Battery cell, battery device, electric device, and electrode assembly

Abstract

The utility model discloses a battery monomer, a battery device, a power utilization device and an electrode assembly, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell, and the electrode assembly comprises a first pole piece, a second pole piece, a solid electrolyte layer and an insulating part. The first pole piece comprises a first active material area and a first tab, and the first tab protrudes out of the first active material area. The polarity of the second pole piece is opposite to that of the first pole piece, the second pole piece comprises a main body area and an exceeding area exceeding the first active material area, and the main body area and the first active material area are stacked in the first direction. At least part of the solid electrolyte layer is arranged between the first pole piece and the second pole piece in the first direction. The insulator is disposed in an edge region of the first active material region, and the insulator is configured to insulate and isolate the exceeding region from the first active material region. The risk that the exceeding area is overlapped with the first active material area is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the demand for batteries increases, higher requirements are placed on the reliability of battery cells. Therefore, how to improve the reliability of battery cells is an urgent problem to be solved in battery technology. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery device, an electrical device and an electrode assembly, which can effectively improve the reliability of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell and an electrode assembly, wherein the electrode assembly is accommodated in the shell; the electrode assembly comprises a first pole piece, a second pole piece, a solid electrolyte layer and an insulating member; the first pole piece comprises a first active material region and a first pole ear, and the first pole ear protrudes from the first active material region; the second pole piece has an opposite polarity to the first pole piece, and the second pole piece comprises a main body region and an excess region exceeding the first active material region, and the main body region and the first active material region are stacked along a first direction; along the first direction, at least a portion of the solid electrolyte layer is arranged between the first pole piece and the second pole piece; the insulating member is arranged in the edge area of the first active material region, and the insulating member is configured to insulate and isolate the excess region and the first active material region.

[0005] In the above technical solution, an insulating member is provided in the edge area of the first active material area, which can insulate and isolate the protruding area of the second pole piece from the first active material area of the first pole piece, thereby reducing the risk of overlapping of the protruding area with the first active material area, thereby reducing the risk of short circuit between the first pole piece and the second pole piece, and improving the reliability of the battery cell.

[0006] In some embodiments, along the first direction, the first active material region has a first surface facing the main body region, at least part of the overrun region is located on the side of the first surface away from the main body region, and at least part of the insulating member is located between the overrun region and the first active material region. At least part of the overrun region is located on the side of the first surface away from the main body region, so that the overrun region plays a certain protective role on the first active material region, reducing the risk of damage to the first active material region. At least part of the insulating member is located between the overrun region and the first active material region, which can effectively reduce the risk of overlap between the overrun region and the first active material region.

[0007] In some embodiments, the solid electrolyte layer includes a first part and a second part, and along the first direction, the first part and the second part are staggered, the first part is arranged between the main body area and the first active material area, and the second part is arranged in a stacked manner with the excess area; along the first direction, the first active material area has a first surface facing the main body area, at least part of the second part is located on the side of the first surface away from the main body area, and at least part of the insulating member is located between the second part and the first active material area. The second part of the solid electrolyte layer is stacked with the excess area, and the solid electrolyte layer can cover a part of the surface of the excess area, reducing the risk of overlap between the excess area and the first active material area. At least part of the second part is located on the side of the first surface away from the main body area, and at least part of the insulating member is located between the second part and the first active material area, so that the insulating member can cover more areas of the side surface of the first active material area connected to the first surface, reducing the risk of overlap between the side surface of the excess area and the first active material area.

[0008] In some embodiments, along the first direction, at least a portion of the insulating member is located between the first active material region and the main body region. The portion of the insulating member located between the first active material region and the main body region can separate the first active material region from the main body region, reducing the risk of overlapping the edge region of the first active material region with the main body region.

[0009] In some embodiments, along the first direction, the portion of the insulating member located between the first active material region and the main body region is connected to the side of the first active material region facing the main body region, so that the insulating member is connected to the first active material region, the firmness of the insulating member is improved, and the risk of the insulating member being detached is reduced.

[0010] In some embodiments, at least one end of the main body region along the second direction is provided with a protruding region, and an insulating member is provided at the end of the first active material region along the second direction close to the protruding region, and the second direction is perpendicular to the first direction. This can reduce the risk of the protruding region in the second direction overlapping with the first active material region, thereby reducing the risk of short circuit between the first pole piece and the second pole piece.

[0011] In some embodiments, along a first direction, second electrode tabs are disposed on both sides of the first electrode tab; two insulating members are disposed at an end of the first active material region close to the extended region along a second direction. The insulating member disposed at at least one end of the first active material region along the second direction includes a first insulating portion, a second insulating portion, and a third insulating portion connected in sequence; along the first direction, at least a portion of the first insulating portion is disposed between the first active material region and the main body region, and at least a portion of the third insulating portion is disposed between the extended regions of two adjacent second electrode tabs; along the second direction, at least a portion of the second insulating portion is disposed between the first active material region and the extended region. By disposing two insulating members at an end of the first active material region close to the extended region along the second direction, insulation isolation can be achieved between the extended regions of the second electrode tabs on both sides of the first electrode tab and the first active material region of the first electrode tab in the second direction, and the extended regions of two adjacent second electrode tabs can be separated in the second direction, reducing the risk of mutual influence between the extended regions. The insulating member of this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least a portion of the second insulating portion of the insulating member is disposed between the first active material region and the extended region along the second direction, the second insulating portion can not only separate the first active material region and the extended region, but also separate the risk of burrs generated during the forming of the end of the first active material region along the second direction from contacting the extended region, thereby reducing the risk of short circuit between the first electrode tab and the second electrode tab.

[0012] In some embodiments, along the first direction, the first insulating portions of the two insulating members are respectively connected to opposite sides of the first active material region. Connecting the first insulating portions of the two insulating members to opposite sides of the first active material region respectively improves the firmness of the insulating member and reduces the risk of the insulating member detaching. During the preparation of the electrode assembly, the first insulating portions of the two insulating members can be respectively connected to opposite sides of the first active material region first. After fixing the two insulating members at the end of the first active material region along the second direction, the first electrode tab, the solid electrolyte layer, and the second electrode tab are laminated, which can effectively reduce the installation difficulty of the insulating member.

[0013] In some embodiments, the third insulating portions of the two insulating members disposed at at least one end of the first active material region along the second direction are connected to each other. The two insulating members form an integral body to hold the second insulating portions of the two insulating members between the first active material region and the extended region. The cooperation of the two insulating members can cover more regions of the end face of the first active material region in the second direction, reducing the risk of the extended region overlapping with the end face of the first active material region.

[0014] In some embodiments, along the second direction, at least one end of the first active material region is provided with a first pole ear; in the insulating member provided at the end of the first active material region close to the first pole ear along the second direction, along the first direction, at least a portion of the third insulating portion is located between the first pole ear and the excess region. The third insulating portion can separate the first pole ear from the excess region, reducing the risk of the excess region overlapping the first pole ear and causing a short circuit between the first pole piece and the second pole piece.

[0015] In some embodiments, along the second direction, the third insulating portion exceeds the end of the exceeding region away from the main region, so that the size of the third insulating portion along the second direction is larger, the insulating range of the third insulating portion in the second direction is increased, and the insulating capacity of the third insulating portion is enhanced.

[0016] In some embodiments, along the first direction, a second pole piece is disposed on both sides of the first pole piece; the insulating member disposed at least one end of the first active material region along the second direction includes a second insulating portion and two first insulating portions, and the second insulating portion connects the two first insulating portions; along the first direction, at least a portion of a first insulating portion is disposed between the first active material region and the main body region of a second pole piece, and at least a portion of another first insulating portion is disposed between the first active material region and the main body region of another second pole piece; along the second direction, at least a portion of the second insulating portion is disposed between the first active material region and the excess region. The insulating member of this structure can achieve the insulation isolation of the second pole piece located on both sides of the first pole piece in the second direction excess region and the first active material region of the first pole piece, and the structure is simple, reducing the material used for the insulating member. In addition, since at least a portion of the second insulating portion of the insulating member is disposed between the first active material region and the excess region along the second direction, the second insulating portion can not only separate the first active material region and the excess region, but also separate the risk of the burrs generated at the end of the first active material region along the second direction during molding and contacting the excess region, thereby reducing the risk of short circuit between the first pole piece and the second pole piece.

[0017] In some embodiments, along the first direction, the two first insulating parts are respectively connected to the opposite sides of the first active material area. The two first insulating parts are respectively connected to the opposite sides of the first active material area, which improves the firmness of the insulating part and reduces the risk of the insulating part detaching. In the process of preparing the electrode assembly, the two first insulating parts of the insulating part can be respectively connected to the opposite sides of the first active material area, and after the insulating part is fixed to the end of the first active material area along the second direction, the first pole piece, the solid electrolyte layer and the second pole piece are stacked, which can effectively reduce the difficulty of installing the insulating part.

[0018] In some embodiments, the dimension of the first insulating portion in the second direction is L1, where 0.1 mm ≤ L1 ≤ 10 mm. L1 ≥ 0.1 mm enables the first insulating portion to have sufficient dimension in the second direction, which is beneficial to enhancing the firmness of the insulating member and reducing the risk of the insulating member detaching; L1 ≤ 10 mm ensures that the dimension of the first insulating portion in the second direction is not too large. On the one hand, it reduces the influence of the first insulating portion on the transport of active ions between the first electrode plate and the second electrode plate, and on the other hand, it reduces the material consumption of the first insulating portion, resulting in better economy.

[0019] In some embodiments, 2 mm ≤ L1 ≤ 8 mm. This further takes into account both the firmness and economy of the insulating member.

[0020] In some embodiments, extended regions are provided at both opposite ends of the main body region in the second direction, and insulating members are provided at both opposite ends of the first active material region in the second direction. This can reduce the risk of the two extended regions of the second electrode plate in the second direction overlapping with the first active material region, thereby reducing the risk of short circuit between the first electrode plate and the second electrode plate.

[0021] In some embodiments, an extended region is provided at at least one end of the main body region in the third direction, and an insulating member is provided at the end of the first active material region close to the extended region in the third direction. The first direction and the second direction are both perpendicular to the third direction. This can reduce the risk of the extended region in the third direction overlapping with the first active material region, thereby reducing the risk of short circuit between the first electrode plate and the second electrode plate.

[0022] In some embodiments, along the first direction, a second pole piece is disposed on both sides of the first pole piece; two insulating members are disposed at the end of the first active material region close to the excess region along the third direction, and the insulating member disposed at at least one end of the first active material region along the third direction includes a fourth insulating portion, a fifth insulating portion, and a sixth insulating portion connected in sequence; along the first direction, at least part of the fourth insulating portion is disposed between the first active material region and the main region, and at least part of the sixth insulating portion is disposed between the excess regions of two adjacent second pole pieces; along the third direction, at least part of the fifth insulating portion is disposed between the first active material region and the excess region. By disposing two insulating members at the end of the first active material region close to the excess region along the third direction, the excess region of the second pole piece located on both sides of the first pole piece in the third direction can be insulated and isolated from the first active material region of the first pole piece, and the excess regions of the two adjacent second pole pieces in the third direction can be separated, reducing the risk of mutual influence of the excess regions. The insulating member of this structure has lower requirements on dimensional accuracy and higher installation efficiency. In addition, since at least part of the fifth insulating portion of the insulating member is arranged between the first active material area and the excess area along the third direction, the fifth insulating portion can not only separate the first active material area and the excess area, but also separate the risk of burrs generated at the end of the first active material area along the third direction during molding from contacting the excess area, thereby reducing the risk of short circuit between the first pole piece and the second pole piece.

[0023] In some embodiments, along the first direction, the fourth insulating parts of the two insulating parts are respectively connected to the opposite sides of the first active material area. The two insulating parts are respectively connected to the opposite sides of the first active material area, which improves the firmness of the insulating parts and reduces the risk of the insulating parts detaching. In the process of preparing the electrode assembly, the fourth insulating parts of the two insulating parts can be respectively connected to the opposite sides of the first active material area, and after the two insulating parts are fixed at the ends of the first active material area along the third direction, the first pole piece, the solid electrolyte layer and the second pole piece are stacked, which can effectively reduce the difficulty of installing the insulating parts.

[0024] In some embodiments, the sixth insulating parts of the two insulating members disposed at at least one end of the first active material region along the third direction are connected to each other, so that the two insulating members form a whole, so as to keep the fifth insulating parts of the two insulating members between the first active material region and the exceeding region, and the two insulating members cooperate to cover more areas of the end surface of the first active material region in the third direction, thereby reducing the risk of overlapping the end surface of the exceeding region with the first active material region.

[0025] In some embodiments, along the third direction, the sixth insulating portion exceeds one end of the exceeding region away from the main region, so that the size of the sixth insulating portion along the third direction is larger, the insulating range of the sixth insulating portion in the third direction is increased, and the insulating capacity of the sixth insulating portion is enhanced.

[0026] In some embodiments, second electrode tabs are disposed on both sides of the first electrode tab along the first direction; the insulating member disposed at at least one end of the first active material region along the third direction includes a fifth insulating portion and two fourth insulating portions, and the fifth insulating portion connects the two fourth insulating portions; along the first direction, at least a part of one fourth insulating portion is disposed between the first active material region and the main body region of one second electrode tab, and at least a part of the other fourth insulating portion is disposed between the first active material region and the main body region of the other second electrode tab; along the third direction, at least a part of the fifth insulating portion is disposed between the first active material region and the extended region. The insulating member with such a structure can achieve insulating isolation between the extended regions of the second electrode tabs on both sides of the first electrode tab and the first active material region of the first electrode tab, with a simple structure and reduced material usage of the insulating member. In addition, since at least a part of the fifth insulating portion of the insulating member is disposed between the first active material region and the extended region along the third direction, the fifth insulating portion can not only separate the first active material region and the extended region, but also separate the risk of burrs generated at the end of the first active material region along the third direction from contacting the extended region, thereby reducing the risk of short circuit between the first electrode tab and the second electrode tab.

[0027] In some embodiments, the two fourth insulating portions are respectively connected to opposite sides of the first active material region along the first direction. The two fourth insulating portions being respectively connected to opposite sides of the first active material region improves the firmness of the insulating member and reduces the risk of the insulating member detaching. During the preparation of the electrode assembly, the two fourth insulating portions of the insulating member can be respectively connected to opposite sides of the first active material region first. After fixing the insulating member at the end of the first active material region along the third direction, the first electrode tab, the solid electrolyte layer, and the second electrode tab are laminated, which can effectively reduce the installation difficulty of the insulating member.

[0028] In some embodiments, the dimension of the fourth insulating portion along the third direction is L2, where 0.1 mm ≤ L2 ≤ 10 mm. L2 ≥ 0.1 mm enables the fourth insulating portion to have sufficient dimension along the third direction, which is beneficial to enhancing the firmness of the insulating member and reducing the risk of the insulating member detaching; L2 ≤ 10 mm ensures that the dimension of the fourth insulating portion along the third direction is not too large. On the one hand, it reduces the influence of the first insulating portion on the transport of active ions between the first electrode tab and the second electrode tab, and on the other hand, it reduces the material usage of the first insulating portion, having better economy.

[0029] In some embodiments, 2 mm ≤ L2 ≤ 8 mm. This further balances the firmness and economy of the insulating member.

[0030] In some embodiments, both opposite ends of the main body region in the third direction are provided with extending regions, and insulating members are provided at both opposite ends of the first active material region in the third direction. This can reduce the risk of the two extending regions of the second electrode tab overlapping with the first active material region in the third direction, thereby reducing the risk of short circuit between the first electrode tab and the second electrode tab.

[0031] In some embodiments, the first electrode tab is a positive electrode tab and the second electrode tab is a negative electrode tab. The negative electrode tab has an extending region that extends beyond the positive electrode tab, and metal ions (such as lithium ions) released by the positive electrode tab during charging can be more readily received by the negative electrode tab, effectively improving the performance of the battery cell.

[0032] In some embodiments, the insulating member is a polymer material film layer. The polymer material film layer not only has good insulating properties but also has good strength and ductility.

[0033] In some embodiments, the insulating member includes at least one of polypropylene, polyolefin, ethylene vinyl acetate copolymer, epoxy resin adhesive, silicone rubber, polyurethane, and polyethylene terephthalate.

[0034] In a second aspect, an embodiment of the present application provides a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0035] In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in any one of the embodiments of the first aspect or the battery device provided in any one of the embodiments of the second aspect, and the battery cell is used to provide electrical energy.

[0036] In a fourth aspect, an embodiment of the present application provides an electrode assembly, including a first electrode tab, a second electrode tab, a solid electrolyte layer, and an insulating member; the first electrode tab includes a first active material region and a first tab, and the first tab protrudes from the first active material region; the second electrode tab has a polarity opposite to that of the first electrode tab, the second electrode tab includes a main body region and an extending region that extends beyond the first active material region, and the main body region and the first active material region are stacked along a first direction; along the first direction, at least a part of the solid electrolyte layer is disposed between the first electrode tab and the second electrode tab; the insulating member is disposed in the edge region of the first active material region, and the insulating member is configured to insulate and isolate the extending region and the first active material region.

[0037] In the above technical solution, an insulating member is disposed in the edge region of the first active material region, and the insulating member can insulate and isolate the extending region of the second electrode tab from the first active material region of the first electrode tab, reducing the risk of the extending region overlapping with the first active material region, and further reducing the risk of short circuit between the first electrode tab and the second electrode tab. Description of the Drawings

[0038] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0040] Figure 2 Explosion view of a battery device provided by some embodiments of the present application;

[0041] Figure 3 Explosion view of a battery cell provided by some embodiments of the present application;

[0042] Figure 4 For Figure 3 Isometric view of the battery cell shown;

[0043] Figure 5 For Figure 4 A - A sectional view of the battery cell shown;

[0044] Figure 6 Schematic structural diagram of an electrode assembly provided by some embodiments of the present application;

[0045] Figure 7 Schematic structural diagram of a first electrode tab provided by some embodiments of the present application;

[0046] Figure 8 Schematic structural diagram of a second electrode tab provided by some embodiments of the present application;

[0047] Figure 9 For Figure 6 Partial enlarged view at B in

[0048] Figure 10 For Figure 6 Partial enlarged view at C in

[0049] Figure 11 For Figure 9 Schematic structural diagram of the insulating member shown;

[0050] Figure 12 Schematic structural diagram of an electrode assembly provided by other embodiments of the present application;

[0051] Figure 13 For Figure 12 Partial enlarged view at D in

[0052] Figure 14 For Figure 13Schematic structural diagram of the insulating part shown

[0053] Figure 15 Schematic structural diagram of the electrode assembly provided in some other embodiments of the present application

[0054] Figure 16 is Figure 15 Schematic structural diagram of the location E in

[0055] Figure 17 Schematic structural diagram of the electrode assembly provided in some other embodiments of the present application

[0056] Figure 18 is Figure 17 Schematic structural diagram of the location F in

[0057] Figure 19 Flowchart of the preparation method of the electrode assembly provided in some embodiments of the present application

[0058] Reference numerals: 1 - housing; 11 - casing; 12 - end cap; 2 - electrode assembly; 21 - tab; 22 - first electrode tab; 221 - first active material area; 2211 - first surface; 222 - first tab; 223 - first active material layer; 224 - first current collector; 23 - second electrode tab; 231 - main body area; 232 - extended area; 233 - second active material layer; 234 - second current collector; 235 - second tab; 24 - solid electrolyte layer; 241 - first part; 242 - second part; 25 - insulating part; 251 - first insulating portion; 252 - second insulating portion; 253 - third insulating portion; 254 - fourth insulating portion; 255 - fifth insulating portion; 256 - sixth insulating portion; 3 - electrode terminal; 10 - battery cell; 20 - box body; 201 - first box body; 202 - second box body; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle; Z - first direction; Y - second direction; X - third direction. Detailed embodiments

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present application fall within the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0061] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0062] The term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0063] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0064] The term "a plurality of" as used in this application refers to two or more (including two).

[0065] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used through charging after discharging.

[0066] The battery cell includes, but is 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.

[0067] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0068] In some embodiments, the positive electrode may be a positive electrode tab, and the positive electrode tab may include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0069] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0070] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as 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.).

[0071] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which may also be abbreviated as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (which may also be abbreviated as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (which may also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn0.2 O2 (which can also be abbreviated as NCM 622 )、LiNi 0.7 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 711 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 )、lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0072] In some embodiments, the positive electrode can use a foam metal. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled and / or deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0073] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can use a metal foil, a foam metal or a composite current collector. For example, as the metal foil, 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. can be used. The foam metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0075] As an example, the negative electrode plate can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material can be the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material can 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. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0078] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0079] In some embodiments, the separator is a solid electrolyte layer. The solid electrolyte layer is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0080] Among them, the solid electrolyte layer includes polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0081] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0082] As an example, the inorganic solid electrolyte can include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0083] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0084] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive electrode tabs and negative electrode tabs.

[0085] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0086] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc.

[0087] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0088] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0089] As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0090] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0091] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0092] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0093] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0094] As an example, the box body can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0095] As an example, the box body can be a part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0096] In some embodiments, the battery device refers to an energy storage device, which includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0097] In a solid-state battery cell, the electrode assembly generally includes a first electrode sheet, a second electrode sheet, and a solid electrolyte layer. The solid electrolyte layer is disposed between the first electrode sheet and the second electrode sheet. The second electrode sheet has a polarity opposite to that of the first electrode sheet. The first electrode sheet has a first active material region covered with an active material layer, and a part of the second electrode sheet extends beyond the first active material region of the first electrode sheet to form an extending region. During the forming process of the electrode assembly, generally a relatively low pressure is used to hot-press the first electrode sheet, the second electrode sheet, and the solid electrolyte layer together. In this way, it is difficult to closely bond the electrode sheet and the solid electrolyte layer, the interface impedance between the electrode sheet and the solid electrolyte layer is relatively large, and the energy density is relatively low.

[0098] A higher pressure can be used to hot-press the first electrode sheet, the solid electrolyte layer, and the second electrode sheet, so that the electrode sheet and the solid electrolyte layer can be closely bonded, achieving the purpose of reducing the interface impedance and increasing the energy density. However, since a part of the second electrode sheet extends beyond the first electrode sheet to form an extending region, the extending region is prone to bending under high pressure or being cut off under the shearing action at the edge of the first electrode sheet, resulting in the overlapping of the extending part of the second electrode sheet and the edge region of the first electrode sheet, causing a short circuit between the first electrode sheet and the second electrode sheet, and affecting the reliability of the battery cell.

[0099] In view of this, the embodiments of the present application provide a technical solution. By providing an insulating member in the edge region of the first electrode sheet, the insulating member insulates and isolates the extending region of the second electrode sheet from the first active material region of the first electrode sheet, reducing the risk of overlapping between the extending region and the first active material region, thereby reducing the risk of short circuit between the first electrode sheet and the second electrode sheet, and improving the reliability of the battery cell.

[0100] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0101] For the convenience of description, the following embodiments take the electrical device as a vehicle as an example for description.

[0102] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for supplying power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000.

[0103] The vehicle 1000 may further 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, it is used for the power demand during the startup, navigation, and driving of the vehicle 1000.

[0104] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0105] Please refer to Figure 2 , Figure 2 FIG. is an exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 may include battery cells 10 and a box body 20. The box body 20 is used to accommodate the battery cells 10.

[0106] Among them, a closed space for accommodating the battery cells 10 is formed inside the box body 20, and the box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first box body 201 and a second box body 202, and the first box body 201 and the second box body 202 are buckled with each other. The first box body 201 and the second box body 202 can be of various shapes, such as a cuboid, a cylinder, etc. The first box body 201 may be a hollow structure with one side open, and the second box body 202 may also be a hollow structure with one side open. The open side of the second box body 202 and the open side of the first box body 201 are buckled with each other, thus forming the box body 20 with a closed space. It can also be that the first box body 201 is a hollow structure with one side open, and the second box body 202 is a plate-like structure. The second box body 202 is buckled on the open side of the first box body 201, thus forming the box body 20 with an accommodating space.

[0107] In the battery device 100, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10. It can be that multiple battery cells 10 are first connected in series, parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 20. It can also be that all the battery cells 10 are directly connected in series, parallel, or in a mixed connection together, and then the whole formed by all the battery cells 10 is accommodated in the box body 20.

[0108] Please refer to Figures 3 - 5 , Figure 3 FIG. is an exploded view of the battery cell 10 provided in some embodiments of the present application; Figure 4 is Figure 3 the isometric view of the battery cell 10 shown in Figure 5 is Figure 4Cross-sectional view of battery cell 10 taken along line A-A as shown. The battery cell 10 may include a housing 1 and an electrode assembly 2, and the electrode assembly 2 is accommodated within the housing 1.

[0109] In some embodiments, the housing 1 may include a casing 11 and an end cap 12. The casing 11 has an opening, and the end cap 12 closes the opening of the casing 11. Here, "closes" means covering or shutting, which may be a seal or non-seal.

[0110] The casing 11 is a component for accommodating the electrode assembly 2. The casing 11 may be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The casing 11 may be of various shapes, such as cylindrical, cuboid, etc. The material of the casing 11 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 2 may be partially located within the casing 11 or entirely located within the casing 11.

[0111] The end cap 12 and the casing 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 12 may be connected to the casing 11 by welding, crimping, etc. to close the opening of the casing 11. The shape of the end cap 12 may be adapted to the shape of the casing 11. For example, if the casing 11 is a cuboid structure, the end cap 12 is a rectangular plate-like structure adapted to the casing 11. Another example is that if the casing 11 is a cylindrical structure, the end cap 12 is a circular plate-like structure adapted to the casing 11. The material of the end cap 12 may also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 12 and the casing 11 may be the same or different.

[0112] In an embodiment where the casing 11 has an opening formed at one end, one end cap 12 may be correspondingly provided. In an embodiment where the casing 11 has openings formed at opposite ends, two end caps 12 may be correspondingly provided. The two end caps 12 respectively close the two openings of the casing 11, and the two end caps 12 and the casing 11 together define a receiving space.

[0113] In some embodiments, the battery cell 10 may further include an electrode terminal 3. The electrode terminal 3 is provided on the housing 1 and is used for electrically connecting with the tab 21 of the electrode assembly 2 to input or output the electrical energy of the battery cell 10. The electrode terminal 3 may be provided on the casing 11 of the housing 1 or on the end cap 12 of the housing 1. The electrode terminal 3 and the tab 21 may be directly connected, for example, the electrode terminal 3 is welded to the tab 21. The electrode terminal 3 and the tab 21 may also be indirectly connected, for example, the electrode terminal 3 and the tab 21 are indirectly connected through a current collector member. The current collector member may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0114] As an example, such as Figures 3 - 5As shown, one end of the housing 11 forms an opening, and there is one end cover 12 in the outer shell 1. One end cover 12 closes one opening of the housing 11. Two electrode terminals 3 are provided on the end cover 12. The two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal. One end of the electrode assembly 2 facing the end cover 12 is formed with a positive electrode tab and a negative electrode tab. The positive electrode terminal is electrically connected to the positive electrode tab, and the negative electrode terminal is electrically connected to the negative electrode tab.

[0115] Please refer to Figures 6 - 8 , Figure 6 which is a schematic structural diagram of the electrode assembly 2 provided by some embodiments of the present application; Figure 7 which is a schematic structural diagram of the first electrode plate 22 provided by some embodiments of the present application; Figure 8 which is a schematic structural diagram of the second electrode plate 23 provided by some embodiments of the present application. Some embodiments of the present application provide a battery cell 10, including an outer shell 1 and an electrode assembly 2. The electrode assembly 2 is accommodated in the outer shell 1. The electrode assembly 2 includes a first electrode plate 22, a second electrode plate 23, a solid electrolyte layer 24 and an insulating member 25. The first electrode plate 22 includes a first active material region 221 and a first tab 222, and the first tab 222 protrudes from the first active material region 221. The second electrode plate 23 has the opposite polarity to the first electrode plate 22. The second electrode plate 23 includes a main body region 231 and an extending region 232 that extends beyond the first active material region 221. The main body region 231 and the first active material region 221 are stacked along a first direction Z. Along the first direction Z, at least a part of the solid electrolyte layer 24 is disposed between the first electrode plate 22 and the second electrode plate 23; the insulating member 25 is disposed in the edge region of the first active material region 221, and the insulating member 25 is configured to insulate and isolate the extending region 232 and the first active material region 221.

[0116] The electrode assembly 2 can be a stacked structure, that is, the electrode assembly 2 is a stacked electrode assembly. The first electrode plate 22, the solid electrolyte layer 24 and the second electrode plate 23 are stacked to form a stacked structure. The stacking direction of the first electrode plate 22, the solid electrolyte layer 24 and the second electrode plate 23 is parallel to the first direction Z. The first electrode plate 22 and the second electrode plate 23 can be in the shape of a circle or a rectangle; the electrode assembly 2 can also be a wound structure, that is, the electrode assembly 2 is a wound electrode assembly. The first electrode plate 22, the solid electrolyte layer 24 and the second electrode plate 23 are wound to form a wound structure. In the wound electrode assembly, the electrode assembly 2 can include a flat region and a bent region. Bent regions can be provided at both opposite ends of the flat region. In the flat region, the stacking direction of the first electrode plate 22, the solid electrolyte layer 24 and the second electrode plate 23 is parallel to the first direction Z. The main body region 231 of the second electrode plate 23 and the first active material region 221 of the first electrode plate 22 are both located in the flat region. In Figure 6 the embodiment shown, the electrode assembly 2 is a stacked structure.

[0117] One of the first electrode tab 22 and the second electrode tab 23 is a positive electrode tab, and the other is a negative electrode tab. It can be understood that the first electrode tab 22 can be the positive electrode tab and the second electrode tab 23 can be the negative electrode tab; or the first electrode tab 22 can be the negative electrode tab and the second electrode tab 23 can be the positive electrode tab. The first electrode tab 22 can be one or more; the second electrode tab 23 can be one or more.

[0118] As Figure 7 shown, the first electrode tab 22 can include a first active material layer 223 and a first current collector 224. The first current collector 224 is provided with the first active material layer 223 on at least one surface in the thickness direction. The region of the first electrode tab 22 corresponding to the first active material layer 223 is the first active material region 221. The first active material layer 223 forms a part of the first active material region 221. At least a part of the region of the first current collector 224 where the first active material layer 223 is not provided forms the first tab 222. It can be understood that if the first electrode tab 22 is a positive electrode tab, the first active material layer 223 includes a positive electrode active material; if the first electrode tab 22 is a negative electrode tab, the first active material layer 223 includes a negative electrode active material. Taking the electrode assembly 2 as a stacked electrode assembly as an example, if the first electrode tab 22 is one, the first tab 222 of the first electrode tab 22 can form a tab 21 of the electrode assembly 2; if the first electrode tab 22 is multiple, the first tabs 222 of the multiple first electrode tabs 22 connected together can form a tab 21 of the electrode assembly 2.

[0119] The extended region 232 is the region where the second electrode tab 23 extends beyond the first active material region 221. In the projection plane perpendicular to the first direction Z, the positive projection of the extended region 232 may not overlap with the positive projection of the first active material region 221. The extended region 232 can be flush with the main body region 231, so that the two surfaces of the extended region 232 opposite to each other along the first direction Z are respectively flush with the two surfaces of the main body region 231 opposite to each other along the first direction Z; or the extended region 232 can be offset from the main body region 231, so that the two surfaces of the extended region 232 opposite to each other along the first direction Z are respectively offset from the two surfaces of the main body region 231 opposite to each other along the first direction Z.

[0120] In an embodiment where the electrode assembly 2 has a wound structure, at least one end of the main body region 231 in the extending direction of the winding axis of the electrode assembly 2 may be provided with an extended region 232. That is to say, the second electrode tab 23 may extend beyond at least one end of the first active material region 221 in the extending direction of the winding axis of the electrode assembly 2 to correspondingly form the extended region 232. In an embodiment where the electrode assembly 2 has a stacked structure, if the positive electrode tab and the negative electrode tab are circular sheet structures, the extended region 232 may be an annular structure extending beyond the edge of the first active material region 221; if the first electrode tab 22 and the second electrode tab 23 are rectangular sheet structures, the second electrode tab 23 may extend beyond at least one edge of the first active material region 221 to correspondingly form the extended region 232.

[0121] As Figure 8 shown, the second electrode tab 23 may include a second active material layer 233 and a second current collector 234. The second current collector 234 is provided with the second active material layer 233 on at least one surface in the thickness direction. At least a part of the region of the second current collector 234 where the second active material layer 233 is not provided forms a second tab 235. As Figure 6 shown, after the electrode assembly 2 is formed, a part of the second current collector 234 may be located in the main body region 231, and another part may be located in the extended region 232. The second tab 235 is located in the extended region 232. A part of the second active material layer 233 may be located in the main body region 231, and another part may be located in the extended region 232.

[0122] It can be understood that if the second electrode tab 23 is a positive electrode tab, the second active material layer 233 includes a positive electrode active material; if the second electrode tab 23 is a negative electrode tab, the second active material layer 233 includes a negative electrode active material. Taking the electrode assembly 2 as a stacked electrode assembly as an example, if there is one second electrode tab 23, the first tab 222 of the second electrode tab 23 may form a tab 21 of the electrode assembly 2; if there are multiple second electrode tabs 23, the second tabs 235 of the multiple second electrode tabs 23 connected together may form a tab 21 of the electrode assembly 2.

[0123] The insulating member 25 is made of an insulating material. The insulating member 25 is disposed in the edge region of the first active material region 221. The insulating member 25 may only be in contact with the first active material region 221, and the insulating member 25 and the first active material region 221 are not connected to each other. The insulating member 25 may also be connected to the first active material layer 223. For example, the insulating member 25 is an insulating tape adhered to the first active material layer 223. Among them, the edge region of the first active material region 221 is the region of the first active material region 221 close to its edge.

[0124] In the embodiment of the present application, an insulating member 25 is provided in the edge region of the first active material region 221. The insulating member 25 can insulate and isolate the excess region 232 of the second pole piece 23 from the first active material region 221 of the first pole piece 22, reducing the risk of overlap between the excess region 232 and the first active material region 221, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23 and improving the reliability of the battery cell 10.

[0125] In some embodiments, please refer to Figure 9 and Figure 10 , Figure 9 is Figure 6 a partial enlarged view of B in Figure 10 is Figure 6 a partial enlarged view of C in . Along the first direction Z, the first active material region 221 has a first surface 2211 facing the main body region 231. At least a part of the excess region 232 is located on the side of the first surface 2211 facing away from the main body region 231, and at least a part of the insulating member 25 is located between the excess region 232 and the first active material region 221.

[0126] The excess region 232 may be entirely located on the side of the first surface 2211 facing away from the main body region 231, or may be partially located on the side of the first surface 2211 facing away from the main body region 231. The first surface 2211 is the surface of the first active material layer 223 facing away from the first current collector 224 along the first direction Z.

[0127] As an example, in the embodiments shown in Figure 9 and Figure 10 , the excess region 232 is only partially located on the side of the first surface 2211 facing away from the main body region 231. It can be understood that the excess region 232 extends beyond the first surface 2211 along the direction from the main body region 231 to the first active material region 221. The part of the second current collector 234 located in the excess region 232 is connected to the part located in the main body region 231, and the part of the second active material layer 233 located in the excess region 232 is separated from the part located in the main body region 231 and is arranged in a staggered manner along the first direction Z.

[0128] The insulating member 25 may be entirely located between the excess region 232 and the first active material region 221, or may be only partially located between the excess region 232 and the first active material region 221. The first active material region 221 has a side surface at its edge position, and the side surface is connected to the first surface 2211 and may cover a part or all of the side surface.

[0129] In this embodiment, at least a part of the overhanging region 232 is located on the side of the first surface 2211 facing away from the main body region 231, so that the overhanging region 232 plays a certain protective role for the first active material region 221 and reduces the risk of damage to the first active material region 221. At least a part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221, which can effectively reduce the risk of overlap between the overhanging region 232 and the first active material region 221.

[0130] In some embodiments, please continue to refer to Figure 9 and Figure 10 , the solid electrolyte layer 24 includes a first part 241 and a second part 242. Along the first direction Z, the first part 241 and the second part 242 are arranged in a staggered manner. The first part 241 is arranged between the main body region 231 and the first active material region 221, and the second part 242 is stacked with the overhanging region 232. Along the first direction Z, the first active material region 221 has a first surface 2211 facing the main body region 231. At least a part of the second part 242 is located on the side of the first surface 2211 facing away from the main body region 231, and at least a part of the insulating member 25 is located between the second part 242 and the first active material region 221.

[0131] Along the first direction Z, the first part 241 and the second part 242 are arranged in a staggered manner, so that the two surfaces of the first part 241 facing each other along the first direction Z are respectively staggered with the two surfaces of the second part 242 facing each other along the first direction Z. The first part 241 and the second part 242 can be in a connected state or in a separated state.

[0132] In the second electrode plate 23, it is possible that each overhanging region 232 is provided with a second part 242. The second part 242 can be entirely located on the side of the first surface 2211 facing away from the main body region 231, or partially located on the side of the first surface 2211 facing away from the main body region 231. It can be understood that if at least a part of the overhanging region 232 is located on the side of the first surface 2211 facing away from the main body region 231, then the second part 242 is entirely located on the side of the first surface 2211 facing away from the main body region 231.

[0133] As an example, in the embodiments shown in Figure 9 and Figure 10 , the second part 242 is entirely located on the side of the first surface 2211 facing away from the main body region 231, and the first part 241 and the second part 242 are separated from each other. A part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221, and another part of the insulating member 25 is located between the second part 242 and the first active material region 221.

[0134] In this embodiment, the second portion 242 of the solid electrolyte layer 24 is stacked with the excess region 232, and the solid electrolyte layer 24 can cover a portion of the surface of the excess region 232, thereby reducing the risk of the excess region 232 overlapping the first active material region 221. At least a portion of the second portion 242 is located on the side of the first surface 2211 away from the main region 231, and at least a portion of the insulating member 25 is located between the second portion 242 and the first active material region 221, so that the insulating member 25 can cover more areas of the side surface of the first active material region 221 connected to the first surface 2211, thereby reducing the risk of the excess region 232 overlapping the side surface of the first active material region 221.

[0135] In some embodiments, along the first direction Z, at least a portion of the insulating member 25 is located between the first active material region 221 and the body region 231 .

[0136] The portion of the insulating member 25 located between the first active material region 221 and the main body region 231 may be located between the first active material region 221 and the solid electrolyte layer 24 , or between the main body region 231 and the solid electrolyte layer 24 .

[0137] It can be understood that in the embodiment where at least a portion of the insulating member 25 is located between the excess region 232 and the first active material region 221 , the insulating member 25 is only partially located between the first active material region 221 and the main region 231 .

[0138] The portion of the insulating member 25 located between the first active material region 221 and the main body region 231 can separate the first active material region 221 from the main body region 231 , thereby reducing the risk of overlapping the edge region of the first active material region 221 with the main body region 231 .

[0139] In some embodiments, please refer to Figure 9 and Figure 10 Along the first direction Z, a portion of the insulating member 25 located between the first active material region 221 and the main body region 231 is connected to a side of the first active material region 221 facing the main body region 231 .

[0140] The portion of the insulating member 25 located between the first active material region 221 and the main body region 231 may be connected to the first surface 2211, or a recess may be provided on the first surface 2211 to accommodate the portion of the insulating member 25 located between the first active material region 221 and the main body region 231. As an example, the portion of the insulating member 25 located between the first active material region 221 and the main body region 231 is bonded to the side of the first active material region 221 facing the main body region 231.

[0141] In this embodiment, the part of the insulating member 25 located between the first active material region 221 and the main body region 231 is connected to the side of the first active material region 221 facing the main body region 231, so that the insulating member 25 is connected to the first active material region 221, improving the firmness of the insulating member 25 and reducing the risk of the insulating member 25 coming off.

[0142] In some embodiments, at least one end of the main body region 231 in the second direction Y is provided with an extending region 232, and an insulating member 25 is provided at the end of the first active material region 221 close to the extending region 232 in the second direction Y, and the second direction Y is perpendicular to the first direction Z.

[0143] It can be understood that the second pole piece 23 can extend beyond at least one end of the first active material region 221 in the second direction Y to correspondingly form the extending region 232. In the second direction Y, the main body region 231 can be provided with the extending region 232 at only one end, and an insulating member 25 is provided at one end of the first active material region 221 in the second direction Y; as Figure 9 and Figure 10 shown, in the second direction Y, the main body region 231 can also be provided with the extending regions 232 at both ends, and insulating members 25 are provided at both ends of the first active material region 221 in the second direction Y.

[0144] The end of the first active material region 221 close to the extending region 232 in the second direction Y belongs to the edge region of the first active material region 221. In the second direction Y, the end face of the end of the first active material region 221 is the side surface of the first active material region 221.

[0145] In the embodiment where the electrode assembly 2 is a wound structure, the second direction Y can be parallel to the extending direction of the winding axis of the electrode assembly 2; in the embodiment where the electrode assembly 2 is a stacked structure, if the first pole piece 22 and the second pole piece 23 are rectangular sheet structures, the second direction Y can be parallel to the length direction or the width direction of the first pole piece 22.

[0146] In this embodiment, at least one end of the main body region 231 in the second direction Y is provided with an extending region 232, and an insulating member 25 is provided at the end of the first active material region 221 close to the extending region 232 in the second direction Y, which can reduce the risk of the extending region 232 and the first active material region 221 overlapping in the second direction Y, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23.

[0147] In some embodiments, please refer to Figures 9 - 11 , Figure 11 is Figure 9Schematic structural diagram of the insulating member 25 shown. Along the first direction Z, second pole pieces 23 are provided on both sides of the first pole piece 22. Two insulating members 25 are provided at the end of the first active material region 221 along the second direction Y close to and exceeding the region 232. The insulating member 25 provided at at least one end of the first active material region 221 along the second direction Y includes a first insulating portion 251, a second insulating portion 252, and a third insulating portion 253 connected in sequence. Along the first direction Z, at least a part of the first insulating portion 251 is provided between the first active material region 221 and the main body region 231, and at least a part of the third insulating portion 253 is provided between the exceeding regions 232 of two adjacent second pole pieces 23. Along the second direction Y, at least a part of the second insulating portion 252 is provided between the first active material region 221 and the exceeding region 232.

[0148] It should be noted that in the embodiment where insulating members 25 are provided at both ends of the first active material region 221 along the second direction Y, along the second direction Y, it may be that the insulating member 25 provided at one end of the first active material region 221 has the above structure, or it may be that the insulating members 25 provided at both ends of the first active material region 221 have the above structure. As an example, in Figure 9 and Figure 10 In the embodiment shown, the insulating members 25 provided at both ends of the first active material region 221 have the above structure.

[0149] Along the first direction Z, the first insulating portion 251 may be only partially provided between the first active material region 221 and the main body region 231, or may be entirely provided between the first active material region 221 and the main body region 231. The third insulating portion 253 may be only partially provided between the exceeding regions 232 of two adjacent second pole pieces 23, or may be entirely provided between the exceeding regions 232 of two adjacent second pole pieces 23; along the second direction Y, the second insulating portion 252 may be only partially provided between the first active material region 221 and the exceeding region 232, or may be entirely provided between the first active material region 221 and the exceeding region 232.

[0150] It can be understood that among the two insulating members 25 provided at the same end of the first active material region 221 along the second direction Y, along the first direction Z, at least a part of the first insulating portion 251 of one insulating member 25 is disposed between the first active material region 221 and the main body region 231 of one second pole piece 23, and at least a part of the first insulating portion 251 of the other insulating member 25 is disposed between the first active material region 221 and the main body region 231 of the other second pole piece 23. At least a part of the third insulating portions 253 of the two insulating members 25 are both disposed in the extended regions 232 of two adjacent second pole pieces 23; along the second direction Y, at least a part of the second insulating portion 252 of one insulating member 25 is disposed between the first active material region 221 and the extended region 232 of one second pole piece 23, and at least a part of the second insulating portion 252 of the other insulating member 25 is disposed between the first active material region 221 and the extended region 232 of the other second pole piece 23.

[0151] In an embodiment where the solid electrolyte layer 24 includes a first portion 241 and a second portion 242 that are offset along the first direction Z, along the first direction Z, the first insulating portion 251 can be disposed between the first portion 241 of the solid electrolyte layer 24 and the first active material region 221, or can be disposed between the first portion 241 of the solid electrolyte layer 24 and the main body region 231. The third insulating portion 253 can be disposed between two adjacent second portions 242; along the second direction Y, a part of the second insulating portion 252 is disposed between the first active material region 221 and the extended region 232, and another part of the second insulating portion 252 is disposed between the first active material region 221 and the second portion 242.

[0152] It should be noted that among the two insulating members 25 provided at the same end of the first active material region 221 along the second direction Y, the two third insulating portions 253 of the two insulating members 25 can be spaced apart, or can only be in contact with each other but not connected to each other, or can be connected together, or a part can be spaced apart and another part can be connected to each other.

[0153] As an example, the first insulating portion 251, the second insulating portion 252, and the third insulating portion 253 can be integrally formed, and the first insulating portion 251, the second insulating portion 252, and the third insulating portion 253 can form a "Z" - shaped structure.

[0154] In this embodiment, by arranging two insulating members 25 at the end of the first active material region 221 close to and exceeding the region 232 along the second direction Y, the insulating isolation between the exceeding regions 232 of the second pole pieces 23 on both sides of the first pole piece 22 and the first active material region 221 of the first pole piece 22 can be achieved, and the exceeding regions 232 of two adjacent second pole pieces 23 can be separated in the second direction Y, reducing the risk of mutual influence of the exceeding regions 232. The insulating member 25 with this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least part of the second insulating portion 252 of the insulating member 25 is arranged between the first active material region 221 and the exceeding region 232 along the second direction Y, the second insulating portion 252 can not only separate the first active material region 221 and the exceeding region 232, but also separate the risk of burrs generated during the forming of the end of the first active material region 221 along the second direction Y from contacting the exceeding region 232, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23.

[0155] In some embodiments, please continue to refer to Figure 9 and Figure 10 , along the first direction Z, the first insulating portions 251 of the two insulating members 25 are respectively connected to opposite sides of the first active material region 221.

[0156] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, and both of the two first surfaces 2211 are provided with recesses. Among the two insulating members 25 arranged at the same end of the first active material region 221 along the second direction Y, the first insulating portions 251 of the two insulating members 25 are respectively received in the recesses of the two first surfaces 2211, so that the surface of the first insulating portion 251 facing the main body region 231 is flush with the first surface 2211. The first insulating portions 251 of the two insulating members 25 are respectively bonded to opposite sides of the first active material region 221.

[0157] In this embodiment, the first insulating portions 251 of the two insulating members 25 are respectively connected to opposite sides of the first active material region 221, so that the two insulating members 25 are respectively connected to opposite sides of the first active material region 221, improving the firmness of the insulating member 25 and reducing the risk of the insulating member 25 detaching. During the preparation of the electrode assembly 2, the first insulating portions 251 of the two insulating members 25 can be respectively connected to opposite sides of the first active material region 221 first. After fixing the two insulating members 25 at the end of the first active material region 221 along the second direction Y, the first pole piece 22, the solid electrolyte layer 24, and the second pole piece 23 are laminated, which can effectively reduce the installation difficulty of the insulating member 25.

[0158] In some embodiments, please continue to refer to Figure 10, the third insulating portions 253 of the two insulating members 25 provided at at least one end of the first active material region 221 along the second direction Y are connected to each other.

[0159] It may be that the third insulating portions 253 of the two insulating members 25 provided at one end of the first active material region 221 along the second direction Y are connected to each other, or it may be that the third insulating portions 253 of the two insulating members 25 provided at both ends of the first active material region 221 along the second direction Y are connected to each other.

[0160] As an example, the third insulating portions 253 of the two insulating members 25 are bonded to each other.

[0161] In this embodiment, the third insulating walls of the two insulating members 25 are connected to each other, so that the two insulating members 25 form an integral body to hold the second insulating portions 252 of the two insulating members 25 between the first active material region 221 and the overhanging region 232. The two insulating members 25 cooperate to cover more areas of the end face of the first active material region 221 in the second direction Y, reducing the risk of overlap between the overhanging region 232 and the end face of the first active material region 221.

[0162] In some embodiments, please continue to refer to Figure 9 , along the second direction Y, at least one end of the first active material region 221 is provided with a first tab 222. Among the insulating members 25 provided at the end of the first active material region 221 along the second direction Y close to the first tab 222, along the first direction Z, at least a part of the third insulating portion 253 is located between the first tab 222 and the overhanging region 232.

[0163] Among the insulating members 25 provided at the end of the first active material region 221 along the second direction Y close to the first tab 222, along the first direction Z, only a part of the third insulating portion 253 may be located between the first tab 222 and the overhanging region 232, or all of it may be located between the first tab 222 and the overhanging region 232.

[0164] As an example, along the second direction Y, only one end of the first active material region 221 is provided with a first tab 222. Among the two insulating members 25 provided at the end of the first active material region 221 along the second direction Y close to the first tab 222, a part of the two insulating members 25 is separated by the first tab 222, and a part of the two insulating members 25 is connected to each other.

[0165] In this embodiment, the third insulating portion 253 can play a role in separating the first tab 222 and the overhanging region 232, reducing the risk of overlap between the overhanging region 232 and the first tab 222, which may cause a short circuit between the first tab 22 and the second tab 23.

[0166] In some embodiments, please continue to refer to Figure 9 andFigure 10 In the second direction Y, the third insulating portion 253 extends beyond one end of the extending region 232 away from the main body region 231.

[0167] As an example, in the second direction Y, the size of the third insulating portion 253 is larger than that of the extending region 232, such that the third insulating portion 253 extends beyond one end of the extending region 232 away from the main body region 231.

[0168] In this embodiment, the third insulating portion 253 has a larger size in the second direction Y, increasing the insulation range of the third insulating portion 253 in the second direction Y, and thus enhancing the insulation ability of the third insulating portion 253.

[0169] In some embodiments, please refer to Figures 12 - 14 , Figure 12 which is a schematic structural diagram of the electrode assembly 2 provided in some other embodiments of the present application; Figure 13 is Figure 12 a partial enlarged view at D in Figure 14 is Figure 13 a schematic structural diagram of the insulating member 25 shown in . Along the first direction Z, second electrode plates 23 are disposed on both sides of the first electrode plate 22. The insulating member 25 disposed at at least one end of the first active material region 221 in the second direction Y includes a second insulating portion 252 and two first insulating portions 251, and the second insulating portion 252 connects the two first insulating portions 251. Along the first direction Z, at least a part of one first insulating portion 251 is disposed between the first active material region 221 and the main body region 231 of one second electrode plate 23, and at least a part of the other first insulating portion 251 is disposed between the first active material region 221 and the main body region 231 of the other second electrode plate 23; along the second direction Y, at least a part of the second insulating portion 252 is disposed between the first active material region 221 and the extending region 232.

[0170] It should be noted that in the embodiments where the insulating members 25 are disposed at both ends of the first active material region 221 in the second direction Y, in the second direction Y, it may be that the insulating member 25 disposed at one end of the first active material region 221 has the above structure, or it may be that the insulating members 25 disposed at both ends of the first active material region 221 both have the above structure. As an example, along the first direction Z, only one end of the first active material region 221 is provided with a first tab 222, and the insulating member 25 disposed at one end of the first active material region 221 away from the first tab 222 adopts Figure 13 the structure of the insulating member 25 shown in Figure 9 and the insulating member 25 disposed at one end of the first active material region 221 close to the first tab 222 adopts

[0171] Along the first direction Z, a first insulating portion 251 may be partially disposed only between the first active material region 221 and the main body region 231 of a second pole piece 23, or may be entirely disposed between the first active material region 221 and the main body region 231 of a second pole piece 23. Another first insulating portion 251 may be partially disposed only between the first active material region 221 and the main body region 231 of another second pole piece 23, or may be entirely disposed between the first active material region 221 and the main body region 231 of another second pole piece 23. Along the second direction Y, the second insulating portion 252 may be partially disposed only between the first active material region 221 and the extended region 232, or may be entirely disposed between the first active material region 221 and the extended region 232. The second insulating portion 252 may cover a part of the end face of the end of the first active material region 221 along the second direction Y, or may cover the entire end face of the end of the first active material region 221 along the second direction Y.

[0172] In an embodiment where the solid electrolyte layer 24 includes a first portion 241 and a second portion 242 disposed offset along the first direction Z, along the first direction Z, the first insulating portion 251 may be disposed between the first portion 241 of the solid electrolyte layer 24 and the first active material region 221, or may be disposed between the first portion 241 of the solid electrolyte layer 24 and the main body region 231. Along the second direction Y, a part of the second insulating portion 252 is disposed between the first active material region 221 and the extended region 232, and another part of the second insulating portion 252 is disposed between the first active material region 221 and the second portion 242.

[0173] The second insulating portion 252 and the two first insulating portions 251 may be integrally formed, and one first insulating portion 251, the second insulating portion 252, and the other first insulating portion 251 may be sequentially connected to form a "U" - shaped structure.

[0174] In this embodiment, the insulating member 25 can achieve the insulating isolation between the second pole pieces 23 located on both sides of the first pole piece 22 in the extended region 232 in the second direction Y and the first active material region 221 of the first pole piece 22. The structure is simple and the material used for the insulating member 25 is reduced. In addition, since at least a part of the second insulating portion 252 of the insulating member 25 is disposed between the first active material region 221 and the extended region 232 along the second direction Y, the second insulating portion 252 can not only separate the first active material region 221 and the extended region 232, but also separate the risk that the burrs generated during the forming of the end of the first active material region 221 along the second direction Y come into contact with the extended region 232, thereby reducing the risk of short - circuit between the first pole piece 22 and the second pole piece 23.

[0175] In some embodiments, please continue to refer to 13 , along the first direction Z, the two first insulating portions 251 of the insulating member 25 are respectively connected to two opposite sides of the first active material region 221 .

[0176] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, both of which are provided with recesses, and the two first insulating portions 251 of the insulating member 25 are respectively accommodated in the recesses of the two first surfaces 2211, so that the surface of the first insulating portion 251 facing the main region 231 is flush with the first surface 2211. The two first insulating portions 251 of the insulating member 25 are respectively bonded to the opposite sides of the first active material region 221.

[0177] In this embodiment, the two first insulating parts 251 of the insulating member 25 are respectively connected to the opposite sides of the first active material area 221, which improves the firmness of the insulating member 25 and reduces the risk of the insulating member 25 being separated. In the process of preparing the electrode assembly 2, the two first insulating parts 251 of the insulating member 25 can be respectively connected to the opposite sides of the first active material area 221, and the insulating member 25 can be fixed to the end of the first active material area 221 along the second direction Y, and then the first pole piece 22, the solid electrolyte layer 24 and the second pole piece 23 are stacked, which can effectively reduce the difficulty of installing the insulating member 25.

[0178] In some embodiments, please refer to Figure 9 , Figure 10 and Figure 13 , a dimension of the first insulating portion 251 along the second direction Y is L1, 0.1 mm≤L1≤10 mm.

[0179] L1 can be any point value among 0.1mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc., or a range value between any two of them.

[0180] L1≥0.1mm, so that the first insulating part 251 has a sufficient size along the second direction Y, which is beneficial to enhancing the firmness of the insulating part 25 and reducing the risk of the insulating part 25 detaching; L1≤10mm, so that the size of the first insulating part 251 along the second direction Y is not too large, on the one hand, reducing the influence of the first insulating part 251 on the transmission of active ions between the first pole piece 22 and the second pole piece 23, on the other hand, reducing the material used for the first insulating part 251, and having better economy.

[0181] In some embodiments, 2 mm ≤ L1 ≤ 8 mm.

[0182] L1 can take any one of the point values such as 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, 5 mm, 5.3 mm, 5.5 mm, 5.8 mm, 6 mm, 6.3 mm, 6.5 mm, 6.8 mm, 7 mm, 7.3 mm, 7.5 mm, 7.8 mm, 8 mm, etc., or the range value between any two of them.

[0183] In this embodiment, 2 mm ≤ L1 ≤ 8 mm, further taking into account the firmness and economy of the insulating member 25.

[0184] In some embodiments, please continue to refer to Figure 6 and Figure 12 , both ends of the main body region 231 along the second direction Y are provided with an overhanging region 232, and insulating members 25 are provided at both ends of the first active material region 221 along the second direction Y.

[0185] It can be understood that both ends of the first active material region 221 along the second direction Y belong to the edge region of the first active material region 221.

[0186] The above structure can reduce the risk of the two overhanging regions 232 of the second pole piece 23 along the second direction Y overlapping with the first active material region 221, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23.

[0187] In some embodiments, please refer to Figure 15 , Figure 15 is a schematic structural diagram of the electrode assembly 2 provided in still other embodiments of the present application. At least one end of the main body region 231 along the third direction X is provided with an overhanging region 232, an insulating member 25 is provided at the end of the first active material region 221 along the third direction X close to the overhanging region 232, and the first direction Z and the second direction Y are both perpendicular to the third direction X.

[0188] It can be understood that the second pole piece 23 can extend beyond at least one end of the first active material region 221 along the third direction X to correspondingly form an overhanging region 232. Along the third direction X, only one end of the main body region 231 can be provided with an overhanging region 232, and an insulating member 25 is provided at one end of the first active material region 221 along the third direction X; as Figure 15 shown, along the third direction X, both ends of the main body region 231 can also be provided with overhanging regions 232, and insulating members 25 are provided at both ends of the first active material region 221 along the third direction X.

[0189] The end of the first active material region 221 along the third direction X close to the overhanging region 232 belongs to the edge region of the first active material region 221. Along the third direction X, the end face of the end of the first active material region 221 is the side surface of the first active material region 221.

[0190] As an example, the electrode assembly 2 is a stacked structure, the first electrode sheet 22 and the second electrode sheet 23 are rectangular sheet structures, the first direction Z is parallel to the thickness direction of the first electrode sheet 22, and one of the second direction Y and the third direction X can be parallel to the length direction of the first electrode sheet 22, and the other is parallel to the width direction of the first electrode sheet 22.

[0191] In this embodiment, the overhanging region 232 is provided at at least one end of the main body region 231 along the third direction X, and the insulating member 25 is provided at the end of the first active material region 221 along the third direction X close to the overhanging region 232, so that the risk of overlap between the overhanging region 232 and the first active material region 221 in the third direction X can be reduced, thereby reducing the risk of short circuit between the first electrode sheet 22 and the second electrode sheet 23.

[0192] In some embodiments, please refer to Figure 16 , Figure 16 is Figure 15 the schematic structural view of the E position in. Along the first direction Z, the second electrode sheets 23 are provided on both sides of the first electrode sheet 22; two insulating members 25 are provided at the end of the first active material region 221 along the third direction X close to the overhanging region 232, and the insulating member 25 provided at at least one end of the first active material region 221 along the third direction X includes a fourth insulating portion 254, a fifth insulating portion 255 and a sixth insulating portion 256 connected in sequence. Along the first direction Z, at least a part of the fourth insulating portion 254 is provided between the first active material region 221 and the main body region 231, and at least a part of the sixth insulating portion 256 is provided between the overhanging regions 232 of two adjacent second electrode sheets 23. Along the third direction X, at least a part of the fifth insulating portion 255 is provided between the first active material region 221 and the overhanging region 232.

[0193] It should be noted that in the embodiments where the insulating members 25 are provided at both ends of the first active material region 221 along the third direction X, along the third direction X, the insulating member 25 provided at one end of the first active material region 221 can be the above structure, or the insulating members 25 provided at both ends of the first active material region 221 can be the above structure. As an example, in Figure 16 the shown embodiment, the insulating members 25 provided at both ends of the first active material region 221 are both the above structure.

[0194] Along the first direction Z, the fourth insulating portion 254 may be partially disposed only between the first active material region 221 and the main body region 231, or may be entirely disposed between the first active material region 221 and the main body region 231. The sixth insulating portion 256 may be partially disposed only between the extending regions 232 of two adjacent second electrode plates 23, or may be entirely disposed between the extending regions 232 of two adjacent second electrode plates 23. Along the third direction X, the fifth insulating portion 255 may be partially disposed only between the first active material region 221 and the extending region 232, or may be entirely disposed between the first active material region 221 and the extending region 232.

[0195] It can be understood that among the two insulating members 25 disposed at the same end of the first active material region 221 along the third direction X, along the first direction Z, at least a part of the fourth insulating portion 254 of one insulating member 25 is disposed between the first active material region 221 and the main body region 231 of one second electrode plate 23, and at least a part of the fourth insulating portion 254 of the other insulating member 25 is disposed between the first active material region 221 and the main body region 231 of the other second electrode plate 23. The sixth insulating portions 256 of the two insulating members 25 are at least partially disposed in the extending regions 232 of two adjacent second electrode plates 23. Along the third direction X, at least a part of the fifth insulating portion 255 of one insulating member 25 is disposed between the first active material region 221 and the extending region 232 of one second electrode plate 23, and at least a part of the fifth insulating portion 255 of the other insulating member 25 is disposed between the first active material region 221 and the extending region 232 of the other second electrode plate 23.

[0196] In an embodiment where the solid electrolyte layer 24 includes a first portion 241 and a second portion 242 that are offset along the first direction Z, along the first direction Z, the fourth insulating portion 254 may be disposed between the first portion 241 of the solid electrolyte layer 24 and the first active material region 221, or may be disposed between the first portion 241 of the solid electrolyte layer 24 and the main body region 231. The sixth insulating portion 256 may be disposed between two adjacent second portions 242. Along the third direction X, a part of the fifth insulating portion 255 is disposed between the first active material region 221 and the extending region 232, and another part of the fifth insulating portion 255 is disposed between the first active material region 221 and the second portion 242.

[0197] It should be noted that among the two insulating members 25 disposed at the same end of the first active material region 221 along the third direction X, the two sixth insulating portions 256 of the two insulating members 25 may be disposed at intervals, or may only be in contact with each other but not connected to each other, or may be connected to each other, or a part may be disposed at intervals and another part may be connected to each other.

[0198] As an example, the fourth insulating portion 254, the fifth insulating portion 255, and the sixth insulating portion 256 can be integrally formed, and the fourth insulating portion 254, the fifth insulating portion 255, and the sixth insulating portion 256 can form a "Z" - shaped structure.

[0199] In this embodiment, by disposing two insulating members 25 at the end of the first active material region 221 along the third direction X close to and exceeding the region 232, the insulating isolation between the exceeding regions 232 of the second pole pieces 23 on both sides of the first pole piece 22 and the first active material region 221 of the first pole piece 22 in the third direction X can be achieved, and the exceeding regions 232 of two adjacent second pole pieces 23 in the third direction X can be separated, reducing the risk of mutual influence of the exceeding regions 232. The insulating member 25 of this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least a part of the fifth insulating portion 255 of the insulating member 25 is disposed between the first active material region 221 and the exceeding region 232 along the third direction X, the fifth insulating portion 255 can not only separate the first active material region 221 and the exceeding region 232, but also separate the risk of the burrs generated during the forming of the end portion of the first active material region 221 along the third direction X from contacting the exceeding region 232, thereby reducing the risk of short - circuit between the first pole piece 22 and the second pole piece 23.

[0200] In some embodiments, please continue to refer to Figure 16 , along the first direction Z, the fourth insulating portions 254 of the two insulating members 25 are respectively connected to opposite sides of the first active material region 221.

[0201] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, and both of the two first surfaces 2211 are provided with recesses. Among the two insulating members 25 disposed at the same end of the first active material region 221 along the third direction X, the fourth insulating portions 254 of the two insulating members 25 are respectively received in the recesses of the two first surfaces 2211, so that the surface of the fourth insulating portion 254 facing the main body region 231 is flush with the first surface 2211. The fourth insulating portions 254 of the two insulating members 25 are respectively bonded to opposite sides of the first active material region 221.

[0202] In this embodiment, the fourth insulating portions 254 of the two insulating members 25 are respectively connected to the opposite sides of the first active material area 221, so that the two insulating members 25 are respectively connected to the opposite sides of the first active material area 221, thereby improving the firmness of the insulating member 25 and reducing the risk of the insulating member 25 being separated. In the process of preparing the electrode assembly 2, the fourth insulating portions 254 of the two insulating members 25 can be respectively connected to the opposite sides of the first active material area 221, and after the two insulating members 25 are fixed to the ends of the first active material area 221 along the third direction X, the first pole piece 22, the solid electrolyte layer 24 and the second pole piece 23 are stacked, which can effectively reduce the difficulty of installing the insulating member 25.

[0203] In some embodiments, please refer to Figure 16 The sixth insulating portions 256 of the two insulating members 25 provided at at least one end portion of the first active material region 221 along the third direction X are connected to each other.

[0204] The third insulating portions 253 of two insulating members 25 disposed at one end of the first active material region 221 along the third direction X may be connected to each other, or the third insulating portions 253 of two insulating members 25 disposed at both ends of the first active material region 221 along the third direction X may be connected to each other.

[0205] As an example, the sixth insulating portions 256 of two insulating members 25 are bonded to each other.

[0206] In this embodiment, the sixth insulating portions 256 of the two insulating members 25 are connected to each other so that the two insulating members 25 form a whole to maintain the fifth insulating portions 255 of the two insulating members 25 between the first active material region 221 and the protruding region 232. The two insulating members 25 cooperate to cover more areas of the end surface of the first active material region 221 in the third direction X, thereby reducing the risk of overlap between the end surfaces of the protruding region 232 and the first active material region 221.

[0207] In some embodiments, please refer to Figure 16 Along the third direction X, the sixth insulating portion 256 extends beyond the excess region 232 and away from one end of the main region 231 .

[0208] As an example, along the third direction X, the size of the sixth insulating portion 256 is greater than the size of the exceeding region 232 , so that the sixth insulating portion 256 exceeds one end of the exceeding region 232 away from the main region 231 .

[0209] In this embodiment, the size of the sixth insulating portion 256 along the third direction X is larger, which increases the insulation range of the sixth insulating portion 256 in the third direction X, thereby enhancing the insulation capacity of the sixth insulating portion 256 .

[0210] In some embodiments, please refer toFigure 17 and Figure 18 , Figure 17 is a schematic structural view of the electrode assembly 2 provided by some other embodiments of the present application; Figure 18 is Figure 17 a schematic structural view of the position F in. Along the first direction Z, second electrode sheets 23 are disposed on both sides of the first electrode sheet 22; the insulating member 25 disposed at at least one end of the first active material region 221 along the third direction X includes a fifth insulating portion 255 and two fourth insulating portions 254, and the fifth insulating portion 255 connects the two fourth insulating portions 254. Along the first direction Z, at least a part of one fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of one second electrode sheet 23, and at least a part of the other fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of the other second electrode sheet 23; along the third direction X, at least a part of the fifth insulating portion 255 is disposed between the first active material region 221 and the extended region 232.

[0211] It should be noted that in the embodiments where the insulating members 25 are disposed at both ends of the first active material region 221 along the third direction X, along the third direction X, it may be that the insulating member 25 disposed at one end of the first active material region 221 has the above structure, or it may be that the insulating members 25 disposed at both ends of the first active material region 221 both have the above structure. In some embodiments, the insulating member 25 disposed at one end of the first active material region 221 adopts Figure 16 the structure of the insulating member 25 shown, and the insulating member 25 disposed at the other end of the first active material region 221 adopts Figure 18 the structure of the insulating member 25 shown. In some other embodiments, the insulating members 25 disposed at both ends of the first active material region 221 both adopt Figure 18 the structure of the insulating member 25 shown.

[0212] Along the first direction Z, a fourth insulating portion 254 may be partially disposed only between the first active material region 221 and the main body region 231 of a second pole piece 23, or may be entirely disposed between the first active material region 221 and the main body region 231 of a second pole piece 23. Another fourth insulating portion 254 may be partially disposed only between the first active material region 221 and the main body region 231 of another second pole piece 23, or may be entirely disposed between the first active material region 221 and the main body region 231 of another second pole piece 23. Along the third direction X, a fifth insulating portion 255 may be partially disposed only between the first active material region 221 and the extended region 232, or may be entirely disposed between the first active material region 221 and the extended region 232. The fifth insulating portion 255 may cover a part of the end face of the end of the first active material region 221 along the third direction X, or may cover the entire end face of the end of the first active material region 221 along the third direction X.

[0213] In an embodiment where the solid electrolyte layer 24 includes a first portion 241 and a second portion 242 arranged with a dislocation along the first direction Z, along the first direction Z, the fourth insulating portion 254 may be disposed between the first portion 241 of the solid electrolyte layer 24 and the first active material region 221, or may be disposed between the first portion 241 of the solid electrolyte layer 24 and the main body region 231. Along the third direction X, a part of the fifth insulating portion 255 is disposed between the first active material region 221 and the extended region 232, and another part of the fifth insulating portion 255 is disposed between the first active material region 221 and the second portion 242.

[0214] The fifth insulating portion 255 and the two fourth insulating portions 254 may be integrally formed, and one fourth insulating portion 254, the fifth insulating portion 255, and the other fourth insulating portion 254 may be sequentially connected to form a "U" - shaped structure.

[0215] In this embodiment, the insulating member 25 can achieve the insulating isolation between the extended regions 232 of the second pole pieces 23 located on both sides of the first pole piece 22 and the first active material region 221 of the first pole piece 22. The structure is simple and the material used for the insulating member 25 is reduced. In addition, since at least a part of the fifth insulating portion 255 of the insulating member 25 is disposed along the third direction X between the first active material region 221 and the extended region 232, the fifth insulating portion 255 can not only separate the first active material region 221 and the extended region 232, but also separate the risk of the burrs generated during the forming of the end of the first active material region 221 along the third direction X from contacting the extended region 232, thereby reducing the risk of short - circuit between the first pole piece 22 and the second pole piece 23.

[0216] In some embodiments, along the first direction Z, the two fourth insulating portions 254 of the insulating member 25 are respectively connected to opposite sides of the first active material region 221.

[0217] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, and recesses are provided on both first surfaces 2211. The two fourth insulating portions 254 of the insulating member 25 are respectively received in the recesses of the two first surfaces 2211, so that the surfaces of the fourth insulating portions 254 facing the main body region 231 are flush with the first surfaces 2211. The two fourth insulating portions 254 of the insulating member 25 are respectively bonded to opposite sides of the first active material region 221.

[0218] In this embodiment, the two fourth insulating portions 254 of the insulating member 25 are respectively connected to opposite sides of the first active material region 221, which improves the firmness of the insulating member 25 and reduces the risk of the insulating member 25 detaching. During the preparation of the electrode assembly 2, the two fourth insulating portions 254 of the insulating member 25 can be respectively connected to opposite sides of the first active material region 221 first. After fixing the insulating member 25 at the end of the first active material region 221 along the third direction X, the first electrode sheet 22, the solid electrolyte layer 24, and the second electrode sheet 23 are stacked, which can effectively reduce the installation difficulty of the insulating member 25.

[0219] In some embodiments, please continue to refer to Figure 16 and Figure 18 , the dimension of the fourth insulating portion 254 along the third direction X is L2, and 0.1 mm ≤ L2 ≤ 10 mm.

[0220] L2 can take any one of the point values such as 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm or the range value between any two of them.

[0221] L2 ≥ 0.1 mm enables the fourth insulating portion 254 to have a sufficient dimension along the third direction X, which is beneficial to enhancing the firmness of the insulating member 25 and reducing the risk of the insulating member 25 detaching; L2 ≤ 10 mm enables the dimension of the fourth insulating portion 254 along the third direction X not to be too large. On the one hand, it reduces the influence of the first insulating portion 251 on the transmission of active ions between the first electrode sheet 22 and the second electrode sheet 23, and on the other hand, it reduces the material used for the first insulating portion 251, having better economy.

[0222] In some embodiments, 2 mm ≤ L2 ≤ 8 mm.

[0223] L2 can take any one of the point values such as 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.5mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.8mm, 7mm, 7.3mm, 7.5mm, 7.8mm, 8mm, etc., or the range value between any two of them.

[0224] In this embodiment, 2mm ≤ L2 ≤ 8mm, which further takes into account the firmness and economy of the insulating member 25.

[0225] In some embodiments, please continue to refer to Figure 15 and Figure 17 , both ends of the main body area 231 along the third direction X are provided with an extended area 232, and insulating members 25 are provided at both ends of the first active material area 221 along the third direction X.

[0226] It can be understood that both ends of the first active material area 221 along the third direction X belong to the edge area of the first active material area 221.

[0227] The above structure can reduce the risk of the two extended areas 232 of the second pole piece 23 overlapping with the first active material area 221 along the third direction X, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23.

[0228] In some embodiments, the first pole piece 22 is a positive pole piece, and the second pole piece 23 is a negative pole piece.

[0229] Taking the electrode assembly 2 as a stacked structure as an example, the second pole piece 23 can be one more than the first pole piece 22, and a first pole piece 22 is provided between adjacent second pole pieces 23. For the two second pole pieces 23 located at both ends along the first direction Z in the electrode assembly 2, it can be that only the side of the second pole piece 23 facing the first pole piece 22 along the first direction Z is provided with a solid electrolyte layer 24, or it can be that both sides of the second pole piece 23 along the first direction Z are provided with a solid electrolyte layer 24.

[0230] In the case where the second pole piece 23 is a negative pole piece, the second pole piece 23 can only include the second current collector 234. The second current collector 234 can be made of a metal foil, a foam metal, a composite current collector, etc. The second pole piece 23 can also include the second current collector 234 and a second active material layer 233, and the second active material layer 233 is provided on at least one surface of the second current collector 234 in the thickness direction.

[0231] In this embodiment, the negative electrode tab has an extending area 232 that extends beyond the positive electrode tab. Metal ions (such as lithium ions) released by the positive electrode tab during charging can be more readily received by the negative electrode tab, effectively improving the performance of the battery cell 10.

[0232] In some embodiments, the insulating member 25 is a polymer material film layer. The polymer material film layer not only has excellent insulating properties but also has good strength and ductility.

[0233] In some embodiments, the insulating member 25 includes at least one of polypropylene, polyolefin, ethylene vinyl acetate copolymer, epoxy resin glue, silicone rubber, polyurethane, and polyethylene terephthalate.

[0234] The embodiment of the present application provides a battery device 100, including the battery cell 10 provided in any one of the above embodiments.

[0235] The embodiment of the present application provides an electrical device, including the battery cell 10 provided in any one of the above embodiments or the battery device 100 provided in any one of the above embodiments. The battery cell 10 is used to provide electrical energy.

[0236] The embodiment of the present application provides an electrode assembly 2, including a first electrode tab 22, a second electrode tab 23, a solid electrolyte layer 24, and an insulating member 25; the first electrode tab 22 includes a first active material region 221 and a first tab 222, and the first tab 222 protrudes from the first active material region 221; the second electrode tab 23 has a polarity opposite to that of the first electrode tab 22, and the second electrode tab 23 includes a main body region 231 and an extending area 232 that extends beyond the first active material region 221. The main body region 231 and the first active material region 221 are stacked along a first direction Z; along the first direction Z, at least a part of the solid electrolyte layer 24 is disposed between the first electrode tab 22 and the second electrode tab 23; the insulating member 25 is disposed in the edge region of the first active material region 221, and the insulating member 25 is configured to insulate and isolate the extending area 232 and the first active material region 221.

[0237] For the specific structure of the electrode assembly 2 in this embodiment, reference may be made to the specific structure of the electrode assembly 2 described in the foregoing embodiments, and details are not described herein again.

[0238] In this embodiment, an insulating member 25 is disposed in the edge region of the first active material region 221. The insulating member 25 can insulate and isolate the extending area 232 of the second electrode tab 23 from the first active material region 221 of the first electrode tab 22, reducing the risk of overlap between the extending area 232 and the first active material region 221, and further reducing the risk of short circuit between the first electrode tab 22 and the second electrode tab 23.

[0239] Please refer to Figure 19 , Figure 19Flow chart of the preparation method of the electrode assembly 2 provided by some embodiments of the present application. Some embodiments of the present application also provide a preparation method of an electrode assembly 2, including: Step S100: Provide a first electrode sheet 22, a solid electrolyte layer 24 and a second electrode sheet 23; wherein, the polarities of the first electrode sheet 22 and the second electrode sheet 23 are opposite, the first electrode sheet 22 includes a first active material region 221 and a first tab 222, the first tab 222 protrudes from the first active material region 221, and an insulating member 25 is arranged in the edge region of the first active material region 221; Step S200: Stack the first electrode sheet 22, the solid electrolyte layer 24 and the second electrode sheet 23 along the first direction Z to form a stacked structure; Step S300: Apply a pressure treatment to the stacked structure so that the second electrode sheet 23 forms an extending region 232 that extends beyond the first active material region 221, and the insulating member 25 insulates and isolates the extending region 232 and the first active material region 221.

[0240] As an example, the first electrode sheet 22 is a positive electrode sheet, and the second electrode sheet 23 is a negative electrode sheet.

[0241] As an example, the positive electrode active material LiNi 0.7 Co 0.1 Mn 0.1 O2, a conductive agent Super P, and a binder polyvinylidene fluoride (PVDF) are made into a positive electrode slurry in N-methylpyrrolidone (NMP). The solid content in the positive electrode slurry is 50 wt%, and the mass ratio of LiNi 0.7 Co 0.1 Mn 0.1 O2, Super P, and PVDF is 8:1:1. The positive electrode slurry is coated on the upper and lower surfaces of the current collector aluminum foil, dried at 85°C, then cold-pressed, and then trimmed, sliced, and slit. After that, it is dried in a vacuum at 85°C for 4 hours to make a positive electrode sheet. Graphite, a conductive agent Super P, a thickener carboxymethyl cellulose (CMC), and a binder styrene-butadiene rubber (SBR) are mixed evenly in deionized water to make a negative electrode slurry. The solid content in the negative electrode slurry is 30 wt%, and the mass ratio of graphite, silicon monoxide, Super P, CMC, and the binder styrene-butadiene rubber (SBR) in the solid components is 88:7:3:2. The negative electrode slurry is coated on the upper and lower surfaces of the current collector copper foil and dried at 85°C, then cold-pressed, trimmed, sliced, and slit. After that, it is dried in a vacuum at 120°C for 12 hours to make a negative electrode sheet. The solid electrolyte layer 24 is prepared from a sulfide solid electrolyte and polytetrafluoroethylene by a conventional solvent-free dry process.

[0242] Before step S100, an insulating member 25 may be disposed at the edge region of the first active material region 221 of the first electrode sheet 22. For example, the insulating members 25 are adhered to both ends of the first active material region 221 along the second direction Y and both ends along the third direction X, so that insulating members 25 are disposed around the first active material region 221, where the first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs.

[0243] In step S200, the first electrode sheet 22, the solid electrolyte layer 24, and the second electrode sheet 23 may be directly laminated in sequence to form a laminated structure, or the first electrode sheet 22 and the solid electrolyte layer 24 may be first compounded to form a composite structure, and then the composite structure and the second electrode sheet 23 are laminated to form a laminated structure, or the second electrode sheet 23 and the solid electrolyte layer 24 may be first compounded to form a composite structure, and then the composite structure and the first electrode sheet 22 are laminated to form a laminated structure.

[0244] In step S300, the laminated structure may be subjected to hot flat pressing or isostatic pressing.

[0245] For the electrode assembly 2 prepared by the above solution, the insulating member 25 can insulate and isolate the extended region 232 of the second electrode sheet 23 from the first active material region 221 of the first electrode sheet 22, reducing the risk of overlap between the extended region 232 and the first active material region 221, and further reducing the risk of short circuit between the first electrode sheet 22 and the second electrode sheet 23.

[0246] In some embodiments, step S200 includes:

[0247] Step S210: Compound the second electrode sheet 23 and the solid electrolyte layer 24 to form a composite electrode sheet;

[0248] Step S220: Alternately laminate the first electrode sheet 22 and the composite electrode sheet along the first direction Z to form a laminated structure.

[0249] In step S210, the second electrode sheet 23 and the solid electrolyte layer 24 can be compounded in various ways. For example, after the second electrode sheet 23 and the solid electrolyte layer 24 are formed, the two are hot flat pressed and compounded; or, after the second electrode sheet 23 is formed, the solid electrolyte slurry is coated on the surface of the second electrode sheet 23, and after the solid electrolyte slurry is cured, the solid electrolyte layer 24 is formed to realize the compounding of the second electrode sheet 23 and the solid electrolyte layer 24.

[0250] In this embodiment, first compounding the second electrode sheet 23 and the solid electrolyte layer 24 to form a composite electrode sheet, and then alternately laminating the first electrode sheet 22 and the composite electrode sheet along the first direction Z can reduce the lamination difficulty of the first electrode sheet 22, the solid electrolyte layer 24, and the second electrode sheet 23.

[0251] In some embodiments, step S300 includes: subjecting the stacked structure to isostatic pressing.

[0252] In step S300, the stacked structure can be placed in a sealed bag and then the sealed bag can be put into a closed container, and the stacked structure is subjected to isostatic pressing by using the liquid or gas in the closed container. The sealed bag can play a protective role for the stacked structure and reduce the influence of environmental factors on the stacked structure during the isostatic pressing process.

[0253] In this embodiment, the stacked structure is pressed by isostatic pressing, so that the force on the stacked structure is more uniform, and the fitting effect between the first electrode sheet 22 and the second electrode sheet 23 and the solid electrolyte layer 24 is better, which is beneficial to the structural stability and performance of the electrode assembly 2 during the cycling process.

[0254] In some embodiments, the pressure of the isostatic pressing is 100 - 1000 Mpa.

[0255] In this embodiment, the pressure of the isostatic pressing can take any one of the point values such as 100 Mpa, 200 Mpa, 300 Mpa, 400 Mpa, 500 Mpa, 600 Mpa, 700 Mpa, 800 Mpa, 900 Mpa, 1000 Mpa or the range value between any two of them.

[0256] Subjecting the stacked structure to isostatic pressing with a pressure of 100 - 1000 Mpa enables both the first electrode sheet 22 and the second electrode sheet 23 to be closely attached to the solid electrolyte layer 24, reduces the interfacial impedance between the electrode sheet and the solid electrolyte layer 24, and makes the structure of the electrode assembly 2 more compact, which is beneficial to improving the volumetric energy density of the battery cell 10 and at the same time can reduce the risk of the first electrode sheet 22, the second electrode sheet 23 and the solid electrolyte layer 24 being damaged.

[0257] In some embodiments, the pressure of the isostatic pressing is 300 - 800 Mpa.

[0258] In this embodiment, the pressure of the isostatic pressing can take any one of the point values such as 350 Mpa, 400 Mpa, 450 Mpa, 500 Mpa, 550 Mpa, 600 Mpa, 650 Mpa, 700 Mpa, 750 Mpa, 800 Mpa or the range value between any two of them.

[0259] In some embodiments, the temperature of the isostatic pressing is 0 - 300 °C.

[0260] In this embodiment, the temperature of the isostatic pressing can take any one of the point values such as 0 °C, 20 °C, 50 °C, 80 °C, 100 °C, 120 °C, 150 °C, 200 °C, 250 °C, 280 °C, 300 °C or the range value between any two of them.

[0261] Controlling the temperature of the isostatic pressing treatment within the range of 0 - 300 °C makes it easier to bond the first electrode sheet 22 and the second electrode sheet 23 to the solid electrolyte layer 24 together.

[0262] In some embodiments, the temperature of the isostatic pressing treatment is 80 - 150 °C.

[0263] In this embodiment, the temperature of the isostatic pressing treatment can take any one of the point values such as 80 °C, 90 °C, 100 °C, 110 °C, 120 °C, 130 °C, 140 °C, 150 °C, etc. or the range value between any two of them.

[0264] In some embodiments, the duration of the isostatic pressing treatment is 1 - 100 min.

[0265] In this embodiment, the duration of the isostatic pressing treatment can take any one of the point values such as 1 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, 65 min, 70 min, 75 min, 80 min, 85 min, 90 min, 95 min, 100 min, etc. or the range value between any two of them.

[0266] In this embodiment, the duration of the isostatic pressing treatment is 1 - 100 min, which can improve the tightness of the bonding between the first electrode sheet 22 and the second electrode sheet 23 to the solid electrolyte layer 24.

[0267] In some embodiments, the duration of the isostatic pressing treatment is 10 - 80 min.

[0268] In this embodiment, the duration of the isostatic pressing treatment can take any one of the point values such as 10 min, 12 min, 15 min, 18 min, 20 min, 22 min, 25 min, 28 min, 30 min, 32 min, 35 min, 40 min, 42 min, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min, 60 min, 62 min, 65 min, 68 min, 70 min, 72 min, 75 min, 78 min, 80 min, etc. or the range value between any two of them.

[0269] In addition, please refer to Figures 4 - 6, an embodiment of the present application provides a battery cell 10, which includes a housing 1 and an electrode assembly 2. The electrode assembly 2 is accommodated in the housing 1, and the electrode assembly 2 is a laminated structure. The electrode assembly 2 includes a first electrode tab 22, a second electrode tab 23, a solid electrolyte layer 24, and an insulating member 25. The first electrode tab 22 is a positive electrode tab, and the second electrode tab 23 is a negative electrode tab. Along the first direction Z, at least a part of the solid electrolyte layer 24 is disposed between the first electrode tab 22 and the second electrode tab 23, and the second electrode tab 23 is disposed on both sides of the first electrode tab 22. The first electrode tab 22 includes a first active material region 221 and a first tab 222, and the first tab 222 protrudes from one end of the first active material region 221 along the second direction Y. The second electrode tab 23 includes a main body region 231 and an extending region 232 that extends beyond the first active material region 221. The main body region 231 and the first active material region 221 are stacked along the first direction Z. Along the second direction Y, extending regions 232 are disposed at both ends of the main body region 231. An insulating member 25 is disposed at an end of the first active material region 221 close to the extending region 232 along the second direction Y. Along the third direction X, extending regions 232 are also disposed at both ends of the main body region 231. An insulating member 25 is disposed at an end of the first active material region 221 close to the extending region 232 along the third direction X. The insulating member 25 is configured to insulate and isolate the extending region 232 and the first active material region 221. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs.

[0270] Please refer to Figures 9 - 11 , two insulating members 25 are disposed at both ends of the first active material region 221 along the second direction Y. The insulating member 25 includes a first insulating portion 251, a second insulating portion 252, and a third insulating portion 253 that are sequentially connected. Along the first direction Z, at least a part of the first insulating portion 251 is disposed between the first active material region 221 and the main body region 231, and at least a part of the third insulating portion 253 is disposed between the extending regions 232 of two adjacent second electrode tabs 23. Along the second direction Y, at least a part of the second insulating portion 252 is disposed between the first active material region 221 and the extending region 232. The third insulating portions 253 of the two insulating members 25 disposed at the same end of the first active material region 221 along the second direction Y are connected to each other. A part of the third insulating portions 253 of the two insulating members 25 disposed at the end of the first active material region 221 close to the first tab 222 along the second direction Y are respectively located on both sides of the first tab 222. The dimension of the first insulating portion 251 along the second direction Y is L1, and 0.1 mm ≤ L1 ≤ 10 mm. Along the second direction Y, the third insulating portion 253 extends beyond the end of the extending region 232 facing away from the main body region 231.

[0271] Please refer to Figure 15 and Figure 16, two insulating members 25 are provided at both ends of the first active material region 221 along the third direction X. The insulating member 25 includes a fourth insulating portion 254, a fifth insulating portion 255, and a sixth insulating portion 256 that are connected in sequence. Along the first direction Z, at least a part of the fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231, and at least a part of the sixth insulating portion 256 is disposed between the extended regions 232 of two adjacent second electrode plates 23. Along the third direction X, at least a part of the fifth insulating portion 255 is disposed between the first active material region 221 and the extended region 232. The sixth insulating portions 256 of the two insulating members 25 disposed at the same end of the first active material region 221 along the third direction X are connected to each other. The dimension of the fourth insulating portion 254 along the third direction X is L2, and 0.1 mm ≤ L2 ≤ 10 mm. Along the third direction X, the sixth insulating portion 256 extends beyond one end of the extended region 232 facing away from the main body region 231.

[0272] In such a battery cell 10, insulating members 25 are provided at both ends of the first active material region 221 along the second direction Y and both ends along the third direction X. The insulating member 25 can insulate and isolate the extended region 232 around the second electrode plate 23 from the first active material region 221 of the first electrode plate 22, reducing the risk of overlap between the extended region 232 and the first active material region 221, thereby reducing the risk of short circuit between the first electrode plate 22 and the second electrode plate 23 and improving the reliability of the battery cell 10.

[0273] Please refer to Figures 12 - 14, an embodiment of the present application provides a battery cell 10, which includes a housing 1 and an electrode assembly 2. The electrode assembly 2 is accommodated in the housing 1, and the electrode assembly 2 is a laminated structure. The electrode assembly 2 includes a first pole piece 22, a second pole piece 23, a solid electrolyte layer 24, and an insulating member 25. The first pole piece 22 is a positive electrode pole piece, and the second pole piece 23 is a negative electrode pole piece. Along the first direction Z, at least a part of the solid electrolyte layer 24 is disposed between the first pole piece 22 and the second pole piece 23, and the second pole piece 23 is disposed on both sides of the first pole piece 22. The first pole piece 22 includes a first active material region 221 and a first tab 222, and the first tab 222 protrudes from one end of the first active material region 221 along the second direction Y. The second pole piece 23 includes a main body region 231 and an extended region 232 that extends beyond the first active material region 221. The main body region 231 and the first active material region 221 are stacked along the first direction Z. Along the second direction Y, extended regions 232 are disposed at both ends of the main body region 231. An insulating member 25 is disposed at an end of the first active material region 221 close to the extended region 232 along the second direction Y. Along the third direction X, extended regions 232 are also disposed at both ends of the main body region 231. An insulating member 25 is disposed at an end of the first active material region 221 close to the extended region 232 along the third direction X. The insulating member 25 is configured to insulate and isolate the extended region 232 and the first active material region 221. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs.

[0274] Two insulating members 25 are disposed at both ends of the first active material region 221 close to the first tab 222 along the second direction Y. The insulating member 25 disposed at an end of the first active material region 221 close to the first tab 222 along the second direction Y includes a first insulating portion 251, a second insulating portion 252, and a third insulating portion 253 that are connected in sequence. Along the first direction Z, at least a part of the first insulating portion 251 is disposed between the first active material region 221 and the main body region 231, and at least a part of the third insulating portion 253 is disposed between the extended regions 232 of two adjacent second pole pieces 23. Along the second direction Y, at least a part of the second insulating portion 252 is disposed between the first active material region 221 and the extended region 232. The third insulating portions 253 of the two insulating members 25 disposed at both ends of the first active material region 221 close to the first tab 222 along the second direction Y are connected to each other, and a part of the third insulating portions 253 of the two insulating members 25 are respectively located on both sides of the first tab 222. The dimension of the first insulating portion 251 of the insulating member 25 disposed at an end of the first active material region 221 close to the first tab 222 along the second direction Y in the second direction Y is L1, and 0.1 mm ≤ L1 ≤ 10 mm. Along the second direction Y, the third insulating portion 253 of the insulating member 25 disposed at an end of the first active material region 221 close to the first tab 222 along the second direction Y extends beyond an end of the extended region 232 facing away from the main body region 231.

[0275] Please refer toFigure 13 A separator 25 is provided at each end of the first active material region 221 along the second direction Y away from the end of the first tab 222. The separator 25 includes a second insulating portion 252 and two first insulating portions 251, and the second insulating portion 252 connects the two first insulating portions 251. In the separator 25 provided at the end of the first active material region 221 along the second direction Y away from the first tab 222, the dimension of the first insulating portion 251 along the second direction Y is L1, where 0.1 mm ≤ L1 ≤ 10 mm. Along the first direction Z, at least a part of one first insulating portion 251 is disposed between the first active material region 221 and the main body region 231 of one second electrode plate 23, and at least a part of the other first insulating portion 251 is disposed between the first active material region 221 and the main body region 231 of the other second electrode plate 23. Along the second direction Y, at least a part of the second insulating portion 252 is disposed between the first active material region 221 and the extended region 232.

[0276] Please refer to Figure 17 and Figure 18 A separator 25 is provided at each of the two ends of the first active material region 221 along the third direction X. The separator 25 includes a fifth insulating portion 255 and two fourth insulating portions 254, and the fifth insulating portion 255 connects the two fourth insulating portions 254. In the separator 25 provided at the two ends of the first active material region 221 along the third direction X, the dimension of the fourth insulating portion 254 along the third direction X is L2, where 0.1 mm ≤ L2 ≤ 10 mm. Along the first direction Z, at least a part of one fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of one second electrode plate 23, and at least a part of the other fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of the other second electrode plate 23. Along the third direction X, at least a part of the fifth insulating portion 255 is disposed between the first active material region 221 and the extended region 232.

[0277] In such a battery cell 10, separators 25 are provided at the two ends of the first active material region 221 along the second direction Y and at the two ends along the third direction X. The separator 25 can insulate and isolate the extended region 232 around the second electrode plate 23 from the first active material region 221 of the first electrode plate 22, reducing the risk of overlap between the extended region 232 and the first active material region 221, thereby reducing the risk of short circuit between the first electrode plate 22 and the second electrode plate 23 and improving the reliability of the battery cell 10.

[0278] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0279] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: shell; An electrode assembly is contained in the housing, and the electrode assembly comprises: A first pole piece, comprising a first active material region and a first pole ear, wherein the first pole ear protrudes from the first active material region; A second pole piece, having a polarity opposite to that of the first pole piece, the second pole piece comprising a main body region and an exceeding region exceeding the first active material region, the main body region and the first active material region being stacked along a first direction; A solid electrolyte layer, along the first direction, at least a portion of the solid electrolyte layer is disposed between the first pole piece and the second pole piece; An insulating member is disposed in an edge region of the first active material region, and is configured to insulate and isolate the excess region from the first active material region.

2. The battery cell according to claim 1, characterized in that, Along the first direction, the first active material region has a first surface facing the main body region, at least part of the protruding region is located on a side of the first surface away from the main body region, and at least part of the insulating member is located between the protruding region and the first active material region.

3. The battery cell according to claim 1, characterized in that, The solid electrolyte layer comprises a first part and a second part, wherein the first part and the second part are staggered along the first direction, the first part is arranged between the main body region and the first active material region, and the second part is arranged in a stacked manner with the exceeding region; Along the first direction, the first active material region has a first surface facing the main body region, at least part of the second portion is located on a side of the first surface away from the main body region, and at least part of the insulating member is located between the second portion and the first active material region.

4. The battery cell according to claim 1, characterized in that, Along the first direction, at least a portion of the insulating member is located between the first active material region and the main body region.

5. The battery cell according to claim 4, wherein, Along the first direction, a portion of the insulating member located between the first active material region and the main body region is connected to a side of the first active material region facing the main body region.

6. The battery cell according to any one of claims 1-5, characterized in that, The exceeding region is disposed at at least one end of the main region along a second direction, and the insulating member is disposed at an end of the first active material region close to the exceeding region along the second direction, and the second direction is perpendicular to the first direction.

7. The battery cell according to claim 6, characterized in that, Along the first direction, the second pole pieces are arranged on both sides of the first pole piece; Two insulating members are provided at the end of the first active material region close to the exceeding region along the second direction, and the insulating member provided at at least one end of the first active material region along the second direction includes a first insulating portion, a second insulating portion and a third insulating portion connected in sequence; Along the first direction, at least part of the first insulating portion is arranged between the first active material area and the main body area, and at least part of the third insulating portion is arranged between the protruding areas of two adjacent second pole pieces; along the second direction, at least part of the second insulating portion is arranged between the first active material area and the protruding area.

8. The battery cell according to claim 7, wherein, Along the first direction, the first insulating portions of the two insulating members are respectively connected to two opposite sides of the first active material region.

9. The battery cell according to claim 7, wherein The third insulating portions of the two insulating members disposed at at least one end of the first active material region along the second direction are connected to each other.

10. The battery cell according to claim 7, wherein, Along the second direction, at least one end of the first active material region is provided with the first tab. In the insulating member disposed at the end of the first active material region along the second direction and close to the first tab, along the first direction, at least a part of the third insulating portion is located between the first tab and the extended region.

11. The battery cell according to claim 7, characterized in that, Along the second direction, the third insulating portion extends beyond one end of the extended region facing away from the main body region.

12. The battery cell according to claim 6, wherein, Along the first direction, the second tabs are provided on both sides of the first tab. The insulating member disposed at at least one end of the first active material region along the second direction includes a second insulating portion and two first insulating portions, and the second insulating portion connects the two first insulating portions. Along the first direction, at least a part of one first insulating portion is disposed between the first active material region and the main body region of one second tab, and at least a part of the other first insulating portion is disposed between the first active material region and the main body region of the other second tab; along the second direction, at least a part of the second insulating portion is disposed between the first active material region and the extended region.

13. The battery cell according to claim 12, wherein Along the first direction, the two first insulating portions are respectively connected to opposite sides of the first active material region.

14. The battery cell according to any one of claims 7-13, characterized in that, The dimension of the first insulating portion along the second direction is L1, and 0.1 mm ≤ L1 ≤ 10 mm; optionally, 2 mm ≤ L1 ≤ 8 mm.

15. The battery cell according to claim 6, characterized in that, Extended regions are provided at both opposite ends of the main body region along the second direction, and insulating members are provided at both opposite ends of the first active material region along the second direction.

16. The battery cell according to claim 6, wherein, An extended region is provided at at least one end of the main body region along the third direction, an insulating member is provided at the end of the first active material region along the third direction close to the extended region, and the first direction and the second direction are both perpendicular to the third direction.

17. The battery cell according to claim 16, characterized in that, Along the first direction, the second tabs are provided on both sides of the first tab. Two insulating members are provided at the end of the first active material region along the third direction close to the extended region, and the insulating member disposed at at least one end of the first active material region along the third direction includes a fourth insulating portion, a fifth insulating portion, and a sixth insulating portion that are connected in sequence. Along the first direction, at least a part of the fourth insulating portion is disposed between the first active material region and the main body region, and at least a part of the sixth insulating portion is disposed between the extended regions of two adjacent second tabs; along the third direction, at least a part of the fifth insulating portion is disposed between the first active material region and the extended region.

18. The battery cell according to claim 17, characterized in that, Along the first direction, the first active material region has two opposite first surfaces, and the fourth insulating portions of the two insulating members are respectively connected to opposite sides of the first active material region.

19. The battery cell according to claim 17, wherein, The sixth insulating portions of the two insulating members disposed at at least one end of the first active material region along the third direction are connected to each other.

20. The battery cell according to claim 17, wherein, Along the third direction, the sixth insulating portion extends beyond one end of the exceeding region away from the main body region.

21. The battery cell according to claim 16, characterized in that, Along the first direction, the second pole pieces are disposed on both sides of the first pole piece. The insulating member disposed at at least one end of the first active material region along the third direction includes a fifth insulating portion and two fourth insulating portions, and the fifth insulating portion connects the two fourth insulating portions. Along the first direction, at least a part of one of the fourth insulating portions is disposed between the first active material region and the main body region of one of the second pole pieces, and at least a part of the other fourth insulating portion is disposed between the first active material region and the main body region of the other second pole piece; along the third direction, at least a part of the fifth insulating portion is disposed between the first active material region and the exceeding region.

22. The battery cell according to claim 21, wherein, Along the first direction, the two fourth insulating portions are respectively connected to opposite sides of the first active material region.

23. The battery cell according to any one of claims 17-22, characterized in that, The dimension of the fourth insulating portion along the third direction is L2, where 0.1 mm ≤ L2 ≤ 10 mm; optionally, 2 mm ≤ L2 ≤ 8 mm.

24. The battery cell according to any one of claims 16-22, characterized in that, Exceeding regions are disposed at both opposite ends of the main body region along the third direction, and the insulating members are disposed at both opposite ends of the first active material region along the third direction.

25. The battery cell according to any one of claims 1-5, characterized in that, The first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

26. The battery cell according to any one of claims 1-5, characterized in that, The insulating member is a polymer material film layer.

27. The battery cell according to any one of claims 1-5, characterized in that, The insulating member includes at least one of polypropylene, polyolefin, ethylene vinyl acetate copolymer, epoxy resin glue, silicone rubber, polyurethane, and polyethylene terephthalate.

28. A battery device, characterized in that, Including the battery cell according to any one of claims 1-27.

29. An electrical device, characterized in that, Including the battery cell according to any one of claims 1-27 or the battery device according to claim 28, and the battery cell is used to provide electric energy.

30. An electrode assembly, characterized in that, Including: A first pole piece, including a first active material region and a first pole tab, and the first pole tab protrudes from the first active material region. A second pole piece, having a polarity opposite to that of the first pole piece, the second pole piece includes a main body region and an exceeding region exceeding the first active material region, and the main body region and the first active material region are stacked along the first direction. A solid electrolyte layer, along the first direction, at least a part of the solid electrolyte layer is disposed between the first pole piece and the second pole piece. An insulating member, disposed in the edge region of the first active material region, and the insulating member is configured to insulate and isolate the exceeding region and the first active material region.

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