate the extraction of gas from the first active material layer 112 and improve the exhaust capacity of the first exhaust channel 142. When the depth of the first exhaust groove 1421 is less than or equal to 100 μm, the first insulating member 14 has sufficient structural strength, reducing the risk of the first insulating member 14 being damaged and also reducing the risk of the first active material layer 112 detaching from the electrode assembly 1 through the first exhaust groove 1421. Therefore, when the depth of the first exhaust groove 1421 is 2 μm-100 μm, it is possible to balance improving the exhaust capacity of the first exhaust channel 142 and reducing the risk of the first insulating member 14 being damaged.

[0156] In some embodiments, please continue to refer to FIG14. The first insulating member 14 includes a plurality of edges 146, which are connected end to end to form a ring structure, and at least one edge 146 is provided with a first exhaust channel 142.

[0157] It is possible that only one edge 146 is provided with the first exhaust passage 142, or multiple edges 146 are provided with the first exhaust passage 142. Among the edges 146 provided with the first exhaust passage 142, it is possible that the edge 146 is provided with only one first exhaust passage 142, or multiple first exhaust passages 142.

[0158] By connecting multiple edges 146 end to end to form a ring structure, the ring structure can better restrict the position of the first active material layer 112. By providing a first exhaust channel 142 on at least one edge 146, the exhaust capacity of the first active material layer 112 around the edge 146 where the first exhaust channel 142 is provided can be enhanced, thereby improving the exhaust effect of the first active material layer 112.

[0159] In some embodiments, please refer to Figure 14. Each edge 146 is provided with a first exhaust passage 142.

[0160] The number of first exhaust channels 142 provided on each edge 146 may be equal or unequal. Each edge 146 may have only one first exhaust channel 142 or multiple first exhaust channels 142.

[0161] In this embodiment, by providing a first exhaust channel 142 on each side 146, the gas in the first active material layer 112 can be discharged from the electrode assembly 1 through the exhaust channel provided on each side 146, thereby improving the exhaust effect of the first exhaust channel 142, reducing the risk of damage to the electrode assembly 1, and improving the yield of the battery cell 10.

[0162] In some embodiments, please continue to refer to FIG14. In the side portion 146 where the first exhaust passage 142 is provided, the length of the side portion 146 is L1, and the total width of the first exhaust passage 142 along the extending direction of the side portion 146 is L2, 0.01≤L2 / L1≤0.2.

[0163] In an embodiment where the edge 146 has only one first exhaust channel 142, the total width of the first exhaust channel 142 along the extension direction of the edge 146 is the width of the first exhaust channel 142; in an embodiment where the edge 146 has multiple first exhaust channels 142, the total width of the first exhaust channels 142 along the extension direction of the edge 146 is the sum of the widths of the multiple first exhaust channels 142.

[0164] As an example, as shown in Figure 14, the length of the side 146 is L1, and three first exhaust channels 142 are provided on the side 146. The widths of the three first exhaust channels 142 are K and K, respectively. 11 K 12 K 13 The total width L2 of the first exhaust passage 142 along the extension direction of the edge 146 is K. 11 +K 12 +K 13 .

[0165] L2 / L1 can be any point value from 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 01, 0.11, 012, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 019, 0.2, or a range between any two.

[0166] In this embodiment, when L2 / L1≥0.01, the first exhaust channel 142 can effectively exhaust the gas in the first active material layer 112 through the first exhaust channel 142 on the edge 146 to the electrode assembly 1, thereby improving the exhaust capacity of the first exhaust channel 142; when L2 / L1≤0.2, it can improve the strength of the edge 146 and reduce the risk of the edge 146 being damaged; therefore, when 0.01≤L2 / L1≤0.2, it is possible to balance improving the exhaust capacity of the first exhaust channel 142 and improving the strength of the edge 146.

[0167] In some embodiments, the first insulating member 14 is provided with a plurality of first exhaust channels 142, which are spaced apart along the circumference of the first insulating member 14. The total width of the plurality of first exhaust channels 142 along the circumference of the first insulating member 14 is L3, and the perimeter of the first inner circumferential surface 141 is L4, where 0.01≤L3 / L4≤02.

[0168] Multiple first exhaust channels 142 are spaced apart along the circumference of the first insulating member 14, and there is a certain distance between two adjacent first exhaust channels 142 along the circumference of the first insulating member 14. The total width of all the first exhaust channels 142 located on the same first insulating member 14 is L3. The total width of the multiple first exhaust channels 142 is the sum of the widths of all the first exhaust channels 142 on the first insulating member 14.

[0169] L3 / L4 can be any one of the following point values: 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 01, 0.11, 012, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 019, 0.2, or a range between any two.

[0170] In this embodiment, when L3 / L4≥0.01, the multiple first exhaust channels 142 can effectively exhaust the gas in the first active material layer 112 through the multiple first exhaust channels 142 to the electrode assembly 1, thereby improving the exhaust capacity of the first exhaust channels 142; when L2 / L1≤0.2, the strength of the edge 146 can be improved, reducing the risk of the edge 146 being damaged; therefore, when 0.01≤L2 / L1≤0.2, both the exhaust capacity of the first exhaust channels 142 and the strength of the edge 146 can be improved.

[0171] In some embodiments, please refer to FIG16, which is a schematic diagram of the structure of an electrode assembly 1 provided in some embodiments of this application. Along the first direction X, a first active material layer 112 is provided on both opposite sides of the first current collector 111, and a first insulating member 14 is provided for each first active material layer 112. In a projection plane perpendicular to the first direction X, the orthographic projection of the first exhaust channel 142 on the first insulating member 14 on one side of the first current collector 111 does not overlap with the orthographic projection of the first exhaust channel 142 on the first insulating member 14 on the other side of the first current collector 111.

[0172] The first active material layer 112 and the first insulating member 14 correspond one-to-one, with one first insulating member 14 surrounding one first active material layer 112. The orthographic projection of the first exhaust channel 142 on the first insulating member 14 located on one side of the first current collector 111 does not overlap with the orthographic projection of the first exhaust channel 142 on the first insulating member 14 located on the other side of the first current collector 111, that is, there is no overlapping area between the orthographic projection of the first exhaust channel 142 on the first insulating member 14 located on one side of the first current collector 111 and the orthographic projection of the first exhaust channel 142 on the first insulating member 14 located on the other side of the first current collector 111. The orthographic projection of the first exhaust channel 142 on the first insulating member 14 on one side of the first collector 111 can be spaced apart from the orthographic projection of the first exhaust channel 142 on the first insulating member 14 on the other side of the first collector 111. Alternatively, the edge of the orthographic projection of the first exhaust channel 142 on the first insulating member 14 on one side of the first collector 111 can be in contact with the edge of the orthographic projection of the first exhaust channel 142 on the first insulating member 14 on the other side of the first collector 111, but they do not overlap.

[0173] By setting the projections of the first exhaust channels 142 on the first insulating members 14 on opposite sides of the first current collector 111 to not overlap, the first insulating member 14 can have higher strength along the first direction X, reducing the risk of the electrode assembly 1 being damaged when pressing the electrode assembly 1.

[0174] In some embodiments, please refer to Figures 17 and 18. Figure 17 is a structural schematic diagram of the electrode assembly 1 provided in some embodiments of this application; Figure 18 is a partial enlarged view of region F in Figure 17. The second electrode 13 includes a second current collector 131 and a second active material layer 132. Along the first direction X, the second current collector 131 is disposed on the side facing the solid electrolyte layer 12 with the second active material layer 132. The electrode assembly 1 also includes a second insulating member 15, which is disposed around the second active material layer 132. The second insulating member 15 has a second inner peripheral surface 151 facing the second active material layer 132. Along the first direction X, at least a portion of the second insulating member 15 is disposed between the second current collector 131 and the solid electrolyte layer 12. The second insulating member 15 has a second venting channel 152, which communicates with the outside of the electrode assembly 1 and extends to the second inner peripheral surface 151.

[0175] The second active material layer 132 may be provided on only one side of the second current collector 131, and a solid electrolyte layer 12 may be provided on the side of the second active material layer 132 facing away from the second current collector 131; or the second active material layer 132 may be provided on both opposite sides of the second current collector 131, and a solid electrolyte layer 12 may be provided on the side of one second active material layer 132 facing away from the second current collector 131, and a solid electrolyte layer 12 may also be provided on the side of the other second active material layer 132 facing away from the second current collector 131.

[0176] The second insulating member 15 is disposed around the second active material layer 132. The inner peripheral surface of the second insulating member 15 may surround the outer edge of the outer edge of the second active material layer 132, such that the entire second active material layer 132 is located within the inner peripheral surface of the second insulating member 15. Alternatively, the inner peripheral surface of the second insulating member 15 may only surround a portion of the second active material layer 132, with the other portion of the second active material layer 132 located outside the inner peripheral surface of the second insulating member 15; for example, the other portion of the second active material layer 132 may be located between the solid electrolyte layer 12 and the second insulating member 15.

[0177] The second inner peripheral surface 151 of the second insulating member 15 is the surface of the second insulating member 15 facing the second active material layer 132 and surrounding the second active material layer 132. The second inner peripheral surface 151 can be a single surface; for example, the second insulating member 15 may be annular, and the second inner peripheral surface 151 may be the inner surface of the second insulating member 15 facing the second active material layer 132. The second inner peripheral surface 151 can also be a combination of multiple surfaces; for example, the second insulating member 15 may be rectangular annular, and the second insulating member 15 may have four inner surfaces facing the second active material layer 132, and these four inner surfaces constitute the second inner peripheral surface 151. It is understood that the projection of the second inner peripheral surface 151 along the first direction X can be circular, polygonal, etc. The projection shape of the second insulating member 15 along the first direction X can be the same as or different from the second active material layer 132. The second insulating member 15 is made of an insulating material, such as polyimide, polyetheretherketone, polyphenylene sulfide, silicone rubber, etc.

[0178] The second insulating member 15 may be entirely disposed between the second current collector 131 and the solid electrolyte layer 12, or only a portion of the second insulating member 15 may be disposed between the second current collector 131 and the solid electrolyte layer 12. The second insulating member 15 may connect the second current collector 131 and the solid electrolyte layer 12; or it may connect only one of the second current collector 131 and the solid electrolyte layer 12.

[0179] A second exhaust channel 152 is disposed on the second insulating member 15 and extends to the second inner peripheral surface 151, such that one vent of the second exhaust channel 152 can face the second active material layer 132, so that the second exhaust channel 152 can guide the gas in the second active material layer 132 and the gas in the area surrounded by the second inner peripheral surface 151 to the outside of the electrode assembly 1. The second exhaust channel 152 may be disposed in a groove of the second insulating member 15 or a hole penetrating the second insulating member 15. The second exhaust channel 152 can have one vent on its second inner circumferential surface 151, and only one exhaust port on the side of the second insulating member 15 exposed to the electrode assembly 1, allowing gas to enter the vent and exit to the outside of the electrode assembly 1. Alternatively, the second exhaust channel 152 can have one vent on its second inner circumferential surface 151, and multiple exhaust ports on the side of the first insulating member 14 exposed to the electrode assembly 1, allowing gas to enter the vent and exit to the outside of the electrode assembly 1 through the multiple exhaust ports. It is understood that the number of vents and exhaust ports in the same second exhaust channel 152 can be one or multiple. The second exhaust channel 152 can be one or multiple.

[0180] By surrounding the second active material layer 132 with the second insulating member 15, the position of the second active material layer 132 can be restricted, making the second active material layer 132 more stable between the solid electrolyte layer 12 and the second current collector 131. By providing a second venting channel 152 in the second insulating member 15, the second venting channel 152 can discharge the gas in the second active material layer 132, reducing the risk of wrinkling of the second current collector 131 or the second active material layer 132 due to the inability of the gas in the second active material layer 132 to be discharged during the pressing of the electrode assembly 1. In this way, the gas in the first active material layer 112 and the second active material layer 132 can be discharged from the electrode assembly 1, thereby reducing the risk of damage to the electrode assembly 1 and improving the yield of the battery cell 10.

[0181] In some embodiments, the orthographic projection of the first exhaust channel 142 and the orthographic projection of the second exhaust channel 152 do not overlap in a projection plane perpendicular to the first direction X.

[0182] In a projection plane perpendicular to the first direction X, the orthographic projections of the first exhaust channel 142 and the second exhaust channel 152 have no overlapping area. This can be achieved by setting the orthographic projections of the first exhaust channel 142 and the second exhaust channel 152 alternately; alternatively, the edge of the orthographic projection of the first exhaust channel 142 may contact the edge of the orthographic projection of the second exhaust channel 152 without overlapping.

[0183] In this embodiment, the orthographic projection of the first exhaust channel 142 and the orthographic projection of the second exhaust channel 152 do not overlap in the projection plane perpendicular to the first direction X, thereby improving the strength of the first insulating member 14 and the second insulating member 15 along the first direction X and reducing the risk of the electrode assembly 1 being damaged when subjected to pressure along the first direction X.

[0184] In an embodiment where a first insulating member 14 is provided on both sides of the first current collector 111, in a projection plane perpendicular to the first direction X, the orthographic projections of all the first exhaust channels 142 on the first insulating members 14 on both sides of the first current collector 111 do not overlap with the orthographic projections of the second exhaust channels 152.

[0185] In some embodiments, please continue to refer to FIG18. Along the first direction X, the second insulating member 15 has a third surface 154 disposed facing the solid electrolyte layer 12 and a fourth surface 155 disposed facing the second current collector 131. At least one second venting channel 152 is a second venting groove 1521, and the third surface 154 is provided with the second venting groove 1521.

[0186] It is possible that only the third surface 154 of the second insulating member 15 is connected to the solid electrolyte layer 12; it is also possible that only the fourth surface 155 of the second insulating member 15 is connected to the second current collector 131; or it is possible that the third surface 154 of the second insulating member 15 is connected to the solid electrolyte layer 12 and the fourth surface 155 of the second insulating member 15 is connected to the second current collector 131.

[0187] It can be that there is only one second exhaust channel 152 which is a second exhaust groove 1521, the second exhaust groove 1521 is disposed on the third surface 154, the second exhaust groove 1521 extends to the second inner peripheral surface 151 and communicates with the outside of the electrode assembly 1; or it can be that there are multiple second exhaust channels 152 which are all second exhaust grooves 1521, the multiple second exhaust grooves 1521 are all disposed on the third surface 154, each second exhaust groove 1521 extends to the second inner peripheral surface 151 and communicates with the outside of the electrode assembly 1.

[0188] In this embodiment, by providing a second exhaust groove 1521 on the third surface 154, the gas in the second active material layer 132 near the solid electrolyte layer 12 can be discharged from the second exhaust groove 1521, thereby improving the contact tightness between the second active material layer 132 and the solid electrolyte layer 12, promoting ion exchange between the second active material layer 132 and the solid electrolyte layer 12, and improving the electrochemical performance of the electrode assembly 1.

[0189] In some embodiments, along the first direction X, the second insulating member 15 has a third surface 154 facing the solid electrolyte layer 12 and a fourth surface 155 facing the second current collector 131. At least one second venting channel 152 is a second venting groove 1521, and the fourth surface 155 is provided with the second venting groove 1521.

[0190] It can be that there is only one second exhaust channel 152 which is a second exhaust groove 1521. The second exhaust groove 1521 is disposed on the fourth surface 155, extends to the second inner peripheral surface 151, and communicates with the outside of the electrode assembly 1; or it can be that there are multiple second exhaust channels 152 which are all second exhaust grooves 1521. The multiple second exhaust grooves 1521 are all disposed on the fourth surface 155, and each second exhaust groove 1521 extends to the second inner peripheral surface 151 and communicates with the outside of the electrode assembly 1.

[0191] In this embodiment, by providing a second exhaust groove 1521 on the fourth surface 155, the gas in the second active material layer 132 near the second current collector 131 can be more easily discharged through the second exhaust groove 1521, thereby improving the contact tightness between the second active material layer 132 and the second current collector 131, thereby promoting electron exchange between the second active material layer 132 and the second current collector 131, and thus improving the electrochemical performance of the electrode assembly 1.

[0192] In some embodiments, along the first direction X, the second insulating member 15 has a third surface 154 facing the solid electrolyte layer 12 and a fourth surface 155 facing the second current collector 131. A plurality of second venting channels 152 are second venting grooves 1521, and both the third surface 154 and the fourth surface 155 are provided with second venting grooves 1521.

[0193] The third surface 154 may have a second vent groove 1521; the fourth surface 155 may have one or more second vent grooves 1521. Alternatively, the third surface 154 may have multiple second vent grooves 1521; the fourth surface 155 may have only one or more second vent grooves 1521.

[0194] In this embodiment, by providing second exhaust grooves 1521 on both the third surface 154 and the fourth surface 155, the multiple second exhaust grooves 1521 can promote the discharge of gas in the second active material layer 132, thereby promoting the contact between the second active material layer 132 and the second current collector 131 and promoting the contact between the second active material layer 132 and the solid electrolyte layer 12, thereby improving the electrochemical performance of the electrode assembly 1.

[0195] In some embodiments, please continue to refer to FIG18. The second insulating member 15 has a second outer peripheral surface 153 disposed opposite to the second inner peripheral surface 151, and the two ends of the second vent groove 1521 extend to the second inner peripheral surface 151 and the second outer peripheral surface 153, respectively.

[0196] The second exhaust groove 1521 has two ends, one end extending to the second inner peripheral surface 151 and the other end extending to the second outer peripheral surface 153. The projection of the second exhaust groove 1521 along the first direction X can be rectangular, trapezoidal, etc.

[0197] By setting the two ends of the second exhaust groove 1521 to extend to the second inner peripheral surface 151 and the second outer peripheral surface 153, it is beneficial for the gas in the first active material layer 112 to be drawn out of the electrode assembly 1 from the second outer peripheral surface 153, which facilitates the processing of the second exhaust groove 1521 and reduces the processing cost of the second exhaust groove 1521.

[0198] In some embodiments, the third surface 154 is provided with a second venting groove 1521, and in a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the second venting groove 1521 does not overlap with the orthographic projection of the solid electrolyte layer 12.

[0199] In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the second vent groove 1521 does not overlap with the orthographic projection of the solid electrolyte layer 12. That is, a portion of the third surface 154 is exposed in the solid electrolyte layer 12, and a portion of the second vent groove 1521 is located in that portion of the third surface 154, so that a portion of the second vent groove 1521 is exposed in the solid electrolyte layer 12, thereby enabling the second vent groove 1521 to communicate with the outside of the electrode assembly 1. Alternatively, the second vent groove 1521 may penetrate through the second inner peripheral surface 151 and the second outer peripheral surface 153; or one end of the second vent groove 1521 may extend to the second inner peripheral surface 151, and the other end may extend to the portion of the third surface 154 exposed in the solid electrolyte layer 12, thereby enabling the second vent groove 1521 to communicate with the outside of the electrode assembly 1. It is understood that, in the projection plane perpendicular to the first direction X, a portion of the orthographic projection of the second exhaust groove 1521 does not overlap with the orthographic projection of the solid electrolyte layer 12, and the solid electrolyte layer 12 covers this portion of the second exhaust groove 1521; another portion of the orthographic projection of the second exhaust groove 1521 overlaps with the orthographic projection of the solid electrolyte layer 12, and this portion of the second exhaust groove 1521 is exposed in the solid electrolyte layer 12.

[0200] In this embodiment, the gas in the second exhaust groove 1521 is discharged from the third surface 154, making it easier for the gas in the second active material layer 132 to be discharged from the second exhaust groove 1521, and making the second exhaust channel 152 more convenient.

[0201] In some embodiments, the fourth surface 155 is provided with a second exhaust groove 1521, and in a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the second exhaust groove 1521 does not overlap with the orthographic projection of the second current collector 131.

[0202] In a projection plane perpendicular to the first direction X, a portion of the orthographic projection of the second vent groove 1521 does not overlap with the orthographic projection of the second current collector 131. That is, a portion of the fourth surface 155 is exposed in the second current collector 131, and a portion of the second vent groove 1521 is located in that portion of the fourth surface 155, so that a portion of the second vent groove 1521 is exposed in the second current collector 131, thereby enabling the second vent groove 1521 to communicate with the outside of the electrode assembly 1. Alternatively, the second vent groove 1521 may penetrate through the second inner peripheral surface 151 and the second outer peripheral surface 153; or one end of the second vent groove 1521 may extend to the second inner peripheral surface 151, and the other end may extend to the portion of the fourth surface 155 exposed in the second current collector 131, thereby enabling the second vent groove 1521 to communicate with the outside of the electrode assembly 1.

[0203] In this embodiment, the gas in the second exhaust groove 1521 is discharged from the fourth surface 155, making it easier for the gas in the second active material layer 132 to be discharged from the second exhaust groove 1521, and making the second exhaust channel 152 more convenient.

[0204] In some embodiments, please continue to refer to Figures 5 and 6. The first insulating member 14 connects the first current collector 111 and the solid electrolyte layer 12. The first current collector 111, the first insulating member 14, and the solid electrolyte layer 12 together define a first accommodating space 16. The first accommodating space 16 communicates with the outside of the electrode assembly 1 through a first exhaust channel 142.

[0205] The first insulating element 14 can be bonded or abutted against the first current collector 111; the first insulating element 14 can be bonded or abutted against the solid electrolyte layer 12. There can be one first exhaust channel 142, and the first receiving space 16 can be connected to the outside of the electrode assembly 1 through one first exhaust channel 142; there can also be multiple first exhaust channels 142, and the first receiving space 16 can be connected to the outside of the electrode assembly 1 through multiple first exhaust channels 142.

[0206] The first containment space 16 is defined by the first current collector 111, the first insulating element 14, and the solid electrolyte layer 12. The first containment space 16 can restrict the position of the first active material layer 112, thereby reducing the risk of the first active material layer 112 detaching from the electrode assembly 1. The gas in the first containment space 16 can be discharged from the first exhaust channel 142, which helps to reduce the volume in the first containment space 16, thereby reducing the volume of the electrode assembly 1, increasing the volumetric energy density of the electrode assembly 1, and also making the contact between the first active material layer 112 and the solid electrolyte layer 12 and between the first active material layer 112 and the first current collector 111 more compact, thereby improving the electrochemical performance of the electrode assembly 1.

[0207] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0208] This application provides an electrical device, including a battery cell 10 or a battery device 100 provided in any of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0209] Please refer to Figures 4-6. This application provides a battery cell 10, including a housing 2 and an electrode assembly 1. The electrode assembly 1 is housed within the housing 2 and includes a first electrode 11, a solid electrolyte layer 12, and a second electrode 13 stacked together. The first electrode 11 and the second electrode 13 have opposite polarities. At least a portion of the solid electrolyte layer 12 is disposed between the first electrode 11 and the second electrode 13 along a first direction X. The first electrode 11 includes a first current collector 111 and a first active material layer 112. Along the first direction X, the first active material layer 112 is disposed on the side of the first current collector 111 facing the solid electrolyte layer 12. The electrode assembly 1 further includes a first insulating member 14, which surrounds the first active material layer 112. The first insulating member 14 has a first inner peripheral surface 141 facing the first active material layer 112 and a first outer peripheral surface 143 opposite to the first inner peripheral surface 141. Along the first direction X, the first insulating member 14 connects the first current collector 111 and the solid electrolyte layer 12. The first insulating member 14 also has a first surface 144 facing the solid electrolyte layer 12. The first surface 144 is provided with a first exhaust channel 142. The two ends of the first exhaust channel 142 penetrate the first inner peripheral surface 141 and the first outer peripheral surface 143, so that the first exhaust channel 142 communicates with the outside of the electrode assembly 1.

[0210] By surrounding the first active material layer 112 with the first insulating member 14, the position of the first active material layer 112 can be restricted, making the first active material layer 112 more stable between the solid electrolyte layer 12 and the first current collector 111. By providing a first venting channel 142 in the first insulating member 14, the first venting channel 142 can discharge the gas inside the first active material layer 112, reducing the risk of wrinkling of the first current collector 111 or the first active material layer 112 due to the inability of the gas in the first active material layer 112 to be discharged during the pressing of the electrode assembly 1, thereby reducing the risk of damage to the electrode assembly 1 and improving the yield of the battery cell 10.

[0211] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single battery cell, comprising: shell; An electrode assembly is housed within the housing. The electrode assembly includes a first electrode, a solid electrolyte layer, and a second electrode stacked together. The first electrode and the second electrode have opposite polarities. At least a portion of the solid electrolyte layer is disposed between the first electrode and the second electrode along a first direction. The first electrode includes a first current collector and a first active material layer. Along the first direction, the first active material layer is disposed on the side of the first current collector facing the solid electrolyte layer. The electrode assembly further includes a first insulating member, which is disposed around the first active material layer. The first insulating member has a first inner peripheral surface facing the first active material layer. Along the first direction, at least a portion of the first insulating member is disposed between the first current collector and the solid electrolyte layer. The first insulating member is provided with a first exhaust channel, which communicates with the external space of the electrode assembly and extends to the first inner peripheral surface.

2. The battery cell as described in claim 1, wherein, Along the first direction, the first insulating member has a first surface facing the solid electrolyte layer and a second surface facing the first current collector; At least one of the first exhaust channels is a first exhaust groove, and the first surface and / or the second surface is provided with the first exhaust groove.

3. The battery cell as described in claim 2, wherein, The first insulating member has a first outer peripheral surface disposed opposite to the first inner peripheral surface, and the two ends of the first exhaust groove extend to the first inner peripheral surface and the first outer peripheral surface, respectively.

4. The battery cell as described in claim 2 or 3, wherein, The first surface is provided with the first exhaust groove, and in the projection plane perpendicular to the first direction, a portion of the orthographic projection of the first exhaust groove does not overlap with the orthographic projection of the solid electrolyte layer.

5. The battery cell according to any one of claims 2-4, wherein, The second surface is provided with the first exhaust groove, and in the projection plane perpendicular to the first direction, a portion of the orthographic projection of the first exhaust groove does not overlap with the orthographic projection of the first current collector.

6. The battery cell according to any one of claims 2-5, wherein, The width of the first exhaust groove is 0.1mm-30mm.

7. The battery cell according to any one of claims 2-6, wherein, The depth of the first exhaust groove is 2μm-100μm.

8. The battery cell according to any one of claims 1-7, wherein, The first insulating member includes multiple sides, which are connected end to end to form a ring structure, and at least one side is provided with the first exhaust channel.

9. The battery cell as described in claim 8, wherein, Each of the aforementioned edges is provided with the first exhaust channel.

10. The battery cell as described in claim 8 or 9, wherein, In the side portion where the first exhaust channel is provided, the length of the side portion is L1, and the total width of the first exhaust channel along the extension direction of the side portion is L2, where 0.01≤L2 / L1≤0.

2.

11. The battery cell according to any one of claims 1-10, wherein, The first insulating member is provided with a plurality of first exhaust channels, which are spaced apart along the circumference of the first insulating member. The total width of the plurality of first exhaust channels along the circumference of the first insulating member is L3, and the circumference of the first inner circumferential surface is L4, where 0.01≤L3 / L4≤0.

2.

12. The battery cell according to any one of claims 1-11, wherein, Along the first direction, the first active material layer is provided on both sides of the first current collector, and each first active material layer is provided with the first insulating element. In a projection plane perpendicular to the first direction, the orthographic projection of the first exhaust channel on the first insulating member located on one side of the first current collector does not overlap with the orthographic projection of the first exhaust channel on the first insulating member located on the other side of the first current collector.

13. The battery cell according to any one of claims 1-12, wherein, The second electrode includes a second current collector and a second active material layer. Along the first direction, the second active material layer is disposed on the side of the second current collector facing the solid electrolyte layer. The electrode assembly further includes a second insulating member, which is disposed around the second active material layer. The second insulating member has a second inner peripheral surface facing the second active material layer. Along the first direction, at least a portion of the second insulating member is disposed between the second current collector and the solid electrolyte layer. The second insulating member is provided with a second exhaust channel, which communicates with the external space of the electrode assembly and extends to the second inner peripheral surface.

14. The battery cell as described in claim 13, wherein, In a projection plane perpendicular to the first direction, the orthographic projection of the first exhaust channel does not overlap with the orthographic projection of the second exhaust channel.

15. The battery cell as described in claim 13 or 14, wherein, Along the first direction, the second insulating member has a third surface facing the solid electrolyte layer and a fourth surface facing the second current collector; At least one of the second exhaust channels is a second exhaust groove, and the third surface and / or the fourth surface is provided with the second exhaust groove.

16. The battery cell as described in claim 15, wherein, The second insulating member has a second outer peripheral surface disposed opposite to the second inner peripheral surface, and the two ends of the second exhaust groove extend to the second inner peripheral surface and the second outer peripheral surface, respectively.

17. The battery cell as described in claim 15 or 16, wherein, The third surface is provided with the second exhaust groove, and in the projection plane perpendicular to the first direction, a portion of the orthographic projection of the second exhaust groove does not overlap with the orthographic projection of the solid electrolyte layer.

18. The battery cell according to any one of claims 15-17, wherein, The fourth surface is provided with the second exhaust groove, and in the projection plane perpendicular to the first direction, a portion of the orthographic projection of the second exhaust groove does not overlap with the orthographic projection of the second current collector.

19. The battery cell according to any one of claims 1-18, wherein, The first insulating element connects the first current collector and the solid electrolyte layer. The first current collector, the first insulating element, and the solid electrolyte layer together define a first accommodating space. The first accommodating space communicates with the external space of the electrode assembly through the first exhaust channel.

20. A battery device comprising a battery cell as described in any one of claims 1-19.

21. An electrical device comprising a battery cell as described in any one of claims 1-19 or a battery device as described in claim 20, wherein the battery cell is used to provide electrical energy to the electrical device.

Images